staatsbibliothek-berlin.de

Checked 22 October 2026, 00:30 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 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

deneb.dfn.de, dns-2.dfn.de, ns.staatsbibliothek-berlin.de, ns1.staatsbibliothek-berlin.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns-2.dfn.de, ns.staatsbibliothek-berlin.de, ns1.staatsbibliothek-berlin.de
NS in the zone
deneb.dfn.de, dns-2.dfn.de, ns.staatsbibliothek-berlin.de, ns1.staatsbibliothek-berlin.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
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-
ns.staatsbibliothek-berlin.de194.94.133.253AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.133.253
ns1.staatsbibliothek-berlin.de194.94.133.13AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.133.13

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, dns-2.dfn.de, ns.staatsbibliothek-berlin.de, ns1.staatsbibliothek-berlin.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: ns.staatsbibliothek-berlin.de, ns1.staatsbibliothek-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 3 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns.staatsbibliothek-berlin.de, ns1.staatsbibliothek-berlin.de.
    #13

Nameservers

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 193.174.75.54NOERROR, 6 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 7 ms, authoritativenoyes / yesrefused0
ns.staatsbibliothek-berlin.de 194.94.133.253NOERROR, 14 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns1.staatsbibliothek-berlin.de 194.94.133.13NOERROR, 14 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian

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: ns.staatsbibliothek-berlin.de: "9.18.49-1~deb12u2-Debian"; ns1.staatsbibliothek-berlin.de: "9.18.49-1~deb12u2-Debian". 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

pass

serial 2026101401 · primary ns.staatsbibliothek-berlin.de

Found

Primary (MNAME)
ns.staatsbibliothek-berlin.de
Contact (RNAME)
ns-admin.sbb.spk-berlin.de
Serial
2026101401
Refresh / retry
86400 s / 7200 s
Expire
2419200 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026101401
deneb.dfn.de (2001:638:800:1::9)2026101401
dns-2.dfn.de (193.174.75.54)2026101401
dns-2.dfn.de (2001:638:d:b102::1)2026101401
ns.staatsbibliothek-berlin.de (194.94.133.253)2026101401
ns1.staatsbibliothek-berlin.de (194.94.133.13)2026101401

Checks

  • ✓ Serial 2026101401 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 28d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.staatsbibliothek-berlin.de is one of the listed nameservers.
  • ✓ Contact ns-admin@sbb.spk-berlin.de #25
    The SOA RNAME ns-admin.sbb.spk-berlin.de means ns-admin@sbb.spk-berlin.de.
  • ✓ Date-based serial #26
    The serial 2026101401 follows the YYYYMMDDnn convention (2026-10-14).

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

7 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAns.staatsbibliothek-berlin.de. ns-admin.sbb.spk-berlin.de. 2026101401 86400 7200 2419200 10800600
NSns.staatsbibliothek-berlin.de.600
NSdeneb.dfn.de.600
NSns1.staatsbibliothek-berlin.de.600
NSdns-2.dfn.de.600
A194.94.132.172600
TXT"v=spf1 ip4:194.94.132.80 ip4:194.94.132.106 -all"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 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