dhsn.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 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

warn

ns-fsn.dssax.de, ns1.dssax.de, ns4.dssax.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-fsn.dssax.de, ns1.dssax.de, ns4.dssax.de
NS in the zone
ns-fsn.dssax.de, ns1.dssax.de, ns4.dssax.de
NameserverAddressesNetwork (AS)Glue
ns-fsn.dssax.de94.130.28.149AS24940 HETZNER-AS - Hetzner Online GmbH, DE94.130.28.149
ns1.dssax.de194.94.226.35AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns4.dssax.de194.95.197.229AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns-fsn.dssax.de, ns1.dssax.de, ns4.dssax.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 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 1 address; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-fsn.dssax.de 94.130.28.149NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns1.dssax.de 194.94.226.35NOERROR, 18 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.dssax.de 194.95.197.229NOERROR, 14 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

Checks

  • ✓ All respond #14
    All 3 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns-fsn.dssax.de: "Served by PowerDNS - https://www.powerdns.com/"; ns1.dssax.de: "Served by PowerDNS - https://www.powerdns.com/"; ns4.dssax.de: "Served by PowerDNS - https://www.powerdns.com/".
    #17
  • ✓ 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 2026100601 · primary ns4.dssax.de

Found

Primary (MNAME)
ns4.dssax.de
Contact (RNAME)
hostmaster.dssax.de
Serial
2026100601
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns-fsn.dssax.de (94.130.28.149)2026100601
ns1.dssax.de (194.94.226.35)2026100601
ns4.dssax.de (194.95.197.229)2026100601

Checks

  • ✓ Serial 2026100601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns4.dssax.de is one of the listed nameservers.
  • ✓ Contact hostmaster@dssax.de #25
    The SOA RNAME hostmaster.dssax.de means hostmaster@dssax.de.
  • ✓ Date-based serial #26
    The serial 2026100601 follows the YYYYMMDDnn convention (2026-10-06).

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

14 records at the apex

Found

Read from
94.130.28.149:53
TypeValueTTL
SOAns4.dssax.de. hostmaster.dssax.de. 2026100601 10800 3600 604800 600300
NSns4.dssax.de.300
NSns-fsn.dssax.de.300
NSns1.dssax.de.300
A194.95.197.225300
MX10 limes.ba-glauchau.de.3600
TXT"HARICA-Uvj0Ztt1Pj7zLeoWkpv"300
TXT"v=spf1 a mx include:spf.emailsignatures365.com include:spf.postal.simplytech.io include:spf.postal.ba-sachsen.de include:spf.postal.dhsn.de include:spf.limes.ba-glauchau.de include:spf.limes-backup.ba-glauchau.de include:spf.postfix.dhsn.de ip4:141.44.39" ".139 ~all"300
TXT"adobe-idp-site-verification=010aba8de97ec64675ddc0a88eb383f9c63ef4bc245263bd0f6f53cc75deadd3"300
TXT"MS=ms52781185"300
TXT"cisco-ci-domain-verification=7db1b568be422786b2bd03e6d465c719c9df42363b50c3dc171fa9cada2bdc1a"300
TXT"DirectFedAuthUrl=https://idp.dhsn.de/saml/login"300
TXT"HARICA-yC6atZKICafOapJtbmD"300
TXT"atlassian-domain-verification=cpx2GupMHNCQ6xi3HTu97sRcV6/B3MMGD8P3ThD/klPnO0RcAURqD6wVLeM33WNr"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1h, 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.
  • ✓ 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