uk-erlangen.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 failed 7 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

dns1.uni-regensburg.de, ns1.uk-erlangen.de, ns3.uk-erlangen.de, ns3.uni-erlangen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.uni-regensburg.de, ns1.uk-erlangen.de, ns3.uk-erlangen.de, ns3.uni-erlangen.de
NS in the zone
dns1.uni-regensburg.de, ns1.uk-erlangen.de, ns3.uk-erlangen.de, ns3.uni-erlangen.de
NameserverAddressesNetwork (AS)Glue
dns1.uni-regensburg.de194.94.152.1 2001:638:a05:186:153:1:4:dab0AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.152.1 2001:638:a05:186:153:1:4:dab0
ns1.uk-erlangen.de141.67.253.171AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.67.253.171
ns3.uk-erlangen.de141.67.253.170AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.67.253.170
ns3.uni-erlangen.de131.188.3.4 131.188.0.52 2001:638:a000:1055:53::3 2001:638:a000:1001:53::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 dns1.uni-regensburg.de, ns1.uk-erlangen.de, ns3.uk-erlangen.de, ns3.uni-erlangen.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: ns1.uk-erlangen.de, ns3.uk-erlangen.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 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): 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.uk-erlangen.de, ns3.uk-erlangen.de.
    #13

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.uni-regensburg.de 194.94.152.1NOERROR, 8 ms, authoritativenoyes / yesrefusedMy name is Bind, James Bind
dns1.uni-regensburg.de 2001:638:a05:186:153:1:4:dab0NOERROR, 9 ms, authoritativenoyes / yesrefusedMy name is Bind, James Bind
ns1.uk-erlangen.de 141.67.253.171NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns3.uk-erlangen.de 141.67.253.170NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns3.uni-erlangen.de 131.188.3.4NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns3.uni-erlangen.de 131.188.0.52NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns3.uni-erlangen.de 2001:638:a000:1055:53::3NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns3.uni-erlangen.de 2001:638:a000:1001:53::3NOERROR, 8 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns1.uni-regensburg.de: "My name is Bind, James Bind".
    #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 2015269753 · primary ns1.uk-erlangen.de

Found

Primary (MNAME)
ns1.uk-erlangen.de
Contact (RNAME)
hostmaster.uk-erlangen.de
Serial
2015269753
Refresh / retry
10800 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns1.uni-regensburg.de (194.94.152.1)2015269753
dns1.uni-regensburg.de (2001:638:a05:186:153:1:4:dab0)2015269753
ns1.uk-erlangen.de (141.67.253.171)2015269753
ns3.uk-erlangen.de (141.67.253.170)2015269753
ns3.uni-erlangen.de (131.188.3.4)2015269753
ns3.uni-erlangen.de (131.188.0.52)2015269753
ns3.uni-erlangen.de (2001:638:a000:1055:53::3)2015269753
ns3.uni-erlangen.de (2001:638:a000:1001:53::3)2015269753

Checks

  • ✓ Serial 2015269753 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.uk-erlangen.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uk-erlangen.de #25
    The SOA RNAME hostmaster.uk-erlangen.de means hostmaster@uk-erlangen.de.
  • ✓ Timestamp serial #26
    The serial 2015269753 is a Unix timestamp (2033-11-10 21:09 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

13 records at the apex

Found

Read from
194.94.152.1:53
TypeValueTTL
SOAns1.uk-erlangen.de. hostmaster.uk-erlangen.de. 2015269753 10800 1800 1209600 36003600
NSns3.uni-erlangen.de.3600
NSns3.uk-erlangen.de.3600
NSdns1.uni-regensburg.de.3600
NSns1.uk-erlangen.de.3600
MX10 mx-18594099.mail.eu.retarus.com.86400
TXT"v=spf1 mx include:_spf.retarus.com include:spf.de.umantis.com include:spfhard.crsend.com ip4:131.188.11.0/26 ip6:2001:638:a000:1025::/64 -all"3600
TXT"adobe-idp-site-verification=3dd30382f273b526f34ebc7e1fefb7ab94464a1a0855ae4174db291dd3054060"3600
TXT"google-site-verification=Y_nU93g4-9fzwCh7QqKP5zpGNOUjpmWiz3tN7fWZA1c"3600
TXT"cisco-ci-domain-verification=741e1a287acdf6961337c8ea653476c291fe0319879e05dcf58018dbd5a9b1a0"3600
TXT"MS=D0C4FA6BF03251CD365841FABB6B0ECA43C1B493"3600
TXT"linkedin-site-verification=aa9f456e-9d32-416c-b311-e039ed25e845"3600
TXT"apple-domain-verification=Ywr3kZWO4qraFbuA"3600

Checks

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