uni-regensburg.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 5 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-3.dfn.de, dns1.uni-regensburg.de, dns2.uni-regensburg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-3.dfn.de, dns1.uni-regensburg.de, dns2.uni-regensburg.de
NS in the zone
dns-3.dfn.de, dns1.uni-regensburg.de, dns2.uni-regensburg.de
NameserverAddressesNetwork (AS)Glue
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-
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
dns2.uni-regensburg.de194.94.152.2 2001:638:a05:186:153:1:4:dab3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.152.2 2001:638:a05:186:153:1:4:dab3

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-3.dfn.de, dns1.uni-regensburg.de, dns2.uni-regensburg.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: dns1.uni-regensburg.de, dns2.uni-regensburg.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): 6 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

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns1.uni-regensburg.de 194.94.152.1NOERROR, 11 ms, authoritativenoyes / yesrefusedMy name is Bind, James Bind
dns1.uni-regensburg.de 2001:638:a05:186:153:1:4:dab0NOERROR, 12 ms, authoritativenoyes / yesrefusedMy name is Bind, James Bind
dns2.uni-regensburg.de 194.94.152.2NOERROR, 8 ms, authoritativenoyes / yesrefusedMy name is Bind, James Bind
dns2.uni-regensburg.de 2001:638:a05:186:153:1:4:dab3NOERROR, 11 ms, authoritativenoyes / yesrefusedMy name is Bind, James Bind

Checks

  • ✓ All respond #14
    All 6 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: dns-3.dfn.de: "0"; dns1.uni-regensburg.de: "My name is Bind, James Bind"; dns2.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 1792620036 · primary dns1.uni-regensburg.de

Found

Primary (MNAME)
dns1.uni-regensburg.de
Contact (RNAME)
hostmaster.uni-regensburg.de
Serial
1792620036
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns-3.dfn.de (193.174.75.58)1792620036
dns-3.dfn.de (2001:638:d:b103::1)1792620036
dns1.uni-regensburg.de (194.94.152.1)1792620036
dns1.uni-regensburg.de (2001:638:a05:186:153:1:4:dab0)1792620036
dns2.uni-regensburg.de (194.94.152.2)1792620036
dns2.uni-regensburg.de (2001:638:a05:186:153:1:4:dab3)1792620036

Checks

  • ✓ Serial 1792620036 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.uni-regensburg.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uni-regensburg.de #25
    The SOA RNAME hostmaster.uni-regensburg.de means hostmaster@uni-regensburg.de.
  • ✓ Timestamp serial #26
    The serial 1792620036 is a Unix timestamp (2026-10-21 22:00 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
10 iterations, 8-byte salt
Signatures valid until
30 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
32815RSASHA256 (8)SHA256 210F07CFCC9D8BFD…yes
38089RSASHA256 (8)SHA256 7BEAC1DE4D4C6A7B…yes

DNSKEY in the zone

Key tagRoleAlgorithm
38089KSK (257)RSASHA256 (8)
14553ZSK (256)RSASHA256 (8)
32815KSK (257)RSASHA256 (8)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 32815 (SHA256), key tag 38089 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-10-30 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-30 13:17 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Records

pass

12 records at the apex

Found

Read from
193.174.75.58:53
TypeValueTTL
SOAdns1.uni-regensburg.de. hostmaster.uni-regensburg.de. 1792620036 14400 3600 604800 36003600
NSdns-3.dfn.de.3600
NSdns2.uni-regensburg.de.3600
NSdns1.uni-regensburg.de.3600
A194.94.156.129360
MX30 b2561.mx.srv.dfn.de.3600
MX30 c2561.mx.srv.dfn.de.3600
MX30 a2561.mx.srv.dfn.de.3600
TXT"v=spf1 include:_spf.o256.mx.srv.dfn.de ip4:194.94.157.128/28 ip4:194.94.157.144/28 ip4:194.94.155.48/28 ip4:194.94.155.224/28 ip4:193.174.97.18 ip6:2001:4ca0:10b:6::c1ae:6112 -all"3600
CAA0 issue "harica.gr"3600
CAA0 issue "telesec.de"3600
CAA0 issuewild "harica.gr"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 6m, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: harica.gr, telesec.de.