xcritical.com

Checked 22 October 2026, 11:34 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · NameSilo, LLC · expires 2027-01-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
NameSilo, LLC
Registered
6 January 2016
Last changed
9 December 2025
Expires
6 January 2027
Status
client transfer prohibited
Registry nameservers
derek.ns.cloudflare.com, erin.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 2027-01-06 #3
    The registration is valid until 2027-01-06 (75 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

derek.ns.cloudflare.com, erin.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
derek.ns.cloudflare.com, erin.ns.cloudflare.com
NS in the zone
derek.ns.cloudflare.com, erin.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
derek.ns.cloudflare.com108.162.193.154 172.64.33.154 173.245.59.154 2803:f800:50::6ca2:c19a 2606:4700:58::adf5:3b9a 2a06:98c1:50::ac40:219aAS13335 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., US108.162.193.154 172.64.33.154 173.245.59.154 2606:4700:58::adf5:3b9a 2803:f800:50::6ca2:c19a 2a06:98c1:50::ac40:219a
erin.ns.cloudflare.com173.245.58.113 172.64.32.113 108.162.192.113 2a06:98c1:50::ac40:2071 2606:4700:50::adf5:3a71 2803:f800:50::6ca2:c071AS13335 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., US108.162.192.113 172.64.32.113 173.245.58.113 2606:4700:50::adf5:3a71 2803:f800:50::6ca2:c071 2a06:98c1:50::ac40:2071

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: derek.ns.cloudflare.com, erin.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
derek.ns.cloudflare.com 108.162.193.154NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
derek.ns.cloudflare.com 172.64.33.154NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
derek.ns.cloudflare.com 173.245.59.154NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
derek.ns.cloudflare.com 2803:f800:50::6ca2:c19aNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
derek.ns.cloudflare.com 2606:4700:58::adf5:3b9aNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
derek.ns.cloudflare.com 2a06:98c1:50::ac40:219aNOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
erin.ns.cloudflare.com 173.245.58.113NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
erin.ns.cloudflare.com 172.64.32.113NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
erin.ns.cloudflare.com 108.162.192.113NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
erin.ns.cloudflare.com 2a06:98c1:50::ac40:2071NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
erin.ns.cloudflare.com 2606:4700:50::adf5:3a71NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
erin.ns.cloudflare.com 2803:f800:50::6ca2:c071NOERROR, 15 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: derek.ns.cloudflare.com: "2026.10.2"; erin.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 2418060638 · primary derek.ns.cloudflare.com

Found

Primary (MNAME)
derek.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418060638
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
derek.ns.cloudflare.com (108.162.193.154)2418060638
derek.ns.cloudflare.com (172.64.33.154)2418060638
derek.ns.cloudflare.com (173.245.59.154)2418060638
derek.ns.cloudflare.com (2803:f800:50::6ca2:c19a)2418060638
derek.ns.cloudflare.com (2606:4700:58::adf5:3b9a)2418060638
derek.ns.cloudflare.com (2a06:98c1:50::ac40:219a)2418060638
erin.ns.cloudflare.com (173.245.58.113)2418060638
erin.ns.cloudflare.com (172.64.32.113)2418060638
erin.ns.cloudflare.com (108.162.192.113)2418060638
erin.ns.cloudflare.com (2a06:98c1:50::ac40:2071)2418060638
erin.ns.cloudflare.com (2606:4700:50::adf5:3a71)2418060638
erin.ns.cloudflare.com (2803:f800:50::6ca2:c071)2418060638

Checks

  • ✓ Serial 2418060638 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 derek.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 2418060638 is a Unix timestamp (2046-08-16 19:30 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

info

14 records at the apex

Found

Read from
108.162.193.154:53
TypeValueTTL
SOAderek.ns.cloudflare.com. dns.cloudflare.com. 2418060638 10000 2400 604800 18001800
NSderek.ns.cloudflare.com.86400
NSerin.ns.cloudflare.com.86400
A188.114.96.2300
A188.114.97.2300
AAAA2a06:98c1:3120::2300
AAAA2a06:98c1:3121::2300
MX5 mail.xcritical.com.600
TXT"MS=ms73265498"300
TXT"_globalsign-domain-verification=oeCFe2NWYS--9X9G40MhYOMZXk92K96E7cnxsjMUqZ"300
TXT"ahrefs-site-verification_27d690d4f8f4fd1e6e5e54e94623f2644b5588b603cb748c2321c741ef469711"300
TXT"google-site-verification=1bZAR3oqoIdL6UbElnwj7QMim4jJM7f-v0XtNP12hBk"300
TXT"unione-validate-hash=223d3beeaa3ce942d71f79c820a93b9c"300
TXT"v=spf1 ip4:185.235.186.0/25 include:spf.unisender.com include:_spf.elasticemail.com include:spf.unione.io ip4:34.252.187.78/32 ip4:23.83.65.108/32 ~all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 10m, 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.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35