helmholtz.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 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

info

ns1.routing.net, ns2.routing.net, ns3.routing.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.routing.net, ns2.routing.net, ns3.routing.net
NS in the zone
ns1.routing.net, ns2.routing.net, ns3.routing.net
NameserverAddressesNetwork (AS)Glue
ns1.routing.net134.0.30.178 2a03:2900:3:1::2AS48823 AS48823 - Hosting.de GmbH, DE AS48823 AS48823 - Hosting.de GmbH, DE-
ns2.routing.net194.50.113.2 2001:4d8f:2::2AS41637 ROUTING-ANYCAST - Hosting.de GmbH, DE AS41637 ROUTING-ANYCAST - Hosting.de GmbH, DE-
ns3.routing.net194.126.196.2 2a03:2902:3:1::2AS31400 ACCELERATED-IT - firstcolo GmbH, DE AS31400 ACCELERATED-IT - firstcolo GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.routing.net, ns2.routing.net, ns3.routing.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 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS31400 (ACCELERATED-IT - firstcolo GmbH, DE): 2 addresses; AS41637 (ROUTING-ANYCAST - Hosting.de GmbH, DE): 2 addresses; AS48823 (AS48823 - Hosting.de GmbH, DE): 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.routing.net 134.0.30.178NOERROR, 103 ms, authoritativenoyes / yesrefused-
ns1.routing.net 2a03:2900:3:1::2NOERROR, 101 ms, authoritativenoyes / yesrefused-
ns2.routing.net 194.50.113.2NOERROR, 48 ms, authoritativenoyes / yesrefused-
ns2.routing.net 2001:4d8f:2::2NOERROR, 47 ms, authoritativenoyes / yesrefused-
ns3.routing.net 194.126.196.2NOERROR, 97 ms, authoritativenoyes / yesrefused-
ns3.routing.net 2a03:2902:3:1::2NOERROR, 95 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026101901 · primary ns1.routing.net

Found

Primary (MNAME)
ns1.routing.net
Contact (RNAME)
hostmaster.helmholtz.de
Serial
2026101901
Refresh / retry
86400 s / 7200 s
Expire
3600000 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns1.routing.net (134.0.30.178)2026101901
ns1.routing.net (2a03:2900:3:1::2)2026101901
ns2.routing.net (194.50.113.2)2026101901
ns2.routing.net (2001:4d8f:2::2)2026101901
ns3.routing.net (194.126.196.2)2026101901
ns3.routing.net (2a03:2902:3:1::2)2026101901

Checks

  • ✓ Serial 2026101901 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 1000h, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.routing.net is one of the listed nameservers.
  • ✓ Contact hostmaster@helmholtz.de #25
    The SOA RNAME hostmaster.helmholtz.de means hostmaster@helmholtz.de.
  • ✓ Date-based serial #26
    The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

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

warn

21 records at the apex

Found

Read from
134.0.30.178:53
TypeValueTTL
SOAns1.routing.net. hostmaster.helmholtz.de. 2026101901 86400 7200 3600000 90086400
NSns3.routing.net.3600
NSns2.routing.net.3600
NSns1.routing.net.3600
A95.129.51.251120
MX10 mgw01.cloud-mgmt.net.3600
MX20 mgw02.cloud-mgmt.net.3600
TXT"swisssign-check=E5nuCQ1ts6Du5U1leKiCzViI5lY"3600
TXT"swisssign-check=PhSKhASmrh7CS9-_I6DHQOwzf3w"3600
TXT"apple-domain-verification=Kh7vQH82RebJE5AY"3600
TXT"HARICA-PVr9kAgWtmdhdcupqRX"3600
TXT"brevo-code:c62f21badc91570a90d362fefed4cf5d"3600
TXT"google-site-verification=PHfJVkRzrZKq_zSBRAjgBGAeFSZekvPn0IfPPc5QMbg"3600
TXT"MS=07072B3F52B6BEFC0A64EE094FC4788FD2BAA6B4"3600
TXT"pardot954983=356afb39b2ff4e150507c952853bea3f803066d11a97bf307be970198871a80f"3600
TXT"brevo-code:04e573a4def420d29b82f96c89d76d99"86400
TXT"v=spf1 mx a:mgw01.cloud-mgmt.net a:mgw02.cloud-mgmt.net ip4:95.129.51.248/30 ip4:95.129.51.251 include:spf.brevo.com include:spf.de.umantis.com include:spf.routing.net include:_spf.zimpel.de include:spf.mailjet.com -all"3600
TXT"email-verification=SPe6DrJpJs/CQ0MF8HOJz+MIqgjywrB0NSbx+qmk+qgF3lRvQ/tWDhRX7mTGbXev"3600
TXT"brevo-code:eaa5aac311b3565e76e59ce3e8a1aa09"3600
TXT"MS=ms34081645"3600
TXT"asv=1837817f9c26b896f96f9dff9c2fa5ac"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (2m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
    #32
  • ✓ 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