kreis-mettmann.de

Checked 21 October 2026, 23:10 UTC · via 8.8.8.8
✗Problems found
21 passed 3 warnings 1 failed 4 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

dns1.kreis-mettmann.de, pns.dtag.de, secondary004.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.kreis-mettmann.de, pns.dtag.de, secondary004.dtag.net
NS in the zone
dns1.kreis-mettmann.de, dns2.kreis-mettmann.de, pns.dtag.de, secondary004.dtag.net
NameserverAddressesNetwork (AS)Glue
dns1.kreis-mettmann.de195.145.216.44AS3320 DTAG - Deutsche Telekom AG, DE195.145.216.44
dns2.kreis-mettmann.de (zone only)195.145.216.46AS3320 DTAG - Deutsche Telekom AG, DE-
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100
secondary004.dtag.net195.244.245.27 2a00:fa8:3:0:100:0:4:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.kreis-mettmann.de, pns.dtag.de, secondary004.dtag.net.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: dns2.kreis-mettmann.de. dns1.kreis-mettmann.de, dns2.kreis-mettmann.de, pns.dtag.de, secondary004.dtag.net report NS dns1.kreis-mettmann.de dns2.kreis-mettmann.de pns.dtag.de secondary004.dtag.net.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: dns1.kreis-mettmann.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS3320 (DTAG - Deutsche Telekom AG, DE): 4 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns1.kreis-mettmann.de, dns2.kreis-mettmann.de.
    #13

Nameservers

fail

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.kreis-mettmann.de 195.145.216.44NOERROR, 9 ms, authoritativenono / yesrefused9.18.39-0ubuntu0.22.04.6-Ubuntu
dns2.kreis-mettmann.de 195.145.216.46NOERROR, 8 ms, authoritativenono / yesrefused9.18.39-0ubuntu0.22.04.6-Ubuntu
pns.dtag.de 194.25.0.125NOERROR, 10 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 195.244.245.27NOERROR, 12 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1NOERROR, 16 ms, authoritativenoyes / yesrefusedDomainNameServer

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.kreis-mettmann.de: "9.18.39-0ubuntu0.22.04.6-Ubuntu"; dns2.kreis-mettmann.de: "9.18.39-0ubuntu0.22.04.6-Ubuntu". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: dns1.kreis-mettmann.de (195.145.216.44): dial tcp 195.145.216.44:53: i/o timeout; dns2.kreis-mettmann.de (195.145.216.46): dial tcp 195.145.216.46:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026092601 · primary dns1.kreis-mettmann.de

Found

Primary (MNAME)
dns1.kreis-mettmann.de
Contact (RNAME)
kme.kreis-mettmann.de
Serial
2026092601
Refresh / retry
14400 s / 7200 s
Expire
604800 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
dns1.kreis-mettmann.de (195.145.216.44)2026092601
dns2.kreis-mettmann.de (195.145.216.46)2026092601
pns.dtag.de (194.25.0.125)2026092601
pns.dtag.de (2003:40:8000::100)2026092601
secondary004.dtag.net (195.244.245.27)2026092601
secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1)2026092601

Checks

  • ✓ Serial 2026092601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 2h, expire 7d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.kreis-mettmann.de is one of the listed nameservers.
  • ✓ Contact kme@kreis-mettmann.de #25
    The SOA RNAME kme.kreis-mettmann.de means kme@kreis-mettmann.de.
  • ✓ Date-based serial #26
    The serial 2026092601 follows the YYYYMMDDnn convention (2026-09-26).

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

13 records at the apex

Found

Read from
195.145.216.44:53
TypeValueTTL
SOAdns1.kreis-mettmann.de. kme.kreis-mettmann.de. 2026092601 14400 7200 604800 108003600
NSdns2.kreis-mettmann.de.86400
NSpns.dtag.de.86400
NSdns1.kreis-mettmann.de.86400
NSsecondary004.dtag.net.86400
A195.145.216.3786400
MX10 mx2.as-scan.de.86400
MX10 mail-in.as-scan.de.86400
TXT"v=spf1 a mx ip4:195.145.216.0/24 include:krzn.de a:sb1-doi-mailer.it.nrw.de a:sb1-doi-mailer2.it.nrw.de -all"86400
TXT"MS=ms80432776"86400
TXT"brevo-code:be4a817772a43a57db7b7bcf9085fdff"86400
TXT"apple-domain-verification=fEpZM2BB8e0Bje6k"86400
TXT"_telesec-domain-validation=348562_2025-11-17_pugIjzJUn9sOYa5Jji5AdgqlvZPVSsiKpg1JXM3x2JaNntUzBL"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