ioplex.com

Checked 22 October 2026, 09:21 UTC · via 8.8.8.8
✗Problems found
22 passed 2 warnings 2 failed 5 info

Registration

info

.com generic · GoDaddy.com, LLC · expires 2033-03-13

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
13 March 2003
Last changed
12 February 2024
Expires
13 March 2033
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.linode.com, ns2.linode.com, ns3.linode.com, ns4.linode.com, ns5.linode.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 2033-03-13 #3
    The registration is valid until 2033-03-13 (2334 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.linode.com, ns2.linode.com, ns3.linode.com, ns4.linode.com, ns5.linode.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.linode.com, ns2.linode.com, ns3.linode.com, ns4.linode.com, ns5.linode.com
NS in the zone
ns1.linode.com, ns2.linode.com, ns3.linode.com, ns4.linode.com, ns5.linode.com
NameserverAddressesNetwork (AS)Glue
ns1.linode.com92.123.94.2 2600:14c0:6::2AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL2600:14c0:6::2 92.123.94.2
ns2.linode.com92.123.94.3 2600:14c0:6::3AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL2600:14c0:6::3 92.123.94.3
ns3.linode.com92.123.95.3 2600:14c0:7::3AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL2600:14c0:7::3 92.123.95.3
ns4.linode.com92.123.95.4 2600:14c0:7::4AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL2600:14c0:7::4 92.123.95.4
ns5.linode.com92.123.95.2 2600:14c0:7::2AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL2600:14c0:7::2 92.123.95.2

Checks

  • ✓ 5 nameservers #6
    Delegated to ns1.linode.com, ns2.linode.com, ns3.linode.com, ns4.linode.com, ns5.linode.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 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 10 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

fail

9 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.linode.com 92.123.94.2NOERROR, 150 ms, authoritativenoyes / yesrefused-
ns1.linode.com 2600:14c0:6::2NOERROR, 20 ms, authoritativenono / yesrefusedLinode.com DNS
ns2.linode.com 92.123.94.3NOERROR, 132 ms, authoritativenoyes / yesrefusedLinode.com DNS
ns2.linode.com 2600:14c0:6::3NOERROR, 16 ms, authoritativenoyes / yesrefusedLinode.com DNS
ns3.linode.com 92.123.95.3NOERROR, 131 ms, authoritativenoyes / yesrefusedLinode.com DNS
ns3.linode.com 2600:14c0:7::3NOERROR, 17 ms, authoritativenoyes / yesrefusedLinode.com DNS
ns4.linode.com 92.123.95.4no responsenono / no--
ns4.linode.com 2600:14c0:7::4NOERROR, 16 ms, authoritativenoyes / yesrefusedLinode.com DNS
ns5.linode.com 92.123.95.2NOERROR, 15 ms, authoritativenoyes / yesrefusedLinode.com DNS
ns5.linode.com 2600:14c0:7::2NOERROR, 16 ms, authoritativenoyes / yesrefusedLinode.com DNS

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns4.linode.com (92.123.95.4): read udp 46.225.38.91:59032->92.123.95.4:53: i/o timeout.
    #14
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.linode.com: "Linode.com DNS"; ns2.linode.com: "Linode.com DNS"; ns3.linode.com: "Linode.com DNS"; ns4.linode.com: "Linode.com DNS"; ns5.linode.com: "Linode.com DNS".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.linode.com (2600:14c0:6::2): read tcp [2a01:4f8:1c1c:eebf::1]:48868->[2600:14c0:6::2]:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 2021000035 · primary ns1.linode.com

Found

Primary (MNAME)
ns1.linode.com
Contact (RNAME)
postmaster.ioplex.com
Serial
2021000035
Refresh / retry
7200 s / 14400 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.linode.com (92.123.94.2)2021000035
ns1.linode.com (2600:14c0:6::2)2021000035
ns2.linode.com (92.123.94.3)2021000035
ns2.linode.com (2600:14c0:6::3)2021000035
ns3.linode.com (92.123.95.3)2021000035
ns3.linode.com (2600:14c0:7::3)2021000035
ns4.linode.com (2600:14c0:7::4)2021000035
ns5.linode.com (92.123.95.2)2021000035
ns5.linode.com (2600:14c0:7::2)2021000035

Checks

  • ✓ Serial 2021000035 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 4h should be shorter than refresh 2h. Current values: refresh 2h, retry 4h, expire 14d, negative TTL 1d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.linode.com is one of the listed nameservers.
  • ✓ Contact postmaster@ioplex.com #25
    The SOA RNAME postmaster.ioplex.com means postmaster@ioplex.com.
  • ✓ Timestamp serial #26
    The serial 2021000035 is a Unix timestamp (2034-01-16 04:53 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

10 records at the apex

Found

Read from
92.123.94.2:53
TypeValueTTL
SOAns1.linode.com. postmaster.ioplex.com. 2021000035 7200 14400 1209600 8640086400
NSns1.linode.com.86397
NSns5.linode.com.86397
NSns4.linode.com.86397
NSns2.linode.com.86397
NSns3.linode.com.86397
A45.79.164.9586400
MX10 mail.ioplex.com.86400
TXT"google-site-verification=qEsGnBLk_703XlFh4r60uDtDQLB2EFG5LNEUYNu6SlU"86400
TXT"v=spf1 include:outbound.mailhop.org ip4:45.79.164.95 -all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, NS 23h59m57s. The NS TTL at the parent is 2d and in the zone 23h59m57s; 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