hsu-hh.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 warnings 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

auth-dns-1.unibw-hamburg.de, auth-dns-2.unibw-hamburg.de, auth-dns-3.unibw-hamburg.de, dns-3.dfn.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
auth-dns-1.unibw-hamburg.de, auth-dns-2.unibw-hamburg.de, auth-dns-3.unibw-hamburg.de, dns-3.dfn.de
NS in the zone
auth-dns-1.unibw-hamburg.de, auth-dns-2.unibw-hamburg.de, auth-dns-3.unibw-hamburg.de, dns-3.dfn.de
NameserverAddressesNetwork (AS)Glue
auth-dns-1.unibw-hamburg.de139.11.5.11AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE139.11.5.11
auth-dns-2.unibw-hamburg.de139.11.5.12AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE139.11.5.12
auth-dns-3.unibw-hamburg.de139.11.5.13AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE139.11.5.13
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 auth-dns-1.unibw-hamburg.de, auth-dns-2.unibw-hamburg.de, auth-dns-3.unibw-hamburg.de, dns-3.dfn.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ 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 2 IPv4 /24s and 1 IPv6 /48.
  • 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): 5 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: auth-dns-1.unibw-hamburg.de, auth-dns-2.unibw-hamburg.de, auth-dns-3.unibw-hamburg.de.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
auth-dns-1.unibw-hamburg.de 139.11.5.11NOERROR, 12 ms, authoritativenoyes / yesrefusedHSU-DNS-5.73958
auth-dns-2.unibw-hamburg.de 139.11.5.12NOERROR, 12 ms, authoritativenoyes / yesrefusedHSU-DNS-5.73958
auth-dns-3.unibw-hamburg.de 139.11.5.13NOERROR, 12 ms, authoritativenoyes / yesrefusedHSU-DNS-5.73958
dns-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0

Checks

  • ✓ All respond #14
    All 5 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: auth-dns-1.unibw-hamburg.de: "HSU-DNS-5.73958"; auth-dns-2.unibw-hamburg.de: "HSU-DNS-5.73958"; auth-dns-3.unibw-hamburg.de: "HSU-DNS-5.73958". Hide or replace the version string.
    #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 2024053931 · primary auth-dns-1.unibw-hamburg.de

Found

Primary (MNAME)
auth-dns-1.unibw-hamburg.de
Contact (RNAME)
hostadm.hsu-hh.de
Serial
2024053931
Refresh / retry
300 s / 900 s
Expire
1048576 s
Negative TTL
2560 s

Serial per nameserver

NameserverSerial
auth-dns-1.unibw-hamburg.de (139.11.5.11)2024053931
auth-dns-2.unibw-hamburg.de (139.11.5.12)2024053931
auth-dns-3.unibw-hamburg.de (139.11.5.13)2024053931
dns-3.dfn.de (193.174.75.58)2024053931
dns-3.dfn.de (2001:638:d:b103::1)2024053931

Checks

  • ✓ Serial 2024053931 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 5m is outside 20m–1d; retry 15m should be shorter than refresh 5m. Current values: refresh 5m, retry 15m, expire 291h16m16s, negative TTL 42m40s.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver auth-dns-1.unibw-hamburg.de is one of the listed nameservers.
  • ✓ Contact hostadm@hsu-hh.de #25
    The SOA RNAME hostadm.hsu-hh.de means hostadm@hsu-hh.de.
  • ✓ Timestamp serial #26
    The serial 2024053931 is a Unix timestamp (2034-02-20 13:12 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

pass

26 records at the apex

Found

Read from
139.11.5.11:53
TypeValueTTL
SOAauth-dns-1.unibw-hamburg.de. hostadm.hsu-hh.de. 2024053931 300 900 1048576 25602560
NSdns-3.dfn.de.2560
NSauth-dns-3.unibw-hamburg.de.2560
NSauth-dns-2.unibw-hamburg.de.2560
NSauth-dns-1.unibw-hamburg.de.2560
A139.11.5.52300
MX20 premail.unibw-hamburg.de.3600
TXT"atlassian-domain-verification=t0AfXmj4jbFFX8yehWnpGyEkWsB/nGqny4icqYM4MV/gWR875g3/2gDkJhCsPi1Y"86400
TXT"v=spf1 ip4:139.11.5.0/24 ip4:139.11.10.0/24 ip4:139.11.80.0/22 ip4:139.11.40.0/24 ip4:193.174.240.0/24 include:spf.protection.outlook.com -all"86400
TXT"adobe-idp-site-verification=9051ee60192c39cd0e2df954a124b2fdda47260eed95ab0f4917d4d616c1a1b6"86400
TXT"apple-domain-verification=XUFCwQRLvXzcJKNI"86400
TXT"google-site-verification=rh4bbjDpSeFNY07uD-uDqe0IBRDFftpzp1UzjTGb8dQ"86400
TXT"google-site-verification=Cq9t5VLBb5lOva2sJuYFG5PymCwblEnU6qmZdDsmWJs"86400
TXT"MS=ms69867668"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issue "pki.goog"86400
CAA0 issuewild "pki.dfn.de"86400
CAA0 issuewild "harica.gr"86400
CAA0 issue "letsencrypt.org"86400
CAA0 issue "digicert.com"86400
CAA0 issue "sectigo.com"86400
CAA0 issuewild "pki.goog"86400
CAA0 issuewild "digicert.com"86400
CAA0 issuewild "sectigo.com"86400
CAA0 issuewild "letsencrypt.org"86400
CAA0 issue "harica.gr"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1h, NS 42m40s. The NS TTL at the parent is 1d and in the zone 42m40s; 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: pki.dfn.de, pki.goog, harica.gr, letsencrypt.org, digicert.com, sectigo.com.