bdimg.com

Checked 22 October 2026, 07:53 UTC · via 8.8.8.8
!Passed with warnings
23 passed 3 warnings 0 failed 5 info

Registration

info

.com generic · Key-Systems GmbH · expires 2027-03-22

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Key-Systems GmbH
Registered
22 March 2010
Last changed
18 February 2026
Expires
22 March 2027
Status
client transfer prohibited
Registry nameservers
dns.baidu.com, ns2.baidu.com, ns3.baidu.com, ns4.baidu.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 2027-03-22 #3
    The registration is valid until 2027-03-22 (151 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

dns.baidu.com, ns2.baidu.com, ns3.baidu.com, ns4.baidu.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns.baidu.com, ns2.baidu.com, ns3.baidu.com, ns4.baidu.com
NS in the zone
dns.baidu.com, ns2.baidu.com, ns3.baidu.com, ns4.baidu.com
NameserverAddressesNetwork (AS)Glue
dns.baidu.com110.242.68.134 240e:bf:b801:1002:0:ff:b024:26deAS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN AS134768 CHINANET-SHAANXI-CLOUD-BASE - CHINANET SHAANXI province Cloud Base network, CN110.242.68.134 240e:bf:b801:1002:0:ff:b024:26de
ns2.baidu.com220.181.33.31 240e:940:603:4:0:ff:b01b:589aAS23724 CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN220.181.33.31 240e:940:603:4:0:ff:b01b:589a
ns3.baidu.com36.155.132.78 153.3.238.93AS56046 CMNET-Jiangsu-AP - China Mobile communications corporation, CN AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN153.3.238.93 36.155.132.78
ns4.baidu.com14.215.178.80 111.45.3.226AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN AS56040 CMNET-GuangDong-AP - China Mobile communications corporation, CN111.45.3.226 14.215.178.80

Checks

  • ✓ 4 nameservers #6
    Delegated to dns.baidu.com, ns2.baidu.com, ns3.baidu.com, ns4.baidu.com.
  • ✓ 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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 6 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 6 autonomous systems #11
    The nameservers are spread over: AS134768 (CHINANET-SHAANXI-CLOUD-BASE - CHINANET SHAANXI province Cloud Base network, CN): 1 address; AS23724 (CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN): 1 address; AS4134 (CHINANET-BACKBONE - No.31,Jin-rong Street, CN): 2 addresses; AS4837 (CHINA169-Backbone - CHINA UNICOM China169 Backbone, CN): 2 addresses; AS56040 (CMNET-GuangDong-AP - China Mobile communications corporation, CN): 1 address; AS56046 (CMNET-Jiangsu-AP - China Mobile communications corporation, CN): 1 address.
  • 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns3.baidu.com, ns4.baidu.com.
    #13

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.baidu.com 110.242.68.134NOERROR, 245 ms, authoritativenoyes / yesrefused-
dns.baidu.com 240e:bf:b801:1002:0:ff:b024:26deNOERROR, 161 ms, authoritativenoyes / yesrefusedbaidu dns
ns2.baidu.com 220.181.33.31NOERROR, 146 ms, authoritativenoyes / yesrefusedbaidu dns
ns2.baidu.com 240e:940:603:4:0:ff:b01b:589aNOERROR, 203 ms, authoritativenoyes / yesrefusedbaidu dns
ns3.baidu.com 36.155.132.78NOERROR, 201 ms, authoritativenoyes / norefused-
ns3.baidu.com 153.3.238.93NOERROR, 214 ms, authoritativenoyes / yesrefusedbaidu dns
ns4.baidu.com 14.215.178.80NOERROR, 175 ms, authoritativenoyes / yesrefusedbaidu dns
ns4.baidu.com 111.45.3.226NOERROR, 210 ms, authoritativenoyes / yesrefusedbaidu dns

Checks

  • ✓ All respond #14
    All 8 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns.baidu.com: "baidu dns"; ns2.baidu.com: "baidu dns"; ns3.baidu.com: "baidu dns"; ns4.baidu.com: "baidu dns".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • !
    No EDNS
    These nameservers don't support EDNS(0), needed for DNSSEC and answers larger than 512 bytes: ns3.baidu.com (36.155.132.78).
    #20
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 2012101735 · primary dns.baidu.com

Found

Primary (MNAME)
dns.baidu.com
Contact (RNAME)
sa.baidu.com
Serial
2012101735
Refresh / retry
300 s / 300 s
Expire
2592000 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
dns.baidu.com (110.242.68.134)2012101735
dns.baidu.com (240e:bf:b801:1002:0:ff:b024:26de)2012101735
ns2.baidu.com (220.181.33.31)2012101735
ns2.baidu.com (240e:940:603:4:0:ff:b01b:589a)2012101735
ns3.baidu.com (36.155.132.78)2012101735
ns3.baidu.com (153.3.238.93)2012101735
ns4.baidu.com (14.215.178.80)2012101735
ns4.baidu.com (111.45.3.226)2012101735

Checks

  • ✓ Serial 2012101735 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 5m is outside 20m–1d; retry 5m should be shorter than refresh 5m. Current values: refresh 5m, retry 5m, expire 30d, negative TTL 2h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns.baidu.com is one of the listed nameservers.
  • ✓ Contact sa@baidu.com #25
    The SOA RNAME sa.baidu.com means sa@baidu.com.
  • ✓ Date-based serial #26
    The serial 2012101735 follows the YYYYMMDDnn convention (2012-10-17).

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

8 records at the apex

Found

Read from
110.242.68.134:53
TypeValueTTL
SOAdns.baidu.com. sa.baidu.com. 2012101735 300 300 2592000 72007200
NSns2.baidu.com.86411
NSns3.baidu.com.86411
NSns4.baidu.com.86411
NSdns.baidu.com.86411
A39.156.70.377200
A220.181.7.2037200
TXT"_globalsign-domain-verification=08uep9uJF_ZfuizcocVbfOMLCpgCQYSh-6th82foUS"7200

Checks

  • ✓ TTLs within range #32
    TTLs: A 2h, NS 24h0m11s. The NS TTL at the parent is 2d and in the zone 24h0m11s; 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