ffn.de

Checked 21 October 2026, 22:20 UTC · via 8.8.8.8
!Passed with warnings
19 passed 4 warnings 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

warn

pns01.dcsix.net, pns02.dcsix.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
pns01.dcsix.net, pns02.dcsix.net
NS in the zone
pns01.kyberio-dns.com, pns02.kyberio-dns.de
NameserverAddressesNetwork (AS)Glue
pns01.dcsix.net (parent only)192.174.68.13 2001:67c:1bc::13AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
pns01.kyberio-dns.com (zone only)192.174.68.13 2001:67c:1bc::13AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
pns02.dcsix.net (parent only)176.97.158.13 2001:67c:10b8::13AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
pns02.kyberio-dns.de (zone only)176.97.158.13 2001:67c:10b8::13AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: pns01.dcsix.net, pns02.dcsix.net.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: pns01.dcsix.net, pns02.dcsix.net; only in the zone: pns01.kyberio-dns.com, pns02.kyberio-dns.de. pns01.dcsix.net, pns01.kyberio-dns.com, pns02.dcsix.net, pns02.kyberio-dns.de report NS pns01.kyberio-dns.com pns02.kyberio-dns.de.
    #7
  • ✓ 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 (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 8 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

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pns01.dcsix.net 192.174.68.13NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
pns01.dcsix.net 2001:67c:1bc::13NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
pns01.kyberio-dns.com 192.174.68.13NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
pns01.kyberio-dns.com 2001:67c:1bc::13NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
pns02.dcsix.net 176.97.158.13NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
pns02.dcsix.net 2001:67c:10b8::13NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
pns02.kyberio-dns.de 176.97.158.13NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
pns02.kyberio-dns.de 2001:67c:10b8::13NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1

Checks

  • ✓ All respond #14
    All 8 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: pns01.dcsix.net: "RcodeZero DNS"; pns01.kyberio-dns.com: "RcodeZero DNS"; pns02.dcsix.net: "reg-wie1"; pns02.kyberio-dns.de: "reg-wie1".
    #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 2026091002 · primary pns01.kyberio-dns.com

Found

Primary (MNAME)
pns01.kyberio-dns.com
Contact (RNAME)
hostmaster.kyberio-dns.com
Serial
2026091002
Refresh / retry
14400 s / 604800 s
Expire
3600 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
pns01.dcsix.net (192.174.68.13)2026091002
pns01.dcsix.net (2001:67c:1bc::13)2026091002
pns01.kyberio-dns.com (192.174.68.13)2026091002
pns01.kyberio-dns.com (2001:67c:1bc::13)2026091002
pns02.dcsix.net (176.97.158.13)2026091002
pns02.dcsix.net (2001:67c:10b8::13)2026091002
pns02.kyberio-dns.de (176.97.158.13)2026091002
pns02.kyberio-dns.de (2001:67c:10b8::13)2026091002

Checks

  • ✓ Serial 2026091002 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 7d should be shorter than refresh 4h; expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry; negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 4h, retry 7d, expire 1h, negative TTL 1m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver pns01.kyberio-dns.com is one of the listed nameservers.
  • ✓ Contact hostmaster@kyberio-dns.com #25
    The SOA RNAME hostmaster.kyberio-dns.com means hostmaster@kyberio-dns.com.
  • ✓ Date-based serial #26
    The serial 2026091002 follows the YYYYMMDDnn convention (2026-09-10).

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

12 records at the apex

Found

Read from
192.174.68.13:53
TypeValueTTL
SOApns01.kyberio-dns.com. hostmaster.kyberio-dns.com. 2026091002 14400 604800 3600 6060
NSpns01.kyberio-dns.com.60
NSpns02.kyberio-dns.de.60
A185.148.170.2060
MX100 mx1.hc1820-79.eu.iphmx.com.60
MX200 mx2.hc1820-79.eu.iphmx.com.60
TXT"MS=ms11617897"300
TXT"google-site-verification=faRVKhJ5oXciLIoysgV0HR3sVHk57dRDYr_IGqMGW8g"300
TXT"_globalsign-domain-verification=JKlbh6PEhiLSPJYioacmFZAweQDR2sZBnKheTFyBba"300
TXT"v=spf1 a ip4:195.149.93.48/32 ip4:194.25.33.19/32 ip4:194.25.33.20/32 ip4:194.25.33.22/32 ip4:185.148.170.21/32 ip4:185.148.170.118/32 include:spf.protection.outlook.com include:_spf.salesforce.com exists:%{i}.spf.hc1820-79.eu.iphmx.com include:amazonses." "com -all"300
CAA0 issue "globalsign.com"3600
CAA0 issue "letsencrypt.org"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m), NS (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1m; 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: globalsign.com, letsencrypt.org.