Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Singapore, Singapore

200 OK

Checks

3 PASS 5 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

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.

DNS Records

9 A records, 5366 ms lookup

REVIEW

9 A records, 5366 ms lookup

Resolves to 9 IPv4 address(es)

Got: 23.32.20.48, 23.32.20.33, 23.32.20.74, 23.32.20.51, 23.32.20.35, 23.32.20.57, 23.32.20.40, 23.32.20.65, 23.32.20.56

No IPv6 (AAAA) records

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: e118243.a.akamaiedge.net

No NS records found

No MX records — email not configured via DNS

CAA records not checked

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

No SPF record found in TXT records

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

DNS resolution is slow (5366 ms)

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Got: 5366 ms

A	23.32.20.48, 23.32.20.33, 23.32.20.74, 23.32.20.51, 23.32.20.35, 23.32.20.57, 23.32.20.40, 23.32.20.65, 23.32.20.56
AAAA	—
CNAME	e118243.a.akamaiedge.net
NS	—
MX	—
TXT	—
CAA	Lookup not available with standard resolver

Resolved in 5366 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)

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

No IPv6 (AAAA) records found

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

No IPv6 Support

About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

Crawlability

robots.txt present, no sitemap

REVIEW

robots.txt present, no sitemap

robots.txt is present

Got: 10240 bytes

No sitemap.xml found

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

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 Bingbot, YandexBot, Baiduspider, OAI-Searchbot, Googlebot Blocking No — crawling allowed

#
#              ///////
#             //     //
#            //       //
#           //         //                           ///             ///                      ///
#          //           //                                          ///                      ///
#         //     ///     //               //// ///  ///  /// ////   /// ////     /// ////    /// ////
#        //   ///   ///   //            //////////  ///  ////////// ///////////  //////////  ///////////
#       //   //       //   //          ///     ///  ///  ///        ///      /// ///     /// ///      ///
#      //    //       //    //        ///      ///  ///  ///        ///      /// ///     /// ///      ///
#     //      //     //      //        ///     ///  ///  ///        ///     ///  ///     /// ///     ///
#    //        //   //        //        //////////  ///  ///        //////////   ///     /// //////////
#    //         /////         //
#    //         /////         //
#     //      ///   ///      //
#       //////         //////
#
#
#    Hello bot, engineer, or very lost layperson! Welcome to your stay on the Airbnb site, we're happy to have you as a guest.
#    If you're a human who likes solving interesting challenges with other humans, check out our careers page: https://careers.airbnb.com/positions/?_departments=engineering
#    If you're a bot who likes crawling webpages, please mind the house rules and avoid accessing any disallowed subfolders to earn a 5-star review from us.
#    Either way, thanks for stopping by! There's no need to collect your garbage at the end of your stay - we use Javascript for that.
#    See you on the next crawl!

User-agent: Googlebot
Allow: /calendar/ical/
Allow: /.well-known/amphtml/apikey.pub
Disallow: /.well-known/assetlinks.json
Disallow: /*/skeleton
Disallow: /*/sw_skeleton
Disallow: /500
Disallow: /account
Disallow: /alumni
Disallow: /api/v1/trebuchet
Disallow: /associates/click
Disallow: /book/
Disallow: /calendar/
Disallow: /contact_host
Disallow: /disaster/lookup
Disallow: /email/unsubscribe
Disallow: /embeddable
Disallow: /experiences/*?*scheduled_id
Disallow: /experiences/*?*modal
Disallow: /experiences/*/book
Disallow: /external_link?
Disallow: /fix-it
Disallow: /fixit
Disallow: /forgot_password
Disallow: /google_place_photo
Disallow: /api/v2/google_place_photos
Disallow: /groups
Disallow: /guidebooks
Disallow: /help/feedback
Disallow: /help/search
Disallow: /help/search
Disallow: /home/dashboard
Disallow: /inbox
Disallow: /login_with_redirect
Disallow: /logout
Disallow: /manage-listing
Disallow: /messaging/ajax_already_messaged/
Disallow: /my_listings
Disallow: /oauth_connect
Disallow: /payments/book
Disallow: /reservation
Disallow: /rooms/*/amenities
Disallow: /rooms/*/enhanced-cleaning
Disallow: /rooms/*/house-rules
Disallow: /rooms/*/location
Disallow: /rooms/*/photos
Disallow: /rooms/*/reviews
Disallow: /rooms/*/safety
Disallow: /rooms/*?viralityEntryPoint
Disallow: /rooms/*/cancellation-policy
Disallow: /rooms/*/description
Disallow: /s/guidebooks
Disallow: /signed_out_modal.json
Disallow: /signup_modal
Disallow: /stories
Disallow: /trips/upcoming
Disallow: /trips/v1/
Disallow: /update-your-browser
Disallow: /users/*/listings
Disallow: /users/show
Disallow: /users/profile
Disallow: /api/v3/LandingPageStaysQuery
Disallow: /s/*?
Disallow: /s/*/homes
Disallow: /things-to-do/places

User-agent: Bingbot
Allow: /calendar/ical/
Allow: /.well-known/amphtml/apikey.pub
Disallow: /.well-known/assetlinks.json
Disallow: /*/skeleton
Disallow: /*/sw_skeleton
Disallow: /500
Disallow: /account
Disallow: /alumni
Disallow: /api/v1/trebuchet
Disallow: /associates/click
Disallow: /book/
Disallow: /calendar/
Disallow: /contact_host
Disallow: /disaster/lookup
Disallow: /email/unsubscribe
Disallow: /embeddable
Disallow: /experiences/*?*scheduled_id
Disallow: /experiences/*?*modal
Disallow: /experiences/*/book
Disallow: /external_link?
Disallow: /fix-it
Disallow: /fixit
Disallow: /forgot_password
Disallow: /google_place_photo
Disallow: /api/v2/google_place_photos
Disallow: /groups
Disallow: /guidebooks
Disallow: /help/feedback
Disallow: /help/search
Disallow: /help/search
Disallow: /home/dashboard
Disallow: /inbox
Disallow: /login_with_redirect
Disallow: /logout
Disallow: /manage-listing
Disallow: /messaging/ajax_already_messaged/
Disallow: /my_listings
Disallow: /oauth_connect
Disallow: /payments/book
Disallow: /reservation
Disallow: /rooms/*/amenities
Disallow: /rooms/*/enhanced-cleaning
Disallow: /rooms/*/house-rules
Disallow: /rooms/*/location
Disallow: /rooms/*/photos
Disallow: /rooms/*/reviews
Disallow: /rooms/*/safety
Disallow: /rooms/*?viralityEntryPoint
Disallow: /rooms/*/cancellation-policy
Disallow: /rooms/*/description
Disallow: /s/guidebooks
Disallow: /signed_out_modal.json
Disallow: /signup_modal
Disallow: /stories
Disallow: /trips/upcoming
Disallow: /trips/v1/
Disallow: /update-your-browser
Disallow: /users/*/listings
Disallow: /users/show
Disallow: /users/profile
Disallow: /api/v3/LandingPageStaysQuery
Disallow: /s/*?
Disallow: /s/*/homes
Disallow: /things-to-do/places

User-agent: YandexBot
Allow: /calendar/ical/
Allow: /.well-known/amphtml/apikey.pub
Disallow: /.well-known/assetlinks.json
Disallow: /*/skeleton
Disallow: /*/sw_skeleton
Disallow: /500
Disallow: /account
Disallow: /alumni
Disallow: /api/v1/trebuchet
Disallow: /associates/click
Disallow: /book/
Disallow: /calendar/
Disallow: /contact_host
Disallow: /disaster/lookup
Disallow: /email/unsubscribe
Disallow: /embeddable
Disallow: /experiences/*?*scheduled_id
Disallow: /experiences/*?*modal
Disallow: /experiences/*/book
Disallow: /external_link?
Disallow: /fix-it
Disallow: /fixit
Disallow: /forgot_password
Disallow: /google_place_photo
Disallow: /api/v2/google_place_photos
Disallow: /groups
Disallow: /guidebooks
Disallow: /help/feedback
Disallow: /help/search
Disallow: /help/search
Disallow: /home/dashboard
Disallow: /inbox
Disallow: /login_with_redirect
Disallow: /logout
Disallow: /manage-listing
Disallow: /messaging/ajax_already_messaged/
Disallow: /my_listings
Disallow: /oauth_connect
Disallow: /payments/book
Disallow: /reservation
Disallow: /rooms/*/amenities
Disallow: /rooms/*/enhanced-cleaning
Disallow: /rooms/*/house-rules
Disallow: /rooms/*/location
Disallow: /rooms/*/photos
Disallow: /rooms/*/reviews
Disallow: /rooms/*/safety
Disallow: /rooms/*?viralityEntryPoint
Disallow: /rooms/*/cancellation-policy
Disallow: /rooms/*/description
Disallow: /s/guidebooks
Disallow: /signed_out_modal.json
Disallow: /signup_modal
Disallow: /stories
Disallow: /trips/upcoming
Disallow: /trips/v1/
Disallow: /update-your-browser
Disallow: /users/*/listings
Disallow: /users/show
Disallow: /users/profile
Disallow: /api/v3/LandingPageStaysQuery
Disallow: /s/*?
Disallow: /s/*/homes
Disallow: /things-to-do/places

User-agent: Baiduspider
Allow: /calendar/ical/
Allow: /.well-known/amphtml/apikey.pub
Disallow: /.well-known/assetlinks.json
Disallow: /*/skeleton
Disallow: /*/sw_skeleton
Disallow: /500
Disallow: /account
Disallow: /alumni
Disallow: /api/v1/trebuchet
Disallow: /associates/click
Disallow: /book/
Disallow: /calendar/
Disallow: /contact_host
Disallow: /disaster/lookup
Disallow: /email/unsubscribe
Disallow: /embeddable
Disallow: /experiences/*?*scheduled_id
Disallow: /experiences/*?*modal
Disallow: /experiences/*/book
Disallow: /external_link?
Disallow: /fix-it
Disallow: /fixit
Disallow: /forgot_password
Disallow: /google_place_photo
Disallow: /api/v2/google_place_photos
Disallow: /groups
Disallow: /guidebooks
Disallow: /help/feedback
Disallow: /help/search
Disallow: /help/search
Disallow: /home/dashboard
Disallow: /inbox
Disallow: /login_with_redirect
Disallow: /logout
Disallow: /manage-listing
Disallow: /messaging/ajax_already_messaged/
Disallow: /my_listings
Disallow: /oauth_connect
Disallow: /payments/book
Disallow: /reservation
Disallow: /rooms/*/amenities
Disallow: /rooms/*/enhanced-cleaning
Disallow: /rooms/*/house-rules
Disallow: /rooms/*/location
Disallow: /rooms/*/photos
Disallow: /rooms/*/reviews
Disallow: /rooms/*/safety
Disallow: /rooms/*?viralityEntryPoint
Disallow: /rooms/*/cancellation-policy
Disallow: /rooms/*/description
Disallow: /s/guidebooks
Disallow: /signed_out_modal.json
Disallow: /signup_modal
Disallow: /stories
Disallow: /trips/upcoming
Disallow: /trips/v1/
Disallow: /update-your-browser
Disallow: /users/*/listings
Disallow: /users/show
Disallow: /users/profile
Disallow: /api/v3/LandingPageStaysQuery
Disallow: /s/*?
Disallow: /s/*/homes
Disallow: /things-to-do/places

User-agent: OAI-Searchbot
Allow: /calendar/ical/
Allow: /.well-known/amphtml/apikey.pub
Disallow: /.well-known/assetlinks.json
Disallow: /*/skeleton
Disallow: /*/sw_skeleton
Disallow: /500
Disallow: /account
Disallow: /alumni
Disallow: /api/v1/trebuchet
Disallow: /associates/click
Disallow: /book/
Disallow: /calendar/
Disallow: /contact_host
Disallow: /disaster/lookup
Disallow: /email/unsubscribe
Disallow: /embeddable
Disallow: /experiences/*?*scheduled_id
Disallow: /experiences/*?*modal
Disallow: /experiences/*/book
Disallow: /external_link?
Disallow: /fix-it
Disallow: /fixit
Disallow: /forgot_password
Disallow: /google_place_photo
Disallow: /api/v2/google_place_photos
Disallow: /groups
Disallow: /guidebooks
Disallow: /help/feedback
Disallow: /help/search
Disallow: /help/search
Disallow: /home/dashboard
Disallow: /inbox
Disallow: /login_with_redirect
Disallow: /logout
Disallow: /manage-listing
Disallow: /messaging/ajax_already_messaged/
Disallow: /my_listings
Disallow: /oauth_connect
Disallow: /payments/book
Disallow: /reservation
Disallow: /rooms/*/amenities
Disallow: /rooms/*/enhanced-cleaning
Disallow: /rooms/*/house-rules
Disallow: /rooms/*/location
Disallow: /rooms/*/photos
Disallow: /rooms/*/reviews
Disallow: /rooms/*/safety
Disallow: /rooms/*?viralityEntryPoint
Disallow: /rooms/*/cancellation-policy
Disallow: /rooms/*/description
Disallow: /s/guidebooks
Disallow: /signed_out_modal.json
Disallow: /signup_modal
Disallow: /stories
Disallow: /trips/upcoming
Disallow: /trips/v1/
Disallow: /update-your-browser
Disallow: /users/*/listings
Disallow: /users/show
Disallow: /users/profile
Disallow: /api/v3/LandingPageStaysQuery
Disallow: /s/*?
Disallow: /s/*/homes
Disallow: /things-to-do/

sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

HTTP Probe Timing

Total 1179 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

REVIEW

DNS Lookup

247 ms

TCP Connect

44 ms

TLS Handshake

49 ms

Time to First Byte

701 ms

Total Time

1.18 s

Connection waterfall

DNS Lookup 247 ms TCP Connect 44 ms TLS Handshake 49 ms Server Processing 360 ms Content Transfer 479 ms

TLS Certificate Expiry & Recommendations

297 days until leaf cert expires — 4 issues to address

REVIEW

Certificate validity

297

days left

0d 30d 60d 90d+

Recommended actions

Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
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 redirect data available

PASS

No redirect data available

No redirect data captured

A+

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

PASS

www/non-www, trailing slash, HTTP→HTTPS

www/non-www redirect configured correctly (preferred: www)

HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.airbnb.com/

301https://airbnb.com/

Preferred variant: www

HTTP → HTTPS

301http://www.airbnb.com/ → https://www.airbnb.com/

Consistent

A+

Domain Intelligence

airbnb.com — via MarkMonitor Inc., 17 years, 11 months old, hosted on AWS

PASS

airbnb.com — via MarkMonitor Inc., 17 years, 11 months old, hosted on AWS

Domain registered until Aug 5, 2026 (4 months remaining)

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.

Registrar: MarkMonitor Inc.

Hosting: AWS

Got: AS16509

Domain expiry

53 days

August 5, 2026

SSL certificate

297 days

Issued by DigiCert Inc

Domain age

17 years, 11 months

Registered August 5, 2008

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

166.117.27.62

Registrar

MarkMonitor Inc.

Lock status unknown 8 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Renew the domain or enable auto-renewal to prevent accidental expiry
Enable DNSSEC to protect visitors from DNS spoofing

Registrar MarkMonitor Inc.

Created August 5, 2008 (17 years, 11 months ago)

Expires August 5, 2026 (4 months)

Last Updated October 11, 2024

Name Servers dns1.p08.nsone.net, dns2.p08.nsone.net, dns3.p08.nsone.net, dns4.p08.nsone.net, ns-1453.awsdns-53.org, ns-1932.awsdns-49.co.uk, ns-474.awsdns-59.com, ns-558.awsdns-05.net

DNSSEC Not enabled

Hosting

IP Address 166.117.27.62

ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)

Provider AWS

Data source: rdap (1.4s)

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

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.