bht-berlin.de

Checked 21 October 2026, 21:40 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

warn

deneb.dfn.de, dns.bht-berlin.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns.bht-berlin.de
NS in the zone
deneb.dfn.de, dns.bht-berlin.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.bht-berlin.de141.64.0.200AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.64.0.200 2001:638:812:d::200

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: deneb.dfn.de, dns.bht-berlin.de.
    #6
  • ✓ 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.bht-berlin.de (glue 141.64.0.200, 2001:638:812:d::200, zone 141.64.0.200). 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 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: dns.bht-berlin.de.
    #13

Nameservers

info

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, 14 ms, authoritativenoyes / yesrefused0
dns.bht-berlin.de 141.64.0.200NOERROR, 13 ms, authoritativenoyes / yesrefused-

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.
  • 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 2012094271 · primary dns.bht-berlin.de

Found

Primary (MNAME)
dns.bht-berlin.de
Contact (RNAME)
hrz.bht-berlin.de
Serial
2012094271
Refresh / retry
10800 s / 3600 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2012094271
deneb.dfn.de (2001:638:800:1::9)2012094271
dns.bht-berlin.de (141.64.0.200)2012094271

Checks

  • ✓ Serial 2012094271 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 28d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns.bht-berlin.de is one of the listed nameservers.
  • ✓ Contact hrz@bht-berlin.de #25
    The SOA RNAME hrz.bht-berlin.de means hrz@bht-berlin.de.
  • ✓ Timestamp serial #26
    The serial 2012094271 is a Unix timestamp (2033-10-05 03:04 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

18 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAdns.bht-berlin.de. hrz.bht-berlin.de. 2012094271 10800 3600 2419200 90028800
NSdeneb.dfn.de.28800
NSdns.bht-berlin.de.28800
A141.64.5.7628800
MX10 mx2.bht-berlin.de.3600
MX10 mx1.bht-berlin.de.3600
TXT"apple-domain-verification=Na9vbCCdgaFBPU51"28800
TXT"HARICA-1YMJzUtfvAAdIa5NiiE"28800
TXT"MS=ms47663703"28800
TXT"v=spf1 include:_spf.bht-berlin.de ~all"28800
TXT"MV1xGWPLeB2vShOjxmVuHbX8BAOuIlPpxAUEVaCuJrSxq5isWUEs+Tj1/p+sjm6qeyq0UWTmVE1Nz5PmKIaBwg=="28800
TXT"google-site-verification=67xRNMNMr-rUMVDXBnPHlJh42rsNhJQHh_HVtxF4XOQ"28800
CAA0 issue "sectigo.com"28800
CAA0 issue "letsencrypt.org"28800
CAA0 iodef "mailto:ra@bht-berlin.de"28800
CAA0 issue "harica.gr"28800
CAA0 issue "pki.dfn.de"28800
CAA0 issuewild "harica.gr"28800

Checks

  • ✓ TTLs within range #32
    TTLs: A 8h, MX 1h, NS 8h. The NS TTL at the parent is 1d and in the zone 8h; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: sectigo.com, letsencrypt.org, harica.gr, pki.dfn.de.