hfbk-dresden.de

Checked 21 October 2026, 22:50 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

deneb.dfn.de, rudi.hfbk-dresden.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, rudi.hfbk-dresden.de
NS in the zone
deneb.dfn.de, rudi.hfbk-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-
rudi.hfbk-dresden.de194.94.197.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.197.1

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: deneb.dfn.de, rudi.hfbk-dresden.de.
    #6
  • ✓ 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: rudi.hfbk-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): 3 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: rudi.hfbk-dresden.de.
    #13

Nameservers

warn

3 of 3 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, 13 ms, authoritativenoyes / yesrefused0
rudi.hfbk-dresden.de 194.94.197.1NOERROR, 15 ms, authoritativenoyes / yesrefused9.7.0-P1

Checks

  • ✓ All respond #14
    All 3 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: rudi.hfbk-dresden.de: "9.7.0-P1". 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 2026102101 · primary rudi.hfbk-dresden.de

Found

Primary (MNAME)
rudi.hfbk-dresden.de
Contact (RNAME)
postmaster.hfbk-dresden.de
Serial
2026102101
Refresh / retry
7200 s / 1800 s
Expire
1209600 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026102101
deneb.dfn.de (2001:638:800:1::9)2026102101
rudi.hfbk-dresden.de (194.94.197.1)2026102101

Checks

  • ✓ Serial 2026102101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 30m, expire 14d, negative TTL 2h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver rudi.hfbk-dresden.de is one of the listed nameservers.
  • ✓ Contact postmaster@hfbk-dresden.de #25
    The SOA RNAME postmaster.hfbk-dresden.de means postmaster@hfbk-dresden.de.
  • ✓ Date-based serial #26
    The serial 2026102101 follows the YYYYMMDDnn convention (2026-10-21).

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

14 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOArudi.hfbk-dresden.de. postmaster.hfbk-dresden.de. 2026102101 7200 1800 1209600 72007200
NSrudi.hfbk-dresden.de.7200
NSdeneb.dfn.de.7200
A62.138.219.1317200
MX10 b2921.mx.srv.dfn.de.7200
MX10 c2921.mx.srv.dfn.de.7200
MX10 a2921.mx.srv.dfn.de.7200
TXT"MS=22101CE150623B8399AE1AB47E735CDE0D5FF29F"7200
TXT"HARICA-dCWed1P4v60sMG2XFCB"7200
TXT"IFxkOxt7XBbaVPBoMcMnHUlvHVApAc+P7wLtnAO8d0RwCFGMU2fJuFAaywmJYEqYYPR5bS+c1mfSDHNPsrPnjQ=="7200
TXT"v=spf1 a:rz.hfbk-dresden.de mx ~all"7200
TXT"adobe-idp-site-verification=f79b519cf726aff927f2d66b1c1c6a98c501616101eae981c8bf3c95bcbf4c37"7200
TXT"apple-domain-verification=76GGDk23Br36QmaR"7200
TXT"google-site-verification=QohSOoMPFIzRPYd1Qe-HPYRkkoiBAXYtiQiECvY-sgc"7200

Checks

  • ✓ TTLs within range #32
    TTLs: A 2h, MX 2h, NS 2h. The NS TTL at the parent is 1d and in the zone 2h; 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