jtggtw.com

Checked 22 October 2026, 09:25 UTC · via 8.8.8.8
✗Problems found
20 passed 3 warnings 1 failed 7 info

Registration

info

.com generic · Alibaba Cloud Computing (Beijing) Co., Ltd. · expires 2029-05-14

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered
14 May 2019
Last changed
15 May 2026
Expires
14 May 2029
Status
active
Registry nameservers
dns13.hichina.com, dns14.hichina.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 2029-05-14 #3
    The registration is valid until 2029-05-14 (934 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

dns13.hichina.com, dns14.hichina.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns13.hichina.com, dns14.hichina.com
NS in the zone
dns13.hichina.com, dns14.hichina.com
NameserverAddressesNetwork (AS)Glue
dns13.hichina.com47.118.199.202 47.118.199.212 139.224.142.112 120.76.107.52 120.76.107.42 139.224.142.122 39.96.153.52 39.96.153.42 2408:4009:501::21AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN120.76.107.42 120.76.107.52 139.224.142.112 139.224.142.122 2408:4009:501::21 39.96.153.42 39.96.153.52 47.118.199.202 47.118.199.212
dns14.hichina.com47.118.199.211 47.118.199.201 39.96.153.51 120.76.107.41 120.76.107.51 139.224.142.121 139.224.142.111 39.96.153.41 2408:4009:501::22AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN120.76.107.41 120.76.107.51 139.224.142.111 139.224.142.121 2408:4009:501::22 39.96.153.41 39.96.153.51 47.118.199.201 47.118.199.211

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns13.hichina.com, dns14.hichina.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.
  • i
    One address family in one network
    all IPv6 addresses are in 2408:4009:501::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS37963 (ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN): 18 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

fail

16 of 18 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns13.hichina.com 47.118.199.202no responsenono / no--
dns13.hichina.com 47.118.199.212NOERROR, 230 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 139.224.142.112NOERROR, 175 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 120.76.107.52NOERROR, 206 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 120.76.107.42NOERROR, 208 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 139.224.142.122NOERROR, 189 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 39.96.153.52NOERROR, 174 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 39.96.153.42NOERROR, 148 ms, authoritativenoyes / yesrefused-
dns13.hichina.com 2408:4009:501::21no responsenono / no--
dns14.hichina.com 47.118.199.211NOERROR, 231 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 47.118.199.201NOERROR, 209 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 39.96.153.51NOERROR, 170 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 120.76.107.41NOERROR, 197 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 120.76.107.51NOERROR, 205 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 139.224.142.121NOERROR, 173 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 139.224.142.111NOERROR, 181 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 39.96.153.41NOERROR, 139 ms, authoritativenoyes / yesrefused-
dns14.hichina.com 2408:4009:501::22NOERROR, 195 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: dns13.hichina.com (47.118.199.202): read udp 46.225.38.91:50030->47.118.199.202:53: i/o timeout; dns13.hichina.com (2408:4009:501::21): read udp [2a01:4f8:1c1c:eebf::1]:50727->[2408:4009:501::21]: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 2026082617 · primary dns13.hichina.com

Found

Primary (MNAME)
dns13.hichina.com
Contact (RNAME)
hostmaster.hichina.com
Serial
2026082617
Refresh / retry
3600 s / 1200 s
Expire
86400 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns13.hichina.com (47.118.199.212)2026082617
dns13.hichina.com (139.224.142.112)2019051414
dns13.hichina.com (120.76.107.52)2026082616
dns13.hichina.com (120.76.107.42)2026081813
dns13.hichina.com (139.224.142.122)2026082509
dns13.hichina.com (39.96.153.52)2026082617
dns13.hichina.com (39.96.153.42)2026082616
dns14.hichina.com (47.118.199.211)2026082815
dns14.hichina.com (47.118.199.201)2026082616
dns14.hichina.com (39.96.153.51)2026082617
dns14.hichina.com (120.76.107.41)2026081813
dns14.hichina.com (120.76.107.51)2026082509
dns14.hichina.com (139.224.142.121)2026082616
dns14.hichina.com (139.224.142.111)2019051414
dns14.hichina.com (39.96.153.41)2026082616
dns14.hichina.com (2408:4009:501::22)2026082616

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2019051414 on dns13.hichina.com (139.224.142.112), dns14.hichina.com (139.224.142.111); 2026081813 on dns13.hichina.com (120.76.107.42), dns14.hichina.com (120.76.107.41); 2026082509 on dns13.hichina.com (139.224.142.122), dns14.hichina.com (120.76.107.51); 2026082616 on dns13.hichina.com (120.76.107.52), dns13.hichina.com (39.96.153.42), dns14.hichina.com (47.118.199.201), dns14.hichina.com (139.224.142.121), dns14.hichina.com (39.96.153.41), dns14.hichina.com (2408:4009:501::22); 2026082617 on dns13.hichina.com (47.118.199.212), dns13.hichina.com (39.96.153.52), dns14.hichina.com (39.96.153.51); 2026082815 on dns14.hichina.com (47.118.199.211). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • !
    Unusual SOA timers
    expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 1h, retry 20m, expire 1d, negative TTL 10m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns13.hichina.com is one of the listed nameservers.
  • ✓ Contact hostmaster@hichina.com #25
    The SOA RNAME hostmaster.hichina.com means hostmaster@hichina.com.
  • ✓ Date-based serial #26
    The serial 2026082617 follows the YYYYMMDDnn convention (2026-08-26).

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

info

4 records at the apex

Found

Read from
47.118.199.212:53
TypeValueTTL
SOAdns13.hichina.com. hostmaster.hichina.com. 2026082616 3600 1200 86400 600600
NSdns13.hichina.com.86400
NSdns14.hichina.com.86400
A8.145.41.191600

Checks

  • ✓ TTLs within range #32
    TTLs: A 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.
  • ✓ 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