webreference.com

Checked 22 October 2026, 11:25 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · NameCheap, Inc. · expires 2027-05-04

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
NameCheap, Inc.
Registered
5 May 1998
Last changed
15 April 2026
Expires
4 May 2027
Status
client transfer prohibited
Registry nameservers
isabel.ns.cloudflare.com, quincy.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 2027-05-04 #3
    The registration is valid until 2027-05-04 (193 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

isabel.ns.cloudflare.com, quincy.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
isabel.ns.cloudflare.com, quincy.ns.cloudflare.com
NS in the zone
isabel.ns.cloudflare.com, quincy.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
isabel.ns.cloudflare.com108.162.194.104 162.159.38.104 172.64.34.104 2606:4700:50::a29f:2668 2803:f800:50::6ca2:c268 2a06:98c1:50::ac40:2268AS13335 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., US108.162.194.104 162.159.38.104 172.64.34.104 2606:4700:50::a29f:2668 2803:f800:50::6ca2:c268 2a06:98c1:50::ac40:2268
quincy.ns.cloudflare.com108.162.195.39 172.64.35.39 162.159.44.39 2606:4700:58::a29f:2c27 2803:f800:50::6ca2:c327 2a06:98c1:50::ac40:2327AS13335 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., US108.162.195.39 162.159.44.39 172.64.35.39 2606:4700:58::a29f:2c27 2803:f800:50::6ca2:c327 2a06:98c1:50::ac40:2327

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: isabel.ns.cloudflare.com, quincy.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
isabel.ns.cloudflare.com 108.162.194.104NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
isabel.ns.cloudflare.com 162.159.38.104NOERROR, 33 ms, authoritativenoyes / yesrefused2026.10.2
isabel.ns.cloudflare.com 172.64.34.104NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
isabel.ns.cloudflare.com 2606:4700:50::a29f:2668NOERROR, 19 ms, authoritativenoyes / yesrefused2026.10.2
isabel.ns.cloudflare.com 2803:f800:50::6ca2:c268NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
isabel.ns.cloudflare.com 2a06:98c1:50::ac40:2268NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
quincy.ns.cloudflare.com 108.162.195.39NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
quincy.ns.cloudflare.com 172.64.35.39NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
quincy.ns.cloudflare.com 162.159.44.39NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
quincy.ns.cloudflare.com 2606:4700:58::a29f:2c27NOERROR, 18 ms, authoritativenoyes / yesrefused2026.10.2
quincy.ns.cloudflare.com 2803:f800:50::6ca2:c327NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
quincy.ns.cloudflare.com 2a06:98c1:50::ac40:2327NOERROR, 16 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: isabel.ns.cloudflare.com: "2026.10.2"; quincy.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 2417103135 · primary isabel.ns.cloudflare.com

Found

Primary (MNAME)
isabel.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417103135
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
isabel.ns.cloudflare.com (108.162.194.104)2417103135
isabel.ns.cloudflare.com (162.159.38.104)2417103135
isabel.ns.cloudflare.com (172.64.34.104)2417103135
isabel.ns.cloudflare.com (2606:4700:50::a29f:2668)2417103135
isabel.ns.cloudflare.com (2803:f800:50::6ca2:c268)2417103135
isabel.ns.cloudflare.com (2a06:98c1:50::ac40:2268)2417103135
quincy.ns.cloudflare.com (108.162.195.39)2417103135
quincy.ns.cloudflare.com (172.64.35.39)2417103135
quincy.ns.cloudflare.com (162.159.44.39)2417103135
quincy.ns.cloudflare.com (2606:4700:58::a29f:2c27)2417103135
quincy.ns.cloudflare.com (2803:f800:50::6ca2:c327)2417103135
quincy.ns.cloudflare.com (2a06:98c1:50::ac40:2327)2417103135

Checks

  • ✓ Serial 2417103135 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 isabel.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 2417103135 is a Unix timestamp (2046-08-05 17:32 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

12 records at the apex

Found

Read from
108.162.194.104:53
TypeValueTTL
SOAisabel.ns.cloudflare.com. dns.cloudflare.com. 2417103135 10000 2400 604800 18001800
NSisabel.ns.cloudflare.com.86400
NSquincy.ns.cloudflare.com.86400
A172.67.189.180300
A104.21.65.88300
AAAA2606:4700:3034::6815:4158300
AAAA2606:4700:3036::ac43:bdb4300
MX10 mail.protonmail.ch.300
MX20 mailsec.protonmail.ch.300
TXT"google-site-verification=9NYwPFDWexFV9mrjo51M9NKp-AAYMfAlmB_MfgIhNxo"300
TXT"protonmail-verification=c6fdafc8cfe9557f354d175f8d02f82a73cdf122"300
TXT"v=spf1 include:_spf.protonmail.ch mx ~all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 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.
  • 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