arminia.de

Checked 21 October 2026, 21:30 UTC · via 8.8.8.8
!Passed with warnings
19 passed 2 warnings 0 failed 8 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

linbicos.bicos.de, ns3.bicos.de, ns4.bicos.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
linbicos.bicos.de, ns3.bicos.de, ns4.bicos.de
NS in the zone
linbicos.bicos.de, ns3.bicos.de, ns4.bicos.de
NameserverAddressesNetwork (AS)Glue
linbicos.bicos.de212.100.32.1 2a00:d58::212:100:32:1 2a00:d58::1AS12466 BICOS - Bicos Computer GmbH, DE AS12466 BICOS - Bicos Computer GmbH, DE AS12466 BICOS - Bicos Computer GmbH, DE212.100.32.1 2a00:d58::1 2a00:d58::212:100:32:1
ns3.bicos.de193.24.2.222 2a00:d58::5AS12466 BICOS - Bicos Computer GmbH, DE AS12466 BICOS - Bicos Computer GmbH, DE193.24.2.222 2a00:d58::5
ns4.bicos.de195.4.173.228AS60175 WAG - Wortmann AG, DE195.4.173.228

Checks

  • ✓ 3 nameservers #6
    Delegated to linbicos.bicos.de, ns3.bicos.de, ns4.bicos.de.
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2a00:d58::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12466 (BICOS - Bicos Computer GmbH, DE): 5 addresses; AS60175 (WAG - Wortmann AG, DE): 1 address.
  • 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns4.bicos.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
linbicos.bicos.de 212.100.32.1NOERROR, 10 ms, authoritativenoyes / yesrefusedBind
linbicos.bicos.de 2a00:d58::212:100:32:1NOERROR, 11 ms, authoritativenoyes / yesrefused-
linbicos.bicos.de 2a00:d58::1NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns3.bicos.de 193.24.2.222NOERROR, 10 ms, authoritativenoyes / yesrefusedBind
ns3.bicos.de 2a00:d58::5NOERROR, 13 ms, authoritativenoyes / yesrefusedBind
ns4.bicos.de 195.4.173.228NOERROR, 13 ms, authoritativenoyes / yesrefusedBind

Checks

  • ✓ All respond #14
    All 6 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: linbicos.bicos.de: "Bind"; ns3.bicos.de: "Bind"; ns4.bicos.de: "Bind".
    #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 2026102105 · primary linbicos.bicos.de

Found

Primary (MNAME)
linbicos.bicos.de
Contact (RNAME)
root.linbicos.bicos.de
Serial
2026102105
Refresh / retry
28800 s / 7200 s
Expire
3600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
linbicos.bicos.de (212.100.32.1)2026102105
linbicos.bicos.de (2a00:d58::212:100:32:1)2026102105
linbicos.bicos.de (2a00:d58::1)2026102105
ns3.bicos.de (193.24.2.222)2026102105
ns3.bicos.de (2a00:d58::5)2026102105
ns4.bicos.de (195.4.173.228)2026102105

Checks

  • ✓ Serial 2026102105 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 8h, retry 2h, expire 1h, negative TTL 1d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver linbicos.bicos.de is one of the listed nameservers.
  • ✓ Contact root@linbicos.bicos.de #25
    The SOA RNAME root.linbicos.bicos.de means root@linbicos.bicos.de.
  • ✓ Date-based serial #26
    The serial 2026102105 follows the YYYYMMDDnn convention (2026-10-21).

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

14 records at the apex

Found

Read from
212.100.32.1:53
TypeValueTTL
SOAlinbicos.bicos.de. root.linbicos.bicos.de. 2026102105 28800 7200 3600 8640086400
NSlinbicos.bicos.de.86400
NSns4.bicos.de.86400
NSns3.bicos.de.86400
A185.233.55.77300
MX20 mx02.hornetsecurity.com.86400
MX10 mx01.hornetsecurity.com.86400
MX40 mx04.hornetsecurity.com.86400
MX30 mx03.hornetsecurity.com.86400
TXT"apple-domain-verification=xFzqeBWwKy9in4cT"86400
TXT"openai-domain-verification=dv-SPvfwzm6UdcsmwYlr3Bl58rt"86400
TXT"MS=ms88401496"86400
TXT"v=spf1 a a:mx4.eventim.de include:spf.protection.outlook.com include:spf.hornetsecurity.com include:spf.crsend.com include:spf.talention.com -all"86400
TXT"sophos-domain-verification=8872ee4e47b4c62b5e0ff83cd39a220c0569b3bf81fb3004a1184e9e68245c3b"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1d, NS 1d.
  • ✓ 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