allergieinformationsdienst.de

Checked 21 October 2026, 21:28 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 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

dns-1.dfn.de, dns-3.dfn.de, dnsx1.helmholtz-muenchen.de, dnsx2.helmholtz-muenchen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, dns-3.dfn.de, dnsx1.helmholtz-muenchen.de, dnsx2.helmholtz-muenchen.de
NS in the zone
dns-1.dfn.de, dns-3.dfn.de, dnsx1.helmholtz-muenchen.de, dnsx2.helmholtz-muenchen.de
NameserverAddressesNetwork (AS)Glue
dns-1.dfn.de193.174.75.50 2001:638:d:b101::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dnsx1.helmholtz-muenchen.de146.107.4.188AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE146.107.4.188
dnsx2.helmholtz-muenchen.de146.107.3.188AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE146.107.3.188

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-1.dfn.de, dns-3.dfn.de, dnsx1.helmholtz-muenchen.de, dnsx2.helmholtz-muenchen.de.
  • ✓ 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 2001:638:d::/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 (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 6 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dnsx1.helmholtz-muenchen.de, dnsx2.helmholtz-muenchen.de.
    #13

Nameservers

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 17 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 17 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 9 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dnsx1.helmholtz-muenchen.de 146.107.4.188NOERROR, 11 ms, authoritativenoyes / yesrefused9.16.23-RH
dnsx2.helmholtz-muenchen.de 146.107.3.188NOERROR, 12 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.9.17 (built Aug 5 2026 13:33:52 by root@localhost)

Checks

  • ✓ All respond #14
    All 6 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: dnsx1.helmholtz-muenchen.de: "9.16.23-RH"; dnsx2.helmholtz-muenchen.de: "PowerDNS Authoritative Server 4.9.17 (built Aug 5 2026 13:33:52 by root@localhost)". 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 2024053015 · primary dnsx1.helmholtz-muenchen.de

Found

Primary (MNAME)
dnsx1.helmholtz-muenchen.de
Contact (RNAME)
domains.helmholtz-muenchen.de
Serial
2024053015
Refresh / retry
1200 s / 600 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2024053015
dns-1.dfn.de (2001:638:d:b101::1)2024053015
dns-3.dfn.de (193.174.75.58)2024053015
dns-3.dfn.de (2001:638:d:b103::1)2024053015
dnsx1.helmholtz-muenchen.de (146.107.4.188)2024053015
dnsx2.helmholtz-muenchen.de (146.107.3.188)2024053015

Checks

  • ✓ Serial 2024053015 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 20m, retry 10m, expire 14d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dnsx1.helmholtz-muenchen.de is one of the listed nameservers.
  • ✓ Contact domains@helmholtz-muenchen.de #25
    The SOA RNAME domains.helmholtz-muenchen.de means domains@helmholtz-muenchen.de.
  • ✓ Date-based serial #26
    The serial 2024053015 follows the YYYYMMDDnn convention (2024-05-30).

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
193.174.75.50:53
TypeValueTTL
SOAdnsx1.helmholtz-muenchen.de. domains.helmholtz-muenchen.de. 2024053015 1200 600 1209600 600600
NSdns-1.dfn.de.600
NSdnsx1.helmholtz-muenchen.de.600
NSdns-3.dfn.de.600
NSdnsx2.helmholtz-muenchen.de.600
A157.90.187.147600
MX10 allergieinformationsdienst-de.mail.protection.outlook.com.600
TXT"v=spf1 include:spf.protection.outlook.com -all"800
TXT"MS=ms75063540"800
TXT"HARICA-b7SMXOdCCvguQNautAr"800

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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