ruw.de

Checked 22 October 2026, 00:01 UTC · via 8.8.8.8
!Passed with warnings
20 passed 1 warning 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

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, 4 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 2026092201 · primary ns.plusline.de

Found

Primary (MNAME)
ns.plusline.de
Contact (RNAME)
hostmaster.plusline.de
Serial
2026092201
Refresh / retry
10800 s / 300 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns.plusline.de (212.19.48.14)2026092201
ns.plusline.de (2a02:2e0:1:2:3:4:5:6)2026092201
ns.s.plusline.de (212.19.40.14)2026092201
ns.s.plusline.de (2a02:2e0:a:b:c:d:e:f)2026092201

Checks

  • ✓ Serial 2026092201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 5m, 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 2026092201 follows the YYYYMMDDnn convention (2026-09-22).

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

7 records at the apex

Found

Read from
212.19.48.14:53
TypeValueTTL
SOAns.plusline.de. hostmaster.plusline.de. 2026092201 10800 300 604800 300300
NSns.plusline.de.300
NSns.s.plusline.de.300
A185.11.255.73300
MX10 mx3-redirect.dfv-is.de.300
TXT"Sendinblue-code:2990bc993700b9eb2c63a1fff92cfff2"300
TXT"v=spf1 include:spf.sendinblue.com include:_spf.pretix.eu mx ip4:185.11.255.200 ip4:185.11.255.73 ip4:185.11.255.73 ip4:91.204.45.111 ip4:46.232.250.4 ip4:185.233.188.29 ip4:185.233.188.29 ip4:185.233.188.231 -all"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.
  • 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