deutsche-biographie.de

Checked 21 October 2026, 22:13 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 4 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.lrz.de, dns2.lrz.de, dns3.lrz.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.lrz.de, dns2.lrz.de, dns3.lrz.de
NS in the zone
dns1.lrz.de, dns2.lrz.de, dns3.lrz.de
NameserverAddressesNetwork (AS)Glue
dns1.lrz.de129.187.19.183 2001:4ca0:0:100:0:53:1:1AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE129.187.19.183 2001:4ca0:0:100:0:53:1:1
dns2.lrz.de141.40.9.211 2001:4ca0:0:100:0:53:1:2AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE-
dns3.lrz.de78.128.211.180 2001:718:1:1f:50:56ff:feee:180AS2852 CESNET2 - CESNET z.s.p.o., CZ AS2852 CESNET2 - CESNET z.s.p.o., CZ-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.lrz.de, dns2.lrz.de, dns3.lrz.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12816 (MWN-AS - Leibniz-Rechenzentrum, DE): 4 addresses; AS2852 (CESNET2 - CESNET z.s.p.o., CZ): 2 addresses.
  • 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

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.lrz.de 129.187.19.183NOERROR, 12 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
dns1.lrz.de 2001:4ca0:0:100:0:53:1:1NOERROR, 12 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
dns2.lrz.de 141.40.9.211NOERROR, 12 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
dns2.lrz.de 2001:4ca0:0:100:0:53:1:2NOERROR, 12 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
dns3.lrz.de 78.128.211.180NOERROR, 8 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
dns3.lrz.de 2001:718:1:1f:50:56ff:feee:180NOERROR, 8 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: dns1.lrz.de: "9.20.29-1~deb13u1-Debian"; dns2.lrz.de: "9.20.29-1~deb13u1-Debian"; dns3.lrz.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 2026100712 · primary dns1.lrz.de

Found

Primary (MNAME)
dns1.lrz.de
Contact (RNAME)
hostmaster.lrz.de
Serial
2026100712
Refresh / retry
10800 s / 3600 s
Expire
1814400 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.lrz.de (129.187.19.183)2026100712
dns1.lrz.de (2001:4ca0:0:100:0:53:1:1)2026100712
dns2.lrz.de (141.40.9.211)2026100712
dns2.lrz.de (2001:4ca0:0:100:0:53:1:2)2026100712
dns3.lrz.de (78.128.211.180)2026100712
dns3.lrz.de (2001:718:1:1f:50:56ff:feee:180)2026100712

Checks

  • ✓ Serial 2026100712 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 21d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.lrz.de is one of the listed nameservers.
  • ✓ Contact hostmaster@lrz.de #25
    The SOA RNAME hostmaster.lrz.de means hostmaster@lrz.de.
  • ✓ Date-based serial #26
    The serial 2026100712 follows the YYYYMMDDnn convention (2026-10-07).

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
129.187.19.183:53
TypeValueTTL
SOAdns1.lrz.de. hostmaster.lrz.de. 2026100712 10800 3600 1814400 8640086400
NSdns1.lrz.de.86400
NSdns3.lrz.de.86400
NSdns2.lrz.de.86400
A138.246.102.2286400
MX10 smtp.bsb-muenchen.de.86400
TXT"HARICA-7LURyMf12EEBPbnWE0G"86400

Checks

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