openlearning.com

Checked 22 October 2026, 10:10 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · Netregistry Wholesale Pty Ltd · expires 2027-06-14

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Netregistry Wholesale Pty Ltd
Registered
15 June 1995
Last changed
17 April 2023
Expires
14 June 2027
Status
active
Registry nameservers
ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info
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 2027-06-14 #3
    The registration is valid until 2027-06-14 (234 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

ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info
NS in the zone
ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info
NameserverAddressesNetwork (AS)Glue
ns1-01.azure-dns.com13.107.236.1 2603:1061:0:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US13.107.236.1 2603:1061:0:700::1
ns2-01.azure-dns.net150.171.21.1 2620:1ec:8ec:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns3-01.azure-dns.org204.14.183.1 2a01:111:4000:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns4-01.azure-dns.info208.84.5.1 2620:1ec:bda:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info.
  • ✓ 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 (AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, 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, .info, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1-01.azure-dns.com 13.107.236.1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1-01.azure-dns.com 2603:1061:0:700::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2-01.azure-dns.net 150.171.21.1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2-01.azure-dns.net 2620:1ec:8ec:700::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-01.azure-dns.org 204.14.183.1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-01.azure-dns.org 2a01:111:4000:700::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns4-01.azure-dns.info 208.84.5.1NOERROR, 4 ms, authoritativenoyes / yesrefusedKnot DNS 3.1.2.1770717641.d6b376aff
ns4-01.azure-dns.info 2620:1ec:bda:700::1NOERROR, 5 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns4-01.azure-dns.info: "Knot DNS 3.1.2.1770717641.d6b376aff". 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 1 · primary ns1-01.azure-dns.com

Found

Primary (MNAME)
ns1-01.azure-dns.com
Contact (RNAME)
azuredns-hostmaster.microsoft.com
Serial
1
Refresh / retry
3600 s / 300 s
Expire
2419200 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1-01.azure-dns.com (13.107.236.1)1
ns1-01.azure-dns.com (2603:1061:0:700::1)1
ns2-01.azure-dns.net (150.171.21.1)1
ns2-01.azure-dns.net (2620:1ec:8ec:700::1)1
ns3-01.azure-dns.org (204.14.183.1)1
ns3-01.azure-dns.org (2a01:111:4000:700::1)1
ns4-01.azure-dns.info (208.84.5.1)1
ns4-01.azure-dns.info (2620:1ec:bda:700::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 5m, expire 28d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1-01.azure-dns.com is one of the listed nameservers.
  • ✓ Contact azuredns-hostmaster@microsoft.com #25
    The SOA RNAME azuredns-hostmaster.microsoft.com means azuredns-hostmaster@microsoft.com.
  • ✓ Counter serial #26
    The serial 1 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

pass

29 records at the apex

Found

Read from
13.107.236.1:53
TypeValueTTL
SOAns1-01.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 3003600
NSns1-01.azure-dns.com.172800
NSns2-01.azure-dns.net.172800
NSns3-01.azure-dns.org.172800
NSns4-01.azure-dns.info.172800
A150.171.109.1003600
MX10 aspmx3.googlemail.com.3600
MX10 aspmx2.googlemail.com.3600
MX5 alt2.aspmx.l.google.com.3600
MX1 aspmx.l.google.com.3600
MX5 alt1.aspmx.l.google.com.3600
MX1 smtp.google.com.3600
TXT"0QsSzwsXRa/PczJZ3/c6s1s6FrvHtLZlDGXR8vXB1Ys="3600
TXT"google-site-verification=gsXdsNCgh1CW9rqdpmo9Vxyh5qPRI5QVhcfUd1hKGZk"3600
TXT"v=spf1 include:_spf.google.com include:amazonses.com include:696603.spf02.hubspotemail.net include:8796327.spf04.hubspotemail.net include:mailgun.org ~all"3600
TXT"google-site-verification=9iRm2zjYhBCOCTj8gF_y7CnzjG7V_Lyqh00Q8sOIUlg"3600
TXT"MS=7766243BB3C923D080BD4F9D34EFB596D910C3C0"3600
TXT"google-site-verification=UlzjGNo9gi1u9Rt6nbWa54RyCZs0b3j0UCBGHE7Nua0"3600
TXT"google-site-verification=UqkQuFIzxpqMQ7ZZq43_Ea2zSMNeOjGcTX432jsHKN8"3600
TXT"MS=ms13982965"3600
TXT"include:smtp1.uservoice.com"3600
TXT"google-site-verification=q9h5gwKIUBu_K5Z6BchYtt8AaEnsz8JYafsC3HjAGZM"3600
TXT"google-site-verification=FV1JieV0W1V2cIWfKDhPMc-h1fL14Mgo5yz_Ac-vJGc"3600
TXT"brevo-code:ec84bbca21932b6e29b51a755ec25793"3600
CAA0 issue "digicert.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "comodoca.com"3600
CAA0 issue "pki.goog"3600
CAA0 issue "ssl.com"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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, letsencrypt.org, comodoca.com, pki.goog, ssl.com.