ntt.com

Checked 22 October 2026, 10:04 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · Japan Registry Services Co., Ltd. · expires 2031-10-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Japan Registry Services Co., Ltd.
Registered
7 October 1997
Last changed
31 August 2026
Expires
6 October 2031
Status
client transfer prohibited
Registry nameservers
a1-79.akam.net, a22-66.akam.net, a24-66.akam.net, a5-65.akam.net, a7-66.akam.net, a8-67.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 2031-10-06 #3
    The registration is valid until 2031-10-06 (1809 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

a1-79.akam.net, a22-66.akam.net, a24-66.akam.net, a5-65.akam.net, a7-66.akam.net, a8-67.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-79.akam.net, a22-66.akam.net, a24-66.akam.net, a5-65.akam.net, a7-66.akam.net, a8-67.akam.net
NS in the zone
a1-79.akam.net, a22-66.akam.net, a24-66.akam.net, a5-65.akam.net, a7-66.akam.net, a8-67.akam.net
NameserverAddressesNetwork (AS)Glue
a1-79.akam.net193.108.91.79 2600:1401:2::4fAS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-66.akam.net23.211.61.66 2600:1480:7800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a24-66.akam.net2.16.130.66 2600:1480:9800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-65.akam.net95.100.168.65 2600:1480:b000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-66.akam.net23.61.199.66 2600:1406:32::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a8-67.akam.net2.16.40.67 2600:1403:a::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-79.akam.net, a22-66.akam.net, a24-66.akam.net, a5-65.akam.net, a7-66.akam.net, a8-67.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 12 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 .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
a1-79.akam.net 193.108.91.79NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
a1-79.akam.net 2600:1401:2::4fNOERROR, 4 ms, authoritativenoyes / yesrefused41824.11
a22-66.akam.net 23.211.61.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a22-66.akam.net 2600:1480:7800::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a24-66.akam.net 2.16.130.66NOERROR, 5 ms, authoritativenoyes / yesrefused48878.33
a24-66.akam.net 2600:1480:9800::42NOERROR, 5 ms, authoritativenoyes / yesrefused48878.32
a5-65.akam.net 95.100.168.65NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a5-65.akam.net 2600:1480:b000::41NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
a7-66.akam.net 23.61.199.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.7
a7-66.akam.net 2600:1406:32::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a8-67.akam.net 2.16.40.67NOERROR, 5 ms, authoritativenoyes / yesrefused48878.33
a8-67.akam.net 2600:1403:a::43NOERROR, 5 ms, authoritativenoyes / yesrefused48878.33

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: a1-79.akam.net: "41824.5"; a1-79.akam.net: "41824.11"; a22-66.akam.net: "48878.30"; a22-66.akam.net: "48878.26"; a24-66.akam.net: "48878.33"; a24-66.akam.net: "48878.32"; a5-65.akam.net: "41824.10"; a5-65.akam.net: "41824.8"; a7-66.akam.net: "41824.7"; a7-66.akam.net: "41824.9"; a8-67.akam.net: "48878.33". 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 902 · primary a1-79.akam.net

Found

Primary (MNAME)
a1-79.akam.net
Contact (RNAME)
root.ntt.net
Serial
902
Refresh / retry
3600 s / 900 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
a1-79.akam.net (193.108.91.79)902
a1-79.akam.net (2600:1401:2::4f)902
a22-66.akam.net (23.211.61.66)902
a22-66.akam.net (2600:1480:7800::42)902
a24-66.akam.net (2.16.130.66)902
a24-66.akam.net (2600:1480:9800::42)902
a5-65.akam.net (95.100.168.65)902
a5-65.akam.net (2600:1480:b000::41)902
a7-66.akam.net (23.61.199.66)902
a7-66.akam.net (2600:1406:32::42)902
a8-67.akam.net (2.16.40.67)902
a8-67.akam.net (2600:1403:a::43)902

Checks

  • ✓ Serial 902 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-79.akam.net is one of the listed nameservers.
  • ✓ Contact root@ntt.net #25
    The SOA RNAME root.ntt.net means root@ntt.net.
  • ✓ Counter serial #26
    The serial 902 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

29 records at the apex

Found

Read from
193.108.91.79:53
TypeValueTTL
SOAa1-79.akam.net. root.ntt.net. 902 3600 900 604800 8640086400
NSa1-79.akam.net.300
NSa22-66.akam.net.300
NSa8-67.akam.net.300
NSa5-65.akam.net.300
NSa24-66.akam.net.300
NSa7-66.akam.net.300
A75.2.68.185300
A166.117.204.41300
MX10 ntt-com.mail.protection.outlook.com.86400
TXT"00D28000001KVeY=1TBfQ00000002cv"600
TXT"a3c8e05a-1a9e-4c2a-8180-c1e5fb94f16c"600
TXT"00DIm000000Gyi0=1TBfd00000000Kz;00DIk000000LG3w=1TBIk000000Gma9;00DfU000000nizB=1TBfU00000000Uf;00DIo000000H0PV=1TBBW00000000b7;00DIk000000H1E8=1TBfV00000000jB"600
TXT"apple-domain-verification=2vv4ezSagfHaPe43"600
TXT"Foxit-domain-verification=a965001b9cc73ffce1df385333c5cd56"600
TXT"debbcl7knt7pdj9opqcsvk2h4p"600
TXT"ms-domain-verification=8271f02e-3251-4ae0-8e14-d4fa57ad88ac"600
TXT"nulab-verification-code=FG0gTaKAiBRUN8aZ85VeD1Owtd23fF8jXCTm8EAeYEK4WldagxgEVXQUxPJYB3wz"600
TXT"pardot202732=4e685cfe53fb48a580fba11046ab07d238db850cc586b7163709fb433f3f7856"600
TXT"infoblox-domain-mastery=0b9ba0959bf8618384c45187218d1ed2b84a2b16140471e4cda4a4716ebe0b0ba8"600
TXT"atlassian-domain-verification=LjrCD0h01TlMydwl5rfvme62hxyE/bC8SI8LCcYupQdRM8tMa0MW1ZUiOAcLokT/"600
TXT"v=spf1 include:spf.protection.outlook.com include:spf01.ntt.com include:spf02.ntt.com include:spf03.ntt.com include:spf04.ntt.com ~all"600
TXT"mongodb-site-verification=EMWSCtdqeCMeQMAM9s56ytvczjiEvn97"600
TXT"pardot902161=fed4cbc15303d4ce9a0c22fb2279ddafd911102610f1097cb405249a747d1935"600
TXT"docusign=44757ed1-7576-43ba-94d7-62d897318750"600
TXT"anthropic-domain-verification-c4tmzq=Oo7fcg1f9vSoyhlqpfUOiJ1c4"600
TXT"nulab-verification-code=wXarwppy8hcNqwR9TYsUulSXnA6J1Hjs2SZMgQ8v9OqWvuEMluo5XW5QRg9MXXyr"600
TXT"google-site-verification=KE_utD2u87YoJAM7FDubFzlcS4ogGhBtJH92Arq9G-4"600
TXT"bill-one-domain-verification=4cbe61e5-4bcc-41cf-9af0-e5ad5a42549b"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1d, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; 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