jung.de

Checked 21 October 2026, 23:01 UTC · via 8.8.8.8
!Passed with warnings
22 passed 1 warning 0 failed 6 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

info

ns2.knipp.de, ns3.knipp.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns2.knipp.de, ns3.knipp.de
NS in the zone
ns2.knipp.de, ns3.knipp.de
NameserverAddressesNetwork (AS)Glue
ns2.knipp.de195.253.6.52 2a01:5b0:0:29::34AS8391 KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE AS8391 KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE-
ns3.knipp.de195.253.113.3 2a01:5b0:31::3AS8391 KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE AS8391 KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns2.knipp.de, ns3.knipp.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 different networks #10
    The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS8391 (KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE): 4 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns2.knipp.de 195.253.6.52NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns2.knipp.de 2a01:5b0:0:29::34NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns3.knipp.de 195.253.113.3NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns3.knipp.de 2a01:5b0:31::3NOERROR, 10 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2024042477 · primary ns2.knipp.de

Found

Primary (MNAME)
ns2.knipp.de
Contact (RNAME)
dnsmaster.irondns.net
Serial
2024042477
Refresh / retry
10800 s / 3000 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns2.knipp.de (195.253.6.52)2024042477
ns2.knipp.de (2a01:5b0:0:29::34)2024042477
ns3.knipp.de (195.253.113.3)2024042477
ns3.knipp.de (2a01:5b0:31::3)2024042477

Checks

  • ✓ Serial 2024042477 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 50m, expire 28d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns2.knipp.de is one of the listed nameservers.
  • ✓ Contact dnsmaster@irondns.net #25
    The SOA RNAME dnsmaster.irondns.net means dnsmaster@irondns.net.
  • ✓ Date-based serial #26
    The serial 2024042477 follows the YYYYMMDDnn convention (2024-04-24).

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
195.253.6.52:53
TypeValueTTL
SOAns2.knipp.de. dnsmaster.irondns.net. 2024042477 10800 3000 2419200 90086400
NSns3.knipp.de.86400
NSns2.knipp.de.86400
A151.106.71.893600
MX10 mail3.jung.de.3600
TXT"mindmanager-verification=998ecf9a49185534168ebaf812e3e2cd000330b79bf8c0da0cc0db662bd93762"60
TXT"v=spf1 mx ip4:217.89.186.229 ip4:151.106.71.84 include:_spf.senders.scnem.com include:spf.protection.outlook.com include:spf.eu.exclaimer.net include:spf.sendinblue.com ~all"60
TXT"google-site-verification=RJEkgKTYBf-lmBwg603ZjW-_iV9mrlSYBbeaPJFZXdo"60
TXT"atlassian-sending-domain-verification=fcc3ddf2-3406-4391-9b7e-72d50c3965c7"60
TXT"MS=ms70811723"60
TXT"zone-ownership-verification-d01553d21b863dd1bfa74b82e8b59c67702304e69de892f6ee25894a6e61e2f5"60
TXT"atlassian-domain-verification=PO//HTt/ZT2lQImdbleFgWbeeweMvhbhhWdlAb3/cMFcsDa3r2AQnaztap83Iol1"60
TXT"brevo-code:5de5d77e1c1f810044662ee4dd8fdb63"60
TXT"apple-domain-verification=NaIDaLqopo88wmAp"60

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1h, 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