akweb.de

Checked 21 October 2026, 21:28 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 0 failed 5 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

a.ns.oopen.de, b.ns.oopen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.ns.oopen.de, b.ns.oopen.de
NS in the zone
a.ns.oopen.de, b.ns.oopen.de
NameserverAddressesNetwork (AS)Glue
a.ns.oopen.de195.201.179.131 2a01:4f8:231:19a7::131AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE195.201.179.131 2a01:4f8:231:19a7::131
b.ns.oopen.de95.217.204.204 2a01:4f9:4a:47e5::204AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE95.217.204.204 2a01:4f9:4a:47e5::204

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: a.ns.oopen.de, b.ns.oopen.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 (AS24940 (HETZNER-AS - Hetzner Online 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

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.ns.oopen.de 195.201.179.131NOERROR, 4 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
a.ns.oopen.de 2a01:4f8:231:19a7::131NOERROR, 3 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
b.ns.oopen.de 95.217.204.204NOERROR, 24 ms, authoritativenoyes / yesrefusednot currently available
b.ns.oopen.de 2a01:4f9:4a:47e5::204NOERROR, 24 ms, authoritativenoyes / yesrefusednot currently available

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a.ns.oopen.de: "9.20.29-1~deb13u1-Debian". 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

pass

serial 2026070101 · primary a.ns.oopen.de

Found

Primary (MNAME)
a.ns.oopen.de
Contact (RNAME)
domreg.oopen.de
Serial
2026070101
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
a.ns.oopen.de (195.201.179.131)2026070101
a.ns.oopen.de (2a01:4f8:231:19a7::131)2026070101
b.ns.oopen.de (95.217.204.204)2026070101
b.ns.oopen.de (2a01:4f9:4a:47e5::204)2026070101

Checks

  • ✓ Serial 2026070101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.ns.oopen.de is one of the listed nameservers.
  • ✓ Contact domreg@oopen.de #25
    The SOA RNAME domreg.oopen.de means domreg@oopen.de.
  • ✓ Date-based serial #26
    The serial 2026070101 follows the YYYYMMDDnn convention (2026-07-01).

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

pass

10 records at the apex

Found

Read from
195.201.179.131:53
TypeValueTTL
SOAa.ns.oopen.de. domreg.oopen.de. 2026070101 14400 3600 604800 8640086400
NSb.ns.oopen.de.43200
NSa.ns.oopen.de.43200
A167.235.53.9043200
AAAA2a01:4f8:1c1e:cc89::343200
MX10 a.mx.oopen.de.43200
TXT"v=spf1 a mx mx:lists.oopen.de include:spf.mailjet.com ~all"3600
TXT"google-site-verification=HvQKZjhm646g04UXmgpE5dX0IjIDG8Z_uHGripX1H-s"3600
CAA0 issuewild "letsencrypt.org"43200
CAA0 issue "letsencrypt.org"43200

Checks

  • ✓ TTLs within range #32
    TTLs: A 12h, AAAA 12h, MX 12h, NS 12h. The NS TTL at the parent is 1d and in the zone 12h; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org.