iosqr.com

Checked 22 October 2026, 09:21 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 2027-08-08

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered
8 August 2013
Last changed
10 August 2026
Expires
8 August 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 2027-08-08 #3
    The registration is valid until 2027-08-08 (290 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.com139.224.142.100 139.224.142.110 39.96.153.60 47.118.199.220 47.118.199.200 120.76.107.40 120.76.107.60 39.96.153.40 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.com120.76.107.61 139.224.142.108 139.224.142.98 39.96.153.61 47.118.199.198 47.118.199.222 39.96.153.38 120.76.107.38 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

fail

16 of 18 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns17.hichina.com 139.224.142.100NOERROR, 171 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 139.224.142.110NOERROR, 203 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 39.96.153.60NOERROR, 160 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 47.118.199.220NOERROR, 195 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 47.118.199.200NOERROR, 235 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 120.76.107.40no responsenono / no--
dns17.hichina.com 120.76.107.60no responsenono / no--
dns17.hichina.com 39.96.153.40NOERROR, 153 ms, authoritativenoyes / yesrefused-
dns17.hichina.com 2408:4009:501::25NOERROR, 189 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 120.76.107.61NOERROR, 209 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 139.224.142.108NOERROR, 183 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 139.224.142.98NOERROR, 210 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 39.96.153.61NOERROR, 152 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 47.118.199.198NOERROR, 202 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 47.118.199.222NOERROR, 187 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 39.96.153.38NOERROR, 218 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 120.76.107.38NOERROR, 199 ms, authoritativenoyes / yesrefused-
dns18.hichina.com 2408:4009:501::26NOERROR, 221 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: dns17.hichina.com (120.76.107.40): read udp 46.225.38.91:34930->120.76.107.40:53: i/o timeout; dns17.hichina.com (120.76.107.60): read udp 46.225.38.91:38986->120.76.107.60:53: 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 dns17.hichina.com

Found

Primary (MNAME)
dns17.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
dns17.hichina.com (139.224.142.100)2026082616
dns17.hichina.com (139.224.142.110)2013091814
dns17.hichina.com (39.96.153.60)2026082616
dns17.hichina.com (47.118.199.220)2026082616
dns17.hichina.com (47.118.199.200)2026082617
dns17.hichina.com (39.96.153.40)2026082616
dns17.hichina.com (2408:4009:501::25)2026082616
dns18.hichina.com (120.76.107.61)2026082617
dns18.hichina.com (139.224.142.108)2026082509
dns18.hichina.com (139.224.142.98)2026082709
dns18.hichina.com (39.96.153.61)2026082616
dns18.hichina.com (47.118.199.198)2026082815
dns18.hichina.com (47.118.199.222)2026082815
dns18.hichina.com (39.96.153.38)2026082616
dns18.hichina.com (120.76.107.38)2026081813
dns18.hichina.com (2408:4009:501::26)2026082617

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2013091814 on dns17.hichina.com (139.224.142.110); 2026081813 on dns18.hichina.com (120.76.107.38); 2026082509 on dns18.hichina.com (139.224.142.108); 2026082616 on dns17.hichina.com (139.224.142.100), dns17.hichina.com (39.96.153.60), dns17.hichina.com (47.118.199.220), dns17.hichina.com (39.96.153.40), dns17.hichina.com (2408:4009:501::25), dns18.hichina.com (39.96.153.61), dns18.hichina.com (39.96.153.38); 2026082617 on dns17.hichina.com (47.118.199.200), dns18.hichina.com (120.76.107.61), dns18.hichina.com (2408:4009:501::26); 2026082709 on dns18.hichina.com (139.224.142.98); 2026082815 on dns18.hichina.com (47.118.199.198), dns18.hichina.com (47.118.199.222). 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 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

7 records at the apex

Found

Read from
139.224.142.100:53
TypeValueTTL
SOAdns17.hichina.com. hostmaster.hichina.com. 2026082509 3600 1200 86400 600600
NSdns17.hichina.com.86400
NSdns18.hichina.com.86400
A139.196.108.92600
MX5 mxn.mxhichina.com.600
MX10 mxw.mxhichina.com.600
TXT"TXT"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.
  • ✓ 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