overleaf.com

Checked 22 October 2026, 10:11 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · Cloudflare, Inc. · expires 2027-07-02

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Cloudflare, Inc.
Registered
2 July 2008
Last changed
2 June 2026
Expires
2 July 2027
Status
client transfer prohibited
Registry nameservers
bob.ns.cloudflare.com, tori.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 2027-07-02 #3
    The registration is valid until 2027-07-02 (253 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

bob.ns.cloudflare.com, tori.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
bob.ns.cloudflare.com, tori.ns.cloudflare.com
NS in the zone
bob.ns.cloudflare.com, tori.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
bob.ns.cloudflare.com108.162.193.104 173.245.59.104 172.64.33.104 2803:f800:50::6ca2:c168 2a06:98c1:50::ac40:2168 2606:4700:58::adf5:3b68AS13335 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., US108.162.193.104 172.64.33.104 173.245.59.104 2606:4700:58::adf5:3b68 2803:f800:50::6ca2:c168 2a06:98c1:50::ac40:2168
tori.ns.cloudflare.com172.64.32.231 108.162.192.231 173.245.58.231 2a06:98c1:50::ac40:20e7 2803:f800:50::6ca2:c0e7 2606:4700:50::adf5:3ae7AS13335 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., US108.162.192.231 172.64.32.231 173.245.58.231 2606:4700:50::adf5:3ae7 2803:f800:50::6ca2:c0e7 2a06:98c1:50::ac40:20e7

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: bob.ns.cloudflare.com, tori.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
bob.ns.cloudflare.com 108.162.193.104NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 173.245.59.104NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 172.64.33.104NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 2803:f800:50::6ca2:c168NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 2a06:98c1:50::ac40:2168NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 2606:4700:58::adf5:3b68NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
tori.ns.cloudflare.com 172.64.32.231NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
tori.ns.cloudflare.com 108.162.192.231NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
tori.ns.cloudflare.com 173.245.58.231NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
tori.ns.cloudflare.com 2a06:98c1:50::ac40:20e7NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
tori.ns.cloudflare.com 2803:f800:50::6ca2:c0e7NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
tori.ns.cloudflare.com 2606:4700:50::adf5:3ae7NOERROR, 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: bob.ns.cloudflare.com: "2026.10.2"; tori.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 2418077026 · primary bob.ns.cloudflare.com

Found

Primary (MNAME)
bob.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418077026
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
bob.ns.cloudflare.com (108.162.193.104)2418077026
bob.ns.cloudflare.com (173.245.59.104)2418077026
bob.ns.cloudflare.com (172.64.33.104)2418077026
bob.ns.cloudflare.com (2803:f800:50::6ca2:c168)2418077026
bob.ns.cloudflare.com (2a06:98c1:50::ac40:2168)2418077026
bob.ns.cloudflare.com (2606:4700:58::adf5:3b68)2418077026
tori.ns.cloudflare.com (172.64.32.231)2418077026
tori.ns.cloudflare.com (108.162.192.231)2418077026
tori.ns.cloudflare.com (173.245.58.231)2418077026
tori.ns.cloudflare.com (2a06:98c1:50::ac40:20e7)2418077026
tori.ns.cloudflare.com (2803:f800:50::6ca2:c0e7)2418077026
tori.ns.cloudflare.com (2606:4700:50::adf5:3ae7)2418077026

Checks

  • ✓ Serial 2418077026 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 bob.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 2418077026 is a Unix timestamp (2046-08-17 00:03 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

34 records at the apex

Found

Read from
108.162.193.104:53
TypeValueTTL
SOAbob.ns.cloudflare.com. dns.cloudflare.com. 2418077026 10000 2400 604800 18001800
NSbob.ns.cloudflare.com.86400
NStori.ns.cloudflare.com.86400
A34.120.52.64300
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"access-domain-verification=0daf88c5fafcadd440874e7c51f081c7b2657272a54b2cbe645fed65eafc4b35"300
TXT"anthropic-domain-verification-dgsxmt=3UguzZizkuJ0tC46AHMiC7Zth"300
TXT"atlassian-domain-verification=vujOqKgTa3qfzkMqa3sYB93w6sf0XaNYcystg60SWUA7CmiVHw6q/7L0RP5NMfi3"300
TXT"coda-verification=0da304a2-6c79-4208-83ea-8f51bfc94b13"300
TXT"google-site-verification=-X9hApZ1uqsr49ba4PBLg33y2s19VcADbb7lDHGqB5g"300
TXT"google-site-verification=D0AlvSn7piou5FNy77ZNlSi3QR__xCAydRXk3NAbcpY"300
TXT"knowbe4-site-verification=c20565b6b79a0be4a2685d8bfd5f23f0"300
TXT"miro-verification=95335fdc096c06730131722de6a1b5615a5d9e78"300
TXT"pardot533712=987e1e0db8966e19cb7d54963b0e6042b2873309903471336cf0ef5e0aa09d5b"300
TXT"sending_domain533712=8746e74c9b6a667fadb708e588bf898e1880f524c64ea54e89d9356f7162eb0b"300
TXT"stripe-verification=35afa471ecf4ad55d6c9a24e770eb73c8eb82e0b387585051bc5c38b46dcf467"300
TXT"stripe-verification=5f271c389cd0644ec65428d90dbb18e77b37881ccf1bb634fd880e412476d524"300
TXT"stripe-verification=9da4d830d5c754e42da9c855f1004e4b91d92cbd2b32888a73e5c890ba53cdc0"300
TXT"v=spf1 include:_spf.google.com include:u794683.wl184.sendgrid.net include:servers.mcsv.net ~all"300
CAA0 issue "amazon.com"360
CAA0 issue "comodoca.com"360
CAA0 issue "digicert.com; cansignhttpexchanges=yes"360
CAA0 issue "letsencrypt.org"360
CAA0 issue "pki.goog; cansignhttpexchanges=yes"360
CAA0 issue "ssl.com"360
CAA0 issuewild "comodoca.com"360
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"360
CAA0 issuewild "letsencrypt.org"360
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"360
CAA0 issuewild "ssl.com"360

Checks

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