kobobooks.com

Checked 22 October 2026, 09:32 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · Instra Corporation Pty Ltd. · expires 2027-08-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Instra Corporation Pty Ltd.
Registered
6 August 2009
Last changed
21 July 2026
Expires
6 August 2027
Status
client transfer prohibited
Registry nameservers
ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.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 2027-08-06 #3
    The registration is valid until 2027-08-06 (288 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

ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.com
NS in the zone
ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.com
NameserverAddressesNetwork (AS)Glue
ns-cloud-a1.googledomains.com216.239.32.106 2001:4860:4802:32::6aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:32::6a 216.239.32.106
ns-cloud-a2.googledomains.com216.239.34.106 2001:4860:4802:34::6aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:34::6a 216.239.34.106
ns-cloud-a3.googledomains.com216.239.36.106 2001:4860:4802:36::6aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:36::6a 216.239.36.106
ns-cloud-a4.googledomains.com216.239.38.106 2001:4860:4802:38::6aAS15169 GOOGLE - Google LLC, US AS15169 GOOGLE - Google LLC, US2001:4860:4802:38::6a 216.239.38.106

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:4860:4802::/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 (AS15169 (GOOGLE - Google LLC, US): 8 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

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-cloud-a1.googledomains.com 216.239.32.106NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns-cloud-a1.googledomains.com 2001:4860:4802:32::6aNOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-a2.googledomains.com 216.239.34.106NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns-cloud-a2.googledomains.com 2001:4860:4802:34::6aNOERROR, 12 ms, authoritativenoyes / yesrefused-
ns-cloud-a3.googledomains.com 216.239.36.106NOERROR, 41 ms, authoritativenoyes / yesrefused-
ns-cloud-a3.googledomains.com 2001:4860:4802:36::6aNOERROR, 42 ms, authoritativenoyes / yesrefused-
ns-cloud-a4.googledomains.com 216.239.38.106NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns-cloud-a4.googledomains.com 2001:4860:4802:38::6aNOERROR, 12 ms, authoritativenoyes / yesrefused-

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.
  • ✓ 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 3 · primary ns-cloud-a1.googledomains.com

Found

Primary (MNAME)
ns-cloud-a1.googledomains.com
Contact (RNAME)
postmaster.kobobooks.com
Serial
3
Refresh / retry
21600 s / 3600 s
Expire
259200 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns-cloud-a1.googledomains.com (216.239.32.106)3
ns-cloud-a1.googledomains.com (2001:4860:4802:32::6a)3
ns-cloud-a2.googledomains.com (216.239.34.106)3
ns-cloud-a2.googledomains.com (2001:4860:4802:34::6a)3
ns-cloud-a3.googledomains.com (216.239.36.106)3
ns-cloud-a3.googledomains.com (2001:4860:4802:36::6a)3
ns-cloud-a4.googledomains.com (216.239.38.106)3
ns-cloud-a4.googledomains.com (2001:4860:4802:38::6a)3

Checks

  • ✓ Serial 3 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 3d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 6h, retry 1h, expire 3d, negative TTL 5m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-cloud-a1.googledomains.com is one of the listed nameservers.
  • ✓ Contact postmaster@kobobooks.com #25
    The SOA RNAME postmaster.kobobooks.com means postmaster@kobobooks.com.
  • ✓ Counter serial #26
    The serial 3 is a plain counter.

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

14 records at the apex

Found

Read from
216.239.32.106:53
TypeValueTTL
SOAns-cloud-a1.googledomains.com. postmaster.kobobooks.com. 3 21600 3600 259200 30021600
NSns-cloud-a3.googledomains.com.21600
NSns-cloud-a4.googledomains.com.21600
NSns-cloud-a1.googledomains.com.21600
NSns-cloud-a2.googledomains.com.21600
A104.18.37.210300
A172.64.150.46300
MX5 kobobooks-com.mail.protection.outlook.com.7200
TXT"facebook-domain-verification=1680b948w5hc5cmh17estj39hss1vn"300
TXT"google-site-verification=ch6XVSaFhMCbQCeHAcxMmg5-PthkEqTYswmRP3ExUcE"300
TXT"google-site-verification=u9liKGD6HHZffOorPA-X--Ig9RYPf1n8NjXn5BVIWOk"300
TXT"v=spf1 ip4:204.87.189.254 ip4:204.87.189.202 ip4:204.87.189.5 ip4:84.39.136.5 ip4:84.39.136.254 include:spf.protection.outlook.com ~all"300
TXT"MS=ms74001948"300
TXT"ca3-aa9197a52dd645ef8db5fb461a4f9abf"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 2h, NS 6h. The NS TTL at the parent is 2d and in the zone 6h; 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