voelkner.de

Checked 22 October 2026, 01:00 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

a1-56.akam.net, a13-66.akam.net, a16-67.akam.net, a24-65.akam.net, a5-66.akam.net, a8-64.akam.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a1-56.akam.net, a13-66.akam.net, a16-67.akam.net, a24-65.akam.net, a5-66.akam.net, a8-64.akam.net
NS in the zone
a1-56.akam.net, a13-66.akam.net, a16-67.akam.net, a24-65.akam.net, a5-66.akam.net, a8-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-56.akam.net193.108.91.56 2600:1401:2::38AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-66.akam.net2.22.230.66 2600:1480:800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a16-67.akam.net23.211.132.67 2600:1406:1b::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a24-65.akam.net2.16.130.65 2600:1480:9800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-66.akam.net95.100.168.66 2600:1480:b000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a8-64.akam.net2.16.40.64 2600:1403:a::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-56.akam.net, a13-66.akam.net, a16-67.akam.net, a24-65.akam.net, a5-66.akam.net, a8-64.akam.net.
  • ✓ 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 6 IPv4 /24s and 6 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 12 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 .net
    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

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-56.akam.net 193.108.91.56NOERROR, 3 ms, authoritativenoyes / yesrefused41824.9
a1-56.akam.net 2600:1401:2::38NOERROR, 3 ms, authoritativenoyes / yesrefused41824.11
a13-66.akam.net 2.22.230.66NOERROR, 6 ms, authoritativenoyes / yesrefused41824.11
a13-66.akam.net 2600:1480:800::42NOERROR, 5 ms, authoritativenoyes / yesrefused41824.5
a16-67.akam.net 23.211.132.67NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
a16-67.akam.net 2600:1406:1b::43NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a24-65.akam.net 2.16.130.65NOERROR, 5 ms, authoritativenoyes / yesrefused48878.31
a24-65.akam.net 2600:1480:9800::41NOERROR, 6 ms, authoritativenoyes / yesrefused48878.32
a5-66.akam.net 95.100.168.66NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a5-66.akam.net 2600:1480:b000::42NOERROR, 5 ms, authoritativenoyes / yesrefused41824.5
a8-64.akam.net 2.16.40.64NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
a8-64.akam.net 2600:1403:a::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31

Checks

  • ✓ All respond #14
    All 12 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: a1-56.akam.net: "41824.9"; a1-56.akam.net: "41824.11"; a13-66.akam.net: "41824.11"; a13-66.akam.net: "41824.5"; a16-67.akam.net: "48878.31"; a16-67.akam.net: "48878.33"; a24-65.akam.net: "48878.31"; a24-65.akam.net: "48878.32"; a5-66.akam.net: "41824.9"; a5-66.akam.net: "41824.5"; a8-64.akam.net: "48878.31". 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 2733111442 · primary a1-56.akam.net

Found

Primary (MNAME)
a1-56.akam.net
Contact (RNAME)
7x24.re-in.de
Serial
2733111442
Refresh / retry
16384 s / 2048 s
Expire
1048576 s
Negative TTL
2560 s

Serial per nameserver

NameserverSerial
a1-56.akam.net (193.108.91.56)2733111442
a1-56.akam.net (2600:1401:2::38)2733111442
a13-66.akam.net (2.22.230.66)2733111442
a13-66.akam.net (2600:1480:800::42)2733111442
a16-67.akam.net (23.211.132.67)2733111442
a16-67.akam.net (2600:1406:1b::43)2733111442
a24-65.akam.net (2.16.130.65)2733111442
a24-65.akam.net (2600:1480:9800::41)2733111442
a5-66.akam.net (95.100.168.66)2733111442
a5-66.akam.net (2600:1480:b000::42)2733111442
a8-64.akam.net (2.16.40.64)2733111442
a8-64.akam.net (2600:1403:a::40)2733111442

Checks

  • ✓ Serial 2733111442 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h33m4s, retry 34m8s, expire 291h16m16s, negative TTL 42m40s.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-56.akam.net is one of the listed nameservers.
  • ✓ Contact 7x24@re-in.de #25
    The SOA RNAME 7x24.re-in.de means 7x24@re-in.de.
  • ✓ Timestamp serial #26
    The serial 2733111442 is a Unix timestamp (2056-08-10 05:37 UTC).

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

warn

26 records at the apex

Found

Read from
193.108.91.56:53
TypeValueTTL
SOAa1-56.akam.net. 7x24.re-in.de. 2733111442 16384 2048 1048576 256038400
NSa8-64.akam.net.300
NSa5-66.akam.net.300
NSa16-67.akam.net.300
NSa24-65.akam.net.300
NSa13-66.akam.net.300
NSa1-56.akam.net.300
A2.16.204.7220
A2.16.204.9720
AAAA2a02:26f0:b700:5::210:cc0a20
AAAA2a02:26f0:b700:5::210:cc1020
MX1 alt4.aspmx.l.google.com.300
MX5 alt2.aspmx.l.google.com.300
MX1 aspmx.l.google.com.300
MX5 alt1.aspmx.l.google.com.300
MX10 alt3.aspmx.l.google.com.300
TXT"google-site-verification=ZnVgbBE5Ws2fv7NlLiaBXuJRJ_G3wjpcMPyuhIwr_6s"300
TXT"google-site-verification=yW6ThW9dU4NadHDmDDXb-KifGVajYh89LpDZx58TyT4"300
TXT"v=spf1 include:_spf.re-in.de include:_spf.google.com include:mail.zendesk.com ~all"300
TXT"facebook-domain-verification=av522ojlm7nd0zftm0kxlebb2n850x"300
TXT"google-site-verification=FAhQk2gskF_b3Wz1nRGgIwHZjVLNjQq6LnvLknBp7F8"300
CAA0 issuewild "letsencrypt.org"1800
CAA0 iodef "mailto:wdo.devops.infra@re-in.de"1800
CAA0 issuewild "www.digicert.com"1800
CAA0 issue "letsencrypt.org"1800
CAA0 issue "www.digicert.com"1800

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 5m; resolvers may use either.
    #32
  • ✓ 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, www.digicert.com.