tvb.com

Checked 22 October 2026, 11:13 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-02-17

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
17 February 1999
Last changed
13 February 2026
Expires
17 February 2027
Status
client transfer prohibited
Registry nameservers
a1-49.akam.net, a11-64.akam.net, a12-65.akam.net, a18-66.akam.net, a28-67.akam.net, a3-64.akam.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 2027-02-17 #3
    The registration is valid until 2027-02-17 (117 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

a1-49.akam.net, a11-64.akam.net, a12-65.akam.net, a18-66.akam.net, a28-67.akam.net, a3-64.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-49.akam.net, a11-64.akam.net, a12-65.akam.net, a18-66.akam.net, a28-67.akam.net, a3-64.akam.net
NS in the zone
a1-49.akam.net, a11-64.akam.net, a12-65.akam.net, a18-66.akam.net, a28-67.akam.net, a3-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-49.akam.net193.108.91.49 2600:1401:2::31AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a11-64.akam.net84.53.139.64 2600:1480:1::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a12-65.akam.net184.26.160.65 2600:1480:f000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-66.akam.net95.101.36.66 2600:1480:4800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a28-67.akam.net95.100.173.67 2600:1480:d800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-64.akam.net96.7.49.64 2600:1408:1c::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-49.akam.net, a11-64.akam.net, a12-65.akam.net, a18-66.akam.net, a28-67.akam.net, a3-64.akam.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 6 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses.
  • i
    All nameserver names under .net
    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

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-49.akam.net 193.108.91.49NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a1-49.akam.net 2600:1401:2::31NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a11-64.akam.net 84.53.139.64NOERROR, 5 ms, authoritativenoyes / yesrefused41824.10
a11-64.akam.net 2600:1480:1::40NOERROR, 5 ms, authoritativenoyes / yesrefused41824.4
a12-65.akam.net 184.26.160.65NOERROR, 5 ms, authoritativenoyes / yesrefused48878.32
a12-65.akam.net 2600:1480:f000::41NOERROR, 5 ms, authoritativenoyes / yesrefused48878.32
a18-66.akam.net 95.101.36.66NOERROR, 5 ms, authoritativenoyes / yesrefused48878.26
a18-66.akam.net 2600:1480:4800::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a28-67.akam.net 95.100.173.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.26
a28-67.akam.net 2600:1480:d800::43NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a3-64.akam.net 96.7.49.64NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a3-64.akam.net 2600:1408:1c::40NOERROR, 4 ms, authoritativenoyes / yesrefused41824.11

Checks

  • ✓ All respond #14
    All 12 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: a1-49.akam.net: "41824.9"; a1-49.akam.net: "41824.10"; a11-64.akam.net: "41824.10"; a11-64.akam.net: "41824.4"; a12-65.akam.net: "48878.32"; a18-66.akam.net: "48878.26"; a18-66.akam.net: "48878.30"; a28-67.akam.net: "48878.26"; a28-67.akam.net: "48878.30"; a3-64.akam.net: "41824.4"; a3-64.akam.net: "41824.11". 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

info

serial 4026102201 · primary dns3.hk1.tvb.com

Found

Primary (MNAME)
dns3.hk1.tvb.com
Contact (RNAME)
hostmaster.tvb.com
Serial
4026102201
Refresh / retry
1200 s / 300 s
Expire
604800 s
Negative TTL
14400 s

Serial per nameserver

NameserverSerial
a1-49.akam.net (193.108.91.49)4026102201
a1-49.akam.net (2600:1401:2::31)4026102201
a11-64.akam.net (84.53.139.64)4026102201
a11-64.akam.net (2600:1480:1::40)4026102201
a12-65.akam.net (184.26.160.65)4026102201
a12-65.akam.net (2600:1480:f000::41)4026102201
a18-66.akam.net (95.101.36.66)4026102201
a18-66.akam.net (2600:1480:4800::42)4026102201
a28-67.akam.net (95.100.173.67)4026102201
a28-67.akam.net (2600:1480:d800::43)4026102201
a3-64.akam.net (96.7.49.64)4026102201
a3-64.akam.net (2600:1408:1c::40)4026102201

Checks

  • ✓ Serial 4026102201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 20m, retry 5m, expire 7d, negative TTL 4h.
  • i
    Hidden master
    The primary nameserver dns3.hk1.tvb.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@tvb.com #25
    The SOA RNAME hostmaster.tvb.com means hostmaster@tvb.com.
  • ✓ Timestamp serial #26
    The serial 4026102201 is a Unix timestamp (2097-07-31 09:43 UTC).

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

26 records at the apex

Found

Read from
193.108.91.49:53
TypeValueTTL
SOAdns3.hk1.tvb.com. hostmaster.tvb.com. 4026102201 1200 300 604800 1440014400
NSa11-64.akam.net.172800
NSa28-67.akam.net.172800
NSa3-64.akam.net.172800
NSa18-66.akam.net.172800
NSa1-49.akam.net.172800
NSa12-65.akam.net.172800
A34.117.137.152900
MX0 tvb-com.mail.protection.outlook.com.3600
TXT"apple-domain-verification=HPPGXYrEUwRzaY35"900
TXT"google-site-verification=XcQYVwP2vUP6X4yBl4yYDnjwwyd1CemkOLU6slUxLlw"900
TXT"google-site-verification=hXv3ZQtbscs9RxNSAg98wdh4xoy7vXDJ1Zgz4UKACks"900
TXT"google-site-verification=reCtjOS261gZg8rynzxuB18-4_Qd64LudEejm7pBtls"900
TXT"mtjz4rx543gfmc2qxtx03rfmn5ds82kz"900
TXT"google-site-verification=vXe1LteO75felwBDGxwjneMhnajww4lwbsou1yeXpN4"900
TXT"_x2dnm7uqq2gizp94us9ghps5z87w1ic"900
TXT"kiro-site-verification=ea93cad5-9d1a-4e82-b9af-f1380e9607a1"900
TXT"v=spf1 include:spf.protection.outlook.com include:_spf.psm.knowbe4.com include:_spf.google.com -all"900
TXT"google-site-verification=SnMbrL0zxQvIJ0H98N9xphLeAuov6IRHIeD6WfkBeTU"900
TXT"atlassian-domain-verification=LEv4JrpSAzO1ssUld6DNSI6taXyM0owMAeFGE9zKoevBDqFUypOwVsrJvLjlarjN"900
TXT"google-site-verification=e-Fk27io2Qk7LqqfT0YC_xaj0QSTNv7yNvR1rPD1ffs"900
TXT"android-enroll=https://win-vcsa1.hk3.tvb.com/rtc/win-ldms1/MDM/api/v1/enroll/AndroidEnroll"900
TXT"_gssrhu0e6haaoxt146ccm6xqko94wwe"900
TXT"pchfn6ml524hr1jvv4g93qmz3d2zw27g"900
TXT"1password-site-verification=QBUZMOU5XBAUPJTNJY7URCUDOE"900
TXT"iOS-enroll=https://win-vcsa1.hk3.tvb.com/rtc/win-ldms1/MDM/api/v1/enroll/IosEnroll"900

Checks

  • ✓ TTLs within range #32
    TTLs: A 15m, MX 1h, 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