Domain report: tu-bs.de

Registration

info

.de country-code

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.
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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

deneb.dfn.de, rzdnsprime.rz.tu-bs.de, rzdnssecond.rz.tu-bs.de

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: deneb.dfn.de, rzdnsprime.rz.tu-bs.de, rzdnssecond.rz.tu-bs.de
NS in the zone: deneb.dfn.de, rzdnsprime.rz.tu-bs.de, rzdnssecond.rz.tu-bs.de

Nameserver	Addresses	Network (AS)	Glue
deneb.dfn.de	192.76.176.9 2001:638:800:1::9	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
rzdnsprime.rz.tu-bs.de	134.169.12.124 2001:638:602:f033::2	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	134.169.12.124
rzdnssecond.rz.tu-bs.de	134.169.2.234 2001:638:602:1100::3	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	134.169.2.234 2001:638:602:1100::3

✓ 3 nameservers #6

Delegated to deneb.dfn.de, rzdnsprime.rz.tu-bs.de, rzdnssecond.rz.tu-bs.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: rzdnsprime.rz.tu-bs.de (glue 134.169.12.124, zone 134.169.12.124, 2001:638:602:f033::2). 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 3 IPv4 /24s and 2 IPv6 /48s.
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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	Version
deneb.dfn.de 192.76.176.9	NOERROR, 14 ms, authoritative	no	yes / yes	refused	0
deneb.dfn.de 2001:638:800:1::9	NOERROR, 13 ms, authoritative	no	yes / yes	refused	0
rzdnsprime.rz.tu-bs.de 134.169.12.124	NOERROR, 9 ms, authoritative	no	yes / yes	refused	none
rzdnsprime.rz.tu-bs.de 2001:638:602:f033::2	NOERROR, 9 ms, authoritative	no	yes / yes	refused	none
rzdnssecond.rz.tu-bs.de 134.169.2.234	NOERROR, 9 ms, authoritative	no	yes / yes	refused	none
rzdnssecond.rz.tu-bs.de 2001:638:602:1100::3	NOERROR, 9 ms, authoritative	no	yes / yes	refused	none

✓ 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: deneb.dfn.de: "0"; rzdnsprime.rz.tu-bs.de: "none"; rzdnssecond.rz.tu-bs.de: "none".

#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.

pass

serial 706290793 · primary rzdnsprime.rz.tu-bs.de

✓ Serial 706290793 everywhere #22

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

SOA refresh 6h, retry 1h, expire 21d, negative TTL 3h.
✓ Primary is a public nameserver #24

The primary nameserver rzdnsprime.rz.tu-bs.de is one of the listed nameservers.
✓ Contact noc@tu-bs.de #25

The SOA RNAME noc.tu-bs.de means noc@tu-bs.de.
✓ Counter serial #26

The serial 706290793 is a plain counter.

warn

Not signed

pass

21 records at the apex

Type	Value	TTL
SOA	rzdnsprime.rz.tu-bs.de. noc.tu-bs.de. 706290793 21600 3600 1814400 10800	300
NS	deneb.dfn.de.	86400
NS	rzdnsprime.rz.tu-bs.de.	86400
NS	rzdnssecond.rz.tu-bs.de.	86400
A	134.169.9.1	300
AAAA	2001:638:602:f004::2	300
MX	10 b1991.mx.srv.dfn.de.	300
MX	10 a1991.mx.srv.dfn.de.	300
MX	10 c1991.mx.srv.dfn.de.	300
TXT	"v=spf1 ip4:134.169.4.128/26 ~all"	300
TXT	"adobe-idp-site-verification=a03944d1f2ea68afe93f653b6e9621cd261ba07ea8cdeb5376757864cd72f553"	300
TXT	"MS=ms41660813"	300
TXT	"_telesec-domain-validation=336084_2025-05-09_srxBSiyhpe4ihOqOUMtHMIwONlLhBcJO5CB24HCqK4gTRggy5G"	300
TXT	"HARICA-CZP9tIKyAZTVLsjZ9lI"	300
TXT	"83fbd8eee9d9f02cc07478e05151bae1"	300
TXT	"cisco-ci-domain-verification=63a4857df37f990f6ee5e62ae44de0ffe10e34eddded04543a245cdc3c76a9e5"	300
CAA	0 issue "telesec.de"	300
CAA	0 issue "pki.dfn.de"	300
CAA	0 issue "harica.gr"	300
CAA	0 issuewild "harica.gr"	300
CAA	0 issuewild "pki.dfn.de"	300

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 5m, 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.
✓ CAA restricts issuance #35

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