Domain report: bibliotheca-open.de

Registration

info

.de country-code

Found

TLD: .de (country-code)
ICANN policies apply: no

Checks

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.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.
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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

michelle.ns.cloudflare.com, nico.ns.cloudflare.com

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: michelle.ns.cloudflare.com, nico.ns.cloudflare.com
NS in the zone: michelle.ns.cloudflare.com, nico.ns.cloudflare.com

Nameserver	Addresses	Network (AS)	Glue
michelle.ns.cloudflare.com	108.162.192.201 173.245.58.201 172.64.32.201 2a06:98c1:50::ac40:20c9 2606:4700:50::adf5:3ac9 2803:f800:50::6ca2:c0c9	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-
nico.ns.cloudflare.com	162.159.44.147 172.64.35.147 108.162.195.147 2803:f800:50::6ca2:c393 2606:4700:58::a29f:2c93 2a06:98c1:50::ac40:2393	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-

Checks

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2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: michelle.ns.cloudflare.com, nico.ns.cloudflare.com.

#6
✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
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All nameservers in one AS

All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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All nameserver names under .com

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

12 of 12 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
michelle.ns.cloudflare.com 108.162.192.201	NOERROR, 14 ms, authoritative	no	yes / yes	refused	2026.10.2
michelle.ns.cloudflare.com 173.245.58.201	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
michelle.ns.cloudflare.com 172.64.32.201	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
michelle.ns.cloudflare.com 2a06:98c1:50::ac40:20c9	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
michelle.ns.cloudflare.com 2606:4700:50::adf5:3ac9	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
michelle.ns.cloudflare.com 2803:f800:50::6ca2:c0c9	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
nico.ns.cloudflare.com 162.159.44.147	NOERROR, 33 ms, authoritative	no	yes / yes	refused	2026.10.2
nico.ns.cloudflare.com 172.64.35.147	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
nico.ns.cloudflare.com 108.162.195.147	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
nico.ns.cloudflare.com 2803:f800:50::6ca2:c393	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
nico.ns.cloudflare.com 2606:4700:58::a29f:2c93	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
nico.ns.cloudflare.com 2a06:98c1:50::ac40:2393	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2

Checks

✓ All respond #14

All 12 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: michelle.ns.cloudflare.com: "2026.10.2"; nico.ns.cloudflare.com: "2026.10.2". 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 2417528592 · primary michelle.ns.cloudflare.com

Found

Primary (MNAME): michelle.ns.cloudflare.com
Contact (RNAME): dns.cloudflare.com
Serial: 2417528592
Refresh / retry: 10000 s / 2400 s
Expire: 604800 s
Negative TTL: 1800 s

Serial per nameserver

Nameserver	Serial
michelle.ns.cloudflare.com (108.162.192.201)	2417528592
michelle.ns.cloudflare.com (173.245.58.201)	2417528592
michelle.ns.cloudflare.com (172.64.32.201)	2417528592
michelle.ns.cloudflare.com (2a06:98c1:50::ac40:20c9)	2417528592
michelle.ns.cloudflare.com (2606:4700:50::adf5:3ac9)	2417528592
michelle.ns.cloudflare.com (2803:f800:50::6ca2:c0c9)	2417528592
nico.ns.cloudflare.com (162.159.44.147)	2417528592
nico.ns.cloudflare.com (172.64.35.147)	2417528592
nico.ns.cloudflare.com (108.162.195.147)	2417528592
nico.ns.cloudflare.com (2803:f800:50::6ca2:c393)	2417528592
nico.ns.cloudflare.com (2606:4700:58::a29f:2c93)	2417528592
nico.ns.cloudflare.com (2a06:98c1:50::ac40:2393)	2417528592

Checks

✓ Serial 2417528592 everywhere #22

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

SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
✓ Primary is a public nameserver #24

The primary nameserver michelle.ns.cloudflare.com is one of the listed nameservers.
✓ Contact dns@cloudflare.com #25

The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
✓ Timestamp serial #26

The serial 2417528592 is a Unix timestamp (2046-08-10 15:43 UTC).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
Signatures valid until: 22 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
2371	ECDSAP256SHA256 (13)	SHA256 67AC31A24FDAEB96…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
2371	KSK (257)	ECDSAP256SHA256 (13)
34505	ZSK (256)	ECDSAP256SHA256 (13)

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 2371 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-20 20:40 UTC and expires at 2026-10-22 22:40 UTC.

Records

info

4 records at the apex

Found

Read from: 108.162.192.201:53

Type	Value	TTL
SOA	michelle.ns.cloudflare.com. dns.cloudflare.com. 2417528592 10000 2400 604800 1800	1800
NS	michelle.ns.cloudflare.com.	86400
NS	nico.ns.cloudflare.com.	86400
TXT	"_4jcgohkdx2ouvv1lg3szcppa2eaa5w6"	300

Checks

✓ TTLs within range #32

TTLs: NS 1d.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
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Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
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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