Domain report: bib-bvb.de

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

pass

dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu
NS in the zone: dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu

Nameserver	Addresses	Network (AS)	Glue
dns1.lrz.de	129.187.19.183 2001:4ca0:0:100:0:53:1:1	AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE	129.187.19.183 2001:4ca0:0:100:0:53:1:1
dns2.lrz.bayern	141.40.9.211 2001:4ca0:0:100:0:53:1:2	AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE	-
dns3.lrz.eu	78.128.211.180 2001:718:1:1f:50:56ff:feee:180	AS2852 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.bayern, dns3.lrz.eu.
✓ 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.
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .bayern, .de, .eu.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

warn

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns1.lrz.de 129.187.19.183	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns1.lrz.de 2001:4ca0:0:100:0:53:1:1	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns2.lrz.bayern 141.40.9.211	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns2.lrz.bayern 2001:4ca0:0:100:0:53:1:2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns3.lrz.eu 78.128.211.180	NOERROR, 8 ms, authoritative	no	yes / yes	refused	9.18.49-1~deb12u2-Debian
dns3.lrz.eu 2001:718:1:1f:50:56ff:feee:180	NOERROR, 8 ms, authoritative	no	yes / yes	refused	9.18.49-1~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.bayern: "9.20.29-1~deb13u1-Debian"; dns3.lrz.eu: "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 2026102011 · primary dns1.lrz.de

Found

Primary (MNAME): dns1.lrz.de
Contact (RNAME): hostmaster.lrz.de
Serial: 2026102011
Refresh / retry: 10800 s / 3600 s
Expire: 1814400 s
Negative TTL: 300 s

Serial per nameserver

Nameserver	Serial
dns1.lrz.de (129.187.19.183)	2026102011
dns1.lrz.de (2001:4ca0:0:100:0:53:1:1)	2026102011
dns2.lrz.bayern (141.40.9.211)	2026102011
dns2.lrz.bayern (2001:4ca0:0:100:0:53:1:2)	2026102011
dns3.lrz.eu (78.128.211.180)	2026102011
dns3.lrz.eu (2001:718:1:1f:50:56ff:feee:180)	2026102011

Checks

✓ Serial 2026102011 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 3h, retry 1h, expire 21d, negative TTL 5m.
✓ 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 2026102011 follows the YYYYMMDDnn convention (2026-10-20).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 15 December 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
31231	RSASHA256 (8)	SHA256 76D906033C214643…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
31231	KSK (257)	RSASHA256 (8)
64674	ZSK (256)	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 31231 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-12-15 #30

The earliest DNSKEY/SOA signature expires at 2026-12-15 13:22 UTC.
i

NSEC

The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.

#31

Records

pass

13 records at the apex

Found

Read from: 129.187.19.183:53

Type	Value	TTL
SOA	dns1.lrz.de. hostmaster.lrz.de. 2026102011 10800 3600 1814400 300	86400
NS	dns3.lrz.eu.	7200
NS	dns2.lrz.bayern.	7200
NS	dns1.lrz.de.	7200
MX	10 postrelay1.lrz.de.	3600
MX	10 postrelay2.lrz.de.	3600
TXT	"v=spf1 a:bvbvxmail.bib-bvb.de redirect=_spf.mail.lrz.de"	86400
TXT	"HARICA-jq7LThfYH4YOF3WGgwp"	86400
TXT	"HARICA-iRqR9yMWPS0GGmBbfFz"	86400
CAA	0 issue "harica.gr"	7200
CAA	0 issue "sectigo.com"	7200
CAA	0 issue "pki.dfn.de"	7200
CAA	0 issue "letsencrypt.org"	7200

Checks

✓ TTLs within range #32

TTLs: MX 1h, NS 2h. The NS TTL at the parent is 1d and in the zone 2h; 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, sectigo.com, pki.dfn.de, letsencrypt.org.