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https://www.linkedin.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
6 PASS 3 REVIEW
B
DNS Records
2 A records, 31 ms lookup
REVIEW
2 A records, 31 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 172.64.146.215, 104.18.41.41
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:4407::ac40:92d7, 2a06:98c1:3102::6812:2929
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: cf-afd.www.linkedin.com
Info::
No NS records found
Info::
No MX records — email not configured via DNS
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 31 ms
Got: 31 ms
A172.64.146.215, 104.18.41.41
AAAA2606:4700:4407::ac40:92d7, 2a06:98c1:3102::6812:2929
CNAMEcf-afd.www.linkedin.com
NS—
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 31 ms

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

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.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

B
Crawlability
robots.txt present, no sitemap
REVIEW
robots.txt present, no sitemap
Info::
robots.txt is present
Got: 10240 bytes
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more ▾

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

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 LinkedInBot, Googlebot, Applebot, Bingbot, msnbot Blocking No — crawling allowed
# Notice: The use of robots or other automated means to access LinkedIn without
# the express permission of LinkedIn is strictly prohibited.
# See https://www.linkedin.com/legal/user-agreement.
# LinkedIn may, in its discretion, permit certain automated access to certain LinkedIn pages,
# for the limited purpose of including content in approved publicly available search engines.
# If you would like to apply for permission to crawl LinkedIn, please email whitelist-crawl@linkedin.com.
# Any and all permitted crawling of LinkedIn is subject to LinkedIn's Crawling Terms and Conditions.
# See http://www.linkedin.com/legal/crawling-terms.

User-agent: LinkedInBot
Allow: /

User-agent: Googlebot
Disallow: /addContacts*
Disallow: /addressBookExport*
Disallow: /ambry
Disallow: /analytics/
Disallow: /answers*
Disallow: /authwall
Disallow: /badges/profile/create
Disallow: /cap/
Disallow: /chat/
Disallow: /checkpoint/
Disallow: /companyDir*
Disallow: /connections*
Disallow: /csp/
Disallow: /e/
Disallow: /edurec*
Disallow: /embed/feed/update/
Disallow: /endorsements
Disallow: /feed/update/
Disallow: /find/
Disallow: /fizzy/admin
Disallow: /groups/
Disallow: /groupAnswers*
Disallow: /groupSharingMsg*
Disallow: /inviteFromProfile*
Disallow: /inviteMany*
Disallow: /jobs?runSearch*
Disallow: /jobs/view/externalApply/
Disallow: /jobs-guest/
Disallow: /api/jobPostings/jobs*
Disallow: /jsearch*
Disallow: /job-apply/
Disallow: /learning*?auth=true
Disallow: /learning*&auth=true
Disallow: /learning/articles/
Disallow: /learning/certificates/
Disallow: /learning/embed/
Disallow: /learning/events/
Disallow: /learning/instructors?
Disallow: /learning/instructors$
Disallow: /learning/instructors/
Disallow: /learning/login*?redirect=
Disallow: /learning/login*&redirect=
Disallow: /learning/me?
Disallow: /learning/me$
Disallow: /learning/me/
Disallow: /learning/memberbinding?
Disallow: /learning/memberbinding$
Disallow: /learning/memberbinding/
Disallow: /learning/search?
Disallow: /learning/search$
Disallow: /learning/search/
Disallow: /learning/settings?
Disallow: /learning/settings$
Disallow: /learning/settings/
Disallow: /lite/
Disallow: /li/track
Disallow: /mbox*
Disallow: /me/
Disallow: /memberInvite*
Disallow: /messaging/
Disallow: /mob/tracking
Disallow: /mwlite/
Disallow: /msgToConns*
Disallow: /myprofile*
Disallow: /network
Disallow: /newsArticle*
Disallow: /news?viewArticle*
Disallow: /nus-trk*
Disallow: /oauth/v2/*
Disallow: /oauth2/v2/*
Disallow: /organization-guest/
Disallow: /osview/
Disallow: /otherContacts
Disallow: /pages-extensions/FollowCompany*
Disallow: /people/iweReconnectAction
Disallow: /platform-telemetry/
Disallow: /ppl/
Disallow: /profile/
Disallow: /profile/view
Disallow: /psettings/
Disallow: /reconnect*
Disallow: /redirect*
Disallow: /redir*
Disallow: /requestList*
Disallow: /salary-explorer/api
Disallow: /search*
Disallow: /secure/
Disallow: /settings/
Disallow: /shareArticle*
Disallow: /signature*
Disallow: /slink*
Disallow: /start/
Disallow: /svpRecommendations*
Disallow: /topic/
Disallow: /title/
Disallow: /uas/login
Disallow: /uas/oauth/*
Disallow: /uas/oauth2/*
Disallow: /using*
Disallow: /voyager/api
Disallow: /help/*/ask
Disallow: /help/*/ask/*
Disallow: /help/*/answers
Disallow: /help/*/answers/*
Disallow: /help/testing
Disallow: /help/testing/*
Disallow: /xdoor*
Disallow: /comm/
Disallow: /enterprise-jobs/
Allow: /business/sales/blog*
Allow: /business/learning/blog*
Allow: /psettings/guest-controls*
Allow: /psettings/guest-email-unsubscribe*
Allow: /psettings/sms-unsubscribe*
Allow: /psettings/guest-controls/retargeting-opt-out*
Allow: /settings/loid-email-unsubscribe-router*
Allow: /settings/loid-email-unsubscribe*
Allow: /help/

User-agent: Applebot
Disallow: /addContacts*
Disallow: /addressBookExport*
Disallow: /ambry
Disallow: /analytics/
Disallow: /answers*
Disallow: /authwall
Disallow: /badges/profile/create
Disallow: /cap/
Disallow: /chat/
Disallow: /checkpoint/
Disallow: /companyDir*
Disallow: /connections*
Disallow: /csp/
Disallow: /e/
Disallow: /edurec*
Disallow: /endorsements
Disallow: /find/
Disallow: /fizzy/admin
Disallow: /groups/
Disallow: /groupAnswers*
Disallow: /groupSharingMsg*
Disallow: /inviteFromProfile*
Disallow: /inviteMany*
Disallow: /jobs?runSearch*
Disallow: /jobs/view/externalApply/
Disallow: /jobs-guest/
Disallow: /api/jobPostings/jobs*
Disallow: /jsearch*
Disallow: /job-apply/
Disallow: /learning*?auth=true
Disallow: /learning*&auth=true
Disallow: /learning/articles/
Disallow: /learning/embed/
Disallow: /learning/events/
Disallow: /learning/instructors?
Disallow: /learning/instructors$
Disallow: /learning/instructors/
Disallow: /learning/login*?redirect=
Disallow: /learning/login*&redirect=
Disallow: /learning/me?
Disallow: /learning/me$
Disallow: /learning/me/
Disallow: /learning/memberbinding?
Disallow: /learning/memberbinding$
Disallow: /learning/memberbinding/
Disallow: /learning/search?
Disallow: /learning/search$
Disallow: /learning/search/
Disallow: /learning/settings?
Disallow: /learning/settings$
Disallow: /learning/settings/
Disallow: /lite/
Disallow: /li/track
Disallow: /mbox*
Disallow: /me/
Disallow: /memberInvite*
Disallow: /messaging/
Disallow: /mob/tracking
Disallow: /mwlite/
Disallow: /msgToConns*
Disallow: /myprofile*
Disallow: /network
Disallow: /newsArticle*
Disallow: /news?viewArticle*
Disallow: /nus-trk*
Disallow: /oauth/v2/*
Disallow: /oauth2/v2/*
Disallow: /organization-guest/
Disallow: /osview/
Disallow: /otherContacts
Disallow: /people/iweReconnectAction
Disallow: /platform-telemetry/
Disallow: /ppl/
Disallow: /profile/
Disallow: /profile/view
Disallow: /psettings/
Disallow: /reconnect*
Disallow: /redirect*
Disallow: /redir*
Disallow: /requestList*
Disallow: /salary-explorer/api
Disallow: /search*
Disallow: /secure/
Disallow: /settings/
Disallow: /shareArticle*
Disallow: /signature*
Disallow: /slink*
Disallow: /start/
Disallow: /svpRecommendations*
Disallow: /topic/
Disallow: /title/
Disallow: /uas/login
Disallow: /uas/oauth/*
Disallow: /uas/oauth2/*
Disallow: /using*
Disallow: /voyager/api
Disallow: /help/*/ask
Disallow: /help/*/ask/*
Disallow: /help/*/answers
Disallow: /help/*/answers/*
Disallow: /help/testing
Disallow: /help/testing/*
Disallow: /xdoor*
Disallow: /comm/
Disallow: /enterprise-jobs/
Allow: /business/sales/blog*
Allow: /business/learning/blog*
Allow: /help/
Allow: /psettings/guest-controls*
Allow: /psettings/guest-email-unsubscribe*
Allow: /psettings/sms-unsubscribe*
Allow: /psettings/guest-controls/retargeting-opt-out*
Allow: /settings/loid-email-unsubscribe-router*
Allow: /settings/loid-email-unsubscribe*

User-agent: Bingbot
Disallow: /addContacts*
Disallow: /addressBookExport*
Disallow: /ambry
Disallow: /analytics/
Disallow: /answers*
Disallow: /authwall
Disallow: /badges/profile/create
Disallow: /cap/
Disallow: /chat/
Disallow: /checkpoint/
Disallow: /companyDir*
Disallow: /connections*
Disallow: /csp/
Disallow: /e/
Disallow: /edurec*
Disallow: /embed/feed/update/
Disallow: /endorsements
Disallow: /feed/update/
Disallow: /find/
Disallow: /fizzy/admin
Disallow: /groups/
Disallow: /groupAnswers*
Disallow: /groupSharingMsg*
Disallow: /inviteFromProfile*
Disallow: /inviteMany*
Disallow: /jobs?runSearch*
Disallow: /jobs/view/externalApply/
Disallow: /jobs-guest/
Disallow: /api/jobPostings/jobs*
Disallow: /jsearch*
Disallow: /job-apply/
Disallow: /learning*?auth=true
Disallow: /learning*&auth=true
Disallow: /learning/articles/
Disallow: /learning/certificates/
Disallow: /learning/embed/
Disallow: /learning/events/
Disallow: /learning/instructors?
Disallow: /learning/instructors$
Disallow: /learning/instructors/
Disallow: /learning/login*?redirect=
Disallow: /learning/login*&redirect=
Disallow: /learning/me?
Disallow: /learning/me$
Disallow: /learning/me/
Disallow: /learning/memberbinding?
Disallow: /learning/memberbinding$
Disallow: /learning/memberbinding/
Disallow: /learning/search?
Disallow: /learning/search$
Disallow: /learning/search/
Disallow: /learning/settings?
Disallow: /learning/settings$
Disallow: /learning/settings/
Disallow: /lite/
Disallow: /li/track
Disallow: /mbox*
Disallow: /me/
Disallow: /memberInvite*
Disallow: /messaging/
Disallow: /mob/tracking
Disallow: /mwlite/
Disallow: /msgToConns*
Disallow: /myprofile*
Disallow: /network
Disallow: /newsArticle*
Disallow: /news?viewArticle*
Disallow: /nus-trk*
Disallow: /oauth/v2/*
Disallow: /oauth2/v2/*
Disallow: /organization-guest/
Disallow: /osview/
Disallow: /otherContacts
Disallow: /pages-extensions/FollowCompany*
Disallow: /people/iweReconnectAction
Disallow: /platform-telemetry/
Disallow: /ppl/
Disallow: /profile/
Disallow: /profile/view
Disallow: /psettings/
Disallow: /reconnect*
Disallow: /redirect*
Disallow: /redir*
Disallow: /requestList*
Disallow: /salary-explorer/api
Disallow: /search*
Disallow: /secure/
Disallow: /settings/
Disallow: /shareArticle*
Disallow: /signature*
Disallow: /slink*
Disallow: /start/
Disallow: /svpRecommendations*
Disallow: /topic/
Disallow: /title/
Disallow: /uas/login
Disallow: /uas/oauth/*
Disallow: /uas/oauth2/*
Disallow: /using*
Disallow: /voyager/api
Disallow: /help/*/ask
Disallow: /help/*/ask/*
Disallow: /help/*/answers
Disallow: /help/*/answers/*
Disallow: /help/testing
Disallow: /help/testing/*
Disallow: /xdoor*
Disallow: /comm/
Disallow: /enterprise-jobs/
Allow: /business/sales/blog*
Allow: /business/learning/blog*
Allow: /help/
Allow: /psettings/guest-controls*
Allow: /psettings/guest-email-unsubscribe*
Allow: /psettings/sms-unsubscribe*
Allow: /psettings/guest-controls/retargeting-opt-out*
Allow: /settings/loid-email-unsubscribe-router*
Allow: /settings/loid-email-unsubscribe*

User-agent: msnbot
Disallow: /addContacts*
Disallow: /addressBookExport*
Disallow: /ambry
Disallow: /analytics/
Disallow: /answers*
Disallow: /authwall
Disallow: /badges/profile/create
Disallow: /cap/
Disallow: /chat/
Disallow: /checkpoint/
Disallow: /companyDir*
Disallow: /connections*
Disallow: /csp/
Disallow: /e/
Disallow: /edurec*
Disallow: /endorsements
Disallow: /find/
Disallow: /fizzy/admin
Disallow: /groups/
Disallow: /groupAnswers*
Disallow: /groupSharingMsg*
Disallow: /inviteFromProfile*
Disallow: /inviteMany*
Disallow: /jobs?runSearch*
Disallow: /jobs/view/externalApply/
D
sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

B
TLS Certificate Expiry & Recommendations
165 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

165
days left
0d 30d 60d 90d+

Recommended actions

  • 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
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://www.linkedin.com

https://www.linkedin.com

298 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://www.linkedin.com200298 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2606:4700:4407::ac40:92d7, 2a06:98c1:3102::6812:2929
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700:4407::ac40:92d7, 2a06:98c1:3102::6812:2929 Connection Reachable (17 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.linkedin.com/
301https://linkedin.com/

Preferred variant: www

HTTP → HTTPS

301http://www.linkedin.com/ → https://www.linkedin.com/hp

Consistent

A+
Domain Intelligence
linkedin.com — via MarkMonitor Inc., 23 years, 9 months old
PASS
linkedin.com — via MarkMonitor Inc., 23 years, 9 months old
Info::
Domain registered until Nov 2, 2026 (6 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: MarkMonitor Inc.
Domain expiry

139 days

November 2, 2026

SSL certificate

165 days

Issued by DigiCert Inc

Domain age

23 years, 9 months

Registered November 2, 2002

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2620:1ec:50::12

Registrar

MarkMonitor Inc.

Lock status unknown 8 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
Registrar MarkMonitor Inc.
Created November 2, 2002 (23 years, 9 months ago)
Expires November 2, 2026 (6 months)
Last Updated October 1, 2025
Name Servers dns1.p09.nsone.net, dns2.p09.nsone.net, dns3.p09.nsone.net, dns4.p09.nsone.net, ns1-42.azure-dns.com, ns2-42.azure-dns.net, ns3-42.azure-dns.org, ns4-42.azure-dns.info
DNSSEC Not enabled
Hosting
IP Address 2620:1ec:50::12
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

A+
HTTP Probe Timing
Total 280 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
1 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.
25 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
280 ms
Total Time Total request time from DNS lookup through full response.
281 ms

Connection waterfall

DNS Lookup 1 ms TCP Connect 16 ms TLS Handshake 25 ms Server Processing 238 ms Content Transfer 1 ms
A
CDN & Delivery
Cloudflare (DYNAMIC)
PASS
Cloudflare (DYNAMIC)
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: 9e8bb0627e9b6f2d-CDG
Info::
CDN cache status: DYNAMIC
CDN Detected: Cloudflare
Provider Cloudflare Cache Status DYNAMIC Evidence cf-ray: 9e8bb0627e9b6f2d-CDG
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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