waermepumpe.de

Checked 22 October 2026, 01:00 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 4 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.dns-hotel.net, ns2.dns-hotel.net, ns3.dns-hotel.net, ns4.dns-hotel.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.dns-hotel.net, ns2.dns-hotel.net, ns3.dns-hotel.net, ns4.dns-hotel.net
NS in the zone
ns1.dns-hotel.net, ns2.dns-hotel.net, ns3.dns-hotel.net, ns4.dns-hotel.net
NameserverAddressesNetwork (AS)Glue
ns1.dns-hotel.net193.193.166.36AS203329 ESHELTER - NTT Global Data Centers EMEA GmbH, DE-
ns2.dns-hotel.net193.193.166.37AS203329 ESHELTER - NTT Global Data Centers EMEA GmbH, DE-
ns3.dns-hotel.net193.193.167.36AS203329 ESHELTER - NTT Global Data Centers EMEA GmbH, DE-
ns4.dns-hotel.net193.193.167.37AS203329 ESHELTER - NTT Global Data Centers EMEA GmbH, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.dns-hotel.net, ns2.dns-hotel.net, ns3.dns-hotel.net, ns4.dns-hotel.net.
  • ✓ 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 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS203329 (ESHELTER - NTT Global Data Centers EMEA GmbH, 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 .net
    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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dns-hotel.net 193.193.166.36NOERROR, 14 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.7.3
ns2.dns-hotel.net 193.193.166.37NOERROR, 16 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.7.3
ns3.dns-hotel.net 193.193.167.36NOERROR, 14 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.7.3
ns4.dns-hotel.net 193.193.167.37NOERROR, 14 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.7.3

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.dns-hotel.net: "PowerDNS Authoritative Server 4.7.3"; ns2.dns-hotel.net: "PowerDNS Authoritative Server 4.7.3"; ns3.dns-hotel.net: "PowerDNS Authoritative Server 4.7.3"; ns4.dns-hotel.net: "PowerDNS Authoritative Server 4.7.3". 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

pass

serial 2026101601 · primary ns1.dns-hotel.net

Found

Primary (MNAME)
ns1.dns-hotel.net
Contact (RNAME)
hm.bb-one.net
Serial
2026101601
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
38400 s

Serial per nameserver

NameserverSerial
ns1.dns-hotel.net (193.193.166.36)2026101601
ns2.dns-hotel.net (193.193.166.37)2026101601
ns3.dns-hotel.net (193.193.167.36)2026101601
ns4.dns-hotel.net (193.193.167.37)2026101601

Checks

  • ✓ Serial 2026101601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 640m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.dns-hotel.net is one of the listed nameservers.
  • ✓ Contact hm@bb-one.net #25
    The SOA RNAME hm.bb-one.net means hm@bb-one.net.
  • ✓ Date-based serial #26
    The serial 2026101601 follows the YYYYMMDDnn convention (2026-10-16).

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

pass

13 records at the apex

Found

Read from
193.193.166.36:53
TypeValueTTL
SOAns1.dns-hotel.net. hm.bb-one.net. 2026101601 10800 3600 604800 3840038400
NSns3.dns-hotel.net.38400
NSns1.dns-hotel.net.38400
NSns4.dns-hotel.net.38400
NSns2.dns-hotel.net.38400
A193.193.167.10338400
MX10 waermepumpe-de.mail.protection.outlook.com.38400
TXT"MS=ms34627683"38400
TXT"v=spf1 mx include:spf.mailjet.com include:spf.protection.outlook.com ~all"38400
TXT"dsfretgrgsfbgsht4htghgfh"38400
TXT"asv=66f86a3d7db2f0cc67e7d0a3358f9020"38400
CAA0 issue "letsencrypt.org"38400
CAA0 issue "comodoca.com"38400

Checks

  • ✓ TTLs within range #32
    TTLs: A 640m, MX 640m, NS 640m. The NS TTL at the parent is 1d and in the zone 640m; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org, comodoca.com.