56ck.com

Checked 22 October 2026, 07:33 UTC · via 8.8.8.8
✗Problems found
20 passed 3 warnings 1 failed 7 info

Registration

info

.com generic · Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn) · expires 2028-04-25

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn)
Registered
25 April 2008
Last changed
25 March 2022
Expires
25 April 2028
Status
active
Registry nameservers
dns27.hichina.com, dns28.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 2028-04-25 #3
    The registration is valid until 2028-04-25 (551 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

dns27.hichina.com, dns28.hichina.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns27.hichina.com, dns28.hichina.com
NS in the zone
dns27.hichina.com, dns28.hichina.com
NameserverAddressesNetwork (AS)Glue
dns27.hichina.com139.224.142.99 39.96.153.39 120.76.107.39 120.76.107.59 47.118.199.199 139.224.142.109 39.96.153.59 47.118.199.219 2408:4009:501::35AS37963 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., CN120.76.107.39 120.76.107.59 139.224.142.109 139.224.142.99 2408:4009:501::35 39.96.153.39 39.96.153.59 47.118.199.199 47.118.199.219
dns28.hichina.com47.118.199.221 120.76.107.62 120.76.107.37 39.96.153.37 39.96.153.62 47.118.199.197 139.224.142.107 139.224.142.102 2408:4009:501::36AS37963 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., CN120.76.107.37 120.76.107.62 139.224.142.102 139.224.142.107 2408:4009:501::36 39.96.153.37 39.96.153.62 47.118.199.197 47.118.199.221

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns27.hichina.com, dns28.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

15 of 18 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns27.hichina.com 139.224.142.99no responsenono / no--
dns27.hichina.com 39.96.153.39NOERROR, 137 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 120.76.107.39NOERROR, 218 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 120.76.107.59NOERROR, 207 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 47.118.199.199NOERROR, 225 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 139.224.142.109NOERROR, 174 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 39.96.153.59NOERROR, 142 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 47.118.199.219NOERROR, 198 ms, authoritativenoyes / yesrefused-
dns27.hichina.com 2408:4009:501::35NOERROR, 207 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 47.118.199.221no responsenono / no--
dns28.hichina.com 120.76.107.62NOERROR, 200 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 120.76.107.37NOERROR, 215 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 39.96.153.37NOERROR, 160 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 39.96.153.62no responsenono / no--
dns28.hichina.com 47.118.199.197NOERROR, 173 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 139.224.142.107NOERROR, 199 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 139.224.142.102NOERROR, 184 ms, authoritativenoyes / yesrefused-
dns28.hichina.com 2408:4009:501::36NOERROR, 195 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: dns27.hichina.com (139.224.142.99): read udp 46.225.38.91:57554->139.224.142.99:53: i/o timeout; dns28.hichina.com (47.118.199.221): read udp 46.225.38.91:53347->47.118.199.221:53: i/o timeout; dns28.hichina.com (39.96.153.62): read udp 46.225.38.91:48310->39.96.153.62:53: 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 2026082616 · primary dns27.hichina.com

Found

Primary (MNAME)
dns27.hichina.com
Contact (RNAME)
hostmaster.hichina.com
Serial
2026082616
Refresh / retry
3600 s / 1200 s
Expire
86400 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns27.hichina.com (39.96.153.39)2026082616
dns27.hichina.com (120.76.107.39)2026082617
dns27.hichina.com (120.76.107.59)2026082616
dns27.hichina.com (47.118.199.199)2026082616
dns27.hichina.com (139.224.142.109)2026082509
dns27.hichina.com (39.96.153.59)2026082616
dns27.hichina.com (47.118.199.219)2026082616
dns27.hichina.com (2408:4009:501::35)2026082617
dns28.hichina.com (120.76.107.62)2026082509
dns28.hichina.com (120.76.107.37)2026082617
dns28.hichina.com (39.96.153.37)2026082616
dns28.hichina.com (47.118.199.197)2026082617
dns28.hichina.com (139.224.142.107)2026082509
dns28.hichina.com (139.224.142.102)2026082709
dns28.hichina.com (2408:4009:501::36)2026082616

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2026082509 on dns27.hichina.com (139.224.142.109), dns28.hichina.com (120.76.107.62), dns28.hichina.com (139.224.142.107); 2026082616 on dns27.hichina.com (39.96.153.39), dns27.hichina.com (120.76.107.59), dns27.hichina.com (47.118.199.199), dns27.hichina.com (39.96.153.59), dns27.hichina.com (47.118.199.219), dns28.hichina.com (39.96.153.37), dns28.hichina.com (2408:4009:501::36); 2026082617 on dns27.hichina.com (120.76.107.39), dns27.hichina.com (2408:4009:501::35), dns28.hichina.com (120.76.107.37), dns28.hichina.com (47.118.199.197); 2026082709 on dns28.hichina.com (139.224.142.102). 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 dns27.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 2026082616 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
39.96.153.39:53
TypeValueTTL
SOAdns27.hichina.com. hostmaster.hichina.com. 2026082616 3600 1200 86400 600600
NSdns27.hichina.com.86400
NSdns28.hichina.com.86400
MX10 mxdomain.qq.com.600

Checks

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