arber.de

Checked 21 October 2026, 21:30 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

warn

dns.cyber-stack.com, dns.cyber-stack.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.cyber-stack.com, dns.cyber-stack.de
NS in the zone
dns.cyber-stack.com, dns.cyber-stack.de
NameserverAddressesNetwork (AS)Glue
dns.cyber-stack.com3.126.36.110AS16509 AMAZON-02 - Amazon.com, Inc., US-
dns.cyber-stack.de62.146.186.35AS15598 IPX-AS15598 - NorthC Deutschland GmbH, DE62.146.186.35

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns.cyber-stack.com, dns.cyber-stack.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 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15598 (IPX-AS15598 - NorthC Deutschland GmbH, DE): 1 address; AS16509 (AMAZON-02 - Amazon.com, Inc., US): 1 address.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .de.
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.cyber-stack.com 3.126.36.110NOERROR, 4 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:39 by root@localhost)
dns.cyber-stack.de 62.146.186.35NOERROR, 2 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:39 by root@localhost)

Checks

  • ✓ All respond #14
    All 2 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: dns.cyber-stack.com: "PowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:39 by root@localhost)"; dns.cyber-stack.de: "PowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:39 by root@localhost)". 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 2026041401 · primary dns.cyber-stack.de

Found

Primary (MNAME)
dns.cyber-stack.de
Contact (RNAME)
hostmaster.cyberstack.de
Serial
2026041401
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns.cyber-stack.com (3.126.36.110)2026041401
dns.cyber-stack.de (62.146.186.35)2026041401

Checks

  • ✓ Serial 2026041401 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 dns.cyber-stack.de is one of the listed nameservers.
  • ✓ Contact hostmaster@cyberstack.de #25
    The SOA RNAME hostmaster.cyberstack.de means hostmaster@cyberstack.de.
  • ✓ Date-based serial #26
    The serial 2026041401 follows the YYYYMMDDnn convention (2026-04-14).

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

8 records at the apex

Found

Read from
3.126.36.110:53
TypeValueTTL
SOAdns.cyber-stack.de. hostmaster.cyberstack.de. 2026041401 14400 3600 604800 864003600
NSdns.cyber-stack.de.3600
NSdns.cyber-stack.com.3600
A62.146.186.2363600
MX10 mail.mailfusion.de.3600
TXT"google-site-verification=VLetxJS8uTf7yIZ_sBXszf8UyuQpBzCd-8Qd128Ayp0"300
TXT"v=spf1 include:spf.mailfusion.de mx -all"300
TXT""300

Checks

  • ✓ TTLs within range #32
    TTLs: A 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