bistummainz.de

Checked 21 October 2026, 21:48 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 0 failed 5 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

info

ns.internet1.de, ns2.internet1.de, ns3.internet1.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.internet1.de, ns2.internet1.de, ns3.internet1.de
NS in the zone
ns.internet1.de, ns2.internet1.de, ns3.internet1.de
NameserverAddressesNetwork (AS)Glue
ns.internet1.de188.64.59.200 2a00:6140:103::200AS200062 Optitrust - Optitrust GmbH, DE AS200062 Optitrust - Optitrust GmbH, DE188.64.59.200 2a00:6140:103::200
ns2.internet1.de62.146.37.200 2a01:138:a03e::200AS15598 IPX-AS15598 - NorthC Deutschland GmbH, DE AS15598 IPX-AS15598 - NorthC Deutschland GmbH, DE62.146.37.200 2a01:138:a03e::200
ns3.internet1.de158.181.50.250 2a00:6140:117::200AS200062 Optitrust - Optitrust GmbH, DE AS200062 Optitrust - Optitrust GmbH, DE158.181.50.250 2a00:6140:117::200

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.internet1.de, ns2.internet1.de, ns3.internet1.de.
  • ✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15598 (IPX-AS15598 - NorthC Deutschland GmbH, DE): 2 addresses; AS200062 (Optitrust - Optitrust GmbH, DE): 4 addresses.
  • i
    All nameserver names under .de
    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

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.internet1.de 188.64.59.200NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns.internet1.de 2a00:6140:103::200NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2.internet1.de 62.146.37.200NOERROR, 1 ms, authoritativenoyes / yesrefused-
ns2.internet1.de 2a01:138:a03e::200NOERROR, 1 ms, authoritativenoyes / yesrefused-
ns3.internet1.de 158.181.50.250NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns3.internet1.de 2a00:6140:117::200NOERROR, 6 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 6 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 2025111001 · primary ns.internet1.de

Found

Primary (MNAME)
ns.internet1.de
Contact (RNAME)
hostmaster.internet1.de
Serial
2025111001
Refresh / retry
3600 s / 900 s
Expire
1209600 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
ns.internet1.de (188.64.59.200)2025111001
ns.internet1.de (2a00:6140:103::200)2025111001
ns2.internet1.de (62.146.37.200)2025111001
ns2.internet1.de (2a01:138:a03e::200)2025111001
ns3.internet1.de (158.181.50.250)2025111001
ns3.internet1.de (2a00:6140:117::200)2025111001

Checks

  • ✓ Serial 2025111001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 14d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.internet1.de is one of the listed nameservers.
  • ✓ Contact hostmaster@internet1.de #25
    The SOA RNAME hostmaster.internet1.de means hostmaster@internet1.de.
  • ✓ Date-based serial #26
    The serial 2025111001 follows the YYYYMMDDnn convention (2025-11-10).

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

7 records at the apex

Found

Read from
188.64.59.200:53
TypeValueTTL
SOAns.internet1.de. hostmaster.internet1.de. 2025111001 3600 900 1209600 18001800
NSns2.internet1.de.300
NSns.internet1.de.300
NSns3.internet1.de.300
A188.64.57.36300
MX10 mail.bistummainz.de.300
TXT"v=spf1 a mx ip4:37.202.1.53 ip4:188.64.57.23 include:_spf.internet1.de ~all"1800

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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