fona.de

Checked 21 October 2026, 22:30 UTC · via 8.8.8.8
!Passed with warnings
15 passed 5 warnings 0 failed 9 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

ns1.net-server.de, ns2.net-server.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.net-server.de, ns2.net-server.de
NS in the zone
pri-h2015.nbgo.de, sec-dns01.nbgo.de
NameserverAddressesNetwork (AS)Glue
ns1.net-server.de (parent only)87.237.124.6 2a02:420:0:3::3AS38927 NETBUILD-AS - Net-Build GmbH, DE AS38927 NETBUILD-AS - Net-Build GmbH, DE87.237.124.6
ns2.net-server.de (parent only)87.237.127.6 2a02:420:0:5::3AS38927 NETBUILD-AS - Net-Build GmbH, DE AS38927 NETBUILD-AS - Net-Build GmbH, DE87.237.127.6
pri-h2015.nbgo.de (zone only)185.146.238.79 2a02:420:0:8::900AS38927 NETBUILD-AS - Net-Build GmbH, DE AS38927 NETBUILD-AS - Net-Build GmbH, DE-
sec-dns01.nbgo.de (zone only)185.146.238.254 2a02:420:0:10::2AS38927 NETBUILD-AS - Net-Build GmbH, DE AS38927 NETBUILD-AS - Net-Build GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.net-server.de, ns2.net-server.de.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns1.net-server.de, ns2.net-server.de; only in the zone: pri-h2015.nbgo.de, sec-dns01.nbgo.de. ns1.net-server.de, ns2.net-server.de, pri-h2015.nbgo.de, sec-dns01.nbgo.de report NS pri-h2015.nbgo.de sec-dns01.nbgo.de.
    #7
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns1.net-server.de (glue 87.237.124.6, zone 87.237.124.6, 2a02:420:0:3::3); ns2.net-server.de (glue 87.237.127.6, zone 87.237.127.6, 2a02:420:0:5::3). Update the glue at your registrar.
    #8
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2a02:420::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS38927 (NETBUILD-AS - Net-Build GmbH, DE): 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 .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

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.net-server.de 87.237.124.6NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns1.net-server.de 2a02:420:0:3::3NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns2.net-server.de 87.237.127.6NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns2.net-server.de 2a02:420:0:5::3NOERROR, 8 ms, authoritativenoyes / yesrefused-
pri-h2015.nbgo.de 185.146.238.79NOERROR, 9 ms, authoritativenoyes / yesrefusednone
pri-h2015.nbgo.de 2a02:420:0:8::900NOERROR, 13 ms, authoritativenoyes / yesrefusednone
sec-dns01.nbgo.de 185.146.238.254NOERROR, 9 ms, authoritativenoyes / yesrefused9.16.23-RH
sec-dns01.nbgo.de 2a02:420:0:10::2NOERROR, 9 ms, authoritativenoyes / yesrefused9.16.23-RH

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: sec-dns01.nbgo.de: "9.16.23-RH". 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 2026061702 · primary dns01.nbgo.de

Found

Primary (MNAME)
dns01.nbgo.de
Contact (RNAME)
mail.net-server.de
Serial
2026061702
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.net-server.de (87.237.124.6)2026061702
ns1.net-server.de (2a02:420:0:3::3)2026061702
ns2.net-server.de (87.237.127.6)2026061702
ns2.net-server.de (2a02:420:0:5::3)2026061702
pri-h2015.nbgo.de (185.146.238.79)2026101401
pri-h2015.nbgo.de (2a02:420:0:8::900)2026101401
sec-dns01.nbgo.de (185.146.238.254)2026101401
sec-dns01.nbgo.de (2a02:420:0:10::2)2026101401

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2026061702 on ns1.net-server.de (87.237.124.6), ns1.net-server.de (2a02:420:0:3::3), ns2.net-server.de (87.237.127.6), ns2.net-server.de (2a02:420:0:5::3); 2026101401 on pri-h2015.nbgo.de (185.146.238.79), pri-h2015.nbgo.de (2a02:420:0:8::900), sec-dns01.nbgo.de (185.146.238.254), sec-dns01.nbgo.de (2a02:420:0:10::2). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • i
    Hidden master
    The primary nameserver dns01.nbgo.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact mail@net-server.de #25
    The SOA RNAME mail.net-server.de means mail@net-server.de.
  • ✓ Date-based serial #26
    The serial 2026061702 follows the YYYYMMDDnn convention (2026-06-17).

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

6 records at the apex

Found

Read from
87.237.124.6:53
TypeValueTTL
SOAdns01.nbgo.de. mail.net-server.de. 2026061702 10800 3600 604800 864003600
NSsec-dns01.nbgo.de.3600
NSpri-h2015.nbgo.de.3600
A185.146.238.793600
MX0 mail.fona.de.3600
TXT"v=spf1 a mx ip4:212.25.15.196 ~all"86400

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.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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