ku-eichstaett.de

Checked 21 October 2026, 23:10 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

info

dns-1.dfn.de, dns-3.dfn.de, ns.ku.de, ns3.rrze.uni-erlangen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, dns-3.dfn.de, ns.ku.de, ns3.rrze.uni-erlangen.de
NS in the zone
dns-1.dfn.de, dns-3.dfn.de, ns.ku.de, ns3.rrze.uni-erlangen.de
NameserverAddressesNetwork (AS)Glue
dns-1.dfn.de193.174.75.50 2001:638:d:b101::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns.ku.de141.78.7.250AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.78.7.250
ns3.rrze.uni-erlangen.de131.188.0.52 131.188.3.4 2001:638:a000:1001:53::3 2001:638:a000:1055:53::3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-1.dfn.de, dns-3.dfn.de, ns.ku.de, ns3.rrze.uni-erlangen.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 4 IPv4 /24s and 2 IPv6 /48s.
  • 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): 9 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: ns.ku.de.
    #13

Nameservers

warn

9 of 9 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 13 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 18 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 11 ms, authoritativenoyes / yesrefused0
ns.ku.de 141.78.7.250NOERROR, 9 ms, authoritativenoyes / yesrefused9.11.22
ns3.rrze.uni-erlangen.de 131.188.0.52NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns3.rrze.uni-erlangen.de 131.188.3.4NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns3.rrze.uni-erlangen.de 2001:638:a000:1001:53::3NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns3.rrze.uni-erlangen.de 2001:638:a000:1055:53::3NOERROR, 7 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 9 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: ns.ku.de: "9.11.22". 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 202610216 · primary ns.ku.de

Found

Primary (MNAME)
ns.ku.de
Contact (RNAME)
netzadm.ku.de
Serial
202610216
Refresh / retry
21600 s / 3600 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)202610216
dns-1.dfn.de (2001:638:d:b101::1)202610216
dns-3.dfn.de (193.174.75.58)202610216
dns-3.dfn.de (2001:638:d:b103::1)202610216
ns.ku.de (141.78.7.250)202610216
ns3.rrze.uni-erlangen.de (131.188.0.52)202610216
ns3.rrze.uni-erlangen.de (131.188.3.4)202610216
ns3.rrze.uni-erlangen.de (2001:638:a000:1001:53::3)202610216
ns3.rrze.uni-erlangen.de (2001:638:a000:1055:53::3)202610216

Checks

  • ✓ Serial 202610216 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.ku.de is one of the listed nameservers.
  • ✓ Contact netzadm@ku.de #25
    The SOA RNAME netzadm.ku.de means netzadm@ku.de.
  • ✓ Counter serial #26
    The serial 202610216 is a plain counter.

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

16 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOAns.ku.de. netzadm.ku.de. 202610216 21600 3600 3600000 8640086400
NSns3.rrze.uni-erlangen.de.86400
NSns.ku.de.86400
NSdns-3.dfn.de.86400
NSdns-1.dfn.de.86400
A141.78.7.19886400
MX10 b1041.mx.srv.dfn.de.86400
MX10 a1041.mx.srv.dfn.de.86400
MX10 c1041.mx.srv.dfn.de.86400
TXT"facebook-domain-verification=86dqwz7qhtmht0hpynl65cfdh5mf29"3600
TXT"MS=FFD6B770542665E4F0A14DC1F7F5199DB1ED3075"3600
TXT"google-site-verification=eUCVOD4Wmcs9961Pt65s-V8hmv8RPY2D2j-0EGhVhPw"3600
TXT"adobe-idp-site-verification=d4cdce37079df62376fd999e8025c400e1940edaa74fe99ddeeab8d8b5d99729"3600
TXT"google-site-verification=or3zmlmQAEZd_z3cUDTm23MXGZF0XdOvUdieC-hVzIU"3600
TXT"apple-domain-verification=497qMZv7r5v1n6iC"3600
TXT"v=spf1 ip4:141.78.0.0/18 ip4:141.78.64.0/19 ip4:141.78.96.0/22 ip4:141.78.104.0/21 ip4:141.78.112.0/20 ip4:141.78.192.0/18 a:bvbvxmail.bib-bvb.de a:mailer02.zib.de ip4:5.9.79.165 ip4:159.69.247.208 ip4:23.88.47.24 include:mailgun.org ~all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 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