udemy.com

Checked 22 October 2026, 11:14 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 6 info

Registration

info

.com generic · SafeNames Ltd. · expires 2027-08-13

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
SafeNames Ltd.
Registered
13 August 2009
Last changed
1 September 2025
Expires
13 August 2027
Status
client delete prohibited, client transfer prohibited
Registry nameservers
anna.ns.cloudflare.com, pete.ns.cloudflare.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 2027-08-13 #3
    The registration is valid until 2027-08-13 (295 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

anna.ns.cloudflare.com, pete.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
anna.ns.cloudflare.com, pete.ns.cloudflare.com
NS in the zone
anna.ns.cloudflare.com, pete.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
anna.ns.cloudflare.com172.64.32.102 173.245.58.102 108.162.192.102 2a06:98c1:50::ac40:2066 2606:4700:50::adf5:3a66 2803:f800:50::6ca2:c066AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.192.102 172.64.32.102 173.245.58.102 2606:4700:50::adf5:3a66 2803:f800:50::6ca2:c066 2a06:98c1:50::ac40:2066
pete.ns.cloudflare.com108.162.193.136 173.245.59.136 172.64.33.136 2606:4700:58::adf5:3b88 2a06:98c1:50::ac40:2188 2803:f800:50::6ca2:c188AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.193.136 172.64.33.136 173.245.59.136 2606:4700:58::adf5:3b88 2803:f800:50::6ca2:c188 2a06:98c1:50::ac40:2188

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: anna.ns.cloudflare.com, pete.ns.cloudflare.com.
    #6
  • ✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
anna.ns.cloudflare.com 172.64.32.102NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
anna.ns.cloudflare.com 173.245.58.102NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
anna.ns.cloudflare.com 108.162.192.102NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
anna.ns.cloudflare.com 2a06:98c1:50::ac40:2066NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
anna.ns.cloudflare.com 2606:4700:50::adf5:3a66NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
anna.ns.cloudflare.com 2803:f800:50::6ca2:c066NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
pete.ns.cloudflare.com 108.162.193.136NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
pete.ns.cloudflare.com 173.245.59.136NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
pete.ns.cloudflare.com 172.64.33.136NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
pete.ns.cloudflare.com 2606:4700:58::adf5:3b88NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
pete.ns.cloudflare.com 2a06:98c1:50::ac40:2188NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
pete.ns.cloudflare.com 2803:f800:50::6ca2:c188NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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: anna.ns.cloudflare.com: "2026.10.2"; pete.ns.cloudflare.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

warn

serial 2417579323 · primary anna.ns.cloudflare.com

Found

Primary (MNAME)
anna.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417579323
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
anna.ns.cloudflare.com (172.64.32.102)2417579323
anna.ns.cloudflare.com (173.245.58.102)2417579323
anna.ns.cloudflare.com (108.162.192.102)2417579323
anna.ns.cloudflare.com (2a06:98c1:50::ac40:2066)2417579323
anna.ns.cloudflare.com (2606:4700:50::adf5:3a66)2417579323
anna.ns.cloudflare.com (2803:f800:50::6ca2:c066)2417579323
pete.ns.cloudflare.com (108.162.193.136)2417579323
pete.ns.cloudflare.com (173.245.59.136)2417579323
pete.ns.cloudflare.com (172.64.33.136)2417579323
pete.ns.cloudflare.com (2606:4700:58::adf5:3b88)2417579323
pete.ns.cloudflare.com (2a06:98c1:50::ac40:2188)2417579323
pete.ns.cloudflare.com (2803:f800:50::6ca2:c188)2417579323

Checks

  • ✓ Serial 2417579323 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 2h46m40s, retry 40m, expire 7d, negative TTL 1m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver anna.ns.cloudflare.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 2417579323 is a Unix timestamp (2046-08-11 05:48 UTC).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Signatures valid until
23 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 013BC893C8BEA04C…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 10:14 UTC and expires at 2026-10-23 12:14 UTC.

Records

info

58 records at the apex

Found

Read from
172.64.32.102:53
TypeValueTTL
SOAanna.ns.cloudflare.com. dns.cloudflare.com. 2417579323 10000 2400 604800 6060
NSanna.ns.cloudflare.com.86400
NSpete.ns.cloudflare.com.86400
A104.16.142.237300
A104.16.143.237300
AAAA2606:4700::6810:8eed300
AAAA2606:4700::6810:8fed300
MX1 smtp.google.com.300
TXT"MS=ms39886121"120
TXT"_globalsign-domain-verification=9UioyPO0_F2Epyd3gGV5_VklXzoibTukD_jkbZPw43"120
TXT"_globalsign-domain-verification=oJsQtL3M8axaRGjlRJ4BstY+1TfWDryoeAouwRxay7A="120
TXT"_nbghqs48lzt0emavhip5o2dyy5kb0xy"120
TXT"adobe-idp-site-verification=e54c98a1c7f23b54b8ac4b7b75952259c173d7bfba731f72db60eb7ad4e63d97"120
TXT"anthropic-domain-verification-8xcn1b=XJ2EZ4D0KXPEyEAZU21FX1D94"120
TXT"apple-domain-verification=IEscmDl7jHBZDO_dBAG0xMjbBbPxomU_9rqwksKrNmk"120
TXT"apple-domain-verification=MntOsncD5C5BxosV"120
TXT"atlassian-domain-verification=YpSV2agr6k+w5lkm2ml8m8/N+xCTPcXjTKwDomeoJJTrgnmCoeRyXs/U576G4Cz2"120
TXT"atlassian-domain-verification=iztR9OQCHGIVBm5w5PmFPf1nTaqiOROSuNTF9Kv0idnfzCBmAsbfwGEF2aOK+yo4"120
TXT"calendly-site-verification=1JSBFDpdjWnwytRLc99NKaTsatZS3UFCYYp6tFThw"120
TXT"canva-site-verification=Ng9bmmu7vJyWHYrTk_wUZw"120
TXT"citrix-verification-code=6b798901-86c6-452c-a3ea-ed718cab39bd"120
TXT"cloudhealth=8d6a3d7f-ed91-4280-8422-b4b27b3dfcda"120
TXT"cursor-domain-verification-pae8cg=8gFowcF4OpBSeYJTIw0GYPFvL"120
TXT"docusign=206e891a-5b22-4d4c-9a10-85066ba89160"120
TXT"docusign=d078f828-536c-4ce3-a867-b26ad811bb8a"120
TXT"globalsign-domain-verification=Bo6R5k9s2Zwdk5OoeybGk6L2EHx_oV1TqLgGiMR4IQ"120
TXT"globalsign-domain-verification=K9ZBZYNiNsNNOiaY2Tbjn-Bfe0dWwAwpstKoOOVJWO"120
TXT"globalsign-domain-verification=fB1XzR_1Hvbw32pP6EbLFlB9r4pxcc86XOgA7B7DyV"120
TXT"google-site-verification=0Gl3_FzqmUkS2NHg_Wd5pmGiSmt_Jk4MVnaCiDbhDnY"120
TXT"google-site-verification=4E_wLzpH4XLGfUSem4QVA6mUpRJDjvZ03pG1jU56hNM"120
TXT"google-site-verification=Ca1sgMRin5VW1yxjUntivQ3-RySo8SmJcWR6zgFW_w0"120
TXT"google-site-verification=FZsUD-xuwip73XO7XfuX-4kDEY-_Qel0klHmmu6CB5k"120
TXT"google-site-verification=IKMJeRfamsooHAMaTQdFDaQ4MsfeW1Nr6F7DPDEkycg"120
TXT"google-site-verification=KR2k8MUNPfIO05_bn2-YYMLxVUsnkD-ptX-lBLPmz6M"120
TXT"google-site-verification=RuYIvfeP5e2eBgQzIaky9XuiCkkrVE2KUBULndTtFE4"120
TXT"google-site-verification=c7RTHsaBu_LU5KgIFuPCWa5yxuTrkOGYtKaYt85mrq8"120
TXT"google-site-verification=lKnsAORvM6iM1XErS9RH0TeVGG7VfTb5ST7PGx1AQ-w"120
TXT"google-site-verification=ld8CL_RjIj_FPsIdElHPqkhOMJ8Rixk1y7-s0Opi-90"120
TXT"google-site-verification=mSmGycRVFusrCec4blSh608oUai-y0AumEuI3OlaGBo"120
TXT"jamf-site-verification=L9yfsaaKM7FxdBtc5kWk6g"120
TXT"loom-site-verification=f173ba1cc44648d0ac2bbd0919868a6b"120
TXT"mint-mcp-domain-verification-3p7dva=FgfX3ooe8zSPrzYaM0SEJjugO"120
TXT"miro-verification=f165badb21a511b048a7f7a9fba3352c0db8b09b"120
TXT"onetrust-domain-verification=2a6df466515246c4a7c37104f55a82b8"120
TXT"openai-domain-verification=dv-ncbISx7kF83lZ69Xc97AoraD"120
TXT"pendo-domain-verification=595ba9d5-03ac-4aee-b50f-168214b6a32a"120
TXT"prowly-verification=bebd281d32a3e1b8140345e1f876f82eff2ba617d782c6206e7c21fd9fdbd880"120
TXT"stripe-verification=044c7ed24abd68184b0a86b00dbd47b87d1db3a5eb2ee132df5131bfc6fe29d1"120
TXT"stripe-verification=4d955ddab5b0fc6cf1931b41935e45f7997f3b13677532d11e6a90b58f5156aa"120
TXT"stripe-verification=54fa1ebf13b6990c87e17caffc4829d9600d3bd0ca60b24e6bf9ae530baf37f3"120
TXT"stripe-verification=5808adfa0c91e8dfe4ecd14f20c22ba0d54b6e8b71b23a5eada978511a246e1a"120
TXT"stripe-verification=8ad760d1d60c9bbd83b03ed7fe20a10682f7d65774aa9db13a0b524e51cefe2c"120
TXT"stripe-verification=a4f63d60cd50bfe9f3b2c2d8aa55bc596a98ab6e0f0f2e9d798c6939ece90b90"120
TXT"stripe-verification=e006b01ab77ebbe2e6c509a4e2280540bfea979f8c49ed3efd225004aa2f6292"120
TXT"stripe-verification=e2909d7f06f271e18ace56ef06db7b552e6692c312adfedaf6cea1a2e0d63125"120
TXT"twilio-domain-verification=8e64b1bb044ab98ebbd3638c1babb25a"120
TXT"v=spf1 include:_spf.google.com include:mktomail.com include:spf.mtasv.net include:mail.zendesk.com include:_spf.salesforce.com -all"120
TXT"zero-path-domain-verification-6e9hdw=BtrY4vZKLJdp2XlFj1sE4FFVG"120

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.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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