langchain.com

Checked 22 October 2026, 09:34 UTC · via 8.8.8.8
!Passed with warnings
29 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · GoDaddy.com, LLC · expires 2029-12-03

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
3 December 2019
Last changed
17 December 2025
Expires
3 December 2029
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.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 2029-12-03 #3
    The registration is valid until 2029-12-03 (1138 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew 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

ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.googledomains.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.googledomains.com
NS in the zone
ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.googledomains.com
NameserverAddressesNetwork (AS)Glue
ns-cloud-c1.googledomains.com216.239.32.108 2001:4860:4802:32::6cAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:32::6c 216.239.32.108
ns-cloud-c2.googledomains.com216.239.34.108 2001:4860:4802:34::6cAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:34::6c 216.239.34.108
ns-cloud-c3.googledomains.com216.239.36.108 2001:4860:4802:36::6cAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:36::6c 216.239.36.108
ns-cloud-c4.googledomains.com216.239.38.108 2001:4860:4802:38::6cAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:38::6c 216.239.38.108

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.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-c1.googledomains.com 216.239.32.108NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns-cloud-c1.googledomains.com 2001:4860:4802:32::6cNOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-c2.googledomains.com 216.239.34.108NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-c2.googledomains.com 2001:4860:4802:34::6cNOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-c3.googledomains.com 216.239.36.108NOERROR, 41 ms, authoritativenoyes / yesrefused-
ns-cloud-c3.googledomains.com 2001:4860:4802:36::6cNOERROR, 41 ms, authoritativenoyes / yesrefused-
ns-cloud-c4.googledomains.com 216.239.38.108NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-c4.googledomains.com 2001:4860:4802:38::6cNOERROR, 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 2 · primary ns-cloud-c1.googledomains.com

Found

Primary (MNAME)
ns-cloud-c1.googledomains.com
Contact (RNAME)
cloud-dns-hostmaster.google.com
Serial
2
Refresh / retry
21600 s / 3600 s
Expire
259200 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns-cloud-c1.googledomains.com (216.239.32.108)2
ns-cloud-c1.googledomains.com (2001:4860:4802:32::6c)2
ns-cloud-c2.googledomains.com (216.239.34.108)2
ns-cloud-c2.googledomains.com (2001:4860:4802:34::6c)2
ns-cloud-c3.googledomains.com (216.239.36.108)2
ns-cloud-c3.googledomains.com (2001:4860:4802:36::6c)2
ns-cloud-c4.googledomains.com (216.239.38.108)2
ns-cloud-c4.googledomains.com (2001:4860:4802:38::6c)2

Checks

  • ✓ Serial 2 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-c1.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 2 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
9 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
46015RSASHA256 (8)SHA256 2DBA2D592D013018…yes

DNSKEY in the zone

Key tagRoleAlgorithm
2614ZSK (256)RSASHA256 (8)
46015KSK (257)RSASHA256 (8)

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 46015 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-09 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-09 20:18 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

25 records at the apex

Found

Read from
216.239.32.108:53
TypeValueTTL
SOAns-cloud-c1.googledomains.com. cloud-dns-hostmaster.google.com. 2 21600 3600 259200 30021600
NSns-cloud-c4.googledomains.com.21600
NSns-cloud-c3.googledomains.com.21600
NSns-cloud-c2.googledomains.com.21600
NSns-cloud-c1.googledomains.com.21600
A198.202.211.1300
MX1 smtp.google.com.300
TXT"linkedin-site-verification=f15545d4-d50f-424a-9076-ceebd5e91424"3600
TXT"google-site-verification=nezqC2hbpeFSFJDIKE_6_ADSKsl4j9dTvwk782NSL9E"3600
TXT"xbuvf8ogot"3600
TXT"MS=ms60202630"3600
TXT"google-site-verification=wP16h2Joxep73RW-Hb8fneAizDK4FCn_6a4DnsbOdrM"3600
TXT"google-site-verification=d192uA19ZkwkREu9NZKM9hxDB1t90uIMHp5gFbBBuzw"3600
TXT"google-site-verification=MZV-DrUglhroyDj0lCk7AP5YOKy4GGEgUaIyLjCXEb8"3600
TXT"google-site-verification=wUPxN5SwJJSQGceU6cVjpkHI-08DZaqJSlAgg_55nj4"3600
TXT"v=spf1 include:_spf.google.com include:242623570.spf06.hubspotemail.net include:servers.mcsv.net ~all"3600
CAA0 issuewild "letsencrypt.org"300
CAA0 issue "digicert.com; cansignhttpexchanges=yes"300
CAA0 issue "amazon.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "sectigo.com"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "sectigo.com"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"300

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: letsencrypt.org, digicert.com, amazon.com, sectigo.com, pki.goog.