bsh.de

Checked 21 October 2026, 21:54 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

info

dns-1.dfn.de, dns-2.dfn.de, dns1.bsh.de, dns2.bsh.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, dns-2.dfn.de, dns1.bsh.de, dns2.bsh.de
NS in the zone
dns-1.dfn.de, dns-2.dfn.de, dns1.bsh.de, dns2.bsh.de
NameserverAddressesNetwork (AS)Glue
dns-1.dfn.de193.174.75.50 2001:638:d:b101::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-2.dfn.de193.174.75.54 2001:638:d:b102::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns1.bsh.de141.17.83.2AS41289 DWD-AS - Deutscher Wetterdienst, DE141.17.83.2
dns2.bsh.de141.17.83.200AS41289 DWD-AS - Deutscher Wetterdienst, DE141.17.83.200

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-1.dfn.de, dns-2.dfn.de, dns1.bsh.de, dns2.bsh.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: dns1.bsh.de, dns2.bsh.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:638:d::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS41289 (DWD-AS - Deutscher Wetterdienst, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 4 addresses.
  • 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: dns1.bsh.de, dns2.bsh.de.
    #13

Nameservers

fail

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 12 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 17 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 11 ms, authoritativenoyes / yesrefused0
dns1.bsh.de 141.17.83.2NOERROR, 16 ms, authoritativenono / yesrefused9.18.49-1~deb12u2-Debian
dns2.bsh.de 141.17.83.200NOERROR, 16 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian

Checks

  • ✓ All respond #14
    All 6 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: dns1.bsh.de: "9.18.49-1~deb12u2-Debian"; dns2.bsh.de: "9.18.49-1~deb12u2-Debian". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: dns1.bsh.de (141.17.83.2): dial tcp 141.17.83.2:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026100800 · primary dns1.bsh.de

Found

Primary (MNAME)
dns1.bsh.de
Contact (RNAME)
postmaster.bsh.de
Serial
2026100800
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2026100800
dns-1.dfn.de (2001:638:d:b101::1)2026100800
dns-2.dfn.de (193.174.75.54)2026100800
dns-2.dfn.de (2001:638:d:b102::1)2026100800
dns1.bsh.de (141.17.83.2)2026100800
dns2.bsh.de (141.17.83.200)2026100800

Checks

  • ✓ Serial 2026100800 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.bsh.de is one of the listed nameservers.
  • ✓ Contact postmaster@bsh.de #25
    The SOA RNAME postmaster.bsh.de means postmaster@bsh.de.
  • ✓ Date-based serial #26
    The serial 2026100800 follows the YYYYMMDDnn convention (2026-10-08).

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
193.174.75.50:53
TypeValueTTL
SOAdns1.bsh.de. postmaster.bsh.de. 2026100800 28800 7200 604800 8640086400
NSdns-1.dfn.de.86400
NSdns-2.dfn.de.86400
NSdns1.bsh.de.86400
NSdns2.bsh.de.86400
A141.38.3.3086400
MX10 ofcsgbbm.gbbmvi-wan.de.86400
MX20 zbcsgbbm.gbbmvi-wan.de.86400
TXT"google-site-verification=xUCrrak29RfwlPkcKhuY7WzERcSvTrwY5pZ2QyoSpik"86400
TXT"cisco-ci-domain-verification=3b1dc05a8789a17ec30e49f80a8c03c2169a93a22a6d4b301ed0928f52b7a1db"86400
TXT"apple-domain-verification=pJFbA1v0be6Z7OAH"86400
TXT"v=spf1 mx ~all"86400
TXT"MS=ms73247386"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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