hs-koblenz.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 4 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, ns3.uni-koblenz.de, nserver1.hs-koblenz.de, nserver2.hs-koblenz.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, ns3.uni-koblenz.de, nserver1.hs-koblenz.de, nserver2.hs-koblenz.de
NS in the zone
deneb.dfn.de, ns3.uni-koblenz.de, nserver1.hs-koblenz.de, nserver2.hs-koblenz.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-
ns3.uni-koblenz.de141.26.8.53 2001:4c80:50::835AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE141.26.8.53 2001:4c80:50::835
nserver1.hs-koblenz.de143.93.243.2 2001:4c80:54::8f5d:f302AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE143.93.243.2 2001:4c80:54::8f5d:f302
nserver2.hs-koblenz.de143.93.243.7 2001:4c80:54::8f5d:f307AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE143.93.243.7 2001:4c80:54::8f5d:f307

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, ns3.uni-koblenz.de, nserver1.hs-koblenz.de, nserver2.hs-koblenz.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: nserver1.hs-koblenz.de, nserver2.hs-koblenz.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 3 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS2857 (RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE): 6 addresses; 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 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
ns3.uni-koblenz.de 141.26.8.53NOERROR, 5 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
ns3.uni-koblenz.de 2001:4c80:50::835NOERROR, 6 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
nserver1.hs-koblenz.de 143.93.243.2NOERROR, 5 ms, authoritativenoyes / yesrefused-
nserver1.hs-koblenz.de 2001:4c80:54::8f5d:f302NOERROR, 6 ms, authoritativenoyes / yesrefused-
nserver2.hs-koblenz.de 143.93.243.7NOERROR, 5 ms, authoritativenoyes / yesrefused-
nserver2.hs-koblenz.de 2001:4c80:54::8f5d:f307NOERROR, 5 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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: ns3.uni-koblenz.de: "9.18.39-0ubuntu0.24.04.8-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 2026100601 · primary nserver1.hs-koblenz.de

Found

Primary (MNAME)
nserver1.hs-koblenz.de
Contact (RNAME)
hostmaster.hs-koblenz.de
Serial
2026100601
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026100601
deneb.dfn.de (2001:638:800:1::9)2026100601
ns3.uni-koblenz.de (141.26.8.53)2026100601
ns3.uni-koblenz.de (2001:4c80:50::835)2026100601
nserver1.hs-koblenz.de (143.93.243.2)2026100601
nserver1.hs-koblenz.de (2001:4c80:54::8f5d:f302)2026100601
nserver2.hs-koblenz.de (143.93.243.7)2026100601
nserver2.hs-koblenz.de (2001:4c80:54::8f5d:f307)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 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver nserver1.hs-koblenz.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hs-koblenz.de #25
    The SOA RNAME hostmaster.hs-koblenz.de means hostmaster@hs-koblenz.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

13 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAnserver1.hs-koblenz.de. hostmaster.hs-koblenz.de. 2026100601 10800 3600 604800 8640086400
NSns3.uni-koblenz.de.86400
NSnserver1.hs-koblenz.de.86400
NSdeneb.dfn.de.86400
NSnserver2.hs-koblenz.de.86400
A143.93.243.3086400
AAAA2001:4c80:54::8f5d:f31e86400
MX10 mailgate.hs-koblenz.de.86400
TXT"cisco-ci-domain-verification=63e62f5a38face4e878528799eb7b420d63a3bd396b357f4230e540e7d2521d9"86400
TXT"adobe-idp-site-verification=bb8d34b74e5f42502f8e1fa045b66cd44ef7c146ae358b3566d0ead9aa6a3e97"86400
TXT"google-site-verification=NWJJEggOLnGAodWKYVqaARVdr7CfhRA4QfwxUYSr708"86400
TXT"v=spf1 mx ip4:143.93.243.5/32 ip4:143.93.243.11/32 ip4:143.93.243.28/32 ip4:143.93.128.4/32 ip4:143.93.143.4/32 ip4:143.93.143.40/32 ip4:143.93.240.5/32 ?all"86400
TXT"MS=1915C645376F49128C52DA112F80B267925DAC99"86400

Checks

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