stackoverflow.com

Checked 22 October 2026, 10:51 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-02-02

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
26 December 2003
Last changed
29 January 2026
Expires
2 February 2027
Status
client transfer prohibited
Registry nameservers
damian.ns.cloudflare.com, sureena.ns.cloudflare.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 2027-02-02 #3
    The registration is valid until 2027-02-02 (103 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

damian.ns.cloudflare.com, sureena.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
damian.ns.cloudflare.com, sureena.ns.cloudflare.com
NS in the zone
damian.ns.cloudflare.com, sureena.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
damian.ns.cloudflare.com108.162.195.50 162.159.44.50 172.64.35.50 2a06:98c1:50::ac40:2332 2803:f800:50::6ca2:c332 2606:4700:58::a29f:2c32AS13335 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., US108.162.195.50 162.159.44.50 172.64.35.50 2606:4700:58::a29f:2c32 2803:f800:50::6ca2:c332 2a06:98c1:50::ac40:2332
sureena.ns.cloudflare.com172.64.34.126 162.159.38.126 108.162.194.126 2a06:98c1:50::ac40:227e 2803:f800:50::6ca2:c27e 2606:4700:50::a29f:267eAS13335 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., US108.162.194.126 162.159.38.126 172.64.34.126 2606:4700:50::a29f:267e 2803:f800:50::6ca2:c27e 2a06:98c1:50::ac40:227e

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: damian.ns.cloudflare.com, sureena.ns.cloudflare.com.
    #6
  • ✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
damian.ns.cloudflare.com 108.162.195.50NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
damian.ns.cloudflare.com 162.159.44.50NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
damian.ns.cloudflare.com 172.64.35.50NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
damian.ns.cloudflare.com 2a06:98c1:50::ac40:2332NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
damian.ns.cloudflare.com 2803:f800:50::6ca2:c332NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
damian.ns.cloudflare.com 2606:4700:58::a29f:2c32NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
sureena.ns.cloudflare.com 172.64.34.126NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
sureena.ns.cloudflare.com 162.159.38.126NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
sureena.ns.cloudflare.com 108.162.194.126NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
sureena.ns.cloudflare.com 2a06:98c1:50::ac40:227eNOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
sureena.ns.cloudflare.com 2803:f800:50::6ca2:c27eNOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
sureena.ns.cloudflare.com 2606:4700:50::a29f:267eNOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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: damian.ns.cloudflare.com: "2026.10.2"; sureena.ns.cloudflare.com: "2026.10.2". 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 2418139665 · primary damian.ns.cloudflare.com

Found

Primary (MNAME)
damian.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418139665
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
damian.ns.cloudflare.com (108.162.195.50)2418139665
damian.ns.cloudflare.com (162.159.44.50)2418139665
damian.ns.cloudflare.com (172.64.35.50)2418139665
damian.ns.cloudflare.com (2a06:98c1:50::ac40:2332)2418139665
damian.ns.cloudflare.com (2803:f800:50::6ca2:c332)2418139665
damian.ns.cloudflare.com (2606:4700:58::a29f:2c32)2418139665
sureena.ns.cloudflare.com (172.64.34.126)2418139665
sureena.ns.cloudflare.com (162.159.38.126)2418139665
sureena.ns.cloudflare.com (108.162.194.126)2418139665
sureena.ns.cloudflare.com (2a06:98c1:50::ac40:227e)2418139665
sureena.ns.cloudflare.com (2803:f800:50::6ca2:c27e)2418139665
sureena.ns.cloudflare.com (2606:4700:50::a29f:267e)2418139665

Checks

  • ✓ Serial 2418139665 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 damian.ns.cloudflare.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 2418139665 is a Unix timestamp (2046-08-17 17:27 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

44 records at the apex

Found

Read from
108.162.195.50:53
TypeValueTTL
SOAdamian.ns.cloudflare.com. dns.cloudflare.com. 2418139665 10000 2400 604800 18001800
NSdamian.ns.cloudflare.com.86400
NSsureena.ns.cloudflare.com.86400
A198.252.206.1300
MX1 aspmx.l.google.com.300
MX10 alt3.aspmx.l.google.com.300
MX10 alt4.aspmx.l.google.com.300
MX5 alt1.aspmx.l.google.com.300
MX5 alt2.aspmx.l.google.com.300
TXT"MS=ms52592611"300
TXT"ZOOM_verify_AbkNwz5bBl0eurcDKyhhuk"300
TXT"adobe-idp-site-verification=25ba5203f3687c9cd6ee3223ee5de1528917828d1da3ebd3bd9a44094cbfc4ac"300
TXT"anthropic-domain-verification-q70207=cKyy0llXkD10O4rDQpWz8tQ5K"300
TXT"apple-domain-verification=O9jlnJXAQ7sNSZqC"300
TXT"atlassian-domain-verification=byLeZgl3MIcfOqwWuMhq8Fhr/1zem/jIaouJegvDZbBKUU5OqhwDjdpkyYg5CTzm"300
TXT"cursor-domain-verification-sb0ayf=Pk6AyptQuTpzpcuSlfYGWloxv"300
TXT"docker-verification=d65aee54-9091-4ceb-b792-61f5d5804050"300
TXT"docusign=4262531d-29f4-4a62-9f33-ae9f66f5247b"300
TXT"google-site-verification=2Bi6SYw5skkRexdtdLPL2gpxeIhLxnYVqITVP9Htl3w"300
TXT"google-site-verification=ctogLnZNAdc_CXq8yOhODMLpmugGynjxKecKHDz4oL8"300
TXT"google-site-verification=o3EMam8yBGo1yEjyybIiZcOunGHOQKpo8JmOtp9n1BU"300
TXT"google-site-verification=rdWtMbplKjbRHGr2dNONfwkqithlUvjr3u6i8QEz_mo"300
TXT"ibmid=4e7cbbb3-5f12-40b4-96c7-5b064347b822"300
TXT"make-domain-verification=eec31159-f381-4f38-9d89-e59123dd023e"300
TXT"onetrust-domain-verification=0d9d67f856334905a54256085a5768b3"300
TXT"onetrust-domain-verification=e445562296a64c649ae3d520230b8c4c"300
TXT"openai-domain-verification=dv-GLNufzbWDzAq0fDXHD6jxeCK"300
TXT"profound-domain-verification-5p599x=hWudYd2Du6WOYOod5ko9Rwnp8"300
TXT"v=MCPv1; k=ed25519; p=VhBofO8RaYvTvHT7q5tTty+HQeCU8R6h5Y8k/sj20So="300
TXT"v=spf1 ip4:52.38.191.241 include:_spf.google.com include:mailgun.org include:sendgrid.net include:mail.zendesk.com include:spf.tipalti.com ~all"300
TXT"work-os-domain-verification-43a3e0=GoDUTSc5MMjDaiIC3s5yRKqMD"300
CAA0 issue "comodoca.com"300
CAA0 issue "digicert.com; cansignhttpexchanges=yes"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issue "sectigo.com"300
CAA0 issue "ssl.com"300
CAA0 issuewild "comodoca.com"300
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"300
CAA0 issuewild "letsencrypt.org"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "sectigo.com"300
CAA0 issuewild "ssl.com"300
CAA128 iodef "mailto:sysadmin-team@stackoverflow.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, 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.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: comodoca.com, digicert.com, letsencrypt.org, pki.goog, sectigo.com, ssl.com.