Domain report: marburger-bund.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

ns.dotplex.net, ns2.dotplex.de, ns3.dotplex.ie

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: ns.dotplex.net, ns2.dotplex.de, ns3.dotplex.ie
NS in the zone: ns.dotplex.net, ns2.dotplex.de, ns3.dotplex.ie

Nameserver	Addresses	Network (AS)	Glue
ns.dotplex.net	185.231.124.53 2a0c:5f00:1:135::	AS20647 IPB - IPB Internet Provider in Berlin GmbH, DE AS20647 IPB - IPB Internet Provider in Berlin GmbH, DE	-
ns2.dotplex.de	82.165.42.81 2a01:239:0:89::1	AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE	82.165.42.81 2a01:239:0:89::1
ns3.dotplex.ie	116.202.81.237 2a01:4f8:231:398f:3::	AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE	-

Checks

✓ 3 nameservers #6

Delegated to ns.dotplex.net, ns2.dotplex.de, ns3.dotplex.ie.
✓ 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 3 IPv6 /48s.
✓ 3 autonomous systems #11

The nameservers are spread over: AS20647 (IPB - IPB Internet Provider in Berlin GmbH, DE): 2 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 2 addresses; AS8560 (IONOS-AS - IONOS SE, DE): 2 addresses.
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .de, .ie, .net.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns.dotplex.net 185.231.124.53	NOERROR, 12 ms, authoritative	no	yes / yes	refused	your guess
ns.dotplex.net 2a0c:5f00:1:135::	NOERROR, 12 ms, authoritative	no	yes / yes	refused	your guess
ns2.dotplex.de 82.165.42.81	NOERROR, 14 ms, authoritative	no	yes / yes	refused	your guess
ns2.dotplex.de 2a01:239:0:89::1	NOERROR, 13 ms, authoritative	no	yes / yes	refused	your guess
ns3.dotplex.ie 116.202.81.237	NOERROR, 5 ms, authoritative	no	yes / yes	refused	your guess
ns3.dotplex.ie 2a01:4f8:231:398f:3::	NOERROR, 5 ms, authoritative	no	yes / yes	refused	your guess

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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns.dotplex.net: "your guess"; ns2.dotplex.de: "your guess"; ns3.dotplex.ie: "your guess".

#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 2026102101 · primary ns.dotplex.net

Found

Primary (MNAME): ns.dotplex.net
Contact (RNAME): support.dotplex.com
Serial: 2026102101
Refresh / retry: 86400 s / 10800 s
Expire: 1209600 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns.dotplex.net (185.231.124.53)	2026102101
ns.dotplex.net (2a0c:5f00:1:135::)	2026102101
ns2.dotplex.de (82.165.42.81)	2026102101
ns2.dotplex.de (2a01:239:0:89::1)	2026102101
ns3.dotplex.ie (116.202.81.237)	2026102101
ns3.dotplex.ie (2a01:4f8:231:398f:3::)	2026102101

Checks

✓ Serial 2026102101 everywhere #22

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

SOA refresh 1d, retry 3h, expire 14d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver ns.dotplex.net is one of the listed nameservers.
✓ Contact support@dotplex.com #25

The SOA RNAME support.dotplex.com means support@dotplex.com.
✓ Date-based serial #26

The serial 2026102101 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 17 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
51526	ECDSAP256SHA256 (13)	SHA256 B5B9D0C2F47DA2A4…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
51236	ZSK (256)	ECDSAP256SHA256 (13)
45940	ZSK (256)	ECDSAP256SHA256 (13)
51526	KSK (257)	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 51526 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-17 #30

The earliest DNSKEY/SOA signature expires at 2026-11-17 23:33 UTC.
✓ NSEC3 as recommended #31

The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

11 records at the apex

Found

Read from: 185.231.124.53:53

Type	Value	TTL
SOA	ns.dotplex.net. support.dotplex.com. 2026102101 86400 10800 1209600 3600	3600
NS	ns3.dotplex.ie.	3600
NS	ns.dotplex.net.	3600
NS	ns2.dotplex.de.	3600
A	185.231.124.212	3600
AAAA	2a0c:5f00:1:1d4::	3600
MX	10 mx.dotplex.com.	3600
TXT	"brevo-code:b0ad7535698ffcdeafcbbb3bd1caeef6"	3600
TXT	"v=spf1 ip4:213.187.93.134 ip6:2a02:238:f010:7:a405:16ff:fe16:6f96 include:_spf.dotplex.com include:spf.crsend.com -all"	3600
TXT	"apple-domain-verification=QFrwY8L463ytyhjD"	3600
TXT	"sophos-domain-verification=d75cedf766a05618235dbf45d732eedd2e34fdc27f4f9f3dcf394c3df60173f0"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 1h, MX 1h, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; 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.
i

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