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Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
5
PASS
9
INFO
0
Probed from Santa Clara, United States
301 Moved Permanently
Checks
17
9 PASS 5 REVIEW 3 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2a03:2880:f36e:1:face:b00c:0:25de
Info::
IPv6 connection error
Got: dial tcp6 [2a03:2880:f36e:1:face:b00c:0:25de]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2a03:2880:f36e:1:face:b00c:0:25de Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

D
TLS Certificate Expiry & Recommendations
Action
7 days until leaf cert expires — 5 issues to address
FIX

Certificate validity

7
days left
0d 30d 60d 90d+
Renew urgently — under 14 days remaining

Recommended actions

  • Renew certificate — 7 days remaining
  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • Add includeSubDomains to the HSTS directive
  • Enable DNSSEC on your domain for DNS spoofing protection
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

B
DNSSEC
Unsigned (DNSSEC not deployed)
REVIEW
Unsigned (DNSSEC not deployed)
Info::
DNSSEC is not deployed
The zone is not DNSSEC-signed. Users on validating resolvers (Cloudflare 1.1.1.1, Quad9 9.9.9.9, growing default in mobile resolvers) get no protection against DNS spoofing for this domain. Most registrars now offer DNSSEC at a single click; consider enabling it for sites where authenticity matters (banking, healthcare, government).
C
Crawlability
Action
robots.txt present, sitemap with 0 URLs
REVIEW
robots.txt present, sitemap with 0 URLs
Info::
robots.txt is present
Got: 10240 bytes
Info::
sitemap.xml is present
Warning::
sitemap.xml contains invalid XML
Search engines may not be able to parse the sitemap. Fix XML validation errors.
Warning::
sitemap.xml is empty — no URLs found
An empty sitemap provides no value. Add <url> entries for your pages.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Search engines may not be able to parse the sitemap. Fix XML validation errors.

Why this matters

An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.

Learn more ▾

Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.

Source: sitemaps.org / Google Search Central

An empty sitemap provides no value. Add <url> entries for your pages.

Why this matters

An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.

Learn more ▾

Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.

Source: Google Search Central / sitemaps.org

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 10240 B Sitemaps referenced 0 User-agents ClaudeBot, Google-Extended, GPTBot, Scrapy, uptimerobot, viberbot, Yandex, Applebot, PerplexityBot, Discordbot, DuckDuckBot, facebookexternalhit, Googlebot, Googlebot-Image, Applebot-Extended, PetalBot, Yeti, Googlebot-News, Google-InspectionTool, Amazonbot, Brightbot, YaK, Bingbot, Googlebot-Video Blocking No — crawling allowed
# Notice: Collection of data on Facebook through automated means is
# prohibited unless you have express written permission from Facebook
# and may only be conducted for the limited purpose contained in said
# permission.
# All authorized user-agents listed on this page must comply with Meta’s
# Automated Data Collection Terms available at:
# https://www.facebook.com/legal/automated_data_collection_terms
User-agent: Amazonbot
Disallow: /

User-agent: Applebot-Extended
Disallow: /

User-agent: Brightbot
Disallow: /

User-agent: ClaudeBot
Disallow: /

User-agent: Google-Extended
Disallow: /

User-agent: GPTBot
Disallow: /

User-agent: PerplexityBot
Disallow: /

User-agent: PetalBot
Disallow: /

User-agent: Scrapy
Disallow: /

User-agent: uptimerobot
Disallow: /

User-agent: viberbot
Disallow: /

User-agent: YaK
Disallow: /

User-agent: Yandex
Disallow: /

User-agent: Yeti
Disallow: /

User-agent: Applebot
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Bingbot
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Discordbot
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: DuckDuckBot
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: facebookexternalhit
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Googlebot
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Googlebot-Image
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /map_tile.php
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /static_map.php
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Googlebot-Video
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Googlebot-News
Disallow: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
Disallow: /business/*&categories
Disallow: /business/*?categories
Disallow: /checkpoint/
Disallow: /contact_importer/
Disallow: /dialog/
Disallow: /fbml/ajax/dialog/
Disallow: /feeds/
Disallow: /file_download.php
Disallow: /job_application/
Disallow: /l.php
Disallow: /login.php*&next=
Disallow: /login.php/?next=
Disallow: /login.php?next=
Disallow: /login/*&next=
Disallow: /login/?next=
Disallow: /login/device-based/regular/login/*&next=
Disallow: /login/device-based/regular/login/?next=
Disallow: /meta-ai-answers/
Disallow: /moments_app/
Disallow: /p.php
Disallow: /photos.php
Disallow: /plugins/
Disallow: /share.php
Disallow: /share/
Disallow: /sharer.php
Disallow: /sharer/
Disallow: /tr/
Disallow: /tr?
Disallow: /ufi/reaction/profile/browser/
Disallow: /x/oauth/
Allow: /ajax/bootloader-endpoint/
Allow: /ajax/pagelet/generic.php/PagePostsSectionPagelet
Allow: /careers/
Allow: /safetycheck/

User-agent: Google-InspectionTool
Disallow: /*/pl
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.facebook.com/
200https://facebook.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://facebook.com/ → https://facebook.com/

Consistent

B
CDN Cache Observability
No CDN cache-status headers in the response
REVIEW
No CDN cache-status headers in the response
Info::
No CDN cache-status headers in the response
Without an X-Cache / CF-Cache-Status / X-Vercel-Cache / Age header, you can't tell from outside whether a request hit the cache or went to origin. Operationally important: enables debugging stale-content reports and verifying cache rules. Most managed CDN platforms emit at least one of these by default; absence often means the platform's diagnostic headers are stripped at an upstream proxy.
B
Operational Status Page
No status page link detected
REVIEW
No status page link detected
Info::
No operational status page link detected
Status pages communicate planned maintenance and incidents to users -- a hallmark of operationally-mature services. Most SaaS teams publish one via Atlassian Statuspage, Instatus, BetterUptime, or a self-hosted Cachet. Smaller sites legitimately don't need one; flagged as Info, not a failure.
A+
DNS Records
1 A records, 7 ms lookup
PASS
1 A records, 7 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 157.240.22.35
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 2a03:2880:f36e:1:face:b00c:0:25de
Info::
4 nameserver(s) configured
Got: c.ns.facebook.com, b.ns.facebook.com, d.ns.facebook.com, a.ns.facebook.com
Info::
1 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 7 ms
Got: 7 ms
A157.240.22.35
AAAA2a03:2880:f36e:1:face:b00c:0:25de
CNAME—
NSc.ns.facebook.com, b.ns.facebook.com, d.ns.facebook.com, a.ns.facebook.com
MX
10 smtpin.vvv.facebook.com
TXT
SPF v=spf1 redirect=_spf.facebook.com
google-site-verification=wdH5DTJTc9AYNwVunSVFeK0hYDGUIEOGb-RReU6pJlY
google-site-verification=A2WZWCNQHrGV_TWwKh6KHY90tY0SHZo_RnyMJoDaG0s
zoom-domain-verification=4b2ef4e1-6dee-4483-9869-9bef353fd147
google-site-verification=sK6uY9x7eaMoEMfn3OILqwTFYgaNp4llmguKI-C3_iA
facebook-domain-verification=y7isfmi3kzyg1r4wophh9vyb6pgbda
CAALookup not available with standard resolver
Resolved in 7 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A
CAA Records
issue: digicert.com
PASS
issue: digicert.com
Info::
CAA issue tag present — authorized CA(s): digicert.com
Info::
No CAA iodef tag — won't be notified of failed issuance attempts
Add `0 iodef "mailto:security@example.com"` to receive notifications when a CA refuses issuance because it doesn't match your CAA policy. Useful signal for detecting issuance attempts by unauthorized CAs.
A+
Reverse DNS
2/2 IPs match cert SAN
PASS
2/2 IPs match cert SAN
Info::
PTR for 157.240.22.35 matches certificate SAN: edge-star-mini-shv-01-sjc3.facebook.com
Info::
PTR for 2a03:2880:f36e:1:face:b00c:0:25de matches certificate SAN: edge-star-mini6-shv-01-sjc6.facebook.com
A+
Multi-Resolver DNS Speed
Mean 6ms across 3 resolvers (spread 10ms)
PASS
Mean 6ms across 3 resolvers (spread 10ms)
Info::
Quad9: 2ms
Got: 2ms via 9.9.9.9:53
Info::
Cloudflare: 4ms
Got: 4ms via 1.1.1.1:53
Info::
Google: 12ms
Got: 12ms via 8.8.8.8:53
A
Redirect Chain
1 redirect(s), 184 ms total
PASS
1 redirect(s), 184 ms total
Info::
Single redirect
Got: https://facebook.com → https://www.facebook.com/ (301)
Info::
WWW normalization redirect

https://facebook.com

66 ms · HTTP/1.1

301

https://www.facebook.com/

117 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://facebook.com30166 msHTTP/1.1
2https://www.facebook.com/200117 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Domain Intelligence
facebook.com — via RegistrarSafe, LLC, 29 years, 8 months old, hosted on FACEBOOK - Facebook, Inc., US
PASS
facebook.com — via RegistrarSafe, LLC, 29 years, 8 months old, hosted on FACEBOOK - Facebook, Inc., US
Info::
Domain registered until Mar 30, 2034 (7 years, 10 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: RegistrarSafe, LLC
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Info::
Hosting: FACEBOOK - Facebook, Inc., US
Got: AS32934
Domain expiry

2818 days

March 30, 2034

SSL certificate

7 days

Issued by DigiCert Inc

Domain age

29 years, 8 months

Registered March 29, 1997

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

FACEBOOK - Facebook, Inc., US

ASN AS32934

157.240.22.35

Registrar

RegistrarSafe, LLC

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the TLS certificate or verify auto-renewal is working
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar RegistrarSafe, LLC
Created March 29, 1997 (29 years, 8 months ago)
Expires March 30, 2034 (7 years, 10 months)
Last Updated April 23, 2025
Name Servers a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.com
DNSSEC Not enabled
Hosting
IP Address 157.240.22.35
ASN AS32934 (FACEBOOK - Facebook, Inc., US)
Provider FACEBOOK - Facebook, Inc., US
Data source: rdap (0.1s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 76 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
4 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
2 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
4 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
77 ms
Total Time Total request time from DNS lookup through full response.
77 ms

Connection waterfall

DNS Lookup 4 ms TCP Connect 2 ms TLS Handshake 4 ms Server Processing 68 ms Content Transfer 0 ms
A+
Health Check Endpoint
Health endpoint at https://facebook.com/health (HTTP 200)
PASS
Health endpoint at https://facebook.com/health (HTTP 200)
Info::
Public health endpoint at https://facebook.com/health
Got: https://facebook.com/health
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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