unibestzs.com

Checked 22 October 2026, 11:15 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · Xiamen ChinaSource Internet Service Co., Ltd · expires 2030-06-22

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Xiamen ChinaSource Internet Service Co., Ltd
Registered
22 June 2007
Last changed
18 April 2024
Expires
22 June 2030
Status
client transfer prohibited
Registry nameservers
ns1.cnolnic.com, ns2.cnolnic.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 2030-06-22 #3
    The registration is valid until 2030-06-22 (1338 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.cnolnic.com, ns2.cnolnic.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.cnolnic.com, ns2.cnolnic.com
NS in the zone
ns1.cnolnic.com, ns2.cnolnic.com
NameserverAddressesNetwork (AS)Glue
ns1.cnolnic.com180.76.132.118 106.12.41.178 240c:4081:8000:1702::4AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN106.12.41.178 180.76.132.118 240c:4081:8000:1702::4
ns2.cnolnic.com182.61.7.241 106.12.205.190 240c:4082:0:5d80::3AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN AS38365 Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN106.12.205.190 182.61.7.241 240c:4082:0:5d80::3

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.cnolnic.com, ns2.cnolnic.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 4 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS38365 (Baidu - Beijing Baidu Netcom Science and Technology Co., Ltd., CN): 6 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

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.cnolnic.com 180.76.132.118NOERROR, 149 ms, authoritativenoyes / yesrefusedChinaSource 4.0.0
ns1.cnolnic.com 106.12.41.178NOERROR, 225 ms, authoritativenoyes / yesrefusedChinaSource 4.0.0
ns1.cnolnic.com 240c:4081:8000:1702::4NOERROR, 151 ms, authoritativenoyes / yesrefusedChinaSource 4.0.0
ns2.cnolnic.com 182.61.7.241NOERROR, 212 ms, authoritativenoyes / yesrefusedChinaSource 4.0.0
ns2.cnolnic.com 106.12.205.190NOERROR, 159 ms, authoritativenoyes / yesrefusedChinaSource 4.0.0
ns2.cnolnic.com 240c:4082:0:5d80::3NOERROR, 153 ms, authoritativenoyes / yesrefusedChinaSource 4.0.0

Checks

  • ✓ All respond #14
    All 6 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: ns1.cnolnic.com: "ChinaSource 4.0.0"; ns2.cnolnic.com: "ChinaSource 4.0.0". 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

pass

serial 2006112401 · primary ns1.cnolnic.com

Found

Primary (MNAME)
ns1.cnolnic.com
Contact (RNAME)
root.cnolnic.net
Serial
2006112401
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.cnolnic.com (180.76.132.118)2006112401
ns1.cnolnic.com (106.12.41.178)2006112401
ns1.cnolnic.com (240c:4081:8000:1702::4)2006112401
ns2.cnolnic.com (182.61.7.241)2006112401
ns2.cnolnic.com (106.12.205.190)2006112401
ns2.cnolnic.com (240c:4082:0:5d80::3)2006112401

Checks

  • ✓ Serial 2006112401 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.cnolnic.com is one of the listed nameservers.
  • ✓ Contact root@cnolnic.net #25
    The SOA RNAME root.cnolnic.net means root@cnolnic.net.
  • ✓ Date-based serial #26
    The serial 2006112401 follows the YYYYMMDDnn convention (2006-11-24).

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

4 records at the apex

Found

Read from
180.76.132.118:53
TypeValueTTL
SOAns1.cnolnic.com. root.cnolnic.net. 2006112401 10800 3600 604800 864007200
NSns1.cnolnic.com.7200
NSns2.cnolnic.com.7200
TXT"v=spf1 include:spf.chinaemail.cn -all"7200

Checks

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