yubico.com

Checked 22 October 2026, 11:41 UTC · via 8.8.8.8
!Passed with warnings
29 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2028-12-21

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
21 December 2006
Last changed
1 June 2026
Expires
21 December 2028
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns-cloud-e1.googledomains.com, ns-cloud-e2.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com
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 2028-12-21 #3
    The registration is valid until 2028-12-21 (791 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update 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

ns-cloud-e1.googledomains.com, ns-cloud-e2.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-cloud-e1.googledomains.com, ns-cloud-e2.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com
NS in the zone
ns-cloud-e1.googledomains.com, ns-cloud-e2.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com
NameserverAddressesNetwork (AS)Glue
ns-cloud-e1.googledomains.com216.239.32.110 2001:4860:4802:32::6eAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:32::6e 216.239.32.110
ns-cloud-e2.googledomains.com216.239.34.110 2001:4860:4802:34::6eAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:34::6e 216.239.34.110
ns-cloud-e3.googledomains.com216.239.36.110 2001:4860:4802:36::6eAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:36::6e 216.239.36.110
ns-cloud-e4.googledomains.com216.239.38.110 2001:4860:4802:38::6eAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:38::6e 216.239.38.110

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-cloud-e1.googledomains.com, ns-cloud-e2.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com.
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:4860:4802::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS15169 (GOOGLE - Google LLC, US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • i
    All nameserver names under .com
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-cloud-e1.googledomains.com 216.239.32.110NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-e1.googledomains.com 2001:4860:4802:32::6eNOERROR, 17 ms, authoritativenoyes / yesrefused-
ns-cloud-e2.googledomains.com 216.239.34.110NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-e2.googledomains.com 2001:4860:4802:34::6eNOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-e3.googledomains.com 216.239.36.110NOERROR, 42 ms, authoritativenoyes / yesrefused-
ns-cloud-e3.googledomains.com 2001:4860:4802:36::6eNOERROR, 43 ms, authoritativenoyes / yesrefused-
ns-cloud-e4.googledomains.com 216.239.38.110NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-e4.googledomains.com 2001:4860:4802:38::6eNOERROR, 13 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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

warn

serial 1 · primary ns-cloud-e1.googledomains.com

Found

Primary (MNAME)
ns-cloud-e1.googledomains.com
Contact (RNAME)
cloud-dns-hostmaster.google.com
Serial
1
Refresh / retry
21600 s / 3600 s
Expire
259200 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns-cloud-e1.googledomains.com (216.239.32.110)1
ns-cloud-e1.googledomains.com (2001:4860:4802:32::6e)1
ns-cloud-e2.googledomains.com (216.239.34.110)1
ns-cloud-e2.googledomains.com (2001:4860:4802:34::6e)1
ns-cloud-e3.googledomains.com (216.239.36.110)1
ns-cloud-e3.googledomains.com (2001:4860:4802:36::6e)1
ns-cloud-e4.googledomains.com (216.239.38.110)1
ns-cloud-e4.googledomains.com (2001:4860:4802:38::6e)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 3d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 6h, retry 1h, expire 3d, negative TTL 5m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-cloud-e1.googledomains.com is one of the listed nameservers.
  • ✓ Contact cloud-dns-hostmaster@google.com #25
    The SOA RNAME cloud-dns-hostmaster.google.com means cloud-dns-hostmaster@google.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
1 iterations, 8-byte salt
Signatures valid until
10 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
25466ECDSAP256SHA256 (13)SHA256 E75EEF573C5A1490…yes

DNSKEY in the zone

Key tagRoleAlgorithm
25466KSK (257)ECDSAP256SHA256 (13)
19239ZSK (256)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 25466 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-10 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-10 17:05 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 1 iteration and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Records

pass

48 records at the apex

Found

Read from
216.239.32.110:53
TypeValueTTL
SOAns-cloud-e1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 30021600
NSns-cloud-e1.googledomains.com.10800
NSns-cloud-e4.googledomains.com.10800
NSns-cloud-e2.googledomains.com.10800
NSns-cloud-e3.googledomains.com.10800
A151.101.66.114300
A151.101.194.114300
A151.101.2.114300
A151.101.130.114300
AAAA2a04:4e42::626300
AAAA2a04:4e42:400::626300
AAAA2a04:4e42:200::626300
AAAA2a04:4e42:600::626300
MX1 aspmx.l.google.com.86400
MX5 alt1.aspmx.l.google.com.86400
MX10 alt4.aspmx.l.google.com.86400
MX10 alt3.aspmx.l.google.com.86400
MX5 alt2.aspmx.l.google.com.86400
TXT"atlassian-sending-domain-verification=762db5fe-698c-4d93-a0ed-b4415055f802"10800
TXT"adobe-idp-site-verification=8233cb63a0e1bc2cf5b686c37454a22cd3684022d171c40d9a7cdb299c627fd1"10800
TXT"apple-domain-verification=i0pfFG8KLQYxra5p"10800
TXT"MS=ms15291863"10800
TXT"google-site-verification=1Q7E_o_fcik3HTCdhgqWhULWNp3Tc3V8UbdFiv9usvI"10800
TXT"google-site-verification=IHur8NDPA0N7kMAF1f2q_vJ-Rk7S8hxpcvn92sEew-s"10800
TXT"google-site-verification=aKR17QT6FyB3SwlRCUfJkYW82P0uU_4vIk3iBGjb7wY"10800
TXT"anthropic-domain-verification-deaz83=yHN9eCQxU1mw3wByrETKFQYGG"10800
TXT"v=spf1 include:_spf.google.com include:rp.oracleemaildelivery.com include:eu.rp.oracleemaildelivery.com include:ap.rp.oracleemaildelivery.com exists:%{i}._spf.mta.salesforce.com ~all"10800
TXT"box-domain-verification=a2d738f705ecaa2dd9aafdf862889a09c1d96eef8f73673250f04b3fd0624809"10800
TXT"google-site-verification=KzzqYTzZ6c_YEowjKkmu7woBL2G9Z0VQgiR5nh8ndVc"10800
TXT"1password-site-verification=C4VBIWTNYFER5OOCHVJU2MTAII"10800
TXT"slack-domain-verification=iRSAt0gjfeLmlsS50OKy7pZFFt8ANdQdAhdnH33t"10800
TXT"docusign=344e3a2e-fe49-42a4-b5ae-fd23dcc0b72f"10800
TXT"veremark-domain-verification-33mmwa=KKsw5Pt7DBoDmOCIqokf0wEqo"10800
TXT"atlassian-domain-verification=ipTaHvUYHB5m2sGAHn+wb0QAZaDU1OhT9I1zWtt5qbn81IDeYBquZ+lcXlrYOPCx"10800
TXT"google-site-verification=3dYE5o6tXr58Ifp_dTq21Pe78QFiWgA_ZgLviwczyGY"10800
TXT"have-i-been-pwned-verification=7528d8520a54a3233cb42c26bef59498"10800
TXT"google-site-verification=hcIIuU6G5UO3j9EpXQppIZxJIP64jHgxFDpTyAw8VLM"10800
TXT"google-site-verification=dSJYQW_buweb2dPfaXPJslY-ccmx_zIGbR1hffFU1fs"10800
TXT"asv=d97e483b7a01012ed7d4a3571fc4f5fe"10800
TXT"google-site-verification=E1u4QIF_yGIEmo1_LSfDWeP9pWQEnzSuunTGXfluvWc"10800
TXT"docker-verification=7eaae4cf-2bdb-4528-8c12-ae3ec18d9dac"10800
TXT"google-site-verification=cm0ud8DosbawIseioZWR5-l6uLFogwEYR8OpHXcWe1w"10800
TXT"openai-domain-verification=dv-XWDYVl32jJzCksJZcOUk7Tyc"10800
CAA0 issue "amazon.com"10800
CAA0 issue "globalsign.com"10800
CAA0 issue "digicert.com"10800
CAA0 issue "letsencrypt.org"10800
CAA0 iodef "mailto:tlsadmin@yubico.com"10800

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 1d, NS 3h. The NS TTL at the parent is 2d and in the zone 3h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: amazon.com, globalsign.com, digicert.com, letsencrypt.org.