Domain report: ruhr-uni-bochum.de

Registration

info

.de country-code

Found

TLD: .de (country-code)
Public suffix: .ruhr-uni-bochum.de
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. Domains are registered under the public suffix .ruhr-uni-bochum.de.

#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

info

dns-1.dfn.de, dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns-1.dfn.de, dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de
NS in the zone: dns-1.dfn.de, dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.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	-
dns1.ruhr-uni-bochum.de	134.147.231.10 2a05:3e00:1:1007::231:10	AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE	134.147.231.10 2a05:3e00:1:1007::231:10
dns2.ruhr-uni-bochum.de	134.147.220.178 2a05:3e00:9:1002::220:178	AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE	134.147.220.178 2a05:3e00:9:1002::220:178

Checks

✓ 3 nameservers #6

Delegated to dns-1.dfn.de, dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de.
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ Glue present and correct #8

Glue is published for the nameservers inside the zone: dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de.
✓ 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 3 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS29484 (RUB-AS - Ruhr-Universitaet Bochum, DE): 4 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses.
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

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns-1.dfn.de 193.174.75.50	NOERROR, 13 ms, authoritative	no	yes / yes	refused	0
dns-1.dfn.de 2001:638:d:b101::1	NOERROR, 15 ms, authoritative	no	yes / yes	refused	0
dns1.ruhr-uni-bochum.de 134.147.231.10	NOERROR, 7 ms, authoritative	no	yes / yes	refused	none
dns1.ruhr-uni-bochum.de 2a05:3e00:1:1007::231:10	NOERROR, 7 ms, authoritative	no	yes / yes	refused	none
dns2.ruhr-uni-bochum.de 134.147.220.178	NOERROR, 8 ms, authoritative	no	yes / yes	refused	none
dns2.ruhr-uni-bochum.de 2a05:3e00:9:1002::220:178	NOERROR, 8 ms, authoritative	no	yes / yes	refused	none

Checks

✓ 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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: dns-1.dfn.de: "0"; dns1.ruhr-uni-bochum.de: "none"; dns2.ruhr-uni-bochum.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.

SOA

warn

serial 2026489367 · primary dns1.ruhr-uni-bochum.de

Found

Primary (MNAME): dns1.ruhr-uni-bochum.de
Contact (RNAME): hostmaster.ruhr-uni-bochum.de
Serial: 2026489367
Refresh / retry: 600 s / 450 s
Expire: 604800 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
dns-1.dfn.de (193.174.75.50)	2026489367
dns-1.dfn.de (2001:638:d:b101::1)	2026489367
dns1.ruhr-uni-bochum.de (134.147.231.10)	2026489367
dns1.ruhr-uni-bochum.de (2a05:3e00:1:1007::231:10)	2026489367
dns2.ruhr-uni-bochum.de (134.147.220.178)	2026489367
dns2.ruhr-uni-bochum.de (2a05:3e00:9:1002::220:178)	2026489367

Checks

✓ Serial 2026489367 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

refresh 10m is outside 20m–1d. Current values: refresh 10m, retry 7m30s, expire 7d, negative TTL 15m.

#23
✓ Primary is a public nameserver #24

The primary nameserver dns1.ruhr-uni-bochum.de is one of the listed nameservers.
✓ Contact hostmaster@ruhr-uni-bochum.de #25

The SOA RNAME hostmaster.ruhr-uni-bochum.de means hostmaster@ruhr-uni-bochum.de.
✓ Timestamp serial #26

The serial 2026489367 is a Unix timestamp (2034-03-20 17:42 UTC).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 4 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
48370	ECDSAP256SHA256 (13)	SHA256 1ED79E2D2FFAB83E…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
40834	ZSK (256)	ECDSAP256SHA256 (13)
48370	KSK (257)	ECDSAP256SHA256 (13)
37620	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 48370 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-04 #30

The earliest DNSKEY/SOA signature expires at 2026-11-04 21:55 UTC.
✓ NSEC3 as recommended #31

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

Records

pass

21 records at the apex

Found

Read from: 193.174.75.50:53

Type	Value	TTL
SOA	dns1.ruhr-uni-bochum.de. hostmaster.ruhr-uni-bochum.de. 2026489367 600 450 604800 900	3600
NS	dns-1.dfn.de.	3600
NS	dns2.ruhr-uni-bochum.de.	3600
NS	dns1.ruhr-uni-bochum.de.	3600
A	134.147.64.10	3600
AAAA	2a05:3e00:1:1002::64:10	3600
MX	10 mi.ruhr-uni-bochum.de.	3600
TXT	"adobe-idp-site-verification=9dbefc807fe5d39976c34678175f86b0418bc5178b56febd01014c8a65fd0511"	3600
TXT	"apple-domain-verification=Do06TXqqgCK5apVH"	3600
TXT	"deepl-domain-verification=65180762979248a499adfd8eb1b73eb7"	3600
TXT	"google-site-verification=DjVLPWJ2ub7fqE8MVMN67zHZJF-5ZiW8JTbqtxJ9X5M"	3600
TXT	"mindmanager-verification=48b8b652842c93d93edcd6d693fbb40d9e1d037bd9bbb2083843929876b0aa66"	3600
TXT	"v=spf1 exists:%{ir}.%{v}._spfx.mail.ruhr-uni-bochum.de exists:%{ir}._ip.%{l1r+}._spfx.mail.ruhr-uni-bochum.de ~all"	3600
CAA	0 issue "telesec.de"	3600
CAA	0 issue "pki.dfn.de"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 issuewild ";"	3600
CAA	0 iodef "mailto:abuse@ruhr-uni-bochum.de"	3600
CAA	0 issue "zerossl.com"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issue "sectigo.com"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 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: telesec.de, pki.dfn.de, harica.gr, none (issuance forbidden), zerossl.com, letsencrypt.org, sectigo.com.