Domain report: arminia-bielefeld.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.
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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

warn

linbicos.bicos.de, ns2.bicos.de, ns4.bicos.de

Nameserver	Addresses	Network (AS)	Glue
linbicos.bicos.de (parent only)	212.100.32.1 2a00:d58::1 2a00:d58::212:100:32:1	AS12466 BICOS - Bicos Computer GmbH, DE AS12466 BICOS - Bicos Computer GmbH, DE AS12466 BICOS - Bicos Computer GmbH, DE	212.100.32.1 2a00:d58::1 2a00:d58::212:100:32:1
ns1.bicos.de (zone only)	212.100.32.1 2a00:d58::212:100:32:1	AS12466 BICOS - Bicos Computer GmbH, DE AS12466 BICOS - Bicos Computer GmbH, DE	-
ns2.bicos.de	193.24.2.221	AS12466 BICOS - Bicos Computer GmbH, DE	-
ns4.bicos.de	195.4.173.228	AS60175 WAG - Wortmann AG, DE	195.4.173.228

✓ 3 nameservers #6

Delegated to linbicos.bicos.de, ns2.bicos.de, ns4.bicos.de.
!

NS sets differ

The nameservers at the parent and in the zone should be the same. Only at the parent: linbicos.bicos.de; only in the zone: ns1.bicos.de. linbicos.bicos.de, ns1.bicos.de, ns2.bicos.de, ns4.bicos.de report NS ns1.bicos.de ns2.bicos.de ns4.bicos.de.

#7
✓ 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 2a00:d58::/48, while the other address family is spread over several networks.

#10
✓ 2 autonomous systems #11

The nameservers are spread over: AS12466 (BICOS - Bicos Computer GmbH, DE): 6 addresses; AS60175 (WAG - Wortmann AG, DE): 1 address.
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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: ns2.bicos.de, ns4.bicos.de.

#13

info

7 of 7 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
linbicos.bicos.de 212.100.32.1	NOERROR, 13 ms, authoritative	no	yes / yes	refused	Bind
linbicos.bicos.de 2a00:d58::1	NOERROR, 15 ms, authoritative	no	yes / yes	refused	Bind
linbicos.bicos.de 2a00:d58::212:100:32:1	NOERROR, 15 ms, authoritative	no	yes / yes	refused	Bind
ns1.bicos.de 212.100.32.1	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Bind
ns1.bicos.de 2a00:d58::212:100:32:1	NOERROR, 12 ms, authoritative	no	yes / yes	refused	Bind
ns2.bicos.de 193.24.2.221	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Bind
ns4.bicos.de 195.4.173.228	NOERROR, 14 ms, authoritative	no	yes / yes	refused	Bind

✓ All respond #14

All 7 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: linbicos.bicos.de: "Bind"; ns1.bicos.de: "Bind"; ns2.bicos.de: "Bind"; ns4.bicos.de: "Bind".

#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.

warn

serial 2026071402 · primary linbicos.bicos.de

✓ Serial 2026071402 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 8h, retry 2h, expire 1h, negative TTL 1d.

#23
✓ Primary is a public nameserver #24

The primary nameserver linbicos.bicos.de is one of the listed nameservers.
✓ Contact root@linbicos.bicos.de #25

The SOA RNAME root.linbicos.bicos.de means root@linbicos.bicos.de.
✓ Date-based serial #26

The serial 2026071402 follows the YYYYMMDDnn convention (2026-07-14).

warn

Not signed

info

10 records at the apex

Type	Value	TTL
SOA	linbicos.bicos.de. root.linbicos.bicos.de. 2026071402 28800 7200 3600 86400	86400
NS	ns2.bicos.de.	86400
NS	ns4.bicos.de.	86400
NS	ns1.bicos.de.	86400
A	185.233.55.77	300
MX	30 mx03.hornetsecurity.com.	86400
MX	10 mx01.hornetsecurity.com.	86400
MX	20 mx02.hornetsecurity.com.	86400
MX	40 mx04.hornetsecurity.com.	86400
TXT	"v=spf1 a mx a:mx.arminia.de a:www.arminia-bielefeld.de a:www.arminia.de include:spf.protection.outlook.com include:spf.hornetsecurity.com -all"	86400