securityheaders.com

Checked 22 October 2026, 10:35 UTC · via 8.8.8.8
!Passed with warnings
29 passed 1 warning 0 failed 5 info

Registration

info

.com generic · Cloudflare, Inc. · expires 2027-03-10

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Cloudflare, Inc.
Registered
10 March 2013
Last changed
4 September 2024
Expires
10 March 2027
Status
client transfer prohibited
Registry nameservers
adrian.ns.cloudflare.com, karl.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 2027-03-10 #3
    The registration is valid until 2027-03-10 (139 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

adrian.ns.cloudflare.com, karl.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
adrian.ns.cloudflare.com, karl.ns.cloudflare.com
NS in the zone
adrian.ns.cloudflare.com, karl.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
adrian.ns.cloudflare.com108.162.192.57 173.245.58.57 172.64.32.57 2606:4700:50::adf5:3a39 2803:f800:50::6ca2:c039 2a06:98c1:50::ac40:2039AS13335 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., US108.162.192.57 172.64.32.57 173.245.58.57 2606:4700:50::adf5:3a39 2803:f800:50::6ca2:c039 2a06:98c1:50::ac40:2039
karl.ns.cloudflare.com172.64.33.190 108.162.193.190 173.245.59.190 2606:4700:58::adf5:3bbe 2803:f800:50::6ca2:c1be 2a06:98c1:50::ac40:21beAS13335 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., US108.162.193.190 172.64.33.190 173.245.59.190 2606:4700:58::adf5:3bbe 2803:f800:50::6ca2:c1be 2a06:98c1:50::ac40:21be

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: adrian.ns.cloudflare.com, karl.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
adrian.ns.cloudflare.com 108.162.192.57NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
adrian.ns.cloudflare.com 173.245.58.57NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
adrian.ns.cloudflare.com 172.64.32.57NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
adrian.ns.cloudflare.com 2606:4700:50::adf5:3a39NOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.2
adrian.ns.cloudflare.com 2803:f800:50::6ca2:c039NOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.2
adrian.ns.cloudflare.com 2a06:98c1:50::ac40:2039NOERROR, 10 ms, authoritativenoyes / yesrefused2026.10.2
karl.ns.cloudflare.com 172.64.33.190NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
karl.ns.cloudflare.com 108.162.193.190NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
karl.ns.cloudflare.com 173.245.59.190NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
karl.ns.cloudflare.com 2606:4700:58::adf5:3bbeNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
karl.ns.cloudflare.com 2803:f800:50::6ca2:c1beNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
karl.ns.cloudflare.com 2a06:98c1:50::ac40:21beNOERROR, 11 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: adrian.ns.cloudflare.com: "2026.10.2"; karl.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

pass

serial 2417276336 · primary adrian.ns.cloudflare.com

Found

Primary (MNAME)
adrian.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417276336
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
adrian.ns.cloudflare.com (108.162.192.57)2417276336
adrian.ns.cloudflare.com (173.245.58.57)2417276336
adrian.ns.cloudflare.com (172.64.32.57)2417276336
adrian.ns.cloudflare.com (2606:4700:50::adf5:3a39)2417276336
adrian.ns.cloudflare.com (2803:f800:50::6ca2:c039)2417276336
adrian.ns.cloudflare.com (2a06:98c1:50::ac40:2039)2417276336
karl.ns.cloudflare.com (172.64.33.190)2417276336
karl.ns.cloudflare.com (108.162.193.190)2417276336
karl.ns.cloudflare.com (173.245.59.190)2417276336
karl.ns.cloudflare.com (2606:4700:58::adf5:3bbe)2417276336
karl.ns.cloudflare.com (2803:f800:50::6ca2:c1be)2417276336
karl.ns.cloudflare.com (2a06:98c1:50::ac40:21be)2417276336

Checks

  • ✓ Serial 2417276336 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 adrian.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 2417276336 is a Unix timestamp (2046-08-07 17:38 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 03BC0F45BA9153CF…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 09:35 UTC and expires at 2026-10-23 11:35 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

pass

30 records at the apex

Found

Read from
108.162.192.57:53
TypeValueTTL
SOAadrian.ns.cloudflare.com. dns.cloudflare.com. 2417276336 10000 2400 604800 18001800
NSadrian.ns.cloudflare.com.86400
NSkarl.ns.cloudflare.com.86400
A104.18.25.239300
A104.18.24.239300
AAAA2606:4700::6812:18ef300
AAAA2606:4700::6812:19ef300
MX1 aspmx.l.google.com.3600
MX10 alt3.aspmx.l.google.com.3600
MX10 alt4.aspmx.l.google.com.3600
MX5 alt1.aspmx.l.google.com.3600
MX5 alt2.aspmx.l.google.com.3600
TXT"brave-ledger-verification=5b485ba5c292f45f7f9eed9ff6e8d4a57970c4ae4744472900f4f1f4832637a6"300
TXT"google-site-verification=UCEy6mriyH9IDqq7R172wW0GafxRDrYE9hgd18OFIHw"300
TXT"google-site-verification=w251X-tI6DaKlmxSXZWRCAAlWl1czVeRt1mHvZ24HZw"300
TXT"h1-domain-verification=kdXQcEm5T5gzmr38FxWHjNAWnHaDsvLUmoKEfegAJoRGLTXM"300
TXT"keybase-site-verification=A02HdX9eUIIgkej7_ytW-tyWDQSKJil2mlg2OlawkEA"300
TXT"stripe-verification=6b65f329c2a4ed126677d883d21b637b2c8a52c3e6a64ac48d1b76d943099abc"300
TXT"v=spf1 include:spf.messagingengine.com include:_spf.google.com ~all"300
CAA0 issue ";"300
CAA0 issue "comodoca.com"300
CAA0 issue "digicert.com; cansignhttpexchanges=yes"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issue "ssl.com"300
CAA0 issuewild "comodoca.com"300
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"300
CAA0 issuewild "letsencrypt.org"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "ssl.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 1h, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: none (issuance forbidden), comodoca.com, digicert.com, letsencrypt.org, pki.goog, ssl.com.