weltderphysik.de

Checked 22 October 2026, 01:00 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

ns1.is-fun.net, ns2.is-fun.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.is-fun.net, ns2.is-fun.net
NS in the zone
ns1.is-fun.net, ns2.is-fun.net
NameserverAddressesNetwork (AS)Glue
ns1.is-fun.net212.114.35.78AS12843 TELEMAXX - TelemaxX Telekommunikation GmbH, DE-
ns2.is-fun.net192.174.68.100 2001:67c:1bc::100AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.is-fun.net, ns2.is-fun.net.
    #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 1 IPv6 /48.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12843 (TELEMAXX - TelemaxX Telekommunikation GmbH, DE): 1 address; AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 2 addresses.
  • 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.is-fun.net.
    #13

Nameservers

warn

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.is-fun.net 212.114.35.78NOERROR, 6 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns2.is-fun.net 192.174.68.100NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.is-fun.net 2001:67c:1bc::100NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS

Checks

  • ✓ All respond #14
    All 3 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.is-fun.net: "9.18.49-1~deb12u2-Debian". 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 2026030447 · primary ns1.is-fun.net

Found

Primary (MNAME)
ns1.is-fun.net
Contact (RNAME)
hostmaster.is-fun.com
Serial
2026030447
Refresh / retry
86400 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.is-fun.net (212.114.35.78)2026030447
ns2.is-fun.net (192.174.68.100)2026030447
ns2.is-fun.net (2001:67c:1bc::100)2026030447

Checks

  • ✓ Serial 2026030447 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.is-fun.net is one of the listed nameservers.
  • ✓ Contact hostmaster@is-fun.com #25
    The SOA RNAME hostmaster.is-fun.com means hostmaster@is-fun.com.
  • ✓ Date-based serial #26
    The serial 2026030447 follows the YYYYMMDDnn convention (2026-03-04).

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

10 records at the apex

Found

Read from
212.114.35.78:53
TypeValueTTL
SOAns1.is-fun.net. hostmaster.is-fun.com. 2026030447 86400 7200 604800 86400300
NSns1.is-fun.net.300
NSns2.is-fun.net.300
A185.215.158.114300
MX40 mx4.agenturserver.de.300
MX10 mx1.agenturserver.de.300
MX20 mx2.agenturserver.de.300
MX30 mx3.agenturserver.de.300
TXT"v=spf1 mx a:smtp-o-1.desy.de a:smtp-o-2.desy.de a:smtp-o-3.desy.de a:smtp-o-4.desy.de a:smtp-o-5.desy.de a:smtp-o-6.desy.de include:spf.simplethings.de include:spf.brevo.com include:agenturserver.de ~all"300
TXT"brevo-code:8db9a491a8d711005996962e78cc8fe3"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