Domain report: fh-erfurt.de

Registration

info

.de country-code

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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

warn

dns-1.dfn.de, dns-2.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-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	-

✓ 3 nameservers #6

Delegated to dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de.
✓ 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
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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
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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.

info

6 of 6 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR
dns-1.dfn.de 193.174.75.50	NOERROR, 12 ms, authoritative	no	yes / yes	refused
dns-1.dfn.de 2001:638:d:b101::1	NOERROR, 12 ms, authoritative	no	yes / yes	refused
dns-2.dfn.de 193.174.75.54	NOERROR, 7 ms, authoritative	no	yes / yes	refused
dns-2.dfn.de 2001:638:d:b102::1	NOERROR, 7 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 193.174.75.58	NOERROR, 10 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 9 ms, authoritative	no	yes / yes	refused

✓ 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.
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Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: dns-1.dfn.de: "0"; 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.

info

serial 2026102101 · primary mars.fh-erfurt.de

✓ Serial 2026102101 everywhere #22

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

SOA refresh 8h, retry 2h, expire 35d, negative TTL 1h.
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Hidden master

The primary nameserver mars.fh-erfurt.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 hostmaster@fh-erfurt.de #25

The SOA RNAME hostmaster.fh-erfurt.de means hostmaster@fh-erfurt.de.
✓ Date-based serial #26

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

warn

Not signed

info

15 records at the apex

Type	Value	TTL
SOA	mars.fh-erfurt.de. hostmaster.fh-erfurt.de. 2026102101 28800 7200 3024000 3600	86400
NS	dns-2.dfn.de.	86400
NS	dns-3.dfn.de.	86400
NS	dns-1.dfn.de.	86400
A	195.37.147.16	86400
MX	10 a2371.mx.srv.dfn.de.	86400
MX	10 b2371.mx.srv.dfn.de.	86400
MX	10 c2371.mx.srv.dfn.de.	86400
TXT	"adobe-idp-site-verification=7d871a98ab167d376db08c29f1a70063739f85f3a970df38e77380cedabb569d"	86400
TXT	"MS=ms25989892"	86400
TXT	"v=spf1 ip4:141.24.186.224 ip4:141.24.4.8 ip4:141.24.179.56 ip4:141.24.179.34 ip4:141.24.179.35 include:_converia.fh-erfurt.de include:gbv.de include:spf.sendinblue.com ~all"	86400
TXT	"cisco-ci-domain-verification=2dfbf666087daf633b1905276fa39acf895e070ca4673a7ddd93d3d6221b5208"	86400
TXT	"MS=ms15202399"	86400
TXT	"google-site-verification=3Tdvf2h69r-UfIbzEn1vlBaptzKxCLRBfqF7ekqZbgs"	86400
TXT	"sendinblue-code:8f9e6b1fefe2af4743e182daab49ea1f"	86400