reutlingen-university.de

Checked 22 October 2026, 00:00 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 0 failed 7 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
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.
    #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

dns1.belwue.de, dns3.belwue.de, noc.fh-reutlingen.de, nos.fh-reutlingen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, noc.fh-reutlingen.de, nos.fh-reutlingen.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, noc.fh-reutlingen.de, nos.fh-reutlingen.de
NameserverAddressesNetwork (AS)Glue
dns1.belwue.de129.143.2.10 2001:7c0::53:10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.2.10 2001:7c0::53:10
dns3.belwue.de129.143.253.133 2001:7c0:0:253::133AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.253.133 2001:7c0:0:253::133
noc.fh-reutlingen.de134.103.32.2AS553 BELWUE - Universitaet Stuttgart, DE134.103.32.2
nos.fh-reutlingen.de134.103.32.3AS553 BELWUE - Universitaet Stuttgart, DE134.103.32.3

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, noc.fh-reutlingen.de, nos.fh-reutlingen.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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:7c0::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, 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
  • 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: noc.fh-reutlingen.de, nos.fh-reutlingen.de.
    #13

Nameservers

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.belwue.de 129.143.2.10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.belwue.de 2001:7c0::53:10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 129.143.253.133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 2001:7c0:0:253::133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
noc.fh-reutlingen.de 134.103.32.2NOERROR, 10 ms, authoritativenoyes / yesrefused-
nos.fh-reutlingen.de 134.103.32.3NOERROR, 9 ms, authoritativenoyes / yesrefused-

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns3.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)". Hide or replace the version string.
    #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 26270595 · primary noc.fh-reutlingen.de

Found

Primary (MNAME)
noc.fh-reutlingen.de
Contact (RNAME)
netz-admin.fh-reutlingen.de
Serial
26270595
Refresh / retry
21600 s / 3600 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)26270595
dns1.belwue.de (2001:7c0::53:10)26270595
dns3.belwue.de (129.143.253.133)26270595
dns3.belwue.de (2001:7c0:0:253::133)26270595
noc.fh-reutlingen.de (134.103.32.2)26270595
nos.fh-reutlingen.de (134.103.32.3)26270595

Checks

  • ✓ Serial 26270595 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver noc.fh-reutlingen.de is one of the listed nameservers.
  • ✓ Contact netz-admin@fh-reutlingen.de #25
    The SOA RNAME netz-admin.fh-reutlingen.de means netz-admin@fh-reutlingen.de.
  • ✓ Counter serial #26
    The serial 26270595 is a plain counter.

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

info

13 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAnoc.fh-reutlingen.de. netz-admin.fh-reutlingen.de. 26270595 21600 3600 604800 6001200
NSdns1.belwue.de.1200
NSnoc.fh-reutlingen.de.1200
NSdns3.belwue.de.1200
NSnos.fh-reutlingen.de.1200
A134.103.31.1411200
MX300 reutlingenuniversity-de02e.mail.protection.outlook.com.1200
TXT"sophos-domain-verification=53157a2ab762c59b13772dbbe5e94e3e68afbee8690b5587eb040792972e7d3c"3600
TXT"MS=ms62898662"3600
TXT"MS=ms44456247"3600
TXT"google-site-verification=_y8jLFmHW7kMqKnjuTUh6Wr3TX-6URHUVJW1Ai9tyuM"3600
TXT"v=spf1 ip4:193.197.148.18 include:_spf.belwue.de include:spf.protection.outlook.com ~all"3600
TXT"HARICA-4yedC77Rq4kWcez5vfF"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 20m, MX 20m, NS 20m. The NS TTL at the parent is 1d and in the zone 20m; 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.
  • i
    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