Domain report: degruyter.de

Registration

info

.de country-code

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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

warn

ns1.cbxnet.de, ns3.cbxnet.de

Nameserver	Addresses	Network (AS)	Glue
ns1.cbxnet.de	212.87.33.1	AS12512 CBXNET - CBXNET combox internet GmbH, DE	212.87.33.1
ns3.cbxnet.de	213.191.33.253	AS12512 CBXNET - CBXNET combox internet GmbH, DE	213.191.33.253

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2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.cbxnet.de, ns3.cbxnet.de.

#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 2 IPv4 /24s and 0 IPv6 /48s.
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All nameservers in one AS

All nameserver addresses are announced by one network operator (AS12512 (CBXNET - CBXNET combox internet GmbH, DE): 2 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
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

info

2 of 2 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.cbxnet.de 212.87.33.1	NOERROR, 13 ms, authoritative	no	yes / yes	refused	dont ask a lady for her age
ns3.cbxnet.de 213.191.33.253	NOERROR, 16 ms, authoritative	no	yes / yes	refused	dont ask a lady for her age

✓ All respond #14

All 2 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: ns1.cbxnet.de: "dont ask a lady for her age"; ns3.cbxnet.de: "dont ask a lady for her age".

#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.

info

serial 2025040306 · primary ns.combox.de

Nameserver	Serial
ns1.cbxnet.de (212.87.33.1)	2025040306
ns3.cbxnet.de (213.191.33.253)	2025040306

✓ Serial 2025040306 everywhere #22

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

SOA refresh 8h, retry 2h, expire 7d, negative TTL 5m.
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Hidden master

The primary nameserver ns.combox.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

#24
✓ Contact postmaster@cbxnet.de #25

The SOA RNAME postmaster.cbxnet.de means postmaster@cbxnet.de.
✓ Date-based serial #26

The serial 2025040306 follows the YYYYMMDDnn convention (2025-04-03).

warn

Not signed

warn

8 records at the apex

Type	Value	TTL
SOA	ns.combox.de. postmaster.cbxnet.de. 2025040306 28800 7200 604800 300	300
NS	ns1.cbxnet.de.	300
NS	ns3.cbxnet.de.	300
A	3.77.18.232	60
A	18.193.53.189	60
A	3.123.197.222	60
MX	190 mail2.cbxnet.de.	300
MX	180 mail1.cbxnet.de.	300