htw-dresden.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 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

deneb.dfn.de, hp1.rz.htw-dresden.de, hp2.rz.htw-dresden.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, hp1.rz.htw-dresden.de, hp2.rz.htw-dresden.de
NS in the zone
deneb.dfn.de, hp1.rz.htw-dresden.de, hp2.rz.htw-dresden.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-
hp1.rz.htw-dresden.de141.56.31.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.56.31.2
hp2.rz.htw-dresden.de141.56.31.3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.56.31.3

Checks

  • ✓ 3 nameservers #6
    Delegated to deneb.dfn.de, hp1.rz.htw-dresden.de, hp2.rz.htw-dresden.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: hp1.rz.htw-dresden.de, hp2.rz.htw-dresden.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 2 IPv4 /24s and 1 IPv6 /48.
  • 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): 4 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: hp1.rz.htw-dresden.de, hp2.rz.htw-dresden.de.
    #13

Nameservers

info

4 of 4 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
hp1.rz.htw-dresden.de 141.56.31.2NOERROR, 14 ms, authoritativenoyes / yesrefused-
hp2.rz.htw-dresden.de 141.56.31.3NOERROR, 15 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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: 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 2026091101 · primary hp2.rz.htw-dresden.de

Found

Primary (MNAME)
hp2.rz.htw-dresden.de
Contact (RNAME)
hostmaster.htw-dresden.de
Serial
2026091101
Refresh / retry
21600 s / 3600 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026091101
deneb.dfn.de (2001:638:800:1::9)2026091101
hp1.rz.htw-dresden.de (141.56.31.2)2026091101
hp2.rz.htw-dresden.de (141.56.31.3)2026091101

Checks

  • ✓ Serial 2026091101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver hp2.rz.htw-dresden.de is one of the listed nameservers.
  • ✓ Contact hostmaster@htw-dresden.de #25
    The SOA RNAME hostmaster.htw-dresden.de means hostmaster@htw-dresden.de.
  • ✓ Date-based serial #26
    The serial 2026091101 follows the YYYYMMDDnn convention (2026-09-11).

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
192.76.176.9:53
TypeValueTTL
SOAhp2.rz.htw-dresden.de. hostmaster.htw-dresden.de. 2026091101 21600 3600 3600000 8640086400
NShp1.rz.htw-dresden.de.86400
NShp2.rz.htw-dresden.de.86400
NSdeneb.dfn.de.86400
A141.56.16.3586400
MX10 b2831.mx.srv.dfn.de.600
MX10 c2831.mx.srv.dfn.de.600
MX10 a2831.mx.srv.dfn.de.600
TXT"autodesk-domain-verification=RCNlcborYWktNoQDuTv5"86400
TXT"MS=9321C574725D24D637CE8057439674F1E12B34E4"86400
TXT"v=spf1 a:smtp.htw-dresden.de ip4:141.56.50.8/29 ip4:141.56.16.128/28 ip4:141.56.16.224/28 -all"86400
TXT"adobe-idp-site-verification=1ddaecc93f68f9e7721e8fa9a9e3c68b0247a3ef368d34ab14c629732bf698d9"86400
TXT"google-site-verification=LIMHWrViulJ5YMFDD7HHXVNXxfMkBvOqilAXWSJzh5s"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.
  • 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