uniklinikum-saarland.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
✗Problems found
19 passed 3 warnings 1 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

deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, nse1.med-rz.uniklinik-saarland.de, nse1.uks.eu

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, nse1.med-rz.uniklinik-saarland.de, nse1.uks.eu
NS in the zone
deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, forest.uniklinikum-saarland.de, gump.uniklinikum-saarland.de, nse1.med-rz.uniklinik-saarland.de, nse1.uks.eu
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-
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-2.dfn.de193.174.75.54 2001:638:d:b102::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
forest.uniklinikum-saarland.de (zone only)134.96.149.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
gump.uniklinikum-saarland.de (zone only)134.96.149.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
nse1.med-rz.uniklinik-saarland.de134.96.155.18AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
nse1.uks.eu134.96.155.18AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 5 nameservers #6
    Delegated to deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, nse1.med-rz.uniklinik-saarland.de, nse1.uks.eu.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: forest.uniklinikum-saarland.de, gump.uniklinikum-saarland.de. deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, nse1.med-rz.uniklinik-saarland.de, nse1.uks.eu report NS deneb.dfn.de dns-1.dfn.de dns-2.dfn.de forest.uniklinikum-saarland.de gump.uniklinikum-saarland.de nse1.med-rz.uniklinik-saarland.de nse1.uks.eu.
    #7
  • ✓ 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): 10 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .eu.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: forest.uniklinikum-saarland.de, gump.uniklinikum-saarland.de, nse1.med-rz.uniklinik-saarland.de, nse1.uks.eu.
    #13

Nameservers

fail

8 of 10 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, 13 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 193.174.75.50NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 12 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 7 ms, authoritativenoyes / yesrefused0
forest.uniklinikum-saarland.de 134.96.149.1no responsenono / no--
gump.uniklinikum-saarland.de 134.96.149.2no responsenono / no--
nse1.med-rz.uniklinik-saarland.de 134.96.155.18NOERROR, 9 ms, authoritativenoyes / yesrefused-
nse1.uks.eu 134.96.155.18NOERROR, 9 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: forest.uniklinikum-saarland.de (134.96.149.1): read udp 46.225.38.91:54616->134.96.149.1:53: i/o timeout; gump.uniklinikum-saarland.de (134.96.149.2): read udp 46.225.38.91:41700->134.96.149.2:53: i/o timeout.
    #14
  • ✓ 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: deneb.dfn.de: "0"; dns-1.dfn.de: "0"; dns-2.dfn.de: "0".
    #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

warn

serial 2022179797 · primary forest.uniklinikum-saarland.de

Found

Primary (MNAME)
forest.uniklinikum-saarland.de
Contact (RNAME)
hostmaster.uniklinikum-saarland.de
Serial
2022179797
Refresh / retry
900 s / 600 s
Expire
3456000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2022179797
deneb.dfn.de (2001:638:800:1::9)2022179797
dns-1.dfn.de (193.174.75.50)2022179797
dns-1.dfn.de (2001:638:d:b101::1)2022179797
dns-2.dfn.de (193.174.75.54)2022179797
dns-2.dfn.de (2001:638:d:b102::1)2022179797
nse1.med-rz.uniklinik-saarland.de (134.96.155.18)2022179797
nse1.uks.eu (134.96.155.18)2022179797

Checks

  • ✓ Serial 2022179797 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d. Current values: refresh 15m, retry 10m, expire 40d, negative TTL 1h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver forest.uniklinikum-saarland.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uniklinikum-saarland.de #25
    The SOA RNAME hostmaster.uniklinikum-saarland.de means hostmaster@uniklinikum-saarland.de.
  • ✓ Timestamp serial #26
    The serial 2022179797 is a Unix timestamp (2034-01-29 20:36 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

15 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAforest.uniklinikum-saarland.de. hostmaster.uniklinikum-saarland.de. 2022179797 900 600 3456000 36003600
NSdns-1.dfn.de.3600
NSnse1.med-rz.uniklinik-saarland.de.3600
NSdeneb.dfn.de.3600
NSforest.uniklinikum-saarland.de.3600
NSdns-2.dfn.de.3600
NSnse1.uks.eu.3600
NSgump.uniklinikum-saarland.de.3600
A134.96.149.2600
A134.96.149.1600
MX60 mgate2.uks.eu.3600
MX50 mgate1.uks.eu.3600
TXT"v=spf1 mx ip4:134.96.155.0/24 ip4:134.96.7.0/24 ip4:134.96.40.64/28 ip6:2001:638:200:853F:0:1::/112 ~all"3600
TXT"HARICA-Al7L02Gmj9F9NtUOHNp"3600
TXT"MS=ms11260152"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 1h, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; 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