bildung-rp.de

Checked 21 October 2026, 21:40 UTC · via 8.8.8.8
!Passed with warnings
21 passed 6 warnings 0 failed 5 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

ns.bildung-rp.de, ns02.versatel.de, ns03.versatel.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.bildung-rp.de, ns02.versatel.de, ns03.versatel.de
NS in the zone
ns.bildung-rp.de, ns01.bildung-rp.de, ns02.bildung-rp.de, ns02.versatel.de, ns03.versatel.de
NameserverAddressesNetwork (AS)Glue
ns.bildung-rp.de217.198.244.11AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE217.198.244.11
ns01.bildung-rp.de (zone only)217.198.244.11AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE-
ns02.bildung-rp.de (zone only)217.198.245.71AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE-
ns02.versatel.de212.7.128.165AS8881 VERSATEL - 1&1 Versatel GmbH, DE212.7.128.165
ns03.versatel.de193.219.15.17AS8881 VERSATEL - 1&1 Versatel GmbH, DE193.219.15.17

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.bildung-rp.de, ns02.versatel.de, ns03.versatel.de.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ns01.bildung-rp.de, ns02.bildung-rp.de. ns.bildung-rp.de, ns01.bildung-rp.de, ns02.bildung-rp.de, ns02.versatel.de, ns03.versatel.de report NS ns.bildung-rp.de ns01.bildung-rp.de ns02.bildung-rp.de ns02.versatel.de ns03.versatel.de.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns.bildung-rp.de.
  • ✓ 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 4 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS2857 (RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE): 3 addresses; AS8881 (VERSATEL - 1&1 Versatel GmbH, DE): 2 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.bildung-rp.de 217.198.244.11NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns01.bildung-rp.de 217.198.244.11NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns02.bildung-rp.de 217.198.245.71NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns02.versatel.de 212.7.128.165NOERROR, 17 ms, authoritativenoyes / yesrefusedNo version info available (refused).
ns03.versatel.de 193.219.15.17NOERROR, 12 ms, authoritativenoyes / yesrefusedNo version info available (refused).

Checks

  • ✓ All respond #14
    All 5 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: ns02.versatel.de: "No version info available (refused)."; ns03.versatel.de: "No version info available (refused).".
    #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

warn

serial 2026101901 · primary ns01.bildung-rp.de

Found

Primary (MNAME)
ns01.bildung-rp.de
Contact (RNAME)
it-support.bildung-rp.de
Serial
2026101901
Refresh / retry
600 s / 7200 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns.bildung-rp.de (217.198.244.11)2026101901
ns01.bildung-rp.de (217.198.244.11)2026101901
ns02.bildung-rp.de (217.198.245.71)2026100101
ns02.versatel.de (212.7.128.165)2026101901
ns03.versatel.de (193.219.15.17)2026101901

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2026100101 on ns02.bildung-rp.de (217.198.245.71); 2026101901 on ns.bildung-rp.de (217.198.244.11), ns01.bildung-rp.de (217.198.244.11), ns02.versatel.de (212.7.128.165), ns03.versatel.de (193.219.15.17). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • !
    Unusual SOA timers
    refresh 10m is outside 20m–1d; retry 2h should be shorter than refresh 10m. Current values: refresh 10m, retry 2h, expire 14d, negative TTL 10m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.bildung-rp.de is one of the listed nameservers.
  • ✓ Contact it-support@bildung-rp.de #25
    The SOA RNAME it-support.bildung-rp.de means it-support@bildung-rp.de.
  • ✓ Date-based serial #26
    The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC
Signatures valid until
29 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
2805KSK (257)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 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

warn

17 records at the apex

Found

Read from
217.198.244.11:53
TypeValueTTL
SOAns01.bildung-rp.de. it-support.bildung-rp.de. 2026101901 600 7200 1209600 6003600
NSns03.versatel.de.60
NSns02.versatel.de.60
NSns01.bildung-rp.de.60
NSns02.bildung-rp.de.60
NSns.bildung-rp.de.60
A217.198.244.33600
MX30 mail04.bildung-rp.de.60
MX40 mail05.bildung-rp.de.60
MX10 mail.bildung-rp.de.60
MX20 mail02.bildung-rp.de.60
TXT"v=spf1 mx a ip4:83.243.48.64/16 ip4:217.198.244.46 ip4:217.198.244.47 ip4:217.198.245.67 ip4:217.198.245.76 ip4:217.198.245.77 a:mail.bildung-rp.de a:mail02.bildung-rp.de a:mail04.bildung-rp.de a:mail05.bildung-rp.de ~all"3600
TXT"ssto0s3b4ovqm0t8nrticpqcdd"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issuewild "godaddy.com"3600
CAA0 issue "godaddy.com"3600
CAA0 issuewild "letsencrypt.org"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m), NS (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1m; resolvers may use either.
    #32
  • ✓ 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: letsencrypt.org, godaddy.com.