informationweek.com

Checked 22 October 2026, 09:20 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 7 info

Registration

info

.com generic · SafeNames Ltd. · expires 2027-05-03

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
SafeNames Ltd.
Registered
2 May 1995
Last changed
4 May 2026
Expires
3 May 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.ubmdns.com, ns2.ubmdns.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 2027-05-03 #3
    The registration is valid until 2027-05-03 (192 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns1.ubmdns.com, ns2.ubmdns.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.ubmdns.com, ns2.ubmdns.com
NS in the zone
ns1.ubmdns.com, ns2.ubmdns.com
NameserverAddressesNetwork (AS)Glue
ns1.ubmdns.com162.159.0.208 2400:cb00:2049:1::a29f:d0AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US162.159.0.208
ns2.ubmdns.com162.159.1.208 2400:cb00:2049:1::a29f:1d0AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US162.159.1.208

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.ubmdns.com, ns2.ubmdns.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns1.ubmdns.com (glue 162.159.0.208, zone 162.159.0.208, 2400:cb00:2049:1::a29f:d0); ns2.ubmdns.com (glue 162.159.1.208, zone 162.159.1.208, 2400:cb00:2049:1::a29f:1d0). Update the glue at your registrar.
    #8
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2400:cb00:2049::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 4 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 .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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.ubmdns.com 162.159.0.208NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
ns1.ubmdns.com 2400:cb00:2049:1::a29f:d0NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
ns2.ubmdns.com 162.159.1.208NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
ns2.ubmdns.com 2400:cb00:2049:1::a29f:1d0NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 4 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: ns1.ubmdns.com: "2026.10.2"; ns2.ubmdns.com: "2026.10.2". 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 2418146412 · primary ns1.ubmdns.com

Found

Primary (MNAME)
ns1.ubmdns.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418146412
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
ns1.ubmdns.com (162.159.0.208)2418146412
ns1.ubmdns.com (2400:cb00:2049:1::a29f:d0)2418146412
ns2.ubmdns.com (162.159.1.208)2418146412
ns2.ubmdns.com (2400:cb00:2049:1::a29f:1d0)2418146412

Checks

  • ✓ Serial 2418146412 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.ubmdns.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2418146412 is a Unix timestamp (2046-08-17 19:20 UTC).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 B6B41443013394B6…yes

DNSKEY in the zone

Key tagRoleAlgorithm
2371KSK (257)ECDSAP256SHA256 (13)
34505ZSK (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 2371 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-21 08:20 UTC and expires at 2026-10-23 10:20 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

23 records at the apex

Found

Read from
162.159.0.208:53
TypeValueTTL
SOAns1.ubmdns.com. dns.cloudflare.com. 2418146412 10000 2400 604800 18001800
NSns1.ubmdns.com.86400
NSns2.ubmdns.com.86400
A104.16.79.223300
A104.16.82.223300
A104.16.81.223300
A104.16.83.223300
A104.16.80.223300
AAAA2606:4700::6810:53df300
AAAA2606:4700::6810:52df300
AAAA2606:4700::6810:50df300
AAAA2606:4700::6810:4fdf300
AAAA2606:4700::6810:51df300
MX10 us-smtp-inbound-1.mimecast.com.300
MX10 us-smtp-inbound-2.mimecast.com.300
TXT"MS=ms33065874"300
TXT"MS=ms53283219"300
TXT"P2A_7556_5"300
TXT"google-site-verification=6joMinuhNdUlhnp7bFtVuLeCdTS90o5VgrGuZGqwh8w"300
TXT"google-site-verification=XzNlX73BAy0f9LYfYAkYeTiQKeKvnLkUlzT1cpRzJyY"300
TXT"google-site-verification=doCdAIQ4FJ3yo-047WoLHDdjRLjR_A9qHK-PIIlYLmU"300
TXT"google-site-verification=tfoH_QRqqut1Dye28qvL7BHQkB0IlGBfnzKjBCmhMjQ"300
TXT"v=spf1 mx include:spf-1.ubm.com include:spf-mcst.ubm.com ~all"300

Checks

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