kayak.com

Checked 22 October 2026, 09:31 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · 101domain GRS Limited · expires 2027-05-02

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
101domain GRS Limited
Registered
13 April 1995
Last changed
31 January 2025
Expires
2 May 2027
Status
client delete prohibited, client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-05-02 #3
    The registration is valid until 2027-05-02 (191 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org
NS in the zone
blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org
NameserverAddressesNetwork (AS)Glue
blue.foundationdns.com162.159.60.1 108.162.198.1 172.64.40.1 2606:4700:57::6ca2:c601 2803:f800:52::a29f:3c01 2a06:98c1:56::ac40:2801AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.198.1 162.159.60.1 172.64.40.1 2606:4700:57::6ca2:c601 2803:f800:52::a29f:3c01 2a06:98c1:56::ac40:2801
blue.foundationdns.net108.162.198.31 172.64.40.31 162.159.60.31 2803:f800:52::a29f:3c1f 2606:4700:57::6ca2:c61f 2a06:98c1:56::ac40:281fAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-
blue.foundationdns.org108.162.198.61 172.64.40.61 162.159.60.61 2606:4700:57::6ca2:c63d 2a06:98c1:56::ac40:283d 2803:f800:52::a29f:3c3dAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-

Checks

  • ✓ 3 nameservers #6
    Delegated to blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 3 IPv4 /24s and 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 18 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .com, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

18 of 18 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
blue.foundationdns.com 162.159.60.1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.com 108.162.198.1NOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.com 172.64.40.1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.com 2606:4700:57::6ca2:c601NOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.com 2803:f800:52::a29f:3c01NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.com 2a06:98c1:56::ac40:2801NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.net 108.162.198.31NOERROR, 10 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.net 172.64.40.31NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.net 162.159.60.31NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.net 2803:f800:52::a29f:3c1fNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.net 2606:4700:57::6ca2:c61fNOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.net 2a06:98c1:56::ac40:281fNOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.org 108.162.198.61NOERROR, 12 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.org 172.64.40.61NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.org 162.159.60.61NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.org 2606:4700:57::6ca2:c63dNOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.org 2a06:98c1:56::ac40:283dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0
blue.foundationdns.org 2803:f800:52::a29f:3c3dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.0

Checks

  • ✓ All respond #14
    All 18 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: blue.foundationdns.com: "2026.10.0"; blue.foundationdns.net: "2026.10.0"; blue.foundationdns.org: "2026.10.0". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2418113155 · primary blue.foundationdns.com

Found

Primary (MNAME)
blue.foundationdns.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418113155
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
blue.foundationdns.com (162.159.60.1)2418113155
blue.foundationdns.com (108.162.198.1)2418113155
blue.foundationdns.com (172.64.40.1)2418113155
blue.foundationdns.com (2606:4700:57::6ca2:c601)2418113155
blue.foundationdns.com (2803:f800:52::a29f:3c01)2418113155
blue.foundationdns.com (2a06:98c1:56::ac40:2801)2418113155
blue.foundationdns.net (108.162.198.31)2418113155
blue.foundationdns.net (172.64.40.31)2418113155
blue.foundationdns.net (162.159.60.31)2418113155
blue.foundationdns.net (2803:f800:52::a29f:3c1f)2418113155
blue.foundationdns.net (2606:4700:57::6ca2:c61f)2418113155
blue.foundationdns.net (2a06:98c1:56::ac40:281f)2418113155
blue.foundationdns.org (108.162.198.61)2418113155
blue.foundationdns.org (172.64.40.61)2418113155
blue.foundationdns.org (162.159.60.61)2418113155
blue.foundationdns.org (2606:4700:57::6ca2:c63d)2418113155
blue.foundationdns.org (2a06:98c1:56::ac40:283d)2418113155
blue.foundationdns.org (2803:f800:52::a29f:3c3d)2418113155

Checks

  • ✓ Serial 2418113155 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver blue.foundationdns.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2418113155 is a Unix timestamp (2046-08-17 10:05 UTC).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

info

73 records at the apex

Found

Read from
162.159.60.1:53
TypeValueTTL
SOAblue.foundationdns.com. dns.cloudflare.com. 2418113155 10000 2400 604800 18001800
NSblue.foundationdns.com.86400
NSblue.foundationdns.net.86400
NSblue.foundationdns.org.86400
A151.101.65.293600
A151.101.129.293600
A151.101.193.293600
A151.101.1.293600
AAAA2a04:4e42:400::2853600
AAAA2a04:4e42:200::2853600
AAAA2a04:4e42::2853600
AAAA2a04:4e42:600::2853600
MX10 mxa-009e5101.gslb.pphosted.com.3600
MX10 mxb-009e5101.gslb.pphosted.com.3600
TXT"MS=ms32183003"3600
TXT"_globalsign-domain-verification=p1fktqCHnOA1sE262wg61RlM1M1TddxeBhTTQfKOf-"3600
TXT"adobe-idp-site-verification=e3698045df155e7f8cf3b02c00c51c334c988ed32d2c35abf118b5455559d0fb"3600
TXT"airtable-verification=ab2905fae08cc438965f22077ffe0917"3600
TXT"anthropic-domain-verification-ssadh3=5QlR12RKrK6yot7p3HMOdRp65"3600
TXT"apple-domain-verification=y2Igt0Wg-UHV70fp8FwwAY0lXT7yuhgjH7LQCBWWn3k"3600
TXT"atlassian-domain-verification=B1e9uqeJyMnx/b8qh19lhS2HmbMwe7iMsn3YJUdW1FrMfjT5ZIZIApoe6mckiqGv"3600
TXT"atlassian-sending-domain-verification=ee4a120b-7262-4e68-b208-f80801824d31"3600
TXT"cisco-ci-domain-verification=20500cc295a110d0573b2bdc2093ab09b58730d8f8b963895b6a3133a368cb25"3600
TXT"cursor-domain-verification-eerey1=DeRjeVboCFaoJnWyaHOvbIMSV"3600
TXT"docker-verification=38689d18-8405-471e-8c40-0f79329477db"3600
TXT"docusign=32480aaa-d033-46e8-8295-f0a0a1a7a5dc"3600
TXT"docusign=401274e0-a81e-4f1e-9379-3d0cb24b0646"3600
TXT"docusign=b94148f1-8103-446e-be3c-c780204b2b73"3600
TXT"docusign=d717820e-c9d2-4c7f-8673-c52c7533107e"3600
TXT"google-site-verification=7Swb0dHV4cMeHcGWVdFuKZYVA6rhwGfDU0scbwz22-c"3600
TXT"google-site-verification=EMk53mZVKZzMKDvuxN7Izz5SrGePcS6YL9UU-O5p3Cw"3600
TXT"google-site-verification=Ne2Q3MQtiFamXAbgdT27mGRHEP1uH6u0S3hxE8oEIUg"3600
TXT"google-site-verification=RkXPYTo0sfAReK2PL4rFLzDvF69y68je5By3mbLYtTI"3600
TXT"google-site-verification=U_6jqgvCpjeeNLZEUNq4kW-yF4KXPrcUUifhpyjlJyQ"3600
TXT"google-site-verification=atbvv5AjB8MGJiGm0kJQicx405wRnH3IXkvhmevhlWs"3600
TXT"google-site-verification=hR-vohAQxRsRyvUskvHc58Ebvc4yVW7FXc7pyRzIdz4"3600
TXT"google-site-verification=w24oU5jGpVa8SU1Tznbo4CU8_m_WL6o-yDo0gosSBKY"3600
TXT"jamf-site-verification=0aiX3pBSM2fa-OoV_DbSDg"3600
TXT"linear-domain-verification=5h25z4iybzed"3600
TXT"loom-site-verification=cf88c3547adb422198e2effdcbc1822c"3600
TXT"meltwater_sso_20220613_TRITON-9222"3600
TXT"mgverify=19b8eb35bd233256b9c7b140bd3739975015fc9e05f760bf919fe5999bd01f0f"3600
TXT"notion-domain-verification=ulKLX952hySY2ToVspcw3nuYFf7ANxdT5aOZR2JpUby"3600
TXT"onetrust-domain-verification=1d14495f61ec44ddb84c7e861332306b"3600
TXT"onetrust-domain-verification=5785b70b49c94d87b375b04a26cb9a99"3600
TXT"onetrust-domain-verification=91fa27999c43422991e04989039fab48"3600
TXT"openai-domain-verification=08273489"3600
TXT"openai-domain-verification=dv-d02WfHAbY79UMiEztHNqRWoE"3600
TXT"smartsheet-site-validation=VnoFFHldpjUduBdwSfSrHI1U3dlbsp4P"3600
TXT"stripe-verification=0541ddd99d259a6b83784688d152e53689b3c7b62ab2a94c1af4881d8c325667"3600
TXT"stripe-verification=36a8ae673d2824b08508d33f51fbd183a78e598178cf455b3941b48b1ed1848c"3600
TXT"stripe-verification=6bb69f06400ffd81c173e80ece77f9cb903fd23583d37619628834425c8e0335"3600
TXT"stripe-verification=6fc06b28a4dce12135cfc982ee67b4f50ecdf24931633f46ed324b939e2d132c"3600
TXT"stripe-verification=7ce9b2bea1ac18f9f8081a240f771d3d36e6177de24d42e48b3c8f7fd5b0ba47"3600
TXT"stripe-verification=87f88a3ae169a524f546ed203d0cb22535e7f0e722a5004814cb828d3d1b342f"3600
TXT"stripe-verification=a3cd1e5407820ba2f4e9df948ed7871a2303c8488c66b781302677cccd05fde0"3600
TXT"stripe-verification=c6ba89f5464c6bfe6ee74b5e0b09d8f67bca1ba9d28ffb7c4d51067344241bbe"3600
TXT"teamviewer-sso-verification=f75e9fa8bd764fe28cfd406ac0863d88"3600
TXT"v=spf1 include:_spf.psm.knowbe4.com include:mail.zendesk.com include:_spf.presscloud.com include:helpscoutemail.com include:kayak.com._nspf.vali.email include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"3600
CAA0 iodef "mailto:ops@kayak.com"3600
CAA0 issue "awstrust.com"3600
CAA0 issue "comodoca.com"3600
CAA0 issue "digicert.com; cansignhttpexchanges=yes"3600
CAA0 issue "globalsign.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "pki.goog; cansignhttpexchanges=yes"3600
CAA0 issue "ssl.com"3600
CAA0 issuewild "amazon.com"3600
CAA0 issuewild "comodoca.com"3600
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"3600
CAA0 issuewild "ssl.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 1h, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: awstrust.com, comodoca.com, digicert.com, globalsign.com, letsencrypt.org, pki.goog, ssl.com, amazon.com.