dwds.de

Checked 21 October 2026, 22:15 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 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

info

hippo.bbaw.de, ns17.knipp.net, ns3.knipp.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
hippo.bbaw.de, ns17.knipp.net, ns3.knipp.de
NS in the zone
hippo.bbaw.de, ns17.knipp.net, ns3.knipp.de
NameserverAddressesNetwork (AS)Glue
hippo.bbaw.de194.95.188.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.95.188.1
ns17.knipp.net195.253.51.61 2a01:5b0:2:56::3dAS48519 KNIPP-AMS-AS - Knipp Medien und Kommunikation GmbH, DE AS48519 KNIPP-AMS-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

  • ✓ 3 nameservers #6
    Delegated to hippo.bbaw.de, ns17.knipp.net, ns3.knipp.de.
  • ✓ 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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS48519 (KNIPP-AMS-AS - Knipp Medien und Kommunikation GmbH, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 1 address; AS8391 (KNIPP-AS - Knipp Medien und Kommunikation GmbH, 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: hippo.bbaw.de.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
hippo.bbaw.de 194.95.188.1NOERROR, 13 ms, authoritativenoyes / yesrefused9.9.5-3ubuntu0.19-Ubuntu
ns17.knipp.net 195.253.51.61NOERROR, 35 ms, authoritativenoyes / yesrefused-
ns17.knipp.net 2a01:5b0:2:56::3dNOERROR, 14 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 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: hippo.bbaw.de: "9.9.5-3ubuntu0.19-Ubuntu". Hide or replace the version string.
    #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 2026032002 · primary hippo.bbaw.de

Found

Primary (MNAME)
hippo.bbaw.de
Contact (RNAME)
postmaster.bbaw.de
Serial
2026032002
Refresh / retry
28800 s / 7200 s
Expire
172800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
hippo.bbaw.de (194.95.188.1)2026032002
ns17.knipp.net (195.253.51.61)2026032002
ns17.knipp.net (2a01:5b0:2:56::3d)2026032002
ns3.knipp.de (195.253.113.3)2026032002
ns3.knipp.de (2a01:5b0:31::3)2026032002

Checks

  • ✓ Serial 2026032002 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 2d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 8h, retry 2h, expire 2d, negative TTL 1d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver hippo.bbaw.de is one of the listed nameservers.
  • ✓ Contact postmaster@bbaw.de #25
    The SOA RNAME postmaster.bbaw.de means postmaster@bbaw.de.
  • ✓ Date-based serial #26
    The serial 2026032002 follows the YYYYMMDDnn convention (2026-03-20).

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

9 records at the apex

Found

Read from
194.95.188.1:53
TypeValueTTL
SOAhippo.bbaw.de. postmaster.bbaw.de. 2026032002 28800 7200 172800 86400172800
NSns3.knipp.de.172800
NShippo.bbaw.de.172800
NSns17.knipp.net.172800
A194.95.188.49172800
MX10 c2021.mx.srv.dfn.de.172800
MX10 b2021.mx.srv.dfn.de.172800
MX10 a2021.mx.srv.dfn.de.172800
TXT"v=spf1 a:mx1.bbaw.de a:mx2.bbaw.de a:mx-gw2.bbaw.de ~ip4:194.95.188.0/24 -all"172800

Checks

  • ✓ TTLs within range #32
    TTLs: A 2d, MX 2d, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; 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