offcn.com

.com generic · Xiamen ChinaSource Internet Service Co., Ltd · expires 2026-11-09

Found

TLD

.com (generic)

ICANN policies apply

yes

Registrar

Xiamen ChinaSource Internet Service Co., Ltd

Registered

9 November 2002

Last changed

3 November 2025

Expires

9 November 2026

Status

client transfer prohibited

Registry nameservers

ns1.dnsv2.com, ns2.dnsv2.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 in 18 days

  The registration expires on 2026-11-09. Make sure it is renewed.

  #3
• ✓ 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.

ns1.dnsv2.com, ns2.dnsv2.com

Found

Parent zone

com

Delegation from

a.gtld-servers.net (192.5.6.30)

NS at the parent

ns1.dnsv2.com, ns2.dnsv2.com

NS in the zone

ns1.dnsv2.com, ns2.dnsv2.com

Checks

• i

  2 nameservers

  Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.dnsv2.com, ns2.dnsv2.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 9 IPv4 /24s and 0 IPv6 /48s.
• ✓ 9 autonomous systems #11

  The nameservers are spread over: AS132203 (TENCENT-NET-AP-CN - Tencent Building, Kejizhongyi Avenue, CN): 1 address; AS134756 (ChinaNet-NANJING-JISHAN-IDC - CHINANET Nanjing Jishan IDC network, CN): 1 address; AS136958 (UNICOM-GuangZhou-IDC - China Unicom Guangdong IP network, CN): 1 address; AS4134 (CHINANET-BACKBONE - No.31,Jin-rong Street, CN): 1 address; AS45090 (TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN): 2 addresses; AS4808 (CHINA169-BJ - China Unicom Beijing Province Network, CN): 1 address; AS4811 (CHINANET-SHANGHAI-MAN - China Telecom (Group), CN): 1 address; AS56046 (CMNET-Jiangsu-AP - China Mobile communications corporation, CN): 1 address; AS9808 (CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN): 1 address.
• 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
• !

  No IPv6

  None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

  #13

10 of 10 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 10 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.dnsv2.com: "DNSPod AUTHORITY DNS 7.3.2512.01"; ns2.dnsv2.com: "DNSPod AUTHORITY DNS 7.3.2512.01". 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.

serial 1790232400 · primary ns1.dnsv2.com

Found

Primary (MNAME)

ns1.dnsv2.com

Contact (RNAME)

level3dnsadmin.dnspod.com

Serial

1790232400

Refresh / retry

3600 s / 180 s

Expire

1209600 s

Negative TTL

180 s

Serial per nameserver

Checks

• ✓ Serial 1790232400 everywhere #22

  All nameservers serve the same version of the zone.
• !

  Unusual SOA timers

  negative caching TTL (minimum) 3m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1h, retry 3m, expire 14d, negative TTL 3m.

  #23
• ✓ Primary is a public nameserver #24

  The primary nameserver ns1.dnsv2.com is one of the listed nameservers.
• ✓ Contact level3dnsadmin@dnspod.com #25

  The SOA RNAME level3dnsadmin.dnspod.com means level3dnsadmin@dnspod.com.
• ✓ Timestamp serial #26

  The serial 1790232400 is a Unix timestamp (2026-09-24 06:46 UTC).

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

6 records at the apex

Found

Read from

1.13.76.55:53

Checks

• !

  Very low TTLs

  These records have a TTL below 5m, causing extra queries and slower lookups: A (10s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.

  #32
• ✓ 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