shuttle.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 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

warn

ns1.dfn.de, ns2.dfn.de, ns3.dfn.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.dfn.de, ns2.dfn.de, ns3.dfn.de
NS in the zone
ns1.dfn.de, ns2.dfn.de, ns3.dfn.de
NameserverAddressesNetwork (AS)Glue
ns1.dfn.de194.95.236.51 2001:638:d:c110::51AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.95.236.51 2001:638:d:c110::51
ns2.dfn.de194.95.236.59 2001:638:d:c111::59AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.95.236.59 2001:638:d:c111::59
ns3.dfn.de194.95.236.67AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.95.236.67

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.dfn.de, ns2.dfn.de, ns3.dfn.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 one network
    all IPv4 addresses are in 194.95.236.0/24; all IPv6 addresses are in 2001:638:d::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 5 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 .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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns3.dfn.de.
    #13

Nameservers

pass

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dfn.de 194.95.236.51NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns1.dfn.de 2001:638:d:c110::51NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2.dfn.de 194.95.236.59NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns2.dfn.de 2001:638:d:c111::59NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns3.dfn.de 194.95.236.67NOERROR, 12 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 5 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 1764326979 · primary ns1.dfn.de

Found

Primary (MNAME)
ns1.dfn.de
Contact (RNAME)
hostmaster.dfn.de
Serial
1764326979
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.dfn.de (194.95.236.51)1764326979
ns1.dfn.de (2001:638:d:c110::51)1764326979
ns2.dfn.de (194.95.236.59)1764326979
ns2.dfn.de (2001:638:d:c111::59)1764326979
ns3.dfn.de (194.95.236.67)1764326979

Checks

  • ✓ Serial 1764326979 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.dfn.de is one of the listed nameservers.
  • ✓ Contact hostmaster@dfn.de #25
    The SOA RNAME hostmaster.dfn.de means hostmaster@dfn.de.
  • ✓ Timestamp serial #26
    The serial 1764326979 is a Unix timestamp (2025-11-28 10:49 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

8 records at the apex

Found

Read from
194.95.236.51:53
TypeValueTTL
SOAns1.dfn.de. hostmaster.dfn.de. 1764326979 10800 3600 604800 8640086400
NSns3.dfn.de.86400
NSns2.dfn.de.86400
NSns1.dfn.de.86400
MX10 c1001.mx.srv.dfn.de.86400
MX10 a1001.mx.srv.dfn.de.86400
MX10 b1001.mx.srv.dfn.de.86400
TXT"v=spf1 include:_spf.s1004.mx.srv.dfn.de ~all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: MX 1d, NS 1d.
  • ✓ 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