tenor.com

Checked 22 October 2026, 11:01 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-07-29

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
30 July 1995
Last changed
27 June 2026
Expires
29 July 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.googledomains.com, ns2.googledomains.com, ns3.googledomains.com, ns4.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 2027-07-29 #3
    The registration is valid until 2027-07-29 (279 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.googledomains.com, ns2.googledomains.com, ns3.googledomains.com, ns4.googledomains.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.googledomains.com, ns2.googledomains.com, ns3.googledomains.com, ns4.googledomains.com
NS in the zone
ns1.googledomains.com, ns2.googledomains.com, ns3.googledomains.com, ns4.googledomains.com
NameserverAddressesNetwork (AS)Glue
ns1.googledomains.com216.239.32.99 2001:4860:4802:32::63AS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:32::63 216.239.32.99
ns2.googledomains.com216.239.34.99 2001:4860:4802:34::63AS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:34::63 216.239.34.99
ns3.googledomains.com216.239.36.99 2001:4860:4802:36::63AS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:36::63 216.239.36.99
ns4.googledomains.com216.239.38.99 2001:4860:4802:38::63AS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:38::63 216.239.38.99

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.googledomains.com, ns2.googledomains.com, ns3.googledomains.com, ns4.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
ns1.googledomains.com 216.239.32.99NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns1.googledomains.com 2001:4860:4802:32::63NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns2.googledomains.com 216.239.34.99NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns2.googledomains.com 2001:4860:4802:34::63NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns3.googledomains.com 216.239.36.99NOERROR, 41 ms, authoritativenoyes / yesrefused-
ns3.googledomains.com 2001:4860:4802:36::63NOERROR, 42 ms, authoritativenoyes / yesrefused-
ns4.googledomains.com 216.239.38.99NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns4.googledomains.com 2001:4860:4802:38::63NOERROR, 12 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 ns1.googledomains.com

Found

Primary (MNAME)
ns1.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
ns1.googledomains.com (216.239.32.99)1
ns1.googledomains.com (2001:4860:4802:32::63)1
ns2.googledomains.com (216.239.34.99)1
ns2.googledomains.com (2001:4860:4802:34::63)1
ns3.googledomains.com (216.239.36.99)1
ns3.googledomains.com (2001:4860:4802:36::63)1
ns4.googledomains.com (216.239.38.99)1
ns4.googledomains.com (2001:4860:4802:38::63)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 ns1.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

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

14 records at the apex

Found

Read from
216.239.32.99:53
TypeValueTTL
SOAns1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 30021600
NSns3.googledomains.com.21600
NSns4.googledomains.com.21600
NSns1.googledomains.com.21600
NSns2.googledomains.com.21600
A34.120.13.18300
MX0 smtp.google.com.300
TXT"google-site-verification=Nh9OK_qhRomdZzfaMxpPXyf01DWB0HkbnwEVLGHYHnQ"1800
TXT"google-site-verification=Nv2VwIntwEzn2B3s3i-qXMTJX4zcPpblkSNnbirWHxM"1800
TXT"google-site-verification=NAFxbg-FbOnq-qMJSLevqLWGUHYyfTYdTXTlQNgV6Xs"1800
TXT"v=spf1 include:spf.mandrillapp.com include:_spf.google.com ~all"1800
CAA0 issue "pki.goog"86400
CAA0 issue "letsencrypt.org"86400
CAA0 issue "sectigo.com"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 6h. The NS TTL at the parent is 2d and in the zone 6h; 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, letsencrypt.org, sectigo.com.