dueren.de

Checked 21 October 2026, 22:15 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 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

ns1.as12759.de, ns2.as12759.de, ns3.as12759.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.as12759.de, ns2.as12759.de, ns3.as12759.de
NS in the zone
ns1.as12759.de, ns2.as12759.de, ns3.as12759.de
NameserverAddressesNetwork (AS)Glue
ns1.as12759.de212.16.224.5 2a01:3d8:2:0:171c:53:1:1AS12759 SOCO-AS - Stephan Fuss trading as SoftCom Datensysteme, DE AS12759 SOCO-AS - Stephan Fuss trading as SoftCom Datensysteme, DE212.16.224.5 2a01:3d8:2:0:171c:53:1:1
ns2.as12759.de212.16.238.252 2a01:3d8:2:100:171c:53:1:1AS12759 SOCO-AS - Stephan Fuss trading as SoftCom Datensysteme, DE AS12759 SOCO-AS - Stephan Fuss trading as SoftCom Datensysteme, DE212.16.238.252 2a01:3d8:2:4:171c:53:1:1
ns3.as12759.de20.199.10.217AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US20.199.10.217

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.as12759.de, ns2.as12759.de, ns3.as12759.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns2.as12759.de (glue 212.16.238.252, 2a01:3d8:2:4:171c:53:1:1, zone 212.16.238.252, 2a01:3d8:2:100:171c:53:1:1). Update the glue at your registrar.
    #8
  • ✓ 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 2a01:3d8:2::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12759 (SOCO-AS - Stephan Fuss trading as SoftCom Datensysteme, DE): 4 addresses; AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 1 address.
  • 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: ns3.as12759.de.
    #13

Nameservers

info

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.as12759.de 212.16.224.5NOERROR, 8 ms, authoritativenoyes / yesrefusedunknown
ns1.as12759.de 2a01:3d8:2:0:171c:53:1:1NOERROR, 9 ms, authoritativenoyes / yesrefusedunknown
ns2.as12759.de 212.16.238.252NOERROR, 8 ms, authoritativenoyes / yesrefusedSOCO Network Solutions GmbH
ns2.as12759.de 2a01:3d8:2:100:171c:53:1:1NOERROR, 8 ms, authoritativenoyes / yesrefusedSOCO Network Solutions GmbH
ns3.as12759.de 20.199.10.217NOERROR, 12 ms, authoritativenoyes / yesrefusedSOCO Network Solutions GmbH

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: ns1.as12759.de: "unknown"; ns2.as12759.de: "SOCO Network Solutions GmbH"; ns3.as12759.de: "SOCO Network Solutions GmbH".
    #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 2026100701 · primary ns1.as12759.de

Found

Primary (MNAME)
ns1.as12759.de
Contact (RNAME)
hostmaster.soco.net
Serial
2026100701
Refresh / retry
7200 s / 900 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.as12759.de (212.16.224.5)2026100701
ns1.as12759.de (2a01:3d8:2:0:171c:53:1:1)2026100701
ns2.as12759.de (212.16.238.252)2026100701
ns2.as12759.de (2a01:3d8:2:100:171c:53:1:1)2026100701
ns3.as12759.de (20.199.10.217)2026100701

Checks

  • ✓ Serial 2026100701 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.as12759.de is one of the listed nameservers.
  • ✓ Contact hostmaster@soco.net #25
    The SOA RNAME hostmaster.soco.net means hostmaster@soco.net.
  • ✓ Date-based serial #26
    The serial 2026100701 follows the YYYYMMDDnn convention (2026-10-07).

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

14 records at the apex

Found

Read from
212.16.224.5:53
TypeValueTTL
SOAns1.as12759.de. hostmaster.soco.net. 2026100701 7200 900 604800 864003600
NSns3.as12759.de.3600
NSns1.as12759.de.3600
NSns2.as12759.de.3600
A85.10.213.533600
AAAA2a01:4f8:d0a:2580::23600
MX10 mail12.regioit-aachen.de.3600
MX10 mail10.regioit-aachen.de.3600
MX10 mail11.regioit-aachen.de.3600
TXT"MS=10CA8C3DD22DCD92260A7283384BADA24873F92D"3600
TXT"apple-domain-verification=dgloXDggu3dTomYJ"3600
TXT"v=spf1 mx a ip4:212.16.238.16/32 ip4:212.16.238.17/32 ip4:212.16.238.79/32 ip4:85.10.213.53/32 include:_se_net.axiell.com include:spf.protection.outlook.com ~all"3600
TXT"335dc16cb6533369287de2043f95497ad71c778ca849a9de9fa67bbb3ae9201"3600
TXT"_67ud8zu3t7z24rqkr2608kyu83kcuge"3600

Checks

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