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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
1
PASS
6
INFO
0
Probed from Sao Paulo, Brazil
301 Moved Permanently
Checks
9
6 PASS 1 REVIEW 2 FIX
D
TLS Certificate Expiry & Recommendations
Action
8 days until leaf cert expires — 6 issues to address
FIX

Certificate validity

8
days left
0d 30d 60d 90d+
Renew urgently — under 14 days remaining

Recommended actions

  • Renew certificate — 8 days remaining
  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • 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.

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 Discordbot, Brightbot, Google-Extended, GPTBot, Scrapy, Bingbot, facebookexternalhit, Googlebot-Image, Google-InspectionTool, PetalBot, viberbot, YaK, Yeti, DuckDuckBot, Googlebot-News, Amazonbot, ClaudeBot, PerplexityBot, Yandex, Applebot, Googlebot, Googlebot-Video, Applebot-Extended, uptimerobot 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: /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: /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: /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: /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: /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: /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: /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: /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: /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: /*/plugins/*
Disallow: /?*next=
Disallow: /a/bz?
Disallow: /ajax/
Disallow: /album.php
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: /photo
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
A+
DNS Records
1 A records, 11 ms lookup
PASS
1 A records, 11 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 31.13.85.36
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:f148:181:face:b00c:0:25de
Info::
4 nameserver(s) configured
Got: a.ns.facebook.com, d.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com
Info::
2 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 11 ms
Got: 11 ms
A31.13.85.36
AAAA2a03:2880:f148:181:face:b00c:0:25de
CNAME—
NSa.ns.facebook.com, d.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com
MX
10 mxb-00082601.gslb.pphosted.com
10 mxa-00082601.gslb.pphosted.com
TXT
586957ce-d11e-4efa-9fe5-a887498bf838
SPF v=spf1 redirect=_spf.fb.com
google-site-verification=Dsycvk_Ky3uQjdvuPrI_Z6A98lWghNTntdS4LuATOj8
docusign=ad7f789d-eff1-4283-9d90-fdc9484527e1
MS=ms56927146
atlassian-domain-verification=I7HLjLnlhJiDT58wzrru2Pd/2cRWa3AKlgCjDPOO43GMP7H0Qu...
G3X1k1XGYGra1nUpTv7Rdk2wAEFHfkKIr9/4/6+Nu67Ks9cR8xaiqAZPPhis9lGD6mb/+9vygIr4QKXI...
parkable-domain-verification=N89SxXel0S4pUXDFVpckFmXIO9MUvN4Or0bO_Lcb8Os=
smartsheet-site-validation=sB5xgx-1nsnQCgORYUhnyDG3Jr739OxJ
mentimeter-16bdc82d-93be-47de-a6d4-fd6adb17c403
mentimeter-8599dcd1-e0da-4326-882e-7570e7c942fb
I2B7AuxY6G1G_NeiaHF-9A0zn-3NDBnlOBi4zItNCU8
smartsheet-site-validation=r-TtxwzdAh2KN_Zi6mTLGu02fz-9vQU4
CAALookup not available with standard resolver
Resolved in 11 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

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A
Redirect Chain
1 redirect(s), 375 ms total
PASS
1 redirect(s), 375 ms total
Info::
Single redirect
Got: https://fb.com → https://www.facebook.com/ (301)
Info::
WWW normalization redirect
Info::
Cross-domain redirect detected

https://fb.com

158 ms · HTTP/1.1

301

https://www.facebook.com/

217 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://fb.com301158 msHTTP/1.1
2https://www.facebook.com/200217 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2a03:2880:f148:181:face:b00c:0:25de
Got: 1 ms connect
IPv6 Ready
AAAA Records 2a03:2880:f148:181:face:b00c:0:25de Connection Reachable (1 ms)
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.fb.com/
200https://fb.com/

Preferred variant: non-www

HTTP → HTTPS

301http://fb.com/ → https://fb.com/

Consistent

A+
Domain Intelligence
fb.com — via RegistrarSafe, LLC, 36 years, 5 months old
PASS
fb.com — via RegistrarSafe, LLC, 36 years, 5 months old
Info::
Domain registered until May 23, 2034 (8 years, 2 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.
Domain expiry

2870 days

May 23, 2034

SSL certificate

8 days

Issued by DigiCert Inc

Domain age

36 years, 5 months

Registered May 22, 1990

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2a03:2880:f148:181:face:b00c:0:25de

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 May 22, 1990 (36 years, 5 months ago)
Expires May 23, 2034 (8 years, 2 months)
Last Updated May 28, 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 2a03:2880:f148:181:face:b00c:0:25de
Data source: rdap (0.4s)

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 157 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.
1 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.
157 ms
Total Time Total request time from DNS lookup through full response.
157 ms

Connection waterfall

DNS Lookup 4 ms TCP Connect 1 ms TLS Handshake 4 ms Server Processing 148 ms Content Transfer 0 ms
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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