jclark.com

Checked 22 October 2026, 09:23 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 5 info

Registration

info

.com generic · Name106, Inc. · expires 2029-09-23

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Name106, Inc.
Registered
24 September 1991
Last changed
25 March 2024
Expires
23 September 2029
Status
client transfer prohibited
Registry nameservers
ns1135.dns.dyn.com, ns2178.dns.dyn.com, ns3173.dns.dyn.com, ns4131.dns.dyn.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 2029-09-23 #3
    The registration is valid until 2029-09-23 (1066 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

ns1135.dns.dyn.com, ns2178.dns.dyn.com, ns3173.dns.dyn.com, ns4131.dns.dyn.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1135.dns.dyn.com, ns2178.dns.dyn.com, ns3173.dns.dyn.com, ns4131.dns.dyn.com
NS in the zone
ns1135.dns.dyn.com, ns2178.dns.dyn.com, ns3173.dns.dyn.com, ns4131.dns.dyn.com
NameserverAddressesNetwork (AS)Glue
ns1135.dns.dyn.com108.59.166.201 2600:2000:2100::c9AS31898 ORACLE-BMC-31898 - Oracle Corporation, US AS31898 ORACLE-BMC-31898 - Oracle Corporation, US108.59.166.201 2600:2000:2100::c9
ns2178.dns.dyn.com108.59.168.201 2600:2000:2110::c9AS31898 ORACLE-BMC-31898 - Oracle Corporation, US AS31898 ORACLE-BMC-31898 - Oracle Corporation, US108.59.168.201 2600:2000:2110::c9
ns3173.dns.dyn.com108.59.170.201 2600:2000:2120::c9AS31898 ORACLE-BMC-31898 - Oracle Corporation, US AS31898 ORACLE-BMC-31898 - Oracle Corporation, US108.59.170.201 2600:2000:2120::c9
ns4131.dns.dyn.com108.59.172.201 2600:2000:2130::c9AS31898 ORACLE-BMC-31898 - Oracle Corporation, US AS31898 ORACLE-BMC-31898 - Oracle Corporation, US108.59.172.201 2600:2000:2130::c9

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1135.dns.dyn.com, ns2178.dns.dyn.com, ns3173.dns.dyn.com, ns4131.dns.dyn.com.
  • ✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS31898 (ORACLE-BMC-31898 - Oracle Corporation, US): 8 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

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1135.dns.dyn.com 108.59.166.201NOERROR, 65 ms, authoritativenoyes / yesrefused-
ns1135.dns.dyn.com 2600:2000:2100::c9NOERROR, 159 ms, authoritativenoyes / yesrefused-
ns2178.dns.dyn.com 108.59.168.201NOERROR, 66 ms, authoritativenoyes / yesrefused-
ns2178.dns.dyn.com 2600:2000:2110::c9NOERROR, 162 ms, authoritativenoyes / yesrefused-
ns3173.dns.dyn.com 108.59.170.201NOERROR, 65 ms, authoritativenoyes / yesrefused-
ns3173.dns.dyn.com 2600:2000:2120::c9NOERROR, 70 ms, authoritativenoyes / yesrefused-
ns4131.dns.dyn.com 108.59.172.201NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns4131.dns.dyn.com 2600:2000:2130::c9NOERROR, 173 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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

info

serial 2007081567 · primary ns1.mydyndns.org

Found

Primary (MNAME)
ns1.mydyndns.org
Contact (RNAME)
zone-admin.dyndns.com
Serial
2007081567
Refresh / retry
10800 s / 1800 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
ns1135.dns.dyn.com (108.59.166.201)2007081567
ns1135.dns.dyn.com (2600:2000:2100::c9)2007081567
ns2178.dns.dyn.com (108.59.168.201)2007081567
ns2178.dns.dyn.com (2600:2000:2110::c9)2007081567
ns3173.dns.dyn.com (108.59.170.201)2007081567
ns3173.dns.dyn.com (2600:2000:2120::c9)2007081567
ns4131.dns.dyn.com (108.59.172.201)2007081567
ns4131.dns.dyn.com (2600:2000:2130::c9)2007081567

Checks

  • ✓ Serial 2007081567 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 7d, negative TTL 30m.
  • i
    Hidden master
    The primary nameserver ns1.mydyndns.org is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact zone-admin@dyndns.com #25
    The SOA RNAME zone-admin.dyndns.com means zone-admin@dyndns.com.
  • ✓ Date-based serial #26
    The serial 2007081567 follows the YYYYMMDDnn convention (2007-08-15).

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

14 records at the apex

Found

Read from
108.59.166.201:53
TypeValueTTL
SOAns1.mydyndns.org. zone-admin.dyndns.com. 2007081567 10800 1800 604800 180086400
NSns2178.dns.dyn.com.86400
NSns4131.dns.dyn.com.86400
NSns1135.dns.dyn.com.86400
NSns3173.dns.dyn.com.86400
A119.81.18.133600
MX10 aspmx.l.google.com.3600
MX30 aspmx4.googlemail.com.3600
MX30 aspmx2.googlemail.com.3600
MX20 alt1.aspmx.l.google.com.3600
MX20 alt2.aspmx.l.google.com.3600
MX30 aspmx3.googlemail.com.3600
MX30 aspmx5.googlemail.com.3600
TXT"v=spf1 include:_spf.google.com ~all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1h, 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