leetcode.com

Checked 22 October 2026, 09:34 UTC · via 8.8.8.8
!Passed with warnings
29 passed 1 warning 0 failed 5 info

Registration

info

.com generic · GoDaddy.com, LLC · expires 2034-07-11

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
11 July 2010
Last changed
25 March 2025
Expires
11 July 2034
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
melinda.ns.cloudflare.com, rob.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 2034-07-11 #3
    The registration is valid until 2034-07-11 (2818 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew 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

info

melinda.ns.cloudflare.com, rob.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
melinda.ns.cloudflare.com, rob.ns.cloudflare.com
NS in the zone
melinda.ns.cloudflare.com, rob.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
melinda.ns.cloudflare.com173.245.58.198 108.162.192.198 172.64.32.198 2a06:98c1:50::ac40:20c6 2606:4700:50::adf5:3ac6 2803:f800:50::6ca2:c0c6AS13335 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., US108.162.192.198 172.64.32.198 173.245.58.198 2606:4700:50::adf5:3ac6 2803:f800:50::6ca2:c0c6 2a06:98c1:50::ac40:20c6
rob.ns.cloudflare.com172.64.33.140 173.245.59.140 108.162.193.140 2a06:98c1:50::ac40:218c 2606:4700:58::adf5:3b8c 2803:f800:50::6ca2:c18cAS13335 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., US108.162.193.140 172.64.33.140 173.245.59.140 2606:4700:58::adf5:3b8c 2803:f800:50::6ca2:c18c 2a06:98c1:50::ac40:218c

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: melinda.ns.cloudflare.com, rob.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
melinda.ns.cloudflare.com 173.245.58.198NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
melinda.ns.cloudflare.com 108.162.192.198NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
melinda.ns.cloudflare.com 172.64.32.198NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
melinda.ns.cloudflare.com 2a06:98c1:50::ac40:20c6NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
melinda.ns.cloudflare.com 2606:4700:50::adf5:3ac6NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
melinda.ns.cloudflare.com 2803:f800:50::6ca2:c0c6NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 172.64.33.140NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 173.245.59.140NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 108.162.193.140NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 2a06:98c1:50::ac40:218cNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 2606:4700:58::adf5:3b8cNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 2803:f800:50::6ca2:c18cNOERROR, 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: melinda.ns.cloudflare.com: "2026.10.2"; rob.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 2418021647 · primary melinda.ns.cloudflare.com

Found

Primary (MNAME)
melinda.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418021647
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
melinda.ns.cloudflare.com (173.245.58.198)2418021647
melinda.ns.cloudflare.com (108.162.192.198)2418021647
melinda.ns.cloudflare.com (172.64.32.198)2418021647
melinda.ns.cloudflare.com (2a06:98c1:50::ac40:20c6)2418021647
melinda.ns.cloudflare.com (2606:4700:50::adf5:3ac6)2418021647
melinda.ns.cloudflare.com (2803:f800:50::6ca2:c0c6)2418021647
rob.ns.cloudflare.com (172.64.33.140)2418021647
rob.ns.cloudflare.com (173.245.59.140)2418021647
rob.ns.cloudflare.com (108.162.193.140)2418021647
rob.ns.cloudflare.com (2a06:98c1:50::ac40:218c)2418021647
rob.ns.cloudflare.com (2606:4700:58::adf5:3b8c)2418021647
rob.ns.cloudflare.com (2803:f800:50::6ca2:c18c)2418021647

Checks

  • ✓ Serial 2418021647 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 melinda.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 2418021647 is a Unix timestamp (2046-08-16 08:40 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 16C35E9F49DF32EC…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 08:34 UTC and expires at 2026-10-23 10:34 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

27 records at the apex

Found

Read from
173.245.58.198:53
TypeValueTTL
SOAmelinda.ns.cloudflare.com. dns.cloudflare.com. 2418021647 10000 2400 604800 18001800
NSmelinda.ns.cloudflare.com.86400
NSrob.ns.cloudflare.com.86400
A172.66.154.160300
A104.20.41.79300
AAAA2606:4700:10::6814:294f300
AAAA2606:4700:10::ac42:9aa0300
MX1 aspmx.l.google.com.300
MX10 alt3.aspmx.l.google.com.300
MX10 alt4.aspmx.l.google.com.300
MX5 alt1.aspmx.l.google.com.300
MX5 alt2.aspmx.l.google.com.300
TXT"anthropic-domain-verification-eym4e4=lH3v8Fwoae08kGLzRZQ9PW76l"300
TXT"domain-verification=6265d606aef4f770bf52dccbf18644e645dcada2b1ec0ce5a6061fb49cd55b5c"300
TXT"google-site-verification=ds0HPGUEYOzxPbBHmhQUrjDGv2-jKNpAOYcYK0dhSlw"300
TXT"google-site-verification=uPA2Afaqn3DS4X4oaTesCU4ucbWXEdQXhdtyre0mdmg"300
TXT"v=spf1 include:amazonses.com include:_spf.google.com include:mail.zendesk.com include:sendgrid.net -all"300
CAA0 issue "comodoca.com"3600
CAA0 issue "digicert.com; cansignhttpexchanges=yes"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "pki.goog; cansignhttpexchanges=yes"3600
CAA0 issue "ssl.com"3600
CAA0 issuewild "comodoca.com"3600
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"3600
CAA0 issuewild "ssl.com"3600

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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: comodoca.com, digicert.com, letsencrypt.org, pki.goog, ssl.com.