bergbaumuseum.de

Checked 21 October 2026, 21:37 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, dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de
NS in the zone
deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.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-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-
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.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 2 IPv6 /48s.
  • 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): 8 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 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-1.dfn.de 193.174.75.50NOERROR, 12 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 16 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 14 ms, authoritativenoyes / yesrefused0

Checks

  • ✓ All respond #14
    All 8 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"; dns-1.dfn.de: "0"; dns-2.dfn.de: "0"; dns-3.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

info

serial 2026101200 · primary d-ns301.server.est1816.de

Found

Primary (MNAME)
d-ns301.server.est1816.de
Contact (RNAME)
hostmaster.dmt-lb.de
Serial
2026101200
Refresh / retry
10000 s / 1800 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026101200
deneb.dfn.de (2001:638:800:1::9)2026101200
dns-1.dfn.de (193.174.75.50)2026101200
dns-1.dfn.de (2001:638:d:b101::1)2026101200
dns-2.dfn.de (193.174.75.54)2026101200
dns-2.dfn.de (2001:638:d:b102::1)2026101200
dns-3.dfn.de (193.174.75.58)2026101200
dns-3.dfn.de (2001:638:d:b103::1)2026101200

Checks

  • ✓ Serial 2026101200 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 30m, expire 7d, negative TTL 1h.
  • i
    Hidden master (not resolvable)
    The primary nameserver d-ns301.server.est1816.de is not listed as a nameserver and does not resolve publicly: a hidden master, or a placeholder name. Some tools (e.g. dynamic updates) use MNAME to find the primary.
    #24
  • ✓ Contact hostmaster@dmt-lb.de #25
    The SOA RNAME hostmaster.dmt-lb.de means hostmaster@dmt-lb.de.
  • ✓ Date-based serial #26
    The serial 2026101200 follows the YYYYMMDDnn convention (2026-10-12).

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

12 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAd-ns301.server.est1816.de. hostmaster.dmt-lb.de. 2026101200 10000 1800 604800 3600300
NSdns-3.dfn.de.300
NSdeneb.dfn.de.300
NSdns-1.dfn.de.300
NSdns-2.dfn.de.300
A185.243.134.242300
MX10 d-mx020.server.est1816.de.300
TXT"ZOOM_verify_Egphz11rTlyCh6k5j8akjQ"300
TXT"google-site-verification=t0fY1qd8FTcYx375pqEKz7ZcamwgD825Bqtrp3I1MXk"300
TXT"MS=ms67850384"300
TXT"HARICA-pqK3pP7YyHZuMbKgs7l"300
TXT"v=spf1 a mx ip4:195.37.4.0/23 ip4:195.37.6.0/24 ip4:178.77.115.33/32 ip6:2a01:488:42:1000:b24d:7321:ff99:4c44/128 include:spf.crsend.com include:agenturserver.de ~all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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