Domain report: ipk-gatersleben.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

warn

dns-2.dfn.de, dns-3.dfn.de, mendel.ipk-gatersleben.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns-2.dfn.de, dns-3.dfn.de, mendel.ipk-gatersleben.de
NS in the zone: dns-2.dfn.de, dns-3.dfn.de, mendel.ipk-gatersleben.de

Nameserver	Addresses	Network (AS)	Glue
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	-
mendel.ipk-gatersleben.de	194.94.136.1 2001:638:913:d360::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	194.94.136.1

Checks

✓ 3 nameservers #6

Delegated to dns-2.dfn.de, dns-3.dfn.de, mendel.ipk-gatersleben.de.
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
!

Glue differs from the zone

The addresses at the parent (glue) differ from the addresses in the zone: mendel.ipk-gatersleben.de (glue 194.94.136.1, zone 194.94.136.1, 2001:638:913:d360::1). Update the glue at your registrar.

#8
✓ 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 2 IPv6 /48s.
i

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): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
i

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

fail

5 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
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, 10 ms, authoritative	no	yes / yes	refused	0
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 10 ms, authoritative	no	yes / yes	refused	0
mendel.ipk-gatersleben.de 194.94.136.1	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-
mendel.ipk-gatersleben.de 2001:638:913:d360::1	no response	no	no / no	-	-

Checks

✗

Nameservers not responding

These addresses did not answer, so resolvers waste time on timeouts: mendel.ipk-gatersleben.de (2001:638:913:d360::1): read udp [2a01:4f8:1c1c:eebf::1]:43488->[2001:638:913:d360::1]:53: i/o timeout.

#14
✓ 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: 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.

SOA

warn

serial 1792623062 · primary mendel.ipk-gatersleben.de

Found

Primary (MNAME): mendel.ipk-gatersleben.de
Contact (RNAME): hostmaster.ipk-gatersleben.de
Serial: 1792623062
Refresh / retry: 86400 s / 7200 s
Expire: 3600000 s
Negative TTL: 172800 s

Serial per nameserver

Nameserver	Serial
dns-2.dfn.de (193.174.75.54)	1792623062
dns-2.dfn.de (2001:638:d:b102::1)	1792623062
dns-3.dfn.de (193.174.75.58)	1792623062
dns-3.dfn.de (2001:638:d:b103::1)	1792623062
mendel.ipk-gatersleben.de (194.94.136.1)	1792623062

Checks

✓ Serial 1792623062 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

negative caching TTL (minimum) 2d is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1d, retry 2h, expire 1000h, negative TTL 2d.

#23
✓ Primary is a public nameserver #24

The primary nameserver mendel.ipk-gatersleben.de is one of the listed nameservers.
✓ Contact hostmaster@ipk-gatersleben.de #25

The SOA RNAME hostmaster.ipk-gatersleben.de means hostmaster@ipk-gatersleben.de.
✓ Timestamp serial #26

The serial 1792623062 is a Unix timestamp (2026-10-21 22:51 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 27 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
9010	ECDSAP256SHA256 (13)	SHA256 719B8702FC9EE2F7…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
9010	KSK (257)	ECDSAP256SHA256 (13)
28010	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 9010 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
!

Signatures expire soon

The earliest signature expires at 2026-10-27 08:23 UTC (in 129h0m0s). Check that automatic re-signing works.

#30
✓ NSEC3 as recommended #31

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

Records

pass

17 records at the apex

Found

Read from: 193.174.75.54:53

Type	Value	TTL
SOA	mendel.ipk-gatersleben.de. hostmaster.ipk-gatersleben.de. 1792623062 86400 7200 3600000 172800	3600
NS	mendel.ipk-gatersleben.de.	3600
NS	dns-2.dfn.de.	3600
NS	dns-3.dfn.de.	3600
A	194.94.136.157	3600
MX	10 c1191.mx.srv.dfn.de.	3600
MX	10 a1191.mx.srv.dfn.de.	3600
MX	10 b1191.mx.srv.dfn.de.	3600
TXT	"MS=ms97299543"	3600
TXT	"ZOOM_verify_OJqR7JOLRLOYazuXHWfawg"	3600
TXT	"atlassian-domain-verification=a4sSMLgabBgdT2TFfBwL1ras1tfDH/ffiO3ybBok9CSjOo/Qgq60mc2Qks9Wnyea"	3600
TXT	"google-site-verification=JXt0pL1suwJJh2hY5pPkMc15TfL2QUqdYAEnfOeyA_w"	3600
TXT	"v=spf1 ip4:194.94.136.88/29 ip4:62.55.182.68 ip4:136.243.160.30 include:spf.mailsupport.dfn.de -all"	3600
CAA	0 iodef "mailto:admin@ipk-gatersleben.de"	3600
CAA	0 issue "pki.dfn.de"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 issue "sectigo.com"	3600

Checks

✓ TTLs within range #32

TTLs: A 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.
✓ CAA restricts issuance #35

Certificates may be issued by: pki.dfn.de, harica.gr, sectigo.com.