nngroup.com

Checked 22 October 2026, 10:03 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 3 info

Registration

info

.com generic · GoDaddy.com, LLC · expires 2029-01-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
7 August 1998
Last changed
24 September 2024
Expires
9 January 2029
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.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 2029-01-09 #3
    The registration is valid until 2029-01-09 (810 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew 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

ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.com
NS in the zone
ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.com
NameserverAddressesNetwork (AS)Glue
ns1.dnsimple.com199.247.152.53 2620:111:8004::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US199.247.152.53 2620:111:8004::53
ns2.dnsimple.com199.247.153.53 2620:111:8005::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US199.247.153.53 2620:111:8005::53
ns3.dnsimple.com199.247.154.53 2620:111:8006::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US199.247.154.53 2620:111:8006::53
ns4.dnsimple.com199.247.155.53 2620:111:8007::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US199.247.155.53 2620:111:8007::53

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.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 (AS32771 (DNSIMPLE - DNSimple 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
ns1.dnsimple.com 199.247.152.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.dnsimple.com 2620:111:8004::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.dnsimple.com 199.247.153.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.dnsimple.com 2620:111:8005::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.dnsimple.com 199.247.154.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.dnsimple.com 2620:111:8006::53NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns4.dnsimple.com 199.247.155.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns4.dnsimple.com 2620:111:8007::53NOERROR, 13 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

pass

serial 1463597545 · primary ns1.dnsimple.com

Found

Primary (MNAME)
ns1.dnsimple.com
Contact (RNAME)
admin.dnsimple.com
Serial
1463597545
Refresh / retry
86400 s / 7200 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.dnsimple.com (199.247.152.53)1463597545
ns1.dnsimple.com (2620:111:8004::53)1463597545
ns2.dnsimple.com (199.247.153.53)1463597545
ns2.dnsimple.com (2620:111:8005::53)1463597545
ns3.dnsimple.com (199.247.154.53)1463597545
ns3.dnsimple.com (2620:111:8006::53)1463597545
ns4.dnsimple.com (199.247.155.53)1463597545
ns4.dnsimple.com (2620:111:8007::53)1463597545

Checks

  • ✓ Serial 1463597545 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.dnsimple.com is one of the listed nameservers.
  • ✓ Contact admin@dnsimple.com #25
    The SOA RNAME admin.dnsimple.com means admin@dnsimple.com.
  • ✓ Timestamp serial #26
    The serial 1463597545 is a Unix timestamp (2016-05-18 18:52 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

24 records at the apex

Found

Read from
199.247.152.53:53
TypeValueTTL
SOAns1.dnsimple.com. admin.dnsimple.com. 1463597545 86400 7200 604800 3003600
NSns1.dnsimple.com.3600
NSns2.dnsimple.com.3600
NSns3.dnsimple.com.3600
NSns4.dnsimple.com.3600
A192.124.249.1133600
MX0 aspmx.l.google.com.86400
MX10 alt1.aspmx.l.google.com.86400
MX10 alt2.aspmx.l.google.com.86400
MX25 aspmx2.googlemail.com.86400
MX25 aspmx3.googlemail.com.86400
TXT" google-site-verification=kyKsox8uvugkyoBLGufbebnw7LDgx8ZkCszXdonndtk"3600
TXT"CF9424EB1D"3600
TXT"google-site-verification=Nkz-QAR-TpsDAoezza4B_kBCbO4J3_eW9KRtiTkmFMk"3600
TXT"v=spf1 include:teamdesk.net include:amazonses.com include:_spf.google.com include:servers.mcsv.net include:app.sgizmo.com include:mail.zendesk.com ~all"3600
TXT"google-site-verification=yyaEQxusOE5A3328gnCZrCr7VcLdIKXSBW1NbRpQpb8"86400
CAA0 iodef "mailto:support@nngroup.com"3600
CAA0 issue "amazonaws.com"3600
CAA0 issue "godaddy.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "sectigo.com"3600
CAA0 issue "starfieldtech.com"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 issuewild "sectigo.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1d, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; 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: amazonaws.com, godaddy.com, letsencrypt.org, sectigo.com, starfieldtech.com.