sciencemediacenter.de

.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

ns2.inwx.de, ns3.inwx.eu

Found

Parent zone

de

Delegation from

a.nic.de (194.0.0.53)

NS at the parent

ns2.inwx.de, ns3.inwx.eu

NS in the zone

ns2.inwx.de, ns3.inwx.eu

Checks

• i

  2 nameservers

  Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns2.inwx.de, ns3.inwx.eu.

  #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 different networks #10

  The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
• ✓ 2 autonomous systems #11

  The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 2 addresses; AS48596 (INWX - InterNetworX Management GmbH, DE): 2 addresses.
• ✓ Nameserver names under 2 TLDs #12

  Nameserver names use the TLDs .de, .eu.
• ✓ All reachable over IPv6 #13

  Every nameserver has an IPv6 address.

4 of 4 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 4 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: ns2.inwx.de: "reg-wie1"; ns3.inwx.eu: "INWX AXFR Server".

  #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.

serial 2026100700 · primary 213.218.4.139

Found

Primary (MNAME)

213.218.4.139

Contact (RNAME)

domainadmins.kta.email

Serial

2026100700

Refresh / retry

43200 s / 7200 s

Expire

2419200 s

Negative TTL

86400 s

Serial per nameserver

Checks

• ✓ Serial 2026100700 everywhere #22

  All nameservers serve the same version of the zone.
• ✓ Timers within recommendations #23

  SOA refresh 12h, retry 2h, expire 28d, negative TTL 1d.
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  Hidden master (not resolvable)

  The primary nameserver 213.218.4.139 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 domainadmins@kta.email #25

  The SOA RNAME domainadmins.kta.email means domainadmins@kta.email.
• ✓ Date-based serial #26

  The serial 2026100700 follows the YYYYMMDDnn convention (2026-10-07).

10 records at the apex

Found

Read from

176.97.158.104:53

Checks

• ✓ TTLs within range #32

  TTLs: A 5m, 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.
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  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