startbootstrap.com

Checked 22 October 2026, 10:51 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · Squarespace Domains II LLC · expires 2027-08-10

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Squarespace Domains II LLC
Registered
10 August 2013
Last changed
26 July 2026
Expires
10 August 2027
Status
client delete prohibited, client transfer prohibited
Registry nameservers
mark.ns.cloudflare.com, ulla.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 2027-08-10 #3
    The registration is valid until 2027-08-10 (291 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

mark.ns.cloudflare.com, ulla.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
mark.ns.cloudflare.com, ulla.ns.cloudflare.com
NS in the zone
mark.ns.cloudflare.com, ulla.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
mark.ns.cloudflare.com173.245.59.130 108.162.193.130 172.64.33.130 2803:f800:50::6ca2:c182 2a06:98c1:50::ac40:2182 2606:4700:58::adf5:3b82AS13335 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., US108.162.193.130 172.64.33.130 173.245.59.130 2606:4700:58::adf5:3b82 2803:f800:50::6ca2:c182 2a06:98c1:50::ac40:2182
ulla.ns.cloudflare.com108.162.192.233 172.64.32.233 173.245.58.233 2a06:98c1:50::ac40:20e9 2606:4700:50::adf5:3ae9 2803:f800:50::6ca2:c0e9AS13335 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., US108.162.192.233 172.64.32.233 173.245.58.233 2606:4700:50::adf5:3ae9 2803:f800:50::6ca2:c0e9 2a06:98c1:50::ac40:20e9

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: mark.ns.cloudflare.com, ulla.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
mark.ns.cloudflare.com 173.245.59.130NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
mark.ns.cloudflare.com 108.162.193.130NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
mark.ns.cloudflare.com 172.64.33.130NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
mark.ns.cloudflare.com 2803:f800:50::6ca2:c182NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
mark.ns.cloudflare.com 2a06:98c1:50::ac40:2182NOERROR, 8 ms, authoritativenoyes / yesrefused2026.10.2
mark.ns.cloudflare.com 2606:4700:58::adf5:3b82NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
ulla.ns.cloudflare.com 108.162.192.233NOERROR, 8 ms, authoritativenoyes / yesrefused2026.10.2
ulla.ns.cloudflare.com 172.64.32.233NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
ulla.ns.cloudflare.com 173.245.58.233NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
ulla.ns.cloudflare.com 2a06:98c1:50::ac40:20e9NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
ulla.ns.cloudflare.com 2606:4700:50::adf5:3ae9NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
ulla.ns.cloudflare.com 2803:f800:50::6ca2:c0e9NOERROR, 8 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: mark.ns.cloudflare.com: "2026.10.2"; ulla.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 2417539827 · primary mark.ns.cloudflare.com

Found

Primary (MNAME)
mark.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417539827
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
mark.ns.cloudflare.com (173.245.59.130)2417539827
mark.ns.cloudflare.com (108.162.193.130)2417539827
mark.ns.cloudflare.com (172.64.33.130)2417539827
mark.ns.cloudflare.com (2803:f800:50::6ca2:c182)2417539827
mark.ns.cloudflare.com (2a06:98c1:50::ac40:2182)2417539827
mark.ns.cloudflare.com (2606:4700:58::adf5:3b82)2417539827
ulla.ns.cloudflare.com (108.162.192.233)2417539827
ulla.ns.cloudflare.com (172.64.32.233)2417539827
ulla.ns.cloudflare.com (173.245.58.233)2417539827
ulla.ns.cloudflare.com (2a06:98c1:50::ac40:20e9)2417539827
ulla.ns.cloudflare.com (2606:4700:50::adf5:3ae9)2417539827
ulla.ns.cloudflare.com (2803:f800:50::6ca2:c0e9)2417539827

Checks

  • ✓ Serial 2417539827 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 mark.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 2417539827 is a Unix timestamp (2046-08-10 18:50 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

info

13 records at the apex

Found

Read from
173.245.59.130:53
TypeValueTTL
SOAmark.ns.cloudflare.com. dns.cloudflare.com. 2417539827 10000 2400 604800 18001800
NSmark.ns.cloudflare.com.86400
NSulla.ns.cloudflare.com.86400
A104.26.1.73300
A104.26.0.73300
A172.67.73.121300
MX10 alt1.aspmx.l.google.com.300
MX20 alt2.aspmx.l.google.com.300
MX30 alt3.aspmx.l.google.com.300
MX40 alt4.aspmx.l.google.com.300
MX5 aspmx.l.google.com.300
TXT"google-site-verification=RCp5XHe1w3qWAg4PQmAuaw791G0mPKz8k1HiZpnqtTE"300
TXT"v=spf1 include:_spf.google.com include:sendgrid.net include:hubspot-inbox.com -all"300

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.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35