Domain report: knowbe4.com

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2027-08-23

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: Amazon Registrar, Inc.
Registered: 23 August 2010
Last changed: 19 July 2026
Expires: 23 August 2027
Status: client transfer prohibited
Registry nameservers: ns-1036.awsdns-01.org, ns-1882.awsdns-43.co.uk, ns-38.awsdns-04.com, ns-853.awsdns-42.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 2027-08-23 #3

The registration is valid until 2027-08-23 (305 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-1036.awsdns-01.org, ns-1882.awsdns-43.co.uk, ns-38.awsdns-04.com, ns-853.awsdns-42.net

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: ns-1036.awsdns-01.org, ns-1882.awsdns-43.co.uk, ns-38.awsdns-04.com, ns-853.awsdns-42.net
NS in the zone: ns-1036.awsdns-01.org, ns-1882.awsdns-43.co.uk, ns-38.awsdns-04.com, ns-853.awsdns-42.net

Nameserver	Addresses	Network (AS)	Glue
ns-1036.awsdns-01.org	205.251.196.12 2600:9000:5304:c00::1	AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US	-
ns-1882.awsdns-43.co.uk	205.251.199.90 2600:9000:5307:5a00::1	AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US	-
ns-38.awsdns-04.com	205.251.192.38 2600:9000:5300:2600::1	AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US	205.251.192.38 2600:9000:5300:2600::1
ns-853.awsdns-42.net	205.251.195.85 2600:9000:5303:5500::1	AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US	-

Checks

✓ 4 nameservers #6

Delegated to ns-1036.awsdns-01.org, ns-1882.awsdns-43.co.uk, ns-38.awsdns-04.com, ns-853.awsdns-42.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

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns-1036.awsdns-01.org 205.251.196.12	NOERROR, 3 ms, authoritative	no	yes / yes	refused	-
ns-1036.awsdns-01.org 2600:9000:5304:c00::1	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-
ns-1882.awsdns-43.co.uk 205.251.199.90	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns-1882.awsdns-43.co.uk 2600:9000:5307:5a00::1	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns-38.awsdns-04.com 205.251.192.38	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns-38.awsdns-04.com 2600:9000:5300:2600::1	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns-853.awsdns-42.net 205.251.195.85	NOERROR, 3 ms, authoritative	no	yes / yes	refused	-
ns-853.awsdns-42.net 2600:9000:5303:5500::1	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-

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-1036.awsdns-01.org

Found

Primary (MNAME): ns-1036.awsdns-01.org
Contact (RNAME): awsdns-hostmaster.amazon.com
Serial: 1
Refresh / retry: 7200 s / 900 s
Expire: 1209600 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns-1036.awsdns-01.org (205.251.196.12)	1
ns-1036.awsdns-01.org (2600:9000:5304:c00::1)	1
ns-1882.awsdns-43.co.uk (205.251.199.90)	1
ns-1882.awsdns-43.co.uk (2600:9000:5307:5a00::1)	1
ns-38.awsdns-04.com (205.251.192.38)	1
ns-38.awsdns-04.com (2600:9000:5300:2600::1)	1
ns-853.awsdns-42.net (205.251.195.85)	1
ns-853.awsdns-42.net (2600:9000:5303:5500::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-1036.awsdns-01.org 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

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 22 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
29402	ECDSAP256SHA256 (13)	SHA256 95D2244BA947558E…	NO
29403	ECDSAP256SHA256 (13)	SHA256 CB90BD73DC1B7A60…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
38899	ZSK (256)	ECDSAP256SHA256 (13)
38204	ZSK (256)	ECDSAP256SHA256 (13)
29403	KSK (257)	ECDSAP256SHA256 (13)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 29402 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ 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 08:32 UTC and expires at 2026-10-22 10:47 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

warn

45 records at the apex

Found

Read from: 205.251.196.12:53

Type	Value	TTL
SOA	ns-1036.awsdns-01.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400	900
NS	ns-1036.awsdns-01.org.	60
NS	ns-1882.awsdns-43.co.uk.	60
NS	ns-38.awsdns-04.com.	60
NS	ns-853.awsdns-42.net.	60
A	3.167.227.100	60
A	3.167.227.17	60
A	3.167.227.3	60
A	3.167.227.52	60
MX	1 aspmx.l.google.com.	60
MX	10 aspmx2.googlemail.com.	60
MX	10 aspmx3.googlemail.com.	60
MX	10 aspmx4.googlemail.com.	60
MX	10 aspmx5.googlemail.com.	60
MX	5 alt1.aspmx.l.google.com.	60
MX	5 alt2.aspmx.l.google.com.	60
TXT	"19e0be4ea5354278ae7eacfc48bedb9b"	60
TXT	"7bbdc96bfd404e609c241bb7a3210cc3"	60
TXT	"MS=ms32168056"	60
TXT	"adobe-idp-site-verification=370d08217eb4fd02ec25c8b9d1e4062ff87e4273d282e12f4995ea4e269c6160"	60
TXT	"adobe-sign-verification=600d5d8d4ae04f20e7d625c21e96ec48"	60
TXT	"amazonses:i7kVVveQqrOBBAmbA4eYXUtjyQz27rfUdUdlUdEjHjU="	60
TXT	"anthropic-domain-verification-gcynk1=3VVkzpvdUPpZYTTCvZEyX4Ioc"	60
TXT	"apple-domain-verification=qmAh14g4OX1bkue8"	60
TXT	"atlassian-domain-verification=OcPNSCfFoB9IocbkPrVxgaTPH2lCVlhD1MeWq//30V3aX05otEbViZRN5iaLjPWK"	60
TXT	"atlassian-domain-verification=ZhRqnN6RnH8AgFl3lYmodGh0L2aAKbEGfJETpJzak6O+lhMbMJ7WMiS392cSws63"	60
TXT	"bhd25m1n5fj8h8c4bchk43oeb4"	60
TXT	"docker-verification=e9e873bd-4dc8-437e-9718-93ee84b39448"	60
TXT	"g4l3bgqre4hkae8dfmm4v1q4je"	60
TXT	"google-site-verification=0aAUofkA6qAxk_uYttw0L4RjiIWAGL8-x-_pybvGhVo"	60
TXT	"google-site-verification=3Hie3OelJT_rJykvur3IxPN50L9mAmpstgWQu7g7rbQ"	60
TXT	"google-site-verification=EJTeC07BGnS6X2PWc5FoEbPRt8T91Y4-lhZW7RLxS-c"	60
TXT	"google-site-verification=WrBl38sScepa-oAzO5AlDr6qeJqHniarCDURkDMLpQs"	60
TXT	"google-site-verification=gzYt5XSP0eQeEkG99s_UNqSrR89qfnCg6f3uFz0v8wY"	60
TXT	"jamf-site-verification=RIg8eN5i9Iok12Yr5DejHw"	60
TXT	"mixpanel-domain-verify=bc139ab5-6f4e-41a7-b7cd-d13f89aa8710"	60
TXT	"mongodb-site-verification=CLB4dkKYnXU5G5xERSrl2N0XPr9EUX3a"	60
TXT	"openai-domain-verification=dv-dBBvIXDgY5ZxPl4tCjIHaNRq"	60
TXT	"pendo-domain-verification=02b2333b-3f4f-40ef-9659-408cec8ee1a3"	60
TXT	"status-page-domain-verification=mncmp25mgt7j"	60
TXT	"v=spf1 include:mailsenders.netsuite.com include:_spf.google.com include:mail.zendesk.com include:stspg-customer.com" " ip4:23.21.109.212 ip4:23.21.109.197 ip4:52.49.201.246 ip4:52.49.235.189 ip4:54.172.84.90 ip4:147.160.167.0/24 ip4:168.235.226.71" " ip4:168.235.226.72 ip4:168.235.226.73 ip4:168.235.226.74 ip4:168.235.233.211 ip4:168.235.233.212 ip4:168.235.233.213 ip4:192.254.121.248 ip4:167.89.63.53" " ip4:167.89.111.118 exists:%{i}._spf.mta.salesforce.com -all"	60
TXT	"wiz-domain-verification=80d80bf3b6c164a1fd91b8150e90ba3d504058315fd7c7245a9d0f480e5f1618"	60
TXT	"wiz-domain-verification=e6478bb3edd119aa3e701c038708e3cb1f0f13e7691fc7b2b488592070ae6366"	60
TXT	"zapier-domain-verification-challenge=67e81d94-81d3-44c1-bb5b-f278a3ed32ca"	60
TXT	"zapier-domain-verification-challenge=f1426c5b-21d2-4bc7-82dd-e74d108c77c8"	60

Checks

!

Very low TTLs

These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m), NS (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1m; resolvers may use either.

#32
✓ 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