tenable.com

Checked 22 October 2026, 11:01 UTC · via 8.8.8.8
!Passed with warnings
30 passed 1 warning 0 failed 4 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2028-04-11

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
10 April 1997
Last changed
16 May 2026
Expires
11 April 2028
Status
client transfer prohibited
Registry nameservers
ns1.tenablesecurity.com, ns2.tenablesecurity.com, ns3.tenablesecurity.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 2028-04-11 #3
    The registration is valid until 2028-04-11 (536 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

warn

ns1.tenablesecurity.com, ns2.tenablesecurity.com, ns3.tenablesecurity.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.tenablesecurity.com, ns2.tenablesecurity.com, ns3.tenablesecurity.com
NS in the zone
ns1.tenablesecurity.com, ns2.tenablesecurity.com, ns3.tenablesecurity.com
NameserverAddressesNetwork (AS)Glue
ns1.tenablesecurity.com206.205.255.73AS395671 TENABLE-NETWORK-SECURITY-INC - Tenable, Inc., US206.205.255.73
ns2.tenablesecurity.com3.212.162.242AS14618 AMAZON-AES - Amazon.com, Inc., US3.212.162.242
ns3.tenablesecurity.com52.38.181.124AS16509 AMAZON-02 - Amazon.com, Inc., US52.38.181.124

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.tenablesecurity.com, ns2.tenablesecurity.com, ns3.tenablesecurity.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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 3 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS14618 (AMAZON-AES - Amazon.com, Inc., US): 1 address; AS16509 (AMAZON-02 - Amazon.com, Inc., US): 1 address; AS395671 (TENABLE-NETWORK-SECURITY-INC - Tenable, Inc., US): 1 address.
  • 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.tenablesecurity.com 206.205.255.73NOERROR, 106 ms, authoritativenoyes / yesrefusedDNS
ns2.tenablesecurity.com 3.212.162.242NOERROR, 104 ms, authoritativenoyes / yesrefusedDNS
ns3.tenablesecurity.com 52.38.181.124NOERROR, 167 ms, authoritativenoyes / yesrefusedDNS

Checks

  • ✓ All respond #14
    All 3 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.tenablesecurity.com: "DNS"; ns2.tenablesecurity.com: "DNS"; ns3.tenablesecurity.com: "DNS".
    #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 2026101909 · primary ns1.tenablesecurity.com

Found

Primary (MNAME)
ns1.tenablesecurity.com
Contact (RNAME)
hostmaster.tenable.com
Serial
2026101909
Refresh / retry
10800 s / 3600 s
Expire
2592000 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns1.tenablesecurity.com (206.205.255.73)2026101909
ns2.tenablesecurity.com (3.212.162.242)2026101909
ns3.tenablesecurity.com (52.38.181.124)2026101909

Checks

  • ✓ Serial 2026101909 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 30d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.tenablesecurity.com is one of the listed nameservers.
  • ✓ Contact hostmaster@tenable.com #25
    The SOA RNAME hostmaster.tenable.com means hostmaster@tenable.com.
  • ✓ Date-based serial #26
    The serial 2026101909 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
2 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
47413ECDSAP256SHA256 (13)SHA256 F40DA3839577BB6F…yes

DNSKEY in the zone

Key tagRoleAlgorithm
47413KSK (257)ECDSAP256SHA256 (13)
65002ZSK (256)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 47413 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-02 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-02 04:21 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

pass

45 records at the apex

Found

Read from
206.205.255.73:53
TypeValueTTL
SOAns1.tenablesecurity.com. hostmaster.tenable.com. 2026101909 10800 3600 2592000 900300
NSns3.tenablesecurity.com.300
NSns1.tenablesecurity.com.300
NSns2.tenablesecurity.com.300
A54.159.189.155300
MX10 us-smtp-inbound-2.mimecast.com.600
MX10 us-smtp-inbound-1.mimecast.com.600
TXT"happeo-site-verification=fc403e999a8b4f80a5c0c7ea59d9aac1"300
TXT"adobe-idp-site-verification=dd57aac6628a70f8726e76946e94476a706a89bb5b527d7748641745d7680b08"300
TXT"google-site-verification=7YJqFLUdqsi0wFltczJEGHRvk28370P3QUYeRb2lH80"300
TXT"MS=ms70799374"300
TXT"MS=ms17590469"300
TXT"2295029"300
TXT"v=spf1 redirect=1mz2szrz._spf._d.mim.ec"300
TXT"h1-domain-verification=gkC8dff3yPgSuCZRjPs4XJZGowM4HNsc2vGJLqGwuSWkzUKF"300
TXT"apple-domain-verification=clcd7AntcH2Z4VX1"300
TXT"docusign=01896691-46f6-42a7-89da-42203b74c164"300
TXT"google-site-verification=r0TQaECa04je1WAQC5Vr8J6haS_diT7XfJAP7b11JGc"300
TXT"jamf-site-verification=_O2pEWqOpALI7eS_dSV66A"300
TXT"openai-domain-verification=dv-oR5hBU6DzZVCfrm2Rb8CcKaI"300
TXT"vmware-cloud-verification-106effbe-74cc-4aaa-a87b-418fa8a1311a"300
TXT"loaderio=304cb40b43c10147ec18df636e5b1f14"300
TXT"atlassian-domain-verification=tfLnjYErcFyBHEAn5HHFsyHmRHOk8jKA8MsvuU5tmk4ksTNEFXoTF89d4jxWhYYN"300
TXT"cloudflare_dashboard_sso=77bf41b0fe0cb1a4fe33ef0fb629cc71"300
TXT"mongodb-site-verification=UuqqFhlLa2RRB9OenLCtShRnVG1oU1a9"300
TXT"anthropic-domain-verification-ftf1s1=34hnt4QOYoo0eyF95YmmYg9kY"300
TXT"docusign=039a7a49-7176-4b7b-bb58-d198685b7f4a"300
TXT"docker-verification=70eeb94b-709c-4f1e-b42b-22d8e1fbdeff"300
TXT"smartsheet-site-validation=aE-2DN7VhGhwmzQX6rYdQKbSYLQrs2OB"300
TXT"mongodb-site-verification=6cytGCbf6nHMLIrkAt0NzzCGUruLwGpq"300
TXT"stripe-verification=C74D8DB8219324F9C5BCAE5F1B45965C9399760AAB9FC3B85D2B359674823CCE"300
TXT"atlassian-sending-domain-verification=b64f93bc-c961-439a-b5ea-0c7fa98e4362"300
TXT"google-site-verification=hhYrinLheLXQftB07nvY5QsNwUwoquWT5BIGYCBV2m4"300
TXT"google-site-verification=cAaJwNBUyRkwsXhHM9ccBNCUrbEiyCAycUpS-pLNDb0"300
TXT"google-site-verification=NQ51A02Hvzw45aMVkt8I_WWalY74CryagW8FxtkgMU4"300
TXT"hpe-greenlake-domain-verification=493731504b496a506a31484b586676587a394b787970596b79794e4947304b37"300
TXT"postman-domain-verification=50380d45de6d54a2d098961909fc132a12c58d50e260586e8ba33438a6a8b286513a3d77ed0adae11d59bca4f2e9f60eb2f31f7f9756b3f51841f7354ebe8d30"300
CAA0 issue "amazon.com"300
CAA0 issue "digicert.com"300
CAA0 issue "ssl.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "digicert.com"300
CAA0 issuewild "amazon.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 10m, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: amazon.com, digicert.com, ssl.com, letsencrypt.org, pki.goog.