udk-berlin.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
22 passed 1 warning 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

barock.udk-berlin.de, bauhaus.udk-berlin.de, dns-2.dfn.de, dns-3.dfn.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
barock.udk-berlin.de, bauhaus.udk-berlin.de, dns-2.dfn.de, dns-3.dfn.de
NS in the zone
barock.udk-berlin.de, bauhaus.udk-berlin.de, dns-2.dfn.de, dns-3.dfn.de
NameserverAddressesNetwork (AS)Glue
barock.udk-berlin.de194.95.94.37 2001:638:811:4500::37AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.95.94.37 2001:638:811:4500::37
bauhaus.udk-berlin.de194.95.94.35 2001:638:811:4500::35AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.95.94.35 2001:638:811:4500::35
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-
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-

Checks

  • ✓ 4 nameservers #6
    Delegated to barock.udk-berlin.de, bauhaus.udk-berlin.de, dns-2.dfn.de, dns-3.dfn.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: barock.udk-berlin.de, bauhaus.udk-berlin.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 2 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): 8 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
barock.udk-berlin.de 194.95.94.37NOERROR, 13 ms, authoritativenoyes / yesrefused[NONE]
barock.udk-berlin.de 2001:638:811:4500::37NOERROR, 13 ms, authoritativenoyes / yesrefused[NONE]
bauhaus.udk-berlin.de 194.95.94.35NOERROR, 12 ms, authoritativenoyes / yesrefused[NONE]
bauhaus.udk-berlin.de 2001:638:811:4500::35NOERROR, 13 ms, authoritativenoyes / yesrefused[NONE]
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
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 8 ms, authoritativenoyes / yesrefused0

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: barock.udk-berlin.de: "[NONE]"; bauhaus.udk-berlin.de: "[NONE]"; dns-2.dfn.de: "0"; dns-3.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

pass

serial 2011031997 · primary bauhaus.udk-berlin.de

Found

Primary (MNAME)
bauhaus.udk-berlin.de
Contact (RNAME)
domainmaster.udk-berlin.de
Serial
2011031997
Refresh / retry
28800 s / 14400 s
Expire
3024000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
barock.udk-berlin.de (194.95.94.37)2011031997
barock.udk-berlin.de (2001:638:811:4500::37)2011031997
bauhaus.udk-berlin.de (194.95.94.35)2011031997
bauhaus.udk-berlin.de (2001:638:811:4500::35)2011031997
dns-2.dfn.de (193.174.75.54)2011031997
dns-2.dfn.de (2001:638:d:b102::1)2011031997
dns-3.dfn.de (193.174.75.58)2011031997
dns-3.dfn.de (2001:638:d:b103::1)2011031997

Checks

  • ✓ Serial 2011031997 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 4h, expire 35d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver bauhaus.udk-berlin.de is one of the listed nameservers.
  • ✓ Contact domainmaster@udk-berlin.de #25
    The SOA RNAME domainmaster.udk-berlin.de means domainmaster@udk-berlin.de.
  • ✓ Date-based serial #26
    The serial 2011031997 follows the YYYYMMDDnn convention (2011-03-19).

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

18 records at the apex

Found

Read from
194.95.94.37:53
TypeValueTTL
SOAbauhaus.udk-berlin.de. domainmaster.udk-berlin.de. 2011031997 28800 14400 3024000 86400600
NSdns-2.dfn.de.600
NSdns-3.dfn.de.600
NSbarock.udk-berlin.de.600
NSbauhaus.udk-berlin.de.600
A167.233.12.206600
MX100 c2671.mx.srv.dfn.de.600
MX100 a2671.mx.srv.dfn.de.600
MX100 b2671.mx.srv.dfn.de.600
TXT"MS=63C264599FCBB9C78BC033BD88E79E56966E7BF7"3600
TXT"cisco-ci-domain-verification=ef8f684c6a993ba82391cbe24a9cce9774334bf53442f15f3f21618c5dab4ee"3600
TXT"adobe-idp-site-verification=b92c9f190561870e16ce4d69978ac1ee210337b47e3305e31e16803339cec7a3"3600
TXT"v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq8GBfddDhqDLWB4/QJWlYeM70D3un2hcSKa+zrWry5NIVoLxfY9jmOBvZLJnmSQUSR/URomp912MMRlJAO2QSmHPgIvgnhCSBGK6TJmc9DcNKIeuoXB8X2M9EgOcMXzfIzAu04Z/fj/2HJHiGIutF/bbH/2e7Zakw5T5vqw9tFuEiO1t8PZYgvsnF4QK" "u8oSyyNhELIx/2twVVcN3PgaNgmdRFk0ANcwvIdOduVqOK0lVVgIx12K8a43M8nsnP1CpRSruVqvr4pVQ5ubudsrdJyTyDGVDmYzvCv30RkeNGA5NY+LSYBDvaupjPuAnnXnC3yS/47WXNaF9Svc+tkjZQIDAQAB"3600
TXT"MS=ms68853664"3600
TXT"v=spf1 a mx ip4:194.95.94.38/32 ip4:194.95.94.52/32 ip4:194.95.94.53/32 ip4:88.99.168.195/32 ip4:168.119.115.77/32 ip4:168.119.109.233/32 " "ip4:141.20.1.158/32 ip4:141.20.1.159/32 ip4:141.20.1.160/32 ip4:141.20.1.157/32 ip4:194.95.94.80/32 ~all"3600
TXT"HARICA-FnTpv2wxqRwWsiD0VAe"3600
TXT"apple-domain-verification=fb16rLktKUKHuPx2"3600
TXT"zone-ownership-verification-3f74eafc0a548fb3ccbe3590f4e3813658b38188e4a87ecdcda4670c23df3935"3600

Checks

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