tbo.com

Checked 22 October 2026, 10:55 UTC · via 8.8.8.8
!Passed with warnings
28 passed 1 warning 0 failed 5 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2027-09-17

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
18 September 1998
Last changed
16 September 2026
Expires
17 September 2027
Status
active
Registry nameservers
ns-1477.awsdns-56.org, ns-1621.awsdns-10.co.uk, ns-236.awsdns-29.com, ns-971.awsdns-57.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 2027-09-17 #3
    The registration is valid until 2027-09-17 (329 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns-1477.awsdns-56.org, ns-1621.awsdns-10.co.uk, ns-236.awsdns-29.com, ns-971.awsdns-57.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1477.awsdns-56.org, ns-1621.awsdns-10.co.uk, ns-236.awsdns-29.com, ns-971.awsdns-57.net
NS in the zone
ns-1477.awsdns-56.org, ns-1621.awsdns-10.co.uk, ns-236.awsdns-29.com, ns-971.awsdns-57.net
NameserverAddressesNetwork (AS)Glue
ns-1477.awsdns-56.org205.251.197.197 2600:9000:5305:c500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1621.awsdns-10.co.uk205.251.198.85 2600:9000:5306:5500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-236.awsdns-29.com205.251.192.236 2600:9000:5300:ec00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.236 2600:9000:5300:ec00::1
ns-971.awsdns-57.net205.251.195.203 2600:9000:5303:cb00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1477.awsdns-56.org, ns-1621.awsdns-10.co.uk, ns-236.awsdns-29.com, ns-971.awsdns-57.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-1477.awsdns-56.org 205.251.197.197NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1477.awsdns-56.org 2600:9000:5305:c500::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1621.awsdns-10.co.uk 205.251.198.85NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1621.awsdns-10.co.uk 2600:9000:5306:5500::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-236.awsdns-29.com 205.251.192.236NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-236.awsdns-29.com 2600:9000:5300:ec00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-971.awsdns-57.net 205.251.195.203NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-971.awsdns-57.net 2600:9000:5303:cb00::1NOERROR, 4 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-236.awsdns-29.com

Found

Primary (MNAME)
ns-236.awsdns-29.com
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1477.awsdns-56.org (205.251.197.197)1
ns-1477.awsdns-56.org (2600:9000:5305:c500::1)1
ns-1621.awsdns-10.co.uk (205.251.198.85)1
ns-1621.awsdns-10.co.uk (2600:9000:5306:5500::1)1
ns-236.awsdns-29.com (205.251.192.236)1
ns-236.awsdns-29.com (2600:9000:5300:ec00::1)1
ns-971.awsdns-57.net (205.251.195.203)1
ns-971.awsdns-57.net (2600:9000:5303:cb00::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 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-236.awsdns-29.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

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC
Signatures valid until
22 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
60487ZSK (256)ECDSAP256SHA256 (13)
6921ZSK (256)ECDSAP256SHA256 (13)
5423KSK (257)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 2h0m0s and created on demand; the current one was made at 2026-10-22 09:55 UTC and expires at 2026-10-22 12:10 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

info

19 records at the apex

Found

Read from
205.251.197.197:53
TypeValueTTL
SOAns-236.awsdns-29.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1477.awsdns-56.org.172800
NSns-1621.awsdns-10.co.uk.172800
NSns-236.awsdns-29.com.172800
NSns-971.awsdns-57.net.172800
A13.126.206.1983600
MX0 tbo-com.mail.protection.outlook.com.3600
TXT"0ed1fe018a5d0fe0fcb109493bb5a85ef76379c51f"3600
TXT"552rx08gn5w4nlpdrq4zx15yq0wg3stl"3600
TXT"5n7bjkqxr9tyz93fm2y7jqx4yb1mwzgx"3600
TXT"_x6ilay7yno1l0c0yk8ol9f58yiutjkx_6bz206drwqyx4m14sf1xic8kw8iyjne\"_ggxbm6y8mwnxtvq10r7rp8w3r0aub4d\"\""3600
TXT"amazonses:6lWejVEuXIJCKnL0wdpQ99g0qX2Ibh6beEo5lDFo3CU="3600
TXT"apple-domain-verification=mSvlvd6LhQTOVyYt"3600
TXT"cursor-domain-verification-xm2syj=Cr1V28fPNGzQYX9PyxaPAjwgc"3600
TXT"google-site-verification=25KQyenoljTPdvbbyQVo3K4PAOn8BNSN9UjLFsxsHIY"3600
TXT"google-site-verification=a1XYlZvcRssKS_QFuypr5t0vWOESQ5i5yqqvdj6eARA"3600
TXT"google-site-verification=p3rJ6o_2NqoGUnoAxDWKtDSEEw8gJ2l8M-5ur6X2qeI"3600
TXT"r3qf67kyrmhq48bh2k0957mwyp2zsxvh"3600
TXT"v=spf1 include:spf.protection.outlook.com include:spf.travelinfomail.com include:mail.zendesk.com include:spf.zohomail360.com include:sendgrid.net include:amazonses.com include:spf.salesforce.com -all"3600

Checks

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