kosmos.de

Checked 21 October 2026, 23:10 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 failed 7 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

ns.plusline.de, ns.s.plusline.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.plusline.de, ns.s.plusline.de
NS in the zone
ns.plusline.de, ns.s.plusline.de
NameserverAddressesNetwork (AS)Glue
ns.plusline.de212.19.48.14 2a02:2e0:1:2:3:4:5:6AS12306 PLUSLINE - Plus.line AG, DE AS12306 PLUSLINE - Plus.line AG, DE212.19.48.14 2a02:2e0:1:2:3:4:5:6
ns.s.plusline.de212.19.40.14 2a02:2e0:a:b:c:d:e:fAS12306 PLUSLINE - Plus.line AG, DE AS12306 PLUSLINE - Plus.line AG, DE212.19.40.14 2a02:2e0:a:b:c:d:e:f

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.plusline.de, ns.s.plusline.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 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS12306 (PLUSLINE - Plus.line AG, DE): 4 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

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.plusline.de 212.19.48.14NOERROR, 4 ms, authoritativenoyes / yesrefusednameserver
ns.plusline.de 2a02:2e0:1:2:3:4:5:6NOERROR, 4 ms, authoritativenoyes / yesrefusednameserver
ns.s.plusline.de 212.19.40.14NOERROR, 3 ms, authoritativenoyes / yesrefusednameserver
ns.s.plusline.de 2a02:2e0:a:b:c:d:e:fNOERROR, 4 ms, authoritativenoyes / yesrefusednameserver

Checks

  • ✓ All respond #14
    All 4 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: ns.plusline.de: "nameserver"; ns.s.plusline.de: "nameserver".
    #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 2026090702 · primary ns.plusline.de

Found

Primary (MNAME)
ns.plusline.de
Contact (RNAME)
hostmaster.plusline.de
Serial
2026090702
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns.plusline.de (212.19.48.14)2026090702
ns.plusline.de (2a02:2e0:1:2:3:4:5:6)2026090702
ns.s.plusline.de (212.19.40.14)2026090702
ns.s.plusline.de (2a02:2e0:a:b:c:d:e:f)2026090702

Checks

  • ✓ Serial 2026090702 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.plusline.de is one of the listed nameservers.
  • ✓ Contact hostmaster@plusline.de #25
    The SOA RNAME hostmaster.plusline.de means hostmaster@plusline.de.
  • ✓ Date-based serial #26
    The serial 2026090702 follows the YYYYMMDDnn convention (2026-09-07).

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

19 records at the apex

Found

Read from
212.19.48.14:53
TypeValueTTL
SOAns.plusline.de. hostmaster.plusline.de. 2026090702 10800 3600 604800 300300
NSns.s.plusline.de.300
NSns.plusline.de.300
A23.227.38.65300
MX10 mx2-eu1.ppe-hosted.com.300
MX10 mx1-eu1.ppe-hosted.com.300
TXT"myedi-site-verification=mihQKsUgiVPUPXA522x5"300
TXT"pardot1098532=9e922bf7735b29d0b9ade4ac02a14c23f11c727ccb7956e78f79a4ebffc852f3"300
TXT"v=spf1 ip4:82.165.231.22 ip4:82.165.237.87 a:dispatch-eu.ppe-hosted.com include:spf.protection.outlook.com include:_spf.salesforce.com include:mail.zendesk.com include:servicemail24.de include:spf.local.usm.de ~all"300
TXT"00D9V00000TdZIA=1TB9V0000000cDN"300
TXT"atlassian-domain-verification=F72kYry4YjUdzHGAIZb6NX6vv8OV92AK6J7F0vmq3GfK0IBHtaJtpbI9Qo2EIKkl"300
TXT"google-site-verification=ItSktUcAEcM5qvDrDGDZwHqCYNk7UYn1wFFmZDRZJHw"300
TXT"google-site-verification=XYmtoD3azW5fhhHS3gOqeI-7cT6Ob3HE1C1gUtdfqLo"300
TXT"sending_domain1098532=16d0538089fd88b9ef187dcb2fa030822a571e15c4b11f50614e57cb4eb40823"300
TXT"adobe-idp-site-verification=19292f1cb72f944275ae30f7c6eb43d923ada3e36938936327cc88e3b6c9404e"300
TXT"Shopify-verification-code=QkTMVix6iE3kXTGcSKs0ZtZKCa6Hrj"300
TXT"apple-domain-verification=7deV8d96EQ2Lr4JI"300
TXT"F72kYry4YjUdzHGAIZb6NX6vv8OV92AK6J7F0vmq3GfK0IBHtaJtpbI9Qo2EIKk"300
TXT"facebook-domain-verification=s33l3wza521prqvh0wm62lrrdjb8qj"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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