linux.com

Checked 22 October 2026, 09:36 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 3 info

Registration

info

.com generic · 1API GmbH · expires 2027-06-01

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
1API GmbH
Registered
2 June 1994
Last changed
27 May 2026
Expires
1 June 2027
Status
client transfer prohibited
Registry nameservers
ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org
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 2027-06-01 #3
    The registration is valid until 2027-06-01 (221 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

ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org
NS in the zone
ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org
NameserverAddressesNetwork (AS)Glue
ns1.dnsimple-edge.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-edge.net199.247.153.53 2620:111:8005::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-
ns3.dnsimple-edge.io199.247.154.53 2620:111:8006::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-
ns4.dnsimple-edge.org199.247.155.53 2620:111:8007::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org.
  • ✓ 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
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .io, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dnsimple-edge.com 199.247.152.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.dnsimple-edge.com 2620:111:8004::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.dnsimple-edge.net 199.247.153.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.dnsimple-edge.net 2620:111:8005::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.dnsimple-edge.io 199.247.154.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.dnsimple-edge.io 2620:111:8006::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns4.dnsimple-edge.org 199.247.155.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns4.dnsimple-edge.org 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 1557514295 · primary ns1.dnsimple-edge.com

Found

Primary (MNAME)
ns1.dnsimple-edge.com
Contact (RNAME)
admin.dnsimple.com
Serial
1557514295
Refresh / retry
86400 s / 7200 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.dnsimple-edge.com (199.247.152.53)1557514295
ns1.dnsimple-edge.com (2620:111:8004::53)1557514295
ns2.dnsimple-edge.net (199.247.153.53)1557514295
ns2.dnsimple-edge.net (2620:111:8005::53)1557514295
ns3.dnsimple-edge.io (199.247.154.53)1557514295
ns3.dnsimple-edge.io (2620:111:8006::53)1557514295
ns4.dnsimple-edge.org (199.247.155.53)1557514295
ns4.dnsimple-edge.org (2620:111:8007::53)1557514295

Checks

  • ✓ Serial 1557514295 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-edge.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 1557514295 is a Unix timestamp (2019-05-10 18:51 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

17 records at the apex

Found

Read from
199.247.152.53:53
TypeValueTTL
SOAns1.dnsimple-edge.com. admin.dnsimple.com. 1557514295 86400 7200 604800 3003600
NSns1.dnsimple-edge.com.3600
NSns2.dnsimple-edge.net.3600
NSns3.dnsimple-edge.io.3600
NSns4.dnsimple-edge.org.3600
A23.185.0.3300
AAAA2620:12a:8000::3300
AAAA2620:12a:8001::3300
MX10 mx1.forwardemail.net.600
MX10 mx2.forwardemail.net.600
TXT"8112310.spf10.hubspotemail.net"60
TXT"v=spf1 ip4:198.145.29.98 include:_spf.google.com include:amazonses.com include:mailgun.org include:spf.forwardemail.net include:spf.messagingengine.com ~all"60
TXT"globalsign-domain-verification=GAw3QxpoQCUd6MEBcIrvwmn1548c2kZ_M8jDU57Ho3"300
TXT"google-site-verification=AqV3SU_MRUY0GYnNYAKi_6pa0S1WU7hfq5SapcMUycI"300
TXT"google-site-verification=SDW6U9788xC80xinO4aDxrgD4bkaCjLozXPv4R7oMbk"300
TXT"google-site-verification=oGlHyAcoij5H-f9oD_WyPZLySBNASgAGQxkmbrKFblo"300
TXT"forward-email-site-verification=JV5pfF4sKV"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 10m, 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.
  • 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