hfbk-hamburg.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
✗Problems found
20 passed 3 warnings 1 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

ns.hfbk-hamburg.de, ns2.hfbk-hamburg.de, p-dns.irz42.net, s-dns.irz42.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.hfbk-hamburg.de, ns2.hfbk-hamburg.de, p-dns.irz42.net, s-dns.irz42.net
NS in the zone
ns.hfbk-hamburg.de, ns2.hfbk-hamburg.de, p-dns.irz42.net, s-dns.irz42.net
NameserverAddressesNetwork (AS)Glue
ns.hfbk-hamburg.de193.174.241.206AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.174.241.206
ns2.hfbk-hamburg.de193.174.241.213AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.174.241.213
p-dns.irz42.net192.76.134.30 2a00:14b0:4200:8600::30AS13135 CREW-AS - Wieske_s Crew GmbH, DE AS13135 CREW-AS - Wieske_s Crew GmbH, DE-
s-dns.irz42.net212.12.50.130 2a00:14b0:4200:3280::130AS13135 CREW-AS - Wieske_s Crew GmbH, DE AS13135 CREW-AS - Wieske_s Crew GmbH, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns.hfbk-hamburg.de, ns2.hfbk-hamburg.de, p-dns.irz42.net, s-dns.irz42.net.
  • ✓ 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: ns.hfbk-hamburg.de, ns2.hfbk-hamburg.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2a00:14b0:4200::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS13135 (CREW-AS - Wieske_s Crew GmbH, DE): 4 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns.hfbk-hamburg.de, ns2.hfbk-hamburg.de.
    #13

Nameservers

fail

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.hfbk-hamburg.de 193.174.241.206NOERROR, 17 ms, authoritativenono / norefused-
ns2.hfbk-hamburg.de 193.174.241.213NOERROR, 17 ms, authoritativenono / norefused-
p-dns.irz42.net 192.76.134.30NOERROR, 12 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.4.1
p-dns.irz42.net 2a00:14b0:4200:8600::30NOERROR, 41 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.4.1
s-dns.irz42.net 212.12.50.130NOERROR, 12 ms, authoritativenoyes / yesrefusedToaster connected to coffee cup [tm]
s-dns.irz42.net 2a00:14b0:4200:3280::130NOERROR, 41 ms, authoritativenoyes / yesrefusedToaster connected to coffee cup [tm]

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: p-dns.irz42.net: "PowerDNS Authoritative Server 4.4.1". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns.hfbk-hamburg.de (193.174.241.206): dial tcp 193.174.241.206:53: connect: connection refused; ns2.hfbk-hamburg.de (193.174.241.213): dial tcp 193.174.241.213:53: connect: connection refused.
    #19
  • !
    No EDNS
    These nameservers don't support EDNS(0), needed for DNSSEC and answers larger than 512 bytes: ns.hfbk-hamburg.de (193.174.241.206), ns2.hfbk-hamburg.de (193.174.241.213).
    #20
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 1792144144 · primary ns.hfbk-hamburg.de

Found

Primary (MNAME)
ns.hfbk-hamburg.de
Contact (RNAME)
hostmaster.hfbk-hamburg.de
Serial
1792144144
Refresh / retry
16384 s / 2048 s
Expire
1048576 s
Negative TTL
2560 s

Serial per nameserver

NameserverSerial
ns.hfbk-hamburg.de (193.174.241.206)1792144144
ns2.hfbk-hamburg.de (193.174.241.213)1792144144
p-dns.irz42.net (192.76.134.30)1792144144
p-dns.irz42.net (2a00:14b0:4200:8600::30)1792144144
s-dns.irz42.net (212.12.50.130)1792144144
s-dns.irz42.net (2a00:14b0:4200:3280::130)1792144144

Checks

  • ✓ Serial 1792144144 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h33m4s, retry 34m8s, expire 291h16m16s, negative TTL 42m40s.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.hfbk-hamburg.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hfbk-hamburg.de #25
    The SOA RNAME hostmaster.hfbk-hamburg.de means hostmaster@hfbk-hamburg.de.
  • ✓ Timestamp serial #26
    The serial 1792144144 is a Unix timestamp (2026-10-16 09:49 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
193.174.241.206:53
TypeValueTTL
SOAns.hfbk-hamburg.de. hostmaster.hfbk-hamburg.de. 1792144144 16384 2048 1048576 25602560
NSns.hfbk-hamburg.de.604800
NSns2.hfbk-hamburg.de.604800
NSp-dns.irz42.net.604800
NSs-dns.irz42.net.604800
A157.90.130.1077200
MX5 mx.hfbk-hamburg.de.600
TXT"v=spf1 a:mail.hfbk.art a:ak47.hfbk-hamburg.de include:cemsc.net ~all"3600
TXT"MS=ms80089739"86400
TXT"adobe-idp-site-verification=719176fa8eb3626d5c4bbb2d300c22a1dbda4ee4de984b64960019af97448965"3600
TXT"apple-domain-verification=E9pZK0U36JT239AZ"3600
TXT"@MS=9963141B9DA859831057DB7B1395717494A44ABB"300
TXT"google-site-verification=7qqbM4602jmljn2eCyB2MhKIDRRFv0tjl6nnkEEOGks"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 2h, MX 10m, NS 7d. The NS TTL at the parent is 1d and in the zone 7d; 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