bescheinigung-forschungszulage.de

Checked 21 October 2026, 21:38 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 6 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, 6 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, 7 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 2026093001 · primary ns.internet1.de

Found

Primary (MNAME)
ns.internet1.de
Contact (RNAME)
hostmaster.internet1.de
Serial
2026093001
Refresh / retry
3600 s / 900 s
Expire
1209600 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
ns.internet1.de (188.64.59.200)2026093001
ns.internet1.de (2a00:6140:103::200)2026093001
ns2.internet1.de (62.146.37.200)2026093001
ns2.internet1.de (2a01:138:a03e::200)2026093001
ns3.internet1.de (158.181.50.250)2026093001
ns3.internet1.de (2a00:6140:117::200)2026093001

Checks

  • ✓ Serial 2026093001 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 2026093001 follows the YYYYMMDDnn convention (2026-09-30).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC
Signatures valid until
29 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
31821KSK (257)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

8 records at the apex

Found

Read from
188.64.59.200:53
TypeValueTTL
SOAns.internet1.de. hostmaster.internet1.de. 2026093001 3600 900 1209600 18001800
NSns.internet1.de.3600
NSns2.internet1.de.3600
NSns3.internet1.de.3600
A158.181.50.94300
MX0 mail.bescheinigung-forschungszulage.de.300
TXT"v=spf1 ip4:158.181.50.247 ip6:2a00:6140:a000:193::10 include:_spf.sendnode.com -all"300
TXT"globalsign-domain-verification=iDf8on8Dl4H5rGKqw_ehfqFaOOAwzxslh_xrMd-QOm"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; 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