ktvb.com

Checked 22 October 2026, 09:33 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 3 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2027-05-03

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
2 May 1995
Last changed
16 May 2026
Expires
3 May 2027
Status
client transfer prohibited
Registry nameservers
ns-136.awsdns-17.com, ns-1401.awsdns-47.org, ns-1551.awsdns-01.co.uk, ns-913.awsdns-50.net
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 2027-05-03 #3
    The registration is valid until 2027-05-03 (192 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-136.awsdns-17.com, ns-1401.awsdns-47.org, ns-1551.awsdns-01.co.uk, ns-913.awsdns-50.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-136.awsdns-17.com, ns-1401.awsdns-47.org, ns-1551.awsdns-01.co.uk, ns-913.awsdns-50.net
NS in the zone
ns-136.awsdns-17.com, ns-1401.awsdns-47.org, ns-1551.awsdns-01.co.uk, ns-913.awsdns-50.net
NameserverAddressesNetwork (AS)Glue
ns-136.awsdns-17.com205.251.192.136 2600:9000:5300:8800::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.136 2600:9000:5300:8800::1
ns-1401.awsdns-47.org205.251.197.121 2600:9000:5305:7900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1551.awsdns-01.co.uk205.251.198.15 2600:9000:5306:f00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-913.awsdns-50.net205.251.195.145 2600:9000:5303:9100::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-136.awsdns-17.com, ns-1401.awsdns-47.org, ns-1551.awsdns-01.co.uk, ns-913.awsdns-50.net.
  • ✓ 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 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., 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
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-136.awsdns-17.com 205.251.192.136NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-136.awsdns-17.com 2600:9000:5300:8800::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1401.awsdns-47.org 205.251.197.121NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1401.awsdns-47.org 2600:9000:5305:7900::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1551.awsdns-01.co.uk 205.251.198.15NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1551.awsdns-01.co.uk 2600:9000:5306:f00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-913.awsdns-50.net 205.251.195.145NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-913.awsdns-50.net 2600:9000:5303:9100::1NOERROR, 5 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

pass

serial 1 · primary ns-136.awsdns-17.com

Found

Primary (MNAME)
ns-136.awsdns-17.com
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns-136.awsdns-17.com (205.251.192.136)1
ns-136.awsdns-17.com (2600:9000:5300:8800::1)1
ns-1401.awsdns-47.org (205.251.197.121)1
ns-1401.awsdns-47.org (2600:9000:5305:7900::1)1
ns-1551.awsdns-01.co.uk (205.251.198.15)1
ns-1551.awsdns-01.co.uk (2600:9000:5306:f00::1)1
ns-913.awsdns-50.net (205.251.195.145)1
ns-913.awsdns-50.net (2600:9000:5303:9100::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-136.awsdns-17.com is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 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

22 records at the apex

Found

Read from
205.251.192.136:53
TypeValueTTL
SOAns-136.awsdns-17.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 300300
NSns-136.awsdns-17.com.172800
NSns-1401.awsdns-47.org.172800
NSns-1551.awsdns-01.co.uk.172800
NSns-913.awsdns-50.net.172800
A13.248.160.137600
A76.223.34.124600
MX100 ktvb-com.mail.protection.outlook.com.600
TXT"00Dj0000001qcPm=1TBRk00000002wH"300
TXT"06vzztxhflyp8z91jr6wgzm8x0wtz3tb"300
TXT"6n5d4dj72j1mcw3d0d7q59dp7mjpzvnl"300
TXT"6wgd67q126l20mgjbrmfpthpqqhrjl1x"300
TXT"MS=ms76668909"300
TXT"facebook-domain-verification=abj2kxiiplkq8q5ccc3i83a9goagmv"300
TXT"google-site-verification=YZo_XSC8mF_hVYv88I4ejfUv6psOaBlqOXs7TNiGQBI"300
TXT"google-site-verification=fX3FHlb7SiVOZ04TfcXf_SUXSTbmizjv3fKbPOE10-o"300
TXT"n4m7l5cs9fqy99dd7c2qlkslqt17yc25"300
TXT"sx9h95lr1pr7t15378x6f3kj8l53gx9p"300
TXT"tb3v22xpzmypld1pbksqs715773v69d7"300
TXT"v=spf1 include:spf.protection.outlook.com include:_spf.createsend.com include:51504418.spf04.hubspotemail.net -all"300
TXT"vdkkd97mljrhpkbt8cgrwp1rc3gzg686"300
TXT"y41hjvdtntxjtz8dlkqps8cvr6sq23yp"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 2d.
  • ✓ 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