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Https://www.facebook.com/61591775755857

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
6
PASS
9
INFO
0
Probed from Madrid, Spain
302 Found
Checks
17
9 PASS 6 REVIEW 2 FIX
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
DNS Records
1 A records, 42 ms lookup
REVIEW
1 A records, 42 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 157.240.202.35
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:f17b:187:face:b00c:0:25de
Warning::
CNAME record at zone apex
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
Got: star-mini.c10r.facebook.com
Info::
No NS records found
Info::
No MX records — email not configured via DNS
Info::
SPF record present in TXT
Info::
DNS resolution time: 42 ms
Got: 42 ms
A157.240.202.35
AAAA2a03:2880:f17b:187:face:b00c:0:25de
CNAMEstar-mini.c10r.facebook.com
NS—
MX—
TXT
SPF v=spf1 a ~all
CAALookup not available with standard resolver
Resolved in 42 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 CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Why this matters

CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.

Learn more ▾

RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.

Source: RFC 1034

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).
B
CAA Records
No CAA records (any CA may issue certificates)
REVIEW
No CAA records (any CA may issue certificates)
Info::
No CAA records published
Without CAA records, any publicly-trusted CA can issue certificates for this domain. Adding a CAA record (`yourdomain. IN CAA 0 issue "letsencrypt.org"`) restricts issuance to CAs you authorize. Required by CAB Forum baseline since 2017; the default of 'any CA' is widely supported but is the broader attack surface for issuance fraud.
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 YaK, PetalBot, uptimerobot, viberbot, DuckDuckBot, facebookexternalhit, Googlebot, Googlebot-Image, Yeti, Applebot, Bingbot, Scrapy, Yandex, Discordbot, 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: 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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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: /business/help/search*&query=
Disallow: /business/help/search*?query=
Disallow: /business/news*&tags
Disallow: /business/news*?tags
Disallow: /business/search*&q=
Disallow: /business/search*?q=
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/
Disallo
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
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+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
CNAME does not point at a known takeover-able service
A+
Reverse DNS
2/2 IPs match cert SAN
PASS
2/2 IPs match cert SAN
Info::
PTR for 157.240.202.35 matches certificate SAN: edge-star-mini-shv-02-cdg4.facebook.com
Info::
PTR for 2a03:2880:f17b:187:face:b00c:0:25de matches certificate SAN: edge-star-mini6-shv-02-cdg4.facebook.com
A+
Multi-Resolver DNS Speed
Mean 13ms across 3 resolvers (spread 22ms)
PASS
Mean 13ms across 3 resolvers (spread 22ms)
Info::
Quad9: 0ms
Got: 0ms via 9.9.9.9:53
Info::
Cloudflare: 17ms
Got: 17ms via 1.1.1.1:53
Info::
Google: 22ms
Got: 22ms via 8.8.8.8:53
A
Redirect Chain
1 redirect(s), 306 ms total
PASS
1 redirect(s), 306 ms total
Info::
Single redirect
Got: Https://www.facebook.com/61591775755857 → https://www.facebook.com/login/?next=https%3A%2F%2Fwww.facebook.com%2F61591775755857 (302)
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: Https://www.facebook.com/61591775755857

Https://www.facebook.com/61591775755857

151 ms · HTTP/1.1

302

https://www.facebook.com/login/?next=htt...

155 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1Https://www.facebook.com/61591775755857302151 msHTTP/1.1
2https://www.facebook.com/login/?next=htt...200155 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.

Learn more ▾

Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).

Source: Google Search Central

A+
IPv6 Readiness
IPv6 reachable (16 ms)
PASS
IPv6 reachable (16 ms)
Info::
IPv6 is configured and reachable at 2a03:2880:f17b:187:face:b00c:0:25de
Got: 16 ms connect
IPv6 Ready
AAAA Records 2a03:2880:f17b:187:face:b00c:0:25de Connection Reachable (16 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: www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.facebook.com/61591775755857
301https://facebook.com/61591775755857

Preferred variant: www

Trailing Slash

302https://www.facebook.com/61591775755857/
200Https://www.facebook.com/61591775755857

HTTP → HTTPS

301http://www.facebook.com/61591775755857 → https://www.facebook.com/61591775755857

Consistent

A+
Domain Intelligence
facebook.com — via RegistrarSafe, LLC, 29 years, 9 months old
PASS
facebook.com — via RegistrarSafe, LLC, 29 years, 9 months old
Info::
Domain registered until Mar 30, 2034 (7 years, 9 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

2782 days

March 30, 2034

SSL certificate

7 days

Issued by DigiCert Inc

Domain age

29 years, 9 months

Registered March 29, 1997

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2a03:2880:f17b:187: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 March 29, 1997 (29 years, 9 months ago)
Expires March 30, 2034 (7 years, 9 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 2a03:2880:f17b:187:face:b00c:0:25de
Data source: rdap (0.6s)

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 228 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
52 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
16 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
19 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
228 ms
Total Time Total request time from DNS lookup through full response.
228 ms

Connection waterfall

DNS Lookup 52 ms TCP Connect 16 ms TLS Handshake 19 ms Server Processing 141 ms Content Transfer 0 ms
A+
Health Check Endpoint
Health endpoint at https://www.facebook.com/health (HTTP 200)
PASS
Health endpoint at https://www.facebook.com/health (HTTP 200)
Info::
Public health endpoint at https://www.facebook.com/health
Got: https://www.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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