rub.de

Checked 22 October 2026, 00:01 UTC · via 8.8.8.8
!Passed with warnings
29 passed 1 warning 0 failed 3 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
Public suffix
.rub.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 .rub.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

warn

dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de, sdns01.de.tmr.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de, sdns01.de.tmr.net
NS in the zone
dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de
NameserverAddressesNetwork (AS)Glue
dns1.ruhr-uni-bochum.de134.147.231.10 2a05:3e00:1:1007::231:10AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE134.147.231.10 2a05:3e00:1:1007::231:10
dns2.ruhr-uni-bochum.de134.147.220.178 2a05:3e00:9:1002::220:178AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE AS29484 RUB-AS - Ruhr-Universitaet Bochum, DE134.147.220.178 2a05:3e00:9:1002::220:178
sdns01.de.tmr.net (parent only)185.249.168.154 2001:7d8:601::53AS12329 TMR - GLASFASER RUHR GmbH & Co. KG, DE AS12329 TMR - GLASFASER RUHR GmbH & Co. KG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de, sdns01.de.tmr.net.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: sdns01.de.tmr.net. dns1.ruhr-uni-bochum.de, dns2.ruhr-uni-bochum.de, sdns01.de.tmr.net report NS dns1.ruhr-uni-bochum.de dns2.ruhr-uni-bochum.de.
    #7
  • ✓ 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 different networks #10
    The nameservers are spread over 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12329 (TMR - GLASFASER RUHR GmbH & Co. KG, DE): 2 addresses; AS29484 (RUB-AS - Ruhr-Universitaet Bochum, DE): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.ruhr-uni-bochum.de 134.147.231.10NOERROR, 8 ms, authoritativenoyes / yesrefusednone
dns1.ruhr-uni-bochum.de 2a05:3e00:1:1007::231:10NOERROR, 8 ms, authoritativenoyes / yesrefusednone
dns2.ruhr-uni-bochum.de 134.147.220.178NOERROR, 8 ms, authoritativenoyes / yesrefusednone
dns2.ruhr-uni-bochum.de 2a05:3e00:9:1002::220:178NOERROR, 8 ms, authoritativenoyes / yesrefusednone
sdns01.de.tmr.net 185.249.168.154NOERROR, 9 ms, authoritativenoyes / yesrefused42
sdns01.de.tmr.net 2001:7d8:601::53NOERROR, 8 ms, authoritativenoyes / yesrefused42

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: dns1.ruhr-uni-bochum.de: "none"; dns2.ruhr-uni-bochum.de: "none"; sdns01.de.tmr.net: "42".
    #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

pass

serial 2026168833 · primary dns1.ruhr-uni-bochum.de

Found

Primary (MNAME)
dns1.ruhr-uni-bochum.de
Contact (RNAME)
hostmaster.ruhr-uni-bochum.de
Serial
2026168833
Refresh / retry
1800 s / 450 s
Expire
604800 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
dns1.ruhr-uni-bochum.de (134.147.231.10)2026168833
dns1.ruhr-uni-bochum.de (2a05:3e00:1:1007::231:10)2026168833
dns2.ruhr-uni-bochum.de (134.147.220.178)2026168833
dns2.ruhr-uni-bochum.de (2a05:3e00:9:1002::220:178)2026168833
sdns01.de.tmr.net (185.249.168.154)2026168833
sdns01.de.tmr.net (2001:7d8:601::53)2026168833

Checks

  • ✓ Serial 2026168833 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 30m, retry 7m30s, expire 7d, negative TTL 15m.
  • ✓ 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 2026168833 is a Unix timestamp (2034-03-17 00:40 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 tagAlgorithmDigestMatches a key
13152ECDSAP256SHA256 (13)SHA256 6BEAA9FA6482C004…yes

DNSKEY in the zone

Key tagRoleAlgorithm
13152KSK (257)ECDSAP256SHA256 (13)
32574ZSK (256)ECDSAP256SHA256 (13)
20527ZSK (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 13152 (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

20 records at the apex

Found

Read from
134.147.231.10:53
TypeValueTTL
SOAdns1.ruhr-uni-bochum.de. hostmaster.ruhr-uni-bochum.de. 2026168833 1800 450 604800 9003600
NSdns2.ruhr-uni-bochum.de.3600
NSdns1.ruhr-uni-bochum.de.3600
A134.147.64.103600
AAAA2a05:3e00:1:1002::64:103600
MX10 mi.ruhr-uni-bochum.de.3600
TXT"mindmanager-verification=48b8b652842c93d93edcd6d693fbb40d9e1d037bd9bbb2083843929876b0aa66"3600
TXT"adobe-idp-site-verification=9dbefc807fe5d39976c34678175f86b0418bc5178b56febd01014c8a65fd0511"3600
TXT"apple-domain-verification=Do06TXqqgCK5apVH"3600
TXT"google-site-verification=DjVLPWJ2ub7fqE8MVMN67zHZJF-5ZiW8JTbqtxJ9X5M"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
TXT"deepl-domain-verification=65180762979248a499adfd8eb1b73eb7"3600
CAA0 issue "sectigo.com"3600
CAA0 issue "harica.gr"3600
CAA0 issue "letsencrypt.org"3600
CAA0 iodef "mailto:abuse@ruhr-uni-bochum.de"3600
CAA0 issue "pki.dfn.de"3600
CAA0 issue "telesec.de"3600
CAA0 issue "zerossl.com"3600
CAA0 issuewild ";"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: sectigo.com, harica.gr, letsencrypt.org, pki.dfn.de, telesec.de, zerossl.com, none (issuance forbidden).