rheinwerk-verlag.de

Checked 22 October 2026, 00:00 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

ns3.ip-projects.de, ns4.ip-projects.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns3.ip-projects.de, ns4.ip-projects.de
NS in the zone
ns3.ip-projects.de, ns4.ip-projects.de
NameserverAddressesNetwork (AS)Glue
ns3.ip-projects.de217.160.80.161 2001:8d8:fe:53:217:160:80:161AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE217.160.80.161 2001:8d8:fe:53:217:160:80:161
ns4.ip-projects.de217.160.81.161 2001:8d8:fe:53:217:160:81:161AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE217.160.81.161 2001:8d8:fe:53:217:160:81:161

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns3.ip-projects.de, ns4.ip-projects.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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:8d8:fe::/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 (AS8560 (IONOS-AS - IONOS SE, 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
ns3.ip-projects.de 217.160.80.161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns3.ip-projects.de 2001:8d8:fe:53:217:160:80:161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.ip-projects.de 217.160.81.161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.ip-projects.de 2001:8d8:fe:53:217:160:81:161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

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: ns3.ip-projects.de: "Served by PowerDNS - https://www.powerdns.com/"; ns4.ip-projects.de: "Served by PowerDNS - https://www.powerdns.com/".
    #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 2025091614 · primary ns3.ip-projects.de

Found

Primary (MNAME)
ns3.ip-projects.de
Contact (RNAME)
hostmaster.rheinwerk-verlag.de
Serial
2025091614
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns3.ip-projects.de (217.160.80.161)2025091614
ns3.ip-projects.de (2001:8d8:fe:53:217:160:80:161)2025091614
ns4.ip-projects.de (217.160.81.161)2025091614
ns4.ip-projects.de (2001:8d8:fe:53:217:160:81:161)2025091614

Checks

  • ✓ Serial 2025091614 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns3.ip-projects.de is one of the listed nameservers.
  • ✓ Contact hostmaster@rheinwerk-verlag.de #25
    The SOA RNAME hostmaster.rheinwerk-verlag.de means hostmaster@rheinwerk-verlag.de.
  • ✓ Date-based serial #26
    The serial 2025091614 follows the YYYYMMDDnn convention (2025-09-16).

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

12 records at the apex

Found

Read from
217.160.80.161:53
TypeValueTTL
SOAns3.ip-projects.de. hostmaster.rheinwerk-verlag.de. 2025091614 43200 7200 1209600 8640086400
NSns3.ip-projects.de.86400
NSns4.ip-projects.de.86400
A103.241.48.33600
MX20 mx3.heinlein-support.de.600
MX100 mail.rheinwerk-verlag.de.600
MX10 mx2.heinlein-support.de.600
MX10 mx1.heinlein-support.de.600
TXT"google-site-verification=NgTl7vtn68KKZlM8iypalh1ORtzFB8P8Gj77OEVrkQQ"3600
TXT"google-site-verification=U8_Pnh4BaOaKVat2r-tAEeqx3IQsGPF8oWUuSRn8X_o"3600
TXT"v=spf1 ip4:103.241.48.0/26 ip4:194.8.219.19/29 include:spf.servicemail24.de -all"3600
TXT"MS=ms64086730"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 10m, NS 1d.
  • ✓ 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