tailwindcss.com

Checked 22 October 2026, 10:54 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2034-07-20

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
20 July 2017
Last changed
15 September 2026
Expires
20 July 2034
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
anuj.ns.cloudflare.com, roxy.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 2034-07-20 #3
    The registration is valid until 2034-07-20 (2828 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

info

anuj.ns.cloudflare.com, roxy.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
anuj.ns.cloudflare.com, roxy.ns.cloudflare.com
NS in the zone
anuj.ns.cloudflare.com, roxy.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
anuj.ns.cloudflare.com108.162.193.65 172.64.33.65 173.245.59.65 2803:f800:50::6ca2:c141 2a06:98c1:50::ac40:2141 2606:4700:58::adf5:3b41AS13335 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., US108.162.193.65 172.64.33.65 173.245.59.65 2606:4700:58::adf5:3b41 2803:f800:50::6ca2:c141 2a06:98c1:50::ac40:2141
roxy.ns.cloudflare.com172.64.32.142 173.245.58.142 108.162.192.142 2606:4700:50::adf5:3a8e 2803:f800:50::6ca2:c08e 2a06:98c1:50::ac40:208eAS13335 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., US108.162.192.142 172.64.32.142 173.245.58.142 2606:4700:50::adf5:3a8e 2803:f800:50::6ca2:c08e 2a06:98c1:50::ac40:208e

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: anuj.ns.cloudflare.com, roxy.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
anuj.ns.cloudflare.com 108.162.193.65NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
anuj.ns.cloudflare.com 172.64.33.65NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
anuj.ns.cloudflare.com 173.245.59.65NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
anuj.ns.cloudflare.com 2803:f800:50::6ca2:c141NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
anuj.ns.cloudflare.com 2a06:98c1:50::ac40:2141NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
anuj.ns.cloudflare.com 2606:4700:58::adf5:3b41NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
roxy.ns.cloudflare.com 172.64.32.142NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
roxy.ns.cloudflare.com 173.245.58.142NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
roxy.ns.cloudflare.com 108.162.192.142NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
roxy.ns.cloudflare.com 2606:4700:50::adf5:3a8eNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
roxy.ns.cloudflare.com 2803:f800:50::6ca2:c08eNOERROR, 8 ms, authoritativenoyes / yesrefused2026.10.2
roxy.ns.cloudflare.com 2a06:98c1:50::ac40:208eNOERROR, 5 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: anuj.ns.cloudflare.com: "2026.10.2"; roxy.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 2418117883 · primary anuj.ns.cloudflare.com

Found

Primary (MNAME)
anuj.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418117883
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
anuj.ns.cloudflare.com (108.162.193.65)2418117883
anuj.ns.cloudflare.com (172.64.33.65)2418117883
anuj.ns.cloudflare.com (173.245.59.65)2418117883
anuj.ns.cloudflare.com (2803:f800:50::6ca2:c141)2418117883
anuj.ns.cloudflare.com (2a06:98c1:50::ac40:2141)2418117883
anuj.ns.cloudflare.com (2606:4700:58::adf5:3b41)2418117883
roxy.ns.cloudflare.com (172.64.32.142)2418117883
roxy.ns.cloudflare.com (173.245.58.142)2418117883
roxy.ns.cloudflare.com (108.162.192.142)2418117883
roxy.ns.cloudflare.com (2606:4700:50::adf5:3a8e)2418117883
roxy.ns.cloudflare.com (2803:f800:50::6ca2:c08e)2418117883
roxy.ns.cloudflare.com (2a06:98c1:50::ac40:208e)2418117883

Checks

  • ✓ Serial 2418117883 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 anuj.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 2418117883 is a Unix timestamp (2046-08-17 11:24 UTC).

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

22 records at the apex

Found

Read from
108.162.193.65:53
TypeValueTTL
SOAanuj.ns.cloudflare.com. dns.cloudflare.com. 2418117883 10000 2400 604800 18001800
NSanuj.ns.cloudflare.com.86400
NSroxy.ns.cloudflare.com.86400
A172.67.68.11300
A104.26.3.143300
A104.26.2.143300
AAAA2606:4700:20::ac43:440b300
AAAA2606:4700:20::681a:28f300
AAAA2606:4700:20::681a:38f300
MX10 in1-smtp.messagingengine.com.300
MX20 in2-smtp.messagingengine.com.300
TXT"v=spf1 include:spf.messagingengine.com include:helpscoutemail.com ?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.