signalvnoise.com

Checked 22 October 2026, 10:42 UTC · via 8.8.8.8
!Passed with warnings
24 passed 3 warnings 0 failed 4 info

Registration

info

.com generic · Cloudflare, Inc. · expires 2027-01-16

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Cloudflare, Inc.
Registered
16 January 2014
Last changed
17 December 2025
Expires
16 January 2027
Status
client transfer prohibited
Registry nameservers
merlin.ns.cloudflare.com, serena.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 2027-01-16 #3
    The registration is valid until 2027-01-16 (86 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

merlin.ns.cloudflare.com, serena.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
merlin.ns.cloudflare.com, serena.ns.cloudflare.com
NS in the zone
merlin.ns.cloudflare.com, serena.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
merlin.ns.cloudflare.com173.245.59.205 108.162.193.205 172.64.33.205 2803:f800:50::6ca2:c1cd 2a06:98c1:50::ac40:21cd 2606:4700:58::adf5:3bcdAS13335 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., US108.162.193.205 172.64.33.205 173.245.59.205 2606:4700:58::adf5:3bcd 2803:f800:50::6ca2:c1cd 2a06:98c1:50::ac40:21cd
serena.ns.cloudflare.com108.162.192.220 172.64.32.220 173.245.58.220 2803:f800:50::6ca2:c0dc 2606:4700:50::adf5:3adc 2a06:98c1:50::ac40:20dcAS13335 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., US108.162.192.220 172.64.32.220 173.245.58.220 2606:4700:50::adf5:3adc 2803:f800:50::6ca2:c0dc 2a06:98c1:50::ac40:20dc

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: merlin.ns.cloudflare.com, serena.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
merlin.ns.cloudflare.com 173.245.59.205NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 108.162.193.205NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 172.64.33.205NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 2803:f800:50::6ca2:c1cdNOERROR, 8 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 2a06:98c1:50::ac40:21cdNOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 2606:4700:58::adf5:3bcdNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 108.162.192.220NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 172.64.32.220NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 173.245.58.220NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 2803:f800:50::6ca2:c0dcNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 2606:4700:50::adf5:3adcNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 2a06:98c1:50::ac40:20dcNOERROR, 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: merlin.ns.cloudflare.com: "2026.10.2"; serena.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 2418145529 · primary merlin.ns.cloudflare.com

Found

Primary (MNAME)
merlin.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418145529
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
merlin.ns.cloudflare.com (173.245.59.205)2418145529
merlin.ns.cloudflare.com (108.162.193.205)2418145529
merlin.ns.cloudflare.com (172.64.33.205)2418145529
merlin.ns.cloudflare.com (2803:f800:50::6ca2:c1cd)2418145529
merlin.ns.cloudflare.com (2a06:98c1:50::ac40:21cd)2418145529
merlin.ns.cloudflare.com (2606:4700:58::adf5:3bcd)2418145529
serena.ns.cloudflare.com (108.162.192.220)2418145529
serena.ns.cloudflare.com (172.64.32.220)2418145529
serena.ns.cloudflare.com (173.245.58.220)2418145529
serena.ns.cloudflare.com (2803:f800:50::6ca2:c0dc)2418145529
serena.ns.cloudflare.com (2606:4700:50::adf5:3adc)2418145529
serena.ns.cloudflare.com (2a06:98c1:50::ac40:20dc)2418145529

Checks

  • ✓ Serial 2418145529 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 merlin.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 2418145529 is a Unix timestamp (2046-08-17 19:05 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

21 records at the apex

Found

Read from
173.245.59.205:53
TypeValueTTL
SOAmerlin.ns.cloudflare.com. dns.cloudflare.com. 2418145529 10000 2400 604800 6060
NSmerlin.ns.cloudflare.com.86400
NSserena.ns.cloudflare.com.86400
A104.18.29.173300
A104.18.28.173300
TXT"1r89zx2snxmj32vf971pc04qs7spkyrs"300
TXT"4rv2lf0xbwpqgw4dfxc894hvhjy41cmn"300
TXT"8dfd0zb0hc1r8hc6d61784gfqdxsknmk"300
TXT"xc87v0fklpk2nyghfkq99zwcgt2p6hnb"300
CAA0 iodef "mailto:sysadmins@37signals.com"60
CAA0 issue "amazon.com"60
CAA0 issue "comodoca.com"60
CAA0 issue "digicert.com; cansignhttpexchanges=yes"60
CAA0 issue "letsencrypt.org"60
CAA0 issue "pki.goog; cansignhttpexchanges=yes"60
CAA0 issue "ssl.com"60
CAA0 issuewild "comodoca.com"60
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"60
CAA0 issuewild "letsencrypt.org"60
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"60
CAA0 issuewild "ssl.com"60

Checks

  • ✓ TTLs within range #32
    TTLs: A 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: amazon.com, comodoca.com, digicert.com, letsencrypt.org, pki.goog, ssl.com.