wenjuan.com

Checked 22 October 2026, 11:30 UTC · via 8.8.8.8
✗Problems found
21 passed 3 warnings 1 failed 6 info

Registration

info

.com generic · Alibaba Cloud Computing (Beijing) Co., Ltd. · expires 2027-04-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered
9 April 2003
Last changed
27 March 2026
Expires
9 April 2027
Status
active
Registry nameservers
ns3.dnsv2.com, ns4.dnsv2.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 2027-04-09 #3
    The registration is valid until 2027-04-09 (169 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

ns3.dnsv2.com, ns4.dnsv2.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns3.dnsv2.com, ns4.dnsv2.com
NS in the zone
ns3.dnsv2.com, ns4.dnsv2.com
NameserverAddressesNetwork (AS)Glue
ns3.dnsv2.com117.135.128.155 163.177.5.55 111.13.203.55 1.12.0.29 1.13.76.55 220.196.136.55 125.94.59.155 2402:4e00:1470:2::12AS9808 CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN AS136958 UNICOM-GuangZhou-IDC - China Unicom Guangdong IP network, CN AS9808 CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN AS17621 CNCGROUP-SH - China Unicom Shanghai network, CN AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street, CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN1.12.0.29 1.13.76.55 111.13.203.55 117.135.128.155 125.94.59.155 163.177.5.55 220.196.136.55 2402:4e00:1470:2::12
ns4.dnsv2.com101.227.168.55 1.12.0.30 49.7.107.155 124.64.205.155 1.14.119.55 36.155.149.55 2402:4e00:111:fff::fAS4811 CHINANET-SHANGHAI-MAN - China Telecom (Group), CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN AS23724 CHINANET-IDC-BJ-AP - IDC, China Telecommunications Corporation, CN AS4808 CHINA169-BJ - China Unicom Beijing Province Network, CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN AS56046 CMNET-Jiangsu-AP - China Mobile communications corporation, CN AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN1.12.0.30 1.14.119.55 101.227.168.55 124.64.205.155 2402:4e00:111:fff::f 36.155.149.55 49.7.107.155

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns3.dnsv2.com, ns4.dnsv2.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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 12 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 9 autonomous systems #11
    The nameservers are spread over: AS136958 (UNICOM-GuangZhou-IDC - China Unicom Guangdong IP network, CN): 1 address; AS17621 (CNCGROUP-SH - China Unicom Shanghai 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): 1 address; AS45090 (TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited, CN): 6 addresses; AS4808 (CHINA169-BJ - China Unicom Beijing Province Network, CN): 1 address; AS4811 (CHINANET-SHANGHAI-MAN - China Telecom (Group), CN): 1 address; AS56046 (CMNET-Jiangsu-AP - China Mobile communications corporation, CN): 1 address; AS9808 (CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd., CN): 2 addresses.
  • 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

warn

15 of 15 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns3.dnsv2.com 117.135.128.155NOERROR, 234 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 163.177.5.55NOERROR, 188 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 111.13.203.55NOERROR, 123 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 1.12.0.29NOERROR, 3 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 1.13.76.55NOERROR, 208 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 220.196.136.55NOERROR, 218 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 125.94.59.155NOERROR, 200 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns3.dnsv2.com 2402:4e00:1470:2::12NOERROR, 195 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns4.dnsv2.com 101.227.168.55NOERROR, 203 ms, authoritativenoyes / yesrefused-
ns4.dnsv2.com 1.12.0.30NOERROR, 5 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns4.dnsv2.com 49.7.107.155NOERROR, 160 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns4.dnsv2.com 124.64.205.155NOERROR, 135 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns4.dnsv2.com 1.14.119.55NOERROR, 208 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns4.dnsv2.com 36.155.149.55NOERROR, 248 ms, authoritativenoyes / yesrefusedDNSPod AUTHORITY DNS 7.3.2512.01
ns4.dnsv2.com 2402:4e00:111:fff::fNOERROR, 207 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 15 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns3.dnsv2.com: "DNSPod AUTHORITY DNS 7.3.2512.01"; ns4.dnsv2.com: "DNSPod AUTHORITY DNS 7.3.2512.01". Hide or replace the version string.
    #17
  • ✓ 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 1791452513 · primary ns3.dnsv2.com

Found

Primary (MNAME)
ns3.dnsv2.com
Contact (RNAME)
level3dnsadmin.dnspod.com
Serial
1791452513
Refresh / retry
3600 s / 180 s
Expire
1209600 s
Negative TTL
180 s

Serial per nameserver

NameserverSerial
ns3.dnsv2.com (117.135.128.155)1791452513
ns3.dnsv2.com (163.177.5.55)1791452513
ns3.dnsv2.com (111.13.203.55)1791452513
ns3.dnsv2.com (1.12.0.29)1791452513
ns3.dnsv2.com (1.13.76.55)1791452513
ns3.dnsv2.com (220.196.136.55)1791452513
ns3.dnsv2.com (125.94.59.155)1791452513
ns3.dnsv2.com (2402:4e00:1470:2::12)1791452513
ns4.dnsv2.com (101.227.168.55)1791452513
ns4.dnsv2.com (1.12.0.30)1791452513
ns4.dnsv2.com (49.7.107.155)1791452513
ns4.dnsv2.com (124.64.205.155)1791452513
ns4.dnsv2.com (1.14.119.55)1791452513
ns4.dnsv2.com (36.155.149.55)1791452513
ns4.dnsv2.com (2402:4e00:111:fff::f)1791452513

Checks

  • ✓ Serial 1791452513 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 3m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1h, retry 3m, expire 14d, negative TTL 3m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns3.dnsv2.com is one of the listed nameservers.
  • ✓ Contact level3dnsadmin@dnspod.com #25
    The SOA RNAME level3dnsadmin.dnspod.com means level3dnsadmin@dnspod.com.
  • ✓ Timestamp serial #26
    The serial 1791452513 is a Unix timestamp (2026-10-08 09:41 UTC).

DNSSEC

info

Not signed

Found

Validated by resolver
no
Lookup error: read udp 46.225.38.91:47158->117.135.128.155:53: i/o timeout

Checks

  • i
    Could not be checked
    The DNSSEC lookup failed, so this could not be checked: read udp 46.225.38.91:47158->117.135.128.155:53: i/o timeout
    #27

Records

fail

9 records at the apex

Found

Read from
117.135.128.155:53
TypeValueTTL
SOAns3.dnsv2.com. level3dnsadmin.dnspod.com. 1791452513 3600 180 1209600 180180
NSns4.dnsv2.com.86400
NSns3.dnsv2.com.86400
A121.4.25.13960
MX5 mxbiz1.qq.com.600
MX10 mxbiz2.qq.com.600
TXT"bca50b74-24e0-49ba-a769-c804339362cc-1438338486307"600
TXT"qh3mfckx99qhh7f1xd05sm0zn29nvnvy"600
TXT"v=spf1 include:spf.mail.qq.com ~all"600

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
  • ✗
    CNAME at the apex
    The zone apex is a CNAME to lb-i7f9hy3x-pmvgaizq891o3ld5.clb.ap-shanghai.tencentclb.com. A CNAME can't coexist with the SOA and NS records (RFC 1034); use your provider's ALIAS/flattening feature instead.
    #33
  • ✓ 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