usensejn.com

Checked 22 October 2026, 11:16 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 warnings 0 failed 7 info

Registration

info

.com generic · Alibaba Cloud Computing (Beijing) Co., Ltd. · expires 2027-05-24

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered
24 May 2013
Last changed
10 July 2026
Expires
24 May 2027
Status
active
Registry nameservers
dns17.hichina.com, dns18.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 2027-05-24 #3
    The registration is valid until 2027-05-24 (213 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

dns17.hichina.com, dns18.hichina.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns17.hichina.com, dns18.hichina.com
NS in the zone
dns17.hichina.com, dns18.hichina.com
NameserverAddressesNetwork (AS)Glue
dns17.hichina.com47.118.199.220 47.118.199.200 39.96.153.40 139.224.142.100 120.76.107.40 120.76.107.60 39.96.153.60 139.224.142.110 2408:4009:501::25AS37963 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., CN120.76.107.40 120.76.107.60 139.224.142.100 139.224.142.110 2408:4009:501::25 39.96.153.40 39.96.153.60 47.118.199.200 47.118.199.220
dns18.hichina.com139.224.142.98 47.118.199.222 120.76.107.38 39.96.153.61 120.76.107.61 139.224.142.108 47.118.199.198 39.96.153.38 2408:4009:501::26AS37963 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., CN120.76.107.38 120.76.107.61 139.224.142.108 139.224.142.98 2408:4009:501::26 39.96.153.38 39.96.153.61 47.118.199.198 47.118.199.222

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns17.hichina.com, dns18.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

pass

18 of 18 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns17.hichina.com 47.118.199.220NOERROR, 204 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 47.118.199.200NOERROR, 209 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 39.96.153.40NOERROR, 158 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 139.224.142.100NOERROR, 176 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 120.76.107.40NOERROR, 211 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 120.76.107.60NOERROR, 198 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 39.96.153.60NOERROR, 153 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 139.224.142.110NOERROR, 220 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 2408:4009:501::25NOERROR, 205 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 139.224.142.98NOERROR, 175 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 47.118.199.222NOERROR, 202 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 120.76.107.38NOERROR, 211 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 39.96.153.61NOERROR, 146 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 120.76.107.61NOERROR, 209 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 139.224.142.108NOERROR, 180 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 47.118.199.198NOERROR, 225 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 39.96.153.38NOERROR, 162 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 2408:4009:501::26NOERROR, 222 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 18 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 2026082617 · primary dns17.hichina.com

Found

Primary (MNAME)
dns17.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
dns17.hichina.com (47.118.199.220)2026082617
dns17.hichina.com (47.118.199.200)2026082617
dns17.hichina.com (39.96.153.40)2026082617
dns17.hichina.com (139.224.142.100)2026082616
dns17.hichina.com (120.76.107.40)2026081813
dns17.hichina.com (120.76.107.60)2026082616
dns17.hichina.com (39.96.153.60)2026082616
dns17.hichina.com (139.224.142.110)2026082616
dns17.hichina.com (2408:4009:501::25)2026082617
dns18.hichina.com (139.224.142.98)2026082709
dns18.hichina.com (47.118.199.222)2026082616
dns18.hichina.com (120.76.107.38)2026082509
dns18.hichina.com (39.96.153.61)2026082616
dns18.hichina.com (120.76.107.61)2026082509
dns18.hichina.com (139.224.142.108)2026082509
dns18.hichina.com (47.118.199.198)2026082616
dns18.hichina.com (39.96.153.38)2026082617
dns18.hichina.com (2408:4009:501::26)2026082509

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2026081813 on dns17.hichina.com (120.76.107.40); 2026082509 on dns18.hichina.com (120.76.107.38), dns18.hichina.com (120.76.107.61), dns18.hichina.com (139.224.142.108), dns18.hichina.com (2408:4009:501::26); 2026082616 on dns17.hichina.com (139.224.142.100), dns17.hichina.com (120.76.107.60), dns17.hichina.com (39.96.153.60), dns17.hichina.com (139.224.142.110), dns18.hichina.com (47.118.199.222), dns18.hichina.com (39.96.153.61), dns18.hichina.com (47.118.199.198); 2026082617 on dns17.hichina.com (47.118.199.220), dns17.hichina.com (47.118.199.200), dns17.hichina.com (39.96.153.40), dns17.hichina.com (2408:4009:501::25), dns18.hichina.com (39.96.153.38); 2026082709 on dns18.hichina.com (139.224.142.98). 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 dns17.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

3 records at the apex

Found

Read from
47.118.199.220:53
TypeValueTTL
SOAdns17.hichina.com. hostmaster.hichina.com. 2026082617 3600 1200 86400 600600
NSdns18.hichina.com.86400
NSdns17.hichina.com.86400

Checks

  • ✓ TTLs within range #32
    TTLs: 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