Domain report: th-darmstadt.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

ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de
NS in the zone: ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de

Nameserver	Addresses	Network (AS)	Glue
ans1.net.hrz.tu-darmstadt.de	130.83.22.61 2001:41b8:83f:22::61	AS8365 MANDA - Man-da.de GmbH, DE AS8365 MANDA - Man-da.de GmbH, DE	130.83.22.61 2001:41b8:83f:22::61
ans2.net.hrz.tu-darmstadt.de	130.83.56.61 2001:41b8:83f:56::61	AS8365 MANDA - Man-da.de GmbH, DE AS8365 MANDA - Man-da.de GmbH, DE	130.83.56.61 2001:41b8:83f:56::61

Checks

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2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.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.
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One address family in one network

all IPv6 addresses are in 2001:41b8:83f::/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 (AS8365 (MANDA - Man-da.de GmbH, 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

pass

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ans1.net.hrz.tu-darmstadt.de 130.83.22.61	NOERROR, 5 ms, authoritative	no	yes / yes	refused	-
ans1.net.hrz.tu-darmstadt.de 2001:41b8:83f:22::61	NOERROR, 5 ms, authoritative	no	yes / yes	refused	-
ans2.net.hrz.tu-darmstadt.de 130.83.56.61	NOERROR, 5 ms, authoritative	no	yes / yes	refused	-
ans2.net.hrz.tu-darmstadt.de 2001:41b8:83f:56::61	NOERROR, 5 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.
✓ No version disclosed #17

The nameservers don't reveal their software version.
✓ 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 1112610055 · primary ans1.net.hrz.tu-darmstadt.de

Found

Primary (MNAME): ans1.net.hrz.tu-darmstadt.de
Contact (RNAME): hostmaster.net.hrz.tu-darmstadt.de
Serial: 1112610055
Refresh / retry: 21600 s / 3600 s
Expire: 3600000 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ans1.net.hrz.tu-darmstadt.de (130.83.22.61)	1112610055
ans1.net.hrz.tu-darmstadt.de (2001:41b8:83f:22::61)	1112610055
ans2.net.hrz.tu-darmstadt.de (130.83.56.61)	1112610055
ans2.net.hrz.tu-darmstadt.de (2001:41b8:83f:56::61)	1112610055

Checks

✓ Serial 1112610055 everywhere #22

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

SOA refresh 6h, retry 1h, expire 1000h, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver ans1.net.hrz.tu-darmstadt.de is one of the listed nameservers.
✓ Contact hostmaster@net.hrz.tu-darmstadt.de #25

The SOA RNAME hostmaster.net.hrz.tu-darmstadt.de means hostmaster@net.hrz.tu-darmstadt.de.
✓ Timestamp serial #26

The serial 1112610055 is a Unix timestamp (2005-04-04 10:20 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 16-byte salt
Signatures valid until: 18 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
32737	RSASHA256 (8)	SHA256 2442DAFD5302A34E…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
57879	ZSK (256)	RSASHA256 (8)
32737	KSK (257)	RSASHA256 (8)
27228	ZSK (256)	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 32737 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-18 #30

The earliest DNSKEY/SOA signature expires at 2026-11-18 21:04 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 16-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

info

3 records at the apex

Found

Read from: 130.83.22.61:53

Type	Value	TTL
SOA	ans1.net.hrz.tu-darmstadt.de. hostmaster.net.hrz.tu-darmstadt.de. 1112610055 21600 3600 3600000 86400	86400
NS	ans2.net.hrz.tu-darmstadt.de.	86400
NS	ans1.net.hrz.tu-darmstadt.de.	86400

Checks

✓ TTLs within range #32

TTLs: 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