hs-niederrhein.de

Checked 21 October 2026, 22:51 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

info

deneb.dfn.de, hermes.hs-niederrhein.de, kastor.hs-niederrhein.de, kentro.hs-niederrhein.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, hermes.hs-niederrhein.de, kastor.hs-niederrhein.de, kentro.hs-niederrhein.de
NS in the zone
deneb.dfn.de, hermes.hs-niederrhein.de, kastor.hs-niederrhein.de, kentro.hs-niederrhein.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
hermes.hs-niederrhein.de194.94.124.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.124.1
kastor.hs-niederrhein.de194.94.120.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.120.2
kentro.hs-niederrhein.de194.94.120.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.120.1

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, hermes.hs-niederrhein.de, kastor.hs-niederrhein.de, kentro.hs-niederrhein.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: hermes.hs-niederrhein.de, kastor.hs-niederrhein.de, kentro.hs-niederrhein.de.
  • ✓ 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 1 IPv6 /48.
  • 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: hermes.hs-niederrhein.de, kastor.hs-niederrhein.de, kentro.hs-niederrhein.de.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
hermes.hs-niederrhein.de 194.94.124.1NOERROR, 10 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-Ubuntu
kastor.hs-niederrhein.de 194.94.120.2NOERROR, 9 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
kentro.hs-niederrhein.de 194.94.120.1NOERROR, 9 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-Ubuntu

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: hermes.hs-niederrhein.de: "9.18.39-0ubuntu0.22.04.7-Ubuntu"; kastor.hs-niederrhein.de: "9.18.39-0ubuntu0.24.04.8-Ubuntu"; kentro.hs-niederrhein.de: "9.18.39-0ubuntu0.22.04.7-Ubuntu". Hide or replace the version string.
    #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 2026093001 · primary kentro.hs-niederrhein.de

Found

Primary (MNAME)
kentro.hs-niederrhein.de
Contact (RNAME)
hostmaster.hs-niederrhein.de
Serial
2026093001
Refresh / retry
28800 s / 7200 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026093001
deneb.dfn.de (2001:638:800:1::9)2026093001
hermes.hs-niederrhein.de (194.94.124.1)2026093001
kastor.hs-niederrhein.de (194.94.120.2)2026093001
kentro.hs-niederrhein.de (194.94.120.1)2026093001

Checks

  • ✓ Serial 2026093001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver kentro.hs-niederrhein.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hs-niederrhein.de #25
    The SOA RNAME hostmaster.hs-niederrhein.de means hostmaster@hs-niederrhein.de.
  • ✓ Date-based serial #26
    The serial 2026093001 follows the YYYYMMDDnn convention (2026-09-30).

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

17 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAkentro.hs-niederrhein.de. hostmaster.hs-niederrhein.de. 2026093001 28800 7200 1209600 8640086400
NShermes.hs-niederrhein.de.86400
NSkastor.hs-niederrhein.de.86400
NSkentro.hs-niederrhein.de.86400
NSdeneb.dfn.de.86400
A194.94.120.8886400
MX10 eos.hs-niederrhein.de.3600
TXT"spycloud-domain-verification=825aa988-9628-43cf-b3b9-735c98caf7f3"3600
TXT"68d0e77efd0f2c4ad3001b4fe0ce165c"3600
TXT"_telesec-domain-validation=350464_2026-06-09_rUhFZriNkHddkNg9kDD3Yny1qrdQ758goNjC7dpZkXShDDDcyO"3600
TXT"_telesec-domain-validation=2026-06-09_oAmRZRhbGSa9DOEgaTenbwnZDDHT4uF0YZbiNf58iHG6uZLjD4"3600
TXT"2e500120b18144d6a0eb61f485c59f98"3600
TXT"v=spf1 ip4:194.94.120.0/27 ip4:193.30.112.1 ip4:193.30.112.2 ip4:193.30.112.74 ip4:193.30.112.106 ip4:95.172.90.143 ip4:95.172.90.156 ip4:216.147.218.8/30 ip4:93.190.66.6/32 ip4:185.134.242.25/32 include:mailgun.org ~all"3600
TXT"ZOOM_verify_8lnS4GHKRsOJx2gc6IvGuw"3600
TXT"adobe-idp-site-verification=6b5f61961102a6c5fa1f5eaa743148ed8b8f0ac00a0c0c449f6a79fff0ec1a40"3600
TXT"MS=1104F630D53E51480CFB6802F071132B00341763"3600
TXT"google-site-verification=f9Mn_jz8KL-8E7T7MZoo6AB7Y15PDT8Ua9e8AD0sjSI"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1h, 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