bildung-lsa.de

Checked 21 October 2026, 21:40 UTC · via 8.8.8.8
iAll checks passed
24 passed 0 warnings 0 failed 9 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

dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de, ns.bildung-lsa.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de, ns.bildung-lsa.de
NS in the zone
dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de, ns.bildung-lsa.de
NameserverAddressesNetwork (AS)Glue
dfnserv2.urz.uni-magdeburg.de141.44.1.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.44.1.2
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-
ns.bildung-lsa.de141.44.211.12AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.44.211.12

Checks

  • ✓ 4 nameservers #6
    Delegated to dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de, ns.bildung-lsa.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: ns.bildung-lsa.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
  • 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): 6 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: dfnserv2.urz.uni-magdeburg.de, ns.bildung-lsa.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dfnserv2.urz.uni-magdeburg.de 141.44.1.2NOERROR, 11 ms, authoritativenoyes / yesrefused-
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
ns.bildung-lsa.de 141.44.211.12NOERROR, 11 ms, authoritativenoyes / yesrefused-

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: 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

pass

serial 2026102001 · primary ns.bildung-lsa.de

Found

Primary (MNAME)
ns.bildung-lsa.de
Contact (RNAME)
hostmaster.bildung-lsa.de
Serial
2026102001
Refresh / retry
28800 s / 3600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dfnserv2.urz.uni-magdeburg.de (141.44.1.2)2026102001
dns-2.dfn.de (193.174.75.54)2026102001
dns-2.dfn.de (2001:638:d:b102::1)2026102001
dns-3.dfn.de (193.174.75.58)2026102001
dns-3.dfn.de (2001:638:d:b103::1)2026102001
ns.bildung-lsa.de (141.44.211.12)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 1h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.bildung-lsa.de is one of the listed nameservers.
  • ✓ Contact hostmaster@bildung-lsa.de #25
    The SOA RNAME hostmaster.bildung-lsa.de means hostmaster@bildung-lsa.de.
  • ✓ Date-based serial #26
    The serial 2026102001 follows the YYYYMMDDnn convention (2026-10-20).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
2 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
50167RSASHA256 (8)SHA256 B285CB4561C662C3…yes

DNSKEY in the zone

Key tagRoleAlgorithm
41235ZSK (256)RSASHA256 (8)
50167KSK (257)RSASHA256 (8)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 50167 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-02 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-02 18:41 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

8 records at the apex

Found

Read from
141.44.1.2:53
TypeValueTTL
SOAns.bildung-lsa.de. hostmaster.bildung-lsa.de. 2026102001 28800 3600 1209600 36001800
NSdns-3.dfn.de.1800
NSns.bildung-lsa.de.1800
NSdns-2.dfn.de.1800
NSdfnserv2.urz.uni-magdeburg.de.1800
A141.44.211.251800
MX100 mx01.bildung-lsa.de.900
TXT"v=spf1 ip4:141.44.211.15 ip4:141.44.211.16 ~all"900

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, MX 15m, NS 30m. The NS TTL at the parent is 1d and in the zone 30m; 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