x0.com

Checked 22 October 2026, 11:34 UTC · via 8.8.8.8
!Passed with warnings
23 passed 3 warnings 0 failed 5 info

Registration

info

.com generic · Japan Registry Services Co., Ltd. · expires 2027-07-09

Found

TLD
.com (generic)
Public suffix
.x0.com
ICANN policies apply
yes
Registrar
Japan Registry Services Co., Ltd.
Registered
10 July 1997
Last changed
26 June 2026
Expires
9 July 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.dns.ne.jp, ns2.dns.ne.jp
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. Domains are registered under the public suffix .x0.com.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-07-09 #3
    The registration is valid until 2027-07-09 (259 days).
  • ✓ Transfer locked #4
    Registry status: client delete 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

warn

ns1.dns.ne.jp, ns2.dns.ne.jp

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.dns.ne.jp, ns2.dns.ne.jp
NS in the zone
ns1.dns.ne.jp, ns2.dns.ne.jp
NameserverAddressesNetwork (AS)Glue
ns1.dns.ne.jp61.211.236.1AS9370 SAKURA-B - SAKURA Internet Inc., JP-
ns2.dns.ne.jp133.167.21.1AS9371 SAKURA-C - SAKURA Internet Inc., JP-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.dns.ne.jp, ns2.dns.ne.jp.
    #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 2 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS9370 (SAKURA-B - SAKURA Internet Inc., JP): 1 address; AS9371 (SAKURA-C - SAKURA Internet Inc., JP): 1 address.
  • i
    All nameserver names under .jp
    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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dns.ne.jp 61.211.236.1NOERROR, 241 ms, authoritativenoyes / yesrefusedNominum ANS 5.4.2.0
ns2.dns.ne.jp 133.167.21.1NOERROR, 247 ms, authoritativenoyes / yesrefusedNSD 4.1.23

Checks

  • ✓ All respond #14
    All 2 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: ns1.dns.ne.jp: "Nominum ANS 5.4.2.0"; ns2.dns.ne.jp: "NSD 4.1.23". 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

info

serial 2026101500 · primary dns.sakura.ad.jp

Found

Primary (MNAME)
dns.sakura.ad.jp
Contact (RNAME)
noc.sakura.ad.jp
Serial
2026101500
Refresh / retry
3600 s / 900 s
Expire
3600000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.dns.ne.jp (61.211.236.1)2026101500
ns2.dns.ne.jp (133.167.21.1)2026101500

Checks

  • ✓ Serial 2026101500 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 1000h, negative TTL 1h.
  • i
    Hidden master
    The primary nameserver dns.sakura.ad.jp is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact noc@sakura.ad.jp #25
    The SOA RNAME noc.sakura.ad.jp means noc@sakura.ad.jp.
  • ✓ Date-based serial #26
    The serial 2026101500 follows the YYYYMMDDnn convention (2026-10-15).

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

3 records at the apex

Found

Read from
61.211.236.1:53
TypeValueTTL
SOAdns.sakura.ad.jp. noc.sakura.ad.jp. 2026101500 3600 900 3600000 36003600
NSns1.dns.ne.jp.3600
NSns2.dns.ne.jp.3600

Checks

  • ✓ TTLs within range #32
    TTLs: 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