zx2c4.com

Checked 22 October 2026, 11:44 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 5 info

Registration

info

.com generic · Squarespace Domains II LLC · expires 2032-04-21

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Squarespace Domains II LLC
Registered
21 April 2000
Last changed
2 July 2024
Expires
21 April 2032
Status
client delete prohibited, client transfer prohibited
Registry nameservers
ns1.zx2c4.com, ns2.zx2c4.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 2032-04-21 #3
    The registration is valid until 2032-04-21 (2007 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.zx2c4.com, ns2.zx2c4.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.zx2c4.com, ns2.zx2c4.com
NS in the zone
ns1.zx2c4.com, ns2.zx2c4.com
NameserverAddressesNetwork (AS)Glue
ns1.zx2c4.com157.230.217.199 2604:a880:400:d0::1f58:8001AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US157.230.217.199 2604:a880:400:d0::1f58:8001
ns2.zx2c4.com188.166.160.135 2a03:b0c0:3:d0::10c7:2001AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US188.166.160.135 2a03:b0c0:3:d0::10c7:2001

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.zx2c4.com, ns2.zx2c4.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.zx2c4.com, ns2.zx2c4.com.
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS14061 (DIGITALOCEAN-ASN - DigitalOcean, LLC, US): 4 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

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.zx2c4.com 157.230.217.199NOERROR, 92 ms, authoritativenoyes / yesrefused-
ns1.zx2c4.com 2604:a880:400:d0::1f58:8001NOERROR, 86 ms, authoritativenoyes / yesrefused-
ns2.zx2c4.com 188.166.160.135NOERROR, 5 ms, authoritativenoyes / yesrefused-
ns2.zx2c4.com 2a03:b0c0:3:d0::10c7:2001NOERROR, 5 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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

pass

serial 2026101801 · primary ns1.zx2c4.com

Found

Primary (MNAME)
ns1.zx2c4.com
Contact (RNAME)
jason.zx2c4.com
Serial
2026101801
Refresh / retry
2000 s / 180 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.zx2c4.com (157.230.217.199)2026101801
ns1.zx2c4.com (2604:a880:400:d0::1f58:8001)2026101801
ns2.zx2c4.com (188.166.160.135)2026101801
ns2.zx2c4.com (2a03:b0c0:3:d0::10c7:2001)2026101801

Checks

  • ✓ Serial 2026101801 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 33m20s, retry 3m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.zx2c4.com is one of the listed nameservers.
  • ✓ Contact jason@zx2c4.com #25
    The SOA RNAME jason.zx2c4.com means jason@zx2c4.com.
  • ✓ Date-based serial #26
    The serial 2026101801 follows the YYYYMMDDnn convention (2026-10-18).

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

8 records at the apex

Found

Read from
157.230.217.199:53
TypeValueTTL
SOAns1.zx2c4.com. jason.zx2c4.com. 2026101801 2000 180 1209600 36003600
NSns1.zx2c4.com.3600
NSns2.zx2c4.com.3600
A192.248.189.2153600
AAAA2001:19f0:6c00:1634:925a:8ff:fe78:43ec3600
MX1 smtp.google.com.3600
TXT"v=spf1 a:mail.zx2c4.com include:_spf.kernel.org include:_spf.google.com ~all"3600
TXT"google-site-verification=YpE7u8b4O44Oei3OX6NMuWcev6blXl13OZ0ik-HgSVw"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 1h, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; 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