Domain report: hs-ansbach.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-1.dfn.de, dns-3.dfn.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns-1.dfn.de, dns-3.dfn.de
NS in the zone: dns-1.dfn.de, dns-3.dfn.de

Nameserver	Addresses	Network (AS)	Glue
dns-1.dfn.de	193.174.75.50 2001:638:d:b101::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	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns-1.dfn.de, dns-3.dfn.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 one network

all IPv4 addresses are in 193.174.75.0/24; all IPv6 addresses are in 2001:638:d::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
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): 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
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

info

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR
dns-1.dfn.de 193.174.75.50	NOERROR, 15 ms, authoritative	no	yes / yes	refused
dns-1.dfn.de 2001:638:d:b101::1	NOERROR, 15 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 193.174.75.58	NOERROR, 8 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 8 ms, authoritative	no	yes / yes	refused

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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: dns-1.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

info

serial 98466 · primary ns.hs-ansbach.de

Found

Primary (MNAME): ns.hs-ansbach.de
Contact (RNAME): rechenzentrum.hs-ansbach.de
Serial: 98466
Refresh / retry: 21600 s / 1800 s
Expire: 1209600 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
dns-1.dfn.de (193.174.75.50)	98466
dns-1.dfn.de (2001:638:d:b101::1)	98466
dns-3.dfn.de (193.174.75.58)	98466
dns-3.dfn.de (2001:638:d:b103::1)	98466

Checks

✓ Serial 98466 everywhere #22

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

SOA refresh 6h, retry 30m, expire 14d, negative TTL 15m.
i

Hidden master

The primary nameserver ns.hs-ansbach.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 rechenzentrum@hs-ansbach.de #25

The SOA RNAME rechenzentrum.hs-ansbach.de means rechenzentrum@hs-ansbach.de.
✓ Counter serial #26

The serial 98466 is a plain counter.

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 14-byte salt
Signatures valid until: 23 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
57752	RSASHA256 (8)	SHA256 0127388FAA2FB6BE…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
58111	ZSK (256)	RSASHA256 (8)
26544	ZSK (256)	RSASHA256 (8)
24856	ZSK (256)	RSASHA256 (8)
57752	KSK (257)	RSASHA256 (8)

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 57752 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 48h0m0s and created on demand; the current one was made at 2026-10-21 10:56 UTC and expires at 2026-10-23 11:26 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 14-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

pass

17 records at the apex

Found

Read from: 193.174.75.50:53

Type	Value	TTL
SOA	ns.hs-ansbach.de. rechenzentrum.hs-ansbach.de. 98466 21600 1800 1209600 900	3600
NS	dns-1.dfn.de.	3600
NS	dns-3.dfn.de.	3600
A	178.63.97.226	3600
MX	10 postrelay1.lrz.de.	3600
MX	10 postrelay2.lrz.de.	3600
TXT	"apple-domain-verification=dbXKNQBfbQ3qgZCi"	3600
TXT	"v=spf1 mx a:bvbvxmail.bib-bvb.de ip4:141.39.207.198 include:_spf.mail.lrz.de ~all"	3600
TXT	"43828d81b98744a75001580b7dfceafa"	3600
TXT	"adobe-idp-site-verification=25ab22c3c6f8d1436cb0e0fd7785fabd83c90554eebe9addcefcd6e1c8a46ca9"	3600
TXT	"MS=ms59237834"	3600
TXT	"google-site-verification=fyDDjwzmeAMBAGvyTQou_J2Vhh8UdzgI7CuRezOR2zY"	3600
TXT	"HARICA-htCOeoB4DtHzzBVptRV"	3600
TXT	"ZOOM_verify_xjzTt0CtRUefrAXOQiT6Yw"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 issue "pki.dfn.de"	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: letsencrypt.org, harica.gr, pki.dfn.de.