56.com

Checked 22 October 2026, 07:33 UTC · via 8.8.8.8
✗Problems found
21 passed 3 warnings 1 failed 6 info

Registration

info

.com generic · MarkMonitor Information Technology (Shanghai) Co., Ltd. · expires 2027-07-13

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Information Technology (Shanghai) Co., Ltd.
Registered
14 July 1998
Last changed
16 April 2026
Expires
13 July 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns11.sohu.com, ns12.sohu.com, ns13.sohu.com, ns14.sohu.com, ns15.sohu.com, ns16.sohu.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 2027-07-13 #3
    The registration is valid until 2027-07-13 (263 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns11.sohu.com, ns12.sohu.com, ns13.sohu.com, ns14.sohu.com, ns15.sohu.com, ns16.sohu.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns11.sohu.com, ns12.sohu.com, ns13.sohu.com, ns14.sohu.com, ns15.sohu.com, ns16.sohu.com
NS in the zone
ns11.sohu.com, ns12.sohu.com, ns13.sohu.com, ns14.sohu.com, ns15.sohu.com, ns16.sohu.com
NameserverAddressesNetwork (AS)Glue
ns11.sohu.com109.244.23.12 2402:4e00:4020:3000::60AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN109.244.23.12 2402:4e00:4020:3000::60
ns12.sohu.com49.234.52.149 110.43.83.56 2402:4e00:4020:3000::80AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN AS141679 CHINATELECOM-IDC-BTHBD-AP - China Telecom Beijing Tianjin Hebei Big Data Industry Park Branch, CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN2402:4e00:4020:3000::80 49.234.52.149
ns13.sohu.com125.254.168.150 122.9.117.121AS23724 CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN AS58466 CT-Guangzhou-IDC - CHINANET Guangdong province network, CN122.9.117.121
ns14.sohu.com39.156.83.207AS9808 CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN39.156.83.207
ns15.sohu.com109.244.23.101AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN109.244.23.101
ns16.sohu.com125.254.168.151AS23724 CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN125.254.168.151

Checks

  • ✓ 6 nameservers #6
    Delegated to ns11.sohu.com, ns12.sohu.com, ns13.sohu.com, ns14.sohu.com, ns15.sohu.com, ns16.sohu.com.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns12.sohu.com (glue 2402:4e00:4020:3000::80, 49.234.52.149, zone 49.234.52.149, 110.43.83.56, 2402:4e00:4020:3000::80); ns13.sohu.com (glue 122.9.117.121, zone 125.254.168.150, 122.9.117.121). Update the glue at your registrar.
    #8
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2402:4e00:4020::/48, while the other address family is spread over several networks.
    #10
  • ✓ 5 autonomous systems #11
    The nameservers are spread over: AS141679 (CHINATELECOM-IDC-BTHBD-AP - China Telecom Beijing Tianjin Hebei Big Data Industry Park Branch, CN): 1 address; AS23724 (CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN): 2 addresses; AS45090 (TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN): 5 addresses; AS58466 (CT-Guangzhou-IDC - CHINANET Guangdong province network, 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns13.sohu.com, ns14.sohu.com, ns15.sohu.com, ns16.sohu.com.
    #13

Nameservers

fail

9 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns11.sohu.com 109.244.23.12NOERROR, 154 ms, authoritativenoyes / yesrefused-
ns11.sohu.com 2402:4e00:4020:3000::60NOERROR, 140 ms, authoritativenoyes / yesrefused-
ns12.sohu.com 49.234.52.149NOERROR, 210 ms, authoritativenoyes / yesrefused-
ns12.sohu.com 110.43.83.56NOERROR, 153 ms, authoritativenoyes / yesrefused-
ns12.sohu.com 2402:4e00:4020:3000::80NOERROR, 138 ms, authoritativenoyes / yesrefused-
ns13.sohu.com 125.254.168.150no responsenono / no--
ns13.sohu.com 122.9.117.121NOERROR, 204 ms, authoritativenoyes / yesrefused-
ns14.sohu.com 39.156.83.207NOERROR, 137 ms, authoritativenoyes / yesrefused-
ns15.sohu.com 109.244.23.101NOERROR, 159 ms, authoritativenoyes / yesrefused-
ns16.sohu.com 125.254.168.151NOERROR, 158 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns13.sohu.com (125.254.168.150): read udp 46.225.38.91:35075->125.254.168.150:53: i/o timeout.
    #14
  • ✓ 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

warn

serial 171213001 · primary ns11.sohu.com

Found

Primary (MNAME)
ns11.sohu.com
Contact (RNAME)
dnsadmin.sohu-inc.com
Serial
171213001
Refresh / retry
28800 s / 7200 s
Expire
1209600 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
ns11.sohu.com (109.244.23.12)171213001
ns11.sohu.com (2402:4e00:4020:3000::60)171213001
ns12.sohu.com (49.234.52.149)171213001
ns12.sohu.com (110.43.83.56)171213001
ns12.sohu.com (2402:4e00:4020:3000::80)171213001
ns13.sohu.com (122.9.117.121)171213001
ns14.sohu.com (39.156.83.207)171213001
ns15.sohu.com (109.244.23.101)171213001
ns16.sohu.com (125.254.168.151)171213001

Checks

  • ✓ Serial 171213001 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 8h, retry 2h, expire 14d, negative TTL 1m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns11.sohu.com is one of the listed nameservers.
  • ✓ Contact dnsadmin@sohu-inc.com #25
    The SOA RNAME dnsadmin.sohu-inc.com means dnsadmin@sohu-inc.com.
  • ✓ Counter serial #26
    The serial 171213001 is a plain counter.

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

10 records at the apex

Found

Read from
109.244.23.12:53
TypeValueTTL
SOAns11.sohu.com. dnsadmin.sohu-inc.com. 171213001 28800 7200 1209600 60600
NSns15.sohu.com.86400
NSns11.sohu.com.86400
NSns13.sohu.com.86400
NSns16.sohu.com.86400
NSns12.sohu.com.86400
NSns14.sohu.com.86400
A219.136.249.83600
MX0 mail.56.com.600
TXT"br5lgl0jfh7djl7zlq0rtmb0tz45h0ft"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, 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.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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