Domain report: rptu.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

ns1.rptu.de, ns2.rptu.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: ns1.rptu.de, ns2.rptu.de
NS in the zone: ns1.rptu.de, ns2.rptu.de

Nameserver	Addresses	Network (AS)	Glue
ns1.rptu.de	131.246.9.117 2a03:63c0::53:1001	AS199578 UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE AS199578 UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE	131.246.9.117 2a03:63c0::53:1001
ns2.rptu.de	131.246.1.117 2a03:63c0::53:1002	AS199578 UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE AS199578 UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE	131.246.1.117 2a03:63c0::53:1002

Checks

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2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.rptu.de, ns2.rptu.de.

#6
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ Glue present and correct #8

Glue is published for the nameservers inside the zone: ns1.rptu.de, ns2.rptu.de.
✓ 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 2a03:63c0::/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 (AS199578 (UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE): 4 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
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.rptu.de 131.246.9.117	NOERROR, 8 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
ns1.rptu.de 2a03:63c0::53:1001	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
ns2.rptu.de 131.246.1.117	NOERROR, 7 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
ns2.rptu.de 2a03:63c0::53:1002	NOERROR, 8 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian

Checks

✓ All respond #14

All 4 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: ns1.rptu.de: "9.20.29-1~deb13u1-Debian"; ns2.rptu.de: "9.20.29-1~deb13u1-Debian". 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 2026104854 · primary ns1.rptu.de

Found

Primary (MNAME): ns1.rptu.de
Contact (RNAME): hostmaster.uni-kl.de
Serial: 2026104854
Refresh / retry: 28800 s / 7200 s
Expire: 1814400 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns1.rptu.de (131.246.9.117)	2026104854
ns1.rptu.de (2a03:63c0::53:1001)	2026104854
ns2.rptu.de (131.246.1.117)	2026104854
ns2.rptu.de (2a03:63c0::53:1002)	2026104854

Checks

✓ Serial 2026104854 everywhere #22

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

SOA refresh 8h, retry 2h, expire 21d, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver ns1.rptu.de is one of the listed nameservers.
✓ Contact hostmaster@uni-kl.de #25

The SOA RNAME hostmaster.uni-kl.de means hostmaster@uni-kl.de.
✓ Timestamp serial #26

The serial 2026104854 is a Unix timestamp (2034-03-16 06:54 UTC).

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: 30 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
8399	ECDSAP256SHA256 (13)	SHA256 983D4E9BFF85382B…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
8399	KSK (257)	ECDSAP256SHA256 (13)
40391	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 8399 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-10-30 #30

The earliest DNSKEY/SOA signature expires at 2026-10-30 08:02 UTC.
✓ NSEC3 as recommended #31

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

Records

info

13 records at the apex

Found

Read from: 131.246.9.117:53

Type	Value	TTL
SOA	ns1.rptu.de. hostmaster.uni-kl.de. 2026104854 28800 7200 1814400 86400	86400
NS	ns2.rptu.de.	86400
NS	ns1.rptu.de.	86400
A	131.246.120.130	300
AAAA	2001:638:208:ef61:0:ff:fe00:2	300
MX	10 mailgate1.uni-kl.de.	86400
MX	5 mailgate2.uni-kl.de.	86400
TXT	"adobe-idp-site-verification=c85d99887bd10b6cd30a2bfbc8a8c8e4179cccae8334f58df9e00182dba93768"	86400
TXT	"HARICA-THzUXzBVxpOF4q8MKqa"	86400
TXT	"apple-domain-verification=H9amvcoJ1uvOGVV2"	86400
TXT	"MS=ms80130972"	86400
TXT	"v=spf1 redirect=_spf.uni-kl.de"	86400
TXT	"google-site-verification=mpHvITSTxefyYZ-glK8inKRCeuGfJrjl_HTHn9_Lwfc"	86400

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 1d, NS 1d.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
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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