th-brandenburg.de

Checked 22 October 2026, 00:40 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

baldur.fh-brandenburg.de, deneb.dfn.de, osis.fh-brandenburg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
baldur.fh-brandenburg.de, deneb.dfn.de, osis.fh-brandenburg.de
NS in the zone
baldur.fh-brandenburg.de, deneb.dfn.de, osis.fh-brandenburg.de
NameserverAddressesNetwork (AS)Glue
baldur.fh-brandenburg.de195.37.0.5AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE195.37.0.5
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-
osis.fh-brandenburg.de195.37.0.10AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE195.37.0.10

Checks

  • ✓ 3 nameservers #6
    Delegated to baldur.fh-brandenburg.de, deneb.dfn.de, osis.fh-brandenburg.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.
  • ✓ 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: baldur.fh-brandenburg.de, osis.fh-brandenburg.de.
    #13

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
baldur.fh-brandenburg.de 195.37.0.5NOERROR, 16 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-Ubuntu
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
osis.fh-brandenburg.de 195.37.0.10NOERROR, 16 ms, authoritativenoyes / yesrefused9.9.5-3ubuntu0.4-Ubuntu

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: baldur.fh-brandenburg.de: "9.18.39-0ubuntu0.22.04.7-Ubuntu"; osis.fh-brandenburg.de: "9.9.5-3ubuntu0.4-Ubuntu". 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 202602160 · primary baldur.fh-brandenburg.de

Found

Primary (MNAME)
baldur.fh-brandenburg.de
Contact (RNAME)
schulz.fh-brandenburg.de
Serial
202602160
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
800 s

Serial per nameserver

NameserverSerial
baldur.fh-brandenburg.de (195.37.0.5)202602160
deneb.dfn.de (192.76.176.9)202602160
deneb.dfn.de (2001:638:800:1::9)202602160
osis.fh-brandenburg.de (195.37.0.10)202602160

Checks

  • ✓ Serial 202602160 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 13m20s.
  • ✓ Primary is a public nameserver #24
    The primary nameserver baldur.fh-brandenburg.de is one of the listed nameservers.
  • ✓ Contact schulz@fh-brandenburg.de #25
    The SOA RNAME schulz.fh-brandenburg.de means schulz@fh-brandenburg.de.
  • ✓ Counter serial #26
    The serial 202602160 is a plain counter.

DNSSEC

info

Not signed

Found

Validated by resolver
no
Lookup error: read udp 46.225.38.91:55883->195.37.0.5:53: i/o timeout

Checks

  • i
    Could not be checked
    The DNSSEC lookup failed, so this could not be checked: read udp 46.225.38.91:55883->195.37.0.5:53: i/o timeout
    #27

Records

info

7 records at the apex

Found

Read from
195.37.0.5:53
TypeValueTTL
SOAbaldur.fh-brandenburg.de. schulz.fh-brandenburg.de. 202602160 28800 7200 604800 80086400
A195.37.0.20986400
TXT"apple-domain-verification=eFhMctHmsRxGkmP9"86400
TXT"adobe-idp-site-verification=897f90f339daed7babd11534f5ac59668e9527a9a095e3942db53c76b95a9f8d"86400
TXT"HARICA-ZmqUKFp8OZCLOlry7ri"86400
TXT"google-site-verification=oP5cOmbWtWxSHb-VmB24LCWzUvg5hrXuRsQ4ucuV1xk"86400
TXT"v=spf1 ip4:195.37.0.8/32 ip4:195.37.0.17/32 ip4:193.174.97.18/32 ip6:2001:4ca0:10b:6::c1ae:6112 include:spf.sosafe.de include:_spf.o105.mx.srv.dfn.de ~all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 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