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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
89
GRADE
B
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from Amsterdam, Netherlands
202 HTTP 202
Checks
9
6 PASS 3 REVIEW
B
DNS Records
4 A records, 566 ms lookup
REVIEW
4 A records, 566 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 13.227.146.90, 13.227.146.114, 13.227.146.38, 13.227.146.124
Info::
No IPv6 (AAAA) records
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: d1of1hbywxxm65.cloudfront.net
Info::
4 nameserver(s) configured
Got: ns-1553.awsdns-02.co.uk, ns-198.awsdns-24.com, ns-941.awsdns-53.net, ns-1477.awsdns-56.org
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'.
Warning::
DNS resolution is slow (566 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 566 ms
A13.227.146.90, 13.227.146.114, 13.227.146.38, 13.227.146.124
AAAA—
CNAMEd1of1hbywxxm65.cloudfront.net
NSns-1553.awsdns-02.co.uk, ns-198.awsdns-24.com, ns-941.awsdns-53.net, ns-1477.awsdns-56.org
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 566 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

C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
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

B
TLS Certificate Expiry & Recommendations
209 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

209
days left
0d 30d 60d 90d+

Recommended actions

  • Submit your domain to hstspreload.org to be added to the Chrome preload list
  • 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.booking.com

https://www.booking.com

677 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://www.booking.com202677 msHTTP/1.1CloudFront
A+
Crawlability
robots.txt present, sitemap with 45 URLs
PASS
robots.txt present, sitemap with 45 URLs
Info::
robots.txt is present
Got: 10240 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 45 entries
Info::
Sitemap index with 45 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 10240 B Sitemaps referenced 121 User-agents Blocking No — crawling allowed
#       %%%%%%%%%%%%%%%%%%%%%%%%%%%%
#    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#  %%%%%%               %%%%%%%%%%%%%%%%%
#  %%%%%                 %%%%%%%%%%%%%%%%
#  %%%%%       %%%%%       %%%%%%%%%%%%%%
#  %%%%%      %%%%%%%%     %%%%%%%%%%%%%%         @@@@@@@@@@@       @@@@@@@@@@@@@@@        @@@@@@@@@
#  %%%%%      %%%%%%%      %%%%%%%%%%%%%%      @@@@@@@@@@@@@@@@@    @@@@@@@@@@@@@@@     @@@@@@@@@@@@@@@
#  %%%%%                 %%%%%%%%%%%%%%%%     @@@@@@@        @@@@   @@@@@             @@@@@@@     @@@@@@@
#  %%%%%                  %%%%%%%%%%%%%%%      @@@@@@@@             @@@@@@@@@@@@@@   @@@@@@@       @@@@@@@
#  %%%%%      %%%%%%%%      %%%%%%%%%%%%%        @@@@@@@@@@@@@      @@@@@@@@@@@@@@   @@@@@@         @@@@@@
#  %%%%%      %%%%%%%%%     %%%%%%%%%%%%%                @@@@@@@    @@@@@            @@@@@@@       @@@@@@@
#  %%%%%      %%%%%%%%      %%%     %%%%%     @@@@@@       @@@@@@   @@@@@             @@@@@@@     @@@@@@@
#  %%%%%                   %%%       %%%%      @@@@@@@@@@@@@@@@@    @@@@@@@@@@@@@@@    @@@@@@@@@@@@@@@@@
#  %%%%%                %%%%%%%     %%%%%        @@@@@@@@@@@@@      @@@@@@@@@@@@@@@       @@@@@@@@@@@
#  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#
#
#  It's our mission to make it easier for everyone to experience the world, even bots!
#
#  You know you could be getting paid to poke around in our code?
#  We're hiring Search Marketers, Copywriters, Developers and many other roles:
#  https://careers.booking.com/
#  Come join us!
#
#  #########################
#  Travel guide for crawlers
#  #########################
Sitemap: https://www.booking.com/sitembk-airport-index.xml
Sitemap: https://www.booking.com/sitembk-articles-index.xml
Sitemap: https://www.booking.com/sitembk-attractions-category-city-index.xml
Sitemap: https://www.booking.com/sitembk-attractions-city-index.xml
Sitemap: https://www.booking.com/sitembk-attractions-index.xml
Sitemap: https://www.booking.com/sitembk-attractions-point-of-interest-index.xml
Sitemap: https://www.booking.com/sitembk-attractions-subcategory-city-index.xml
Sitemap: https://www.booking.com/sitembk-beach-holidays-index.xml
Sitemap: https://www.booking.com/sitembk-beaches-index.xml
Sitemap: https://www.booking.com/sitembk-cars-airport-index.xml
Sitemap: https://www.booking.com/sitembk-cars-city-index.xml
Sitemap: https://www.booking.com/sitembk-cars-country-index.xml
Sitemap: https://www.booking.com/sitembk-cars-region-index.xml
Sitemap: https://www.booking.com/sitembk-cars-supplier-airport-index.xml
Sitemap: https://www.booking.com/sitembk-cars-supplier-city-index.xml
Sitemap: https://www.booking.com/sitembk-cars-supplier-country-index.xml
Sitemap: https://www.booking.com/sitembk-cars-supplier-index-index.xml
Sitemap: https://www.booking.com/sitembk-city-index.xml
Sitemap: https://www.booking.com/sitembk-country-index.xml
Sitemap: https://www.booking.com/sitembk-district-index.xml
Sitemap: https://www.booking.com/sitembk-editorial-articles-index.xml
Sitemap: https://www.booking.com/sitembk-extended-stays-index-index.xml
Sitemap: https://www.booking.com/sitembk-flights-city-to-city-index.xml
Sitemap: https://www.booking.com/sitembk-flights-city-to-country-index.xml
Sitemap: https://www.booking.com/sitembk-flights-country-index.xml
Sitemap: https://www.booking.com/sitembk-flights-index-index.xml
Sitemap: https://www.booking.com/sitembk-flights-to-airport-index.xml
Sitemap: https://www.booking.com/sitembk-flights-to-city-index.xml
Sitemap: https://www.booking.com/sitembk-flights-to-region-index.xml
Sitemap: https://www.booking.com/sitembk-fraud-index.xml
Sitemap: https://www.booking.com/sitembk-holidays-city-index.xml
Sitemap: https://www.booking.com/sitembk-hotel-index.xml
Sitemap: https://www.booking.com/sitembk-hotel-review-index.xml
Sitemap: https://www.booking.com/sitembk-landmark-index.xml
Sitemap: https://www.booking.com/sitembk-newly-opened-index.xml
Sitemap: https://www.booking.com/sitembk-product-guides-index.xml
Sitemap: https://www.booking.com/sitembk-region-index.xml
Sitemap: https://www.booking.com/sitembk-regiongroup-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-7days_inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-accessible_traveling-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-accommodation-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-alberghi-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-all_inclusive-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-apa-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-aparthotel-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-apartments-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-beach-rental-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-bed_and_breakfast-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-bestwestern-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-boats-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-booking-home-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-budget-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-bungalows-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-campsite-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-capsule_hotel-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-casino-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-chalet-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-condo-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-cottages-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-country_house-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-design-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-dormy_inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-families-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-farmhouses-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-fivestars-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-fourstars-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-gites-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-glamping-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-golf-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-gostinicy-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-guest_house-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-hanok-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-hanting_express-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-hilton-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-holidayhomes-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-holidayinn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-holidaypark-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-home_inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-home_stay-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-hostels-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-ibis-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-jacuzzi-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-lake_house-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-lodge-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-love_hotel-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-luxury-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-marriott-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-mercure-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-mgm-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-motels-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-nhhoteles-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-novotel-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-onsen-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-parking-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-pets-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-placestostay-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-ramada-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-resorts-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-riad-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-romance-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-rooms-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-route_inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-ryokans-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-self-catering-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-sheraton-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-ski-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-spa_hotels-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-strand-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-swimming_pool-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-tented_camp-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-threestars-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-tiny_house-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-toyoko_inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-city-villas-index.xml
Sitemap: https://www.booking.com/sitembk-themed-country-7days_inn-index.xml
Sitemap: https://www.booking.com/sitembk-themed-country-accessible_traveling-index.xml
Sitemap: https://www.booking.com/sitembk-themed-country-accommodation-index.xml
Sitemap: https://www.booking.com/sitembk-themed-country-alberghi-index.xml
Sitemap: https://www.booking.com/sitembk-themed-country-all_inclusive-index.xml
Sitemap: https://www.booking.com/sitembk-themed-country-apa-index.xml
Sitema
sitemap.xml 200 OK
Type Sitemap Index URLs 45 entries Valid XML Yes
Child Sitemaps:
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.booking.com/
301https://booking.com/

Preferred variant: www

HTTP → HTTPS

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

Consistent

A+
Domain Intelligence
booking.com — via MarkMonitor Inc., 28 years, 4 months old, hosted on AWS
PASS
booking.com — via MarkMonitor Inc., 28 years, 4 months old, hosted on AWS
Info::
Domain registered until Apr 16, 2027 (1 years 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.
Info::
Hosting: AWS
Got: AS16509
Domain expiry

242 days

April 16, 2027

SSL certificate

209 days

Issued by DigiCert Inc

Domain age

28 years, 4 months

Registered April 17, 1998

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

13.227.146.90

Registrar

MarkMonitor Inc.

Lock status unknown 4 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 April 17, 1998 (28 years, 4 months ago)
Expires April 16, 2027 (1 years)
Last Updated March 15, 2025
Name Servers ns-1288.awsdns-33.org, ns-1959.awsdns-52.co.uk, ns-508.awsdns-63.com, ns-716.awsdns-25.net
DNSSEC Not enabled
Hosting
IP Address 13.227.146.90
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (1.2s)

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

Connection waterfall

DNS Lookup 312 ms TCP Connect 21 ms TLS Handshake 24 ms Server Processing 66 ms Content Transfer 0 ms
A
CDN & Delivery
AWS CloudFront (Miss from cloudfront)
PASS
AWS CloudFront (Miss from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: WAW51-P5)
Got: x-amz-cf-id: n8aUaqMQ6ZqWpMKCdTdZcj7AFs1Q6tX4sqOCIbRXsusTNuBOcBgcXA==
Info::
CDN cache status: Miss from cloudfront
CDN Detected: AWS CloudFront
Provider AWS CloudFront Cache Status Miss from cloudfront Evidence x-amz-cf-id: n8aUaqMQ6ZqWpMKCdTdZcj7AFs1Q6tX4sqOCIbRXsusTNuBOcBgcXA==
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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