Domain report: kobv.de

Registration

info

.de country-code

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

info

dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns1.zib.de, ns2.zib.de

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns1.zib.de, ns2.zib.de
NS in the zone: dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns1.zib.de, ns2.zib.de

Nameserver	Addresses	Network (AS)	Glue
dns-1.dfn.de	193.174.75.50 2001:638:d:b101::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
dns-2.dfn.de	193.174.75.54 2001:638:d:b102::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
dns-3.dfn.de	193.174.75.58 2001:638:d:b103::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
ns1.zib.de	130.73.108.108	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	130.73.108.108
ns2.zib.de	130.73.108.109	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	130.73.108.109

✓ 5 nameservers #6

Delegated to dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns1.zib.de, ns2.zib.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.
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One address family in one network

all IPv6 addresses are in 2001:638:d::/48, while the other address family is spread over several networks.

#10
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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): 8 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 .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
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Partly IPv6

These nameservers have no IPv6 address: ns1.zib.de, ns2.zib.de.

#13

info

8 of 8 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns-1.dfn.de 193.174.75.50	NOERROR, 14 ms, authoritative	no	yes / yes	refused	0
dns-1.dfn.de 2001:638:d:b101::1	NOERROR, 14 ms, authoritative	no	yes / yes	refused	0
dns-2.dfn.de 193.174.75.54	NOERROR, 7 ms, authoritative	no	yes / yes	refused	0
dns-2.dfn.de 2001:638:d:b102::1	NOERROR, 7 ms, authoritative	no	yes / yes	refused	0
dns-3.dfn.de 193.174.75.58	NOERROR, 8 ms, authoritative	no	yes / yes	refused	0
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 8 ms, authoritative	no	yes / yes	refused	0
ns1.zib.de 130.73.108.108	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
ns2.zib.de 130.73.108.109	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-

✓ All respond #14

All 8 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.
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Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: dns-1.dfn.de: "0"; dns-2.dfn.de: "0"; dns-3.dfn.de: "0".

#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.

pass

serial 2026101201 · primary ns1.zib.de

✓ Serial 2026101201 everywhere #22

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

SOA refresh 12h, retry 1h, expire 1000h, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver ns1.zib.de is one of the listed nameservers.
✓ Contact hostmaster@zib.de #25

The SOA RNAME hostmaster.zib.de means hostmaster@zib.de.
✓ Date-based serial #26

The serial 2026101201 follows the YYYYMMDDnn convention (2026-10-12).

warn

Not signed

info

14 records at the apex

Type	Value	TTL
SOA	ns1.zib.de. hostmaster.zib.de. 2026101201 43200 3600 3600000 86400	86400
NS	ns2.zib.de.	86400
NS	ns1.zib.de.	86400
NS	dns-3.dfn.de.	86400
NS	dns-2.dfn.de.	86400
NS	dns-1.dfn.de.	86400
A	130.73.102.120	86400
MX	20 mailer04.zib.de.	86400
MX	20 mailer03.zib.de.	86400
MX	20 mailer01-a.zib.de.	86400
MX	20 mailer01.zib.de.	86400
MX	20 mailer01-b.zib.de.	86400
TXT	"site24x7-signals-domain-verification=297e2f0fd9ef1a489b61f7a8f0414fb4"	86400
TXT	"HARICA-48D4y8lJ11EqBFuj5ur"	86400