shanghufang.com

Checked 22 October 2026, 10:41 UTC · via 8.8.8.8
✗Problems found
22 passed 3 warnings 1 failed 5 info

Registration

info

.com generic · Bizcn.com, Inc. · expires 2027-08-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Bizcn.com, Inc.
Registered
9 August 2019
Last changed
7 August 2026
Expires
9 August 2027
Status
client transfer prohibited
Registry nameservers
ns1.bdydns.cn, ns2.bdydns.cn
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 2027-08-09 #3
    The registration is valid until 2027-08-09 (290 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.bdydns.cn, ns2.bdydns.cn

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.bdydns.cn, ns2.bdydns.cn
NS in the zone
ns1.bdydns.cn, ns2.bdydns.cn
NameserverAddressesNetwork (AS)Glue
ns1.bdydns.cn180.97.36.63 183.232.231.249 240e:940:603:3:0:ff:b05b:137eAS137702 CHINATELECOM-JIANGSU-NANJING-IDC - Nanjing, Jiangsu Province, P.R.China., CN AS56040 CMNET-GuangDong-AP - China Mobile communications corporation, CN AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN-
ns2.bdydns.cn14.215.177.154 119.75.222.53 112.80.248.202 240e:940:603:5:0:ff:b0cf:479bAS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.bdydns.cn, ns2.bdydns.cn.
    #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 240e:940:603::/48, while the other address family is spread over several networks.
    #10
  • ✓ 5 autonomous systems #11
    The nameservers are spread over: AS137702 (CHINATELECOM-JIANGSU-NANJING-IDC - Nanjing, Jiangsu Province, P.R.China., CN): 1 address; AS38365 (Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN): 1 address; AS4134 (CHINANET-BACKBONE - No.31,Jin-rong Street, CN): 3 addresses; AS4837 (CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN): 1 address; AS56040 (CMNET-GuangDong-AP - China Mobile communications corporation, CN): 1 address.
  • i
    All nameserver names under .cn
    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

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.bdydns.cn 180.97.36.63NOERROR, 165 ms, authoritativenono / yesrefused-
ns1.bdydns.cn 183.232.231.249NOERROR, 230 ms, authoritativenono / yesrefused-
ns1.bdydns.cn 240e:940:603:3:0:ff:b05b:137eNOERROR, 180 ms, authoritativenono / yesrefused-
ns2.bdydns.cn 14.215.177.154NOERROR, 204 ms, authoritativenono / yesrefused-
ns2.bdydns.cn 119.75.222.53NOERROR, 152 ms, authoritativenono / yesrefused-
ns2.bdydns.cn 112.80.248.202NOERROR, 262 ms, authoritativenono / yesrefused-
ns2.bdydns.cn 240e:940:603:5:0:ff:b0cf:479bNOERROR, 189 ms, authoritativenono / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.bdydns.cn (180.97.36.63): dial tcp 180.97.36.63:53: i/o timeout; ns1.bdydns.cn (183.232.231.249): dial tcp 183.232.231.249:53: i/o timeout; ns1.bdydns.cn (240e:940:603:3:0:ff:b05b:137e): dial tcp [240e:940:603:3:0:ff:b05b:137e]:53: i/o timeout; ns2.bdydns.cn (14.215.177.154): dial tcp 14.215.177.154:53: i/o timeout; ns2.bdydns.cn (119.75.222.53): dial tcp 119.75.222.53:53: i/o timeout; ns2.bdydns.cn (112.80.248.202): dial tcp 112.80.248.202:53: i/o timeout; ns2.bdydns.cn (240e:940:603:5:0:ff:b0cf:479b): dial tcp [240e:940:603:5:0:ff:b0cf:479b]:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 2018080233 · primary ns1.bdydns.cn

Found

Primary (MNAME)
ns1.bdydns.cn
Contact (RNAME)
sa.dudns.com
Serial
2018080233
Refresh / retry
3600 s / 300 s
Expire
2592000 s
Negative TTL
120 s

Serial per nameserver

NameserverSerial
ns1.bdydns.cn (180.97.36.63)2018080233
ns1.bdydns.cn (183.232.231.249)2018080233
ns1.bdydns.cn (240e:940:603:3:0:ff:b05b:137e)2018080233
ns2.bdydns.cn (14.215.177.154)2018080233
ns2.bdydns.cn (119.75.222.53)2018080233
ns2.bdydns.cn (112.80.248.202)2018080233
ns2.bdydns.cn (240e:940:603:5:0:ff:b0cf:479b)2018080233

Checks

  • ✓ Serial 2018080233 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 2m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1h, retry 5m, expire 30d, negative TTL 2m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.bdydns.cn is one of the listed nameservers.
  • ✓ Contact sa@dudns.com #25
    The SOA RNAME sa.dudns.com means sa@dudns.com.
  • ✓ Date-based serial #26
    The serial 2018080233 follows the YYYYMMDDnn convention (2018-08-02).

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

4 records at the apex

Found

Read from
180.97.36.63:53
TypeValueTTL
SOAns1.bdydns.cn. sa.dudns.com. 2018080233 3600 300 2592000 12086400
NSns1.bdydns.cn.86400
NSns2.bdydns.cn.86400
A122.114.161.1160

Checks

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