sina.com

Checked 22 October 2026, 10:43 UTC · via 8.8.8.8
!Passed with warnings
24 passed 5 warnings 0 failed 2 info

Registration

info

.com generic · Xin Net Technology Corporation · expires 2028-09-15

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Xin Net Technology Corporation
Registered
16 September 1998
Last changed
29 December 2025
Expires
15 September 2028
Status
client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns1.sina.com, ns1.sina.com.cn, ns2.sina.com, ns2.sina.com.cn, ns3.sina.com, ns3.sina.com.cn, ns4.sina.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 2028-09-15 #3
    The registration is valid until 2028-09-15 (693 days).
  • ✓ Transfer locked #4
    Registry status: 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

ns1.sina.com, ns1.sina.com.cn, ns2.sina.com, ns2.sina.com.cn, ns3.sina.com, ns3.sina.com.cn, ns4.sina.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.sina.com, ns1.sina.com.cn, ns2.sina.com, ns2.sina.com.cn, ns3.sina.com, ns3.sina.com.cn, ns4.sina.com
NS in the zone
ns1.sina.com, ns1.sina.com.cn, ns2.sina.com, ns2.sina.com.cn, ns3.sina.com, ns3.sina.com.cn, ns4.sina.com, ns4.sina.com.cn
NameserverAddressesNetwork (AS)Glue
ns1.sina.com114.134.80.137AS9304 HUTCHISON-AS-AP - HGC Global Communications Limited, HK114.134.80.137
ns1.sina.com.cn221.179.193.14AS9808 CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN-
ns2.sina.com114.134.80.165AS9304 HUTCHISON-AS-AP - HGC Global Communications Limited, HK114.134.80.165
ns2.sina.com.cn180.149.138.199AS23724 CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN-
ns3.sina.com180.149.138.199AS23724 CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN180.149.138.199
ns3.sina.com.cn123.125.29.99AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN-
ns4.sina.com123.125.29.99AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN123.125.29.99
ns4.sina.com.cn (zone only)183.2.215.53AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN-

Checks

  • ✓ 7 nameservers #6
    Delegated to ns1.sina.com, ns1.sina.com.cn, ns2.sina.com, ns2.sina.com.cn, ns3.sina.com, ns3.sina.com.cn, ns4.sina.com.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ns4.sina.com.cn. ns1.sina.com, ns1.sina.com.cn, ns2.sina.com, ns2.sina.com.cn, ns3.sina.com, ns3.sina.com.cn, ns4.sina.com, ns4.sina.com.cn report NS ns1.sina.com ns1.sina.com.cn ns2.sina.com ns2.sina.com.cn ns3.sina.com ns3.sina.com.cn ns4.sina.com ns4.sina.com.cn.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.sina.com, ns2.sina.com, ns3.sina.com, ns4.sina.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 5 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 5 autonomous systems #11
    The nameservers are spread over: AS23724 (CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN): 2 addresses; AS4134 (CHINANET-BACKBONE - No.31,Jin-rong Street, CN): 1 address; AS4837 (CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN): 2 addresses; AS9304 (HUTCHISON-AS-AP - HGC Global Communications Limited, HK): 2 addresses; AS9808 (CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN): 1 address.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .cn, .com.
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.sina.com 114.134.80.137NOERROR, 202 ms, authoritativenoyes / yesrefused-
ns1.sina.com.cn 221.179.193.14NOERROR, 131 ms, authoritativenoyes / yesrefused-
ns2.sina.com 114.134.80.165NOERROR, 196 ms, authoritativenoyes / yesrefused-
ns2.sina.com.cn 180.149.138.199NOERROR, 155 ms, authoritativenoyes / yesrefused-
ns3.sina.com 180.149.138.199NOERROR, 144 ms, authoritativenoyes / yesrefused-
ns3.sina.com.cn 123.125.29.99NOERROR, 131 ms, authoritativenoyes / yesrefused-
ns4.sina.com 123.125.29.99NOERROR, 243 ms, authoritativenoyes / yesrefused-
ns4.sina.com.cn 183.2.215.53NOERROR, 203 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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

warn

serial 2005042601 · primary ns1.sina.com.cn

Found

Primary (MNAME)
ns1.sina.com.cn
Contact (RNAME)
zhihao.staff.sina.com.cn
Serial
2005042601
Refresh / retry
900 s / 300 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.sina.com (114.134.80.137)2005042601
ns1.sina.com.cn (221.179.193.14)2005042601
ns2.sina.com (114.134.80.165)2005042601
ns2.sina.com.cn (180.149.138.199)2005042601
ns3.sina.com (180.149.138.199)2005042601
ns3.sina.com.cn (123.125.29.99)2005042601
ns4.sina.com (123.125.29.99)2005042601
ns4.sina.com.cn (183.2.215.53)2005042601

Checks

  • ✓ Serial 2005042601 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d. Current values: refresh 15m, retry 5m, expire 7d, negative TTL 5m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.sina.com.cn is one of the listed nameservers.
  • ✓ Contact zhihao@staff.sina.com.cn #25
    The SOA RNAME zhihao.staff.sina.com.cn means zhihao@staff.sina.com.cn.
  • ✓ Date-based serial #26
    The serial 2005042601 follows the YYYYMMDDnn convention (2005-04-26).

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

warn

14 records at the apex

Found

Read from
114.134.80.137:53
TypeValueTTL
SOAns1.sina.com.cn. zhihao.staff.sina.com.cn. 2005042601 900 300 604800 300300
NSns1.sina.com.cn.86400
NSns4.sina.com.86400
NSns3.sina.com.86400
NSns3.sina.com.cn.86400
NSns2.sina.com.86400
NSns4.sina.com.cn.86400
NSns1.sina.com.86400
NSns2.sina.com.cn.86400
A64.71.151.1160
MX10 freemx3.sinamail.sina.com.cn.60
MX10 freemx2.sinamail.sina.com.cn.60
MX10 freemx1.sinamail.sina.com.cn.60
TXT"v=spf1 include:spf.sinamail.sina.com.cn -all"60

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m). 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