ad-bk.de

Checked 21 October 2026, 21:28 UTC · via 8.8.8.8
!Passed with warnings
19 passed 3 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

ns01.eschool.de, ns02.eschool.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns01.eschool.de, ns02.eschool.de
NS in the zone
ns01.eschool.de, ns02.eschool.de
NameserverAddressesNetwork (AS)Glue
ns01.eschool.de213.202.213.217AS24961 MYLOC-AS - WIIT AG, DE213.202.213.217
ns02.eschool.de213.202.213.218AS24961 MYLOC-AS - WIIT AG, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns01.eschool.de, ns02.eschool.de.
    #6
  • ✓ 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 one network
    all IPv4 addresses are in 213.202.213.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS24961 (MYLOC-AS - WIIT AG, DE): 2 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.eschool.de 213.202.213.217NOERROR, 7 ms, authoritativenoyes / yesrefusednone
ns02.eschool.de 213.202.213.218NOERROR, 9 ms, authoritativenoyes / yesrefusednone

Checks

  • ✓ All respond #14
    All 2 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: ns01.eschool.de: "none"; ns02.eschool.de: "none".
    #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 1769852683 · primary ns01.eschool.de

Found

Primary (MNAME)
ns01.eschool.de
Contact (RNAME)
170768.schule.nrw.de
Serial
1769852683
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
ns01.eschool.de (213.202.213.217)1769852683
ns02.eschool.de (213.202.213.218)1769852683

Checks

  • ✓ Serial 1769852683 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.eschool.de is one of the listed nameservers.
  • ✓ Contact 170768@schule.nrw.de #25
    The SOA RNAME 170768.schule.nrw.de means 170768@schule.nrw.de.
  • ✓ Timestamp serial #26
    The serial 1769852683 is a Unix timestamp (2026-01-31 09:44 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

info

8 records at the apex

Found

Read from
213.202.213.217:53
TypeValueTTL
SOAns01.eschool.de. 170768.schule.nrw.de. 1769852683 10800 3600 604800 1080086400
NSns01.eschool.de.86400
NSns02.eschool.de.86400
A213.202.213.21886400
MX10 mail.eschool.de.86400
TXT"MS=8EF820A801B7B402EC5F024EBEC73D131047BD96"86400
TXT"v=spf1 +a +mx -all"86400
TXT"adobe-idp-site-verification=c8b66bf9f73b93cb0160d220cc70ab258f133da4548086b27c970f55f7568bba"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