hs-mittweida.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
✗Problems found
20 passed 2 warnings 1 failed 6 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

warn

deneb.dfn.de, dns.hs-mittweida.de, dns2.hs-mittweida.de, eris.hrz.tu-chemnitz.de, tigger.scc.uni-weimar.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns.hs-mittweida.de, dns2.hs-mittweida.de, eris.hrz.tu-chemnitz.de, tigger.scc.uni-weimar.de
NS in the zone
deneb.dfn.de, dns.hs-mittweida.de, dns2.hs-mittweida.de, eris.hrz.tu-chemnitz.de, tigger.scc.uni-weimar.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns.hs-mittweida.de141.55.192.50 2001:638:91c:3000::32AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.55.192.50
dns2.hs-mittweida.de141.55.192.51 2001:638:91c:3000::33AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.55.192.51
eris.hrz.tu-chemnitz.de134.109.133.17 2001:638:911:b01:134:109:133:17AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE134.109.133.17 2001:638:911:b01:134:109:133:17
tigger.scc.uni-weimar.de141.54.1.3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.54.1.3

Checks

  • ✓ 5 nameservers #6
    Delegated to deneb.dfn.de, dns.hs-mittweida.de, dns2.hs-mittweida.de, eris.hrz.tu-chemnitz.de, tigger.scc.uni-weimar.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: dns.hs-mittweida.de (glue 141.55.192.50, zone 141.55.192.50, 2001:638:91c:3000::32); dns2.hs-mittweida.de (glue 141.55.192.51, zone 141.55.192.51, 2001:638:91c:3000::33). 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 4 IPv4 /24s and 3 IPv6 /48s.
  • i
    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): 9 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: tigger.scc.uni-weimar.de.
    #13

Nameservers

fail

7 of 9 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns.hs-mittweida.de 141.55.192.50NOERROR, 17 ms, authoritativenoyes / yesrefused-
dns.hs-mittweida.de 2001:638:91c:3000::32no responsenono / no--
dns2.hs-mittweida.de 141.55.192.51NOERROR, 18 ms, authoritativenoyes / yesrefused-
dns2.hs-mittweida.de 2001:638:91c:3000::33no responsenono / no--
eris.hrz.tu-chemnitz.de 134.109.133.17NOERROR, 17 ms, authoritativenoyes / yesrefused-
eris.hrz.tu-chemnitz.de 2001:638:911:b01:134:109:133:17NOERROR, 13 ms, authoritativenoyes / yesrefused-
tigger.scc.uni-weimar.de 141.54.1.3NOERROR, 13 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: dns.hs-mittweida.de (2001:638:91c:3000::32): read udp [2a01:4f8:1c1c:eebf::1]:51728->[2001:638:91c:3000::32]:53: i/o timeout; dns2.hs-mittweida.de (2001:638:91c:3000::33): read udp [2a01:4f8:1c1c:eebf::1]:60000->[2001:638:91c:3000::33]:53: i/o timeout.
    #14
  • ✓ 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: deneb.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.

SOA

pass

serial 1762434302 · primary dns.hs-mittweida.de

Found

Primary (MNAME)
dns.hs-mittweida.de
Contact (RNAME)
admin.hs-mittweida.de
Serial
1762434302
Refresh / retry
43200 s / 7200 s
Expire
2419200 s
Negative TTL
3660 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)1762434302
deneb.dfn.de (2001:638:800:1::9)1762434302
dns.hs-mittweida.de (141.55.192.50)1762434302
dns2.hs-mittweida.de (141.55.192.51)1762434302
eris.hrz.tu-chemnitz.de (134.109.133.17)1762434302
eris.hrz.tu-chemnitz.de (2001:638:911:b01:134:109:133:17)1762434302
tigger.scc.uni-weimar.de (141.54.1.3)1762434302

Checks

  • ✓ Serial 1762434302 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 28d, negative TTL 61m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns.hs-mittweida.de is one of the listed nameservers.
  • ✓ Contact admin@hs-mittweida.de #25
    The SOA RNAME admin.hs-mittweida.de means admin@hs-mittweida.de.
  • ✓ Timestamp serial #26
    The serial 1762434302 is a Unix timestamp (2025-11-06 13:05 UTC).

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

pass

19 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAdns.hs-mittweida.de. admin.hs-mittweida.de. 1762434302 43200 7200 2419200 366086400
NSdns.hs-mittweida.de.86400
NStigger.scc.uni-weimar.de.86400
NSeris.hrz.tu-chemnitz.de.86400
NSdns2.hs-mittweida.de.86400
NSdeneb.dfn.de.86400
A141.55.193.4586400
MX10 c1021.mx.srv.dfn.de.600
MX10 a1021.mx.srv.dfn.de.600
MX10 b1021.mx.srv.dfn.de.600
TXT"v=spf1 ip4:141.55.192.0/24 include:servers.mcsv.net include:spf.sendinblue.com include:_spf.2askmail.com ?all"3600
TXT"adobe-idp-site-verification=869fc4a956a209b983ee85868378b646da129b89292f63139b6f9e90db0b4008"3600
TXT"ZOOM_verify_1DdljmQ8RtCoXEK5aYhVlA"3600
TXT"Sendinblue-code:7022d8e0adb306e65c2d54f0334bacd6"3600
TXT"google-site-verification=rKQPQ295B7FfL_n9gzXTLSfNfxIO02lgKHT1QcmaqDs"3600
TXT"MS=B37F6FAEC8B32290D53745EDF62FCC9D12B5346D"3600
CAA0 issue "harica.gr"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issue "letsencrypt.org"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 10m, 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: harica.gr, pki.dfn.de, letsencrypt.org.