thinkwithgoogle.com

Checked 22 October 2026, 11:04 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-06-02

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
2 June 2010
Last changed
1 May 2026
Expires
2 June 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.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 2027-06-02 #3
    The registration is valid until 2027-06-02 (223 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.com
NS in the zone
ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.com
NameserverAddressesNetwork (AS)Glue
ns1.google.com216.239.32.10 2001:4860:4802:32::aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:32::a 216.239.32.10
ns2.google.com216.239.34.10 2001:4860:4802:34::aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:34::a 216.239.34.10
ns3.google.com216.239.36.10 2001:4860:4802:36::aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:36::a 216.239.36.10
ns4.google.com216.239.38.10 2001:4860:4802:38::aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:38::a 216.239.38.10

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.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
ns1.google.com 216.239.32.10NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns1.google.com 2001:4860:4802:32::aNOERROR, 11 ms, authoritativenoyes / yesrefused-
ns2.google.com 216.239.34.10NOERROR, 24 ms, authoritativenoyes / yesrefused-
ns2.google.com 2001:4860:4802:34::aNOERROR, 24 ms, authoritativenoyes / yesrefused-
ns3.google.com 216.239.36.10NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns3.google.com 2001:4860:4802:36::aNOERROR, 11 ms, authoritativenoyes / yesrefused-
ns4.google.com 216.239.38.10NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns4.google.com 2001:4860:4802:38::aNOERROR, 5 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 1003797344 · primary ns1.google.com

Found

Primary (MNAME)
ns1.google.com
Contact (RNAME)
dns-admin.google.com
Serial
1003797344
Refresh / retry
900 s / 900 s
Expire
1800 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
ns1.google.com (216.239.32.10)1003797344
ns1.google.com (2001:4860:4802:32::a)1003797344
ns2.google.com (216.239.34.10)1003797344
ns2.google.com (2001:4860:4802:34::a)1003797344
ns3.google.com (216.239.36.10)1003797344
ns3.google.com (2001:4860:4802:36::a)1003797344
ns4.google.com (216.239.38.10)1003797344
ns4.google.com (2001:4860:4802:38::a)1003797344

Checks

  • ✓ Serial 1003797344 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d; retry 15m should be shorter than refresh 15m; expire 30m is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 30m must be longer than refresh + retry; negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 15m, retry 15m, expire 30m, negative TTL 1m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.google.com is one of the listed nameservers.
  • ✓ Contact dns-admin@google.com #25
    The SOA RNAME dns-admin.google.com means dns-admin@google.com.
  • ✓ Timestamp serial #26
    The serial 1003797344 is a Unix timestamp (2001-10-23 00:35 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

pass

18 records at the apex

Found

Read from
216.239.32.10:53
TypeValueTTL
SOAns1.google.com. dns-admin.google.com. 1003797344 900 900 1800 6060
NSns2.google.com.345600
NSns3.google.com.345600
NSns4.google.com.345600
NSns1.google.com.345600
A142.251.110.100300
A142.251.110.113300
A142.251.110.139300
A142.251.110.101300
A142.251.110.102300
A142.251.110.138300
AAAA2a00:1450:4001:c1f::71300
AAAA2a00:1450:4001:c1f::8b300
AAAA2a00:1450:4001:c1f::8a300
AAAA2a00:1450:4001:c1f::64300
TXT"facebook-domain-verification=sbvz693hyqny6ag4fjqyse15bm6uz0"300
TXT"v=spf1 -all"300
CAA0 issue "pki.goog"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, NS 4d. The NS TTL at the parent is 2d and in the zone 4d; 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: pki.goog.