sinus-institut.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 3 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

pass

helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com
NS in the zone
helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com
NameserverAddressesNetwork (AS)Glue
helium.ns.hetzner.de193.47.99.5 2001:67c:192c::add:5AS12337 NORIS-NETWORK - noris network AG, DE AS12337 NORIS-NETWORK - noris network AG, DE-
hydrogen.ns.hetzner.com213.133.100.98 2a01:4f8:0:1::add:1098AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
oxygen.ns.hetzner.com88.198.229.192 2a01:4f8:0:1::add:2992AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com.
  • ✓ 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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12337 (NORIS-NETWORK - noris network AG, DE): 2 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .de.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
helium.ns.hetzner.de 193.47.99.5NOERROR, 9 ms, authoritativenoyes / yesrefused-
helium.ns.hetzner.de 2001:67c:192c::add:5NOERROR, 8 ms, authoritativenoyes / yesrefused-
hydrogen.ns.hetzner.com 213.133.100.98NOERROR, 3 ms, authoritativenoyes / yesrefused-
hydrogen.ns.hetzner.com 2a01:4f8:0:1::add:1098NOERROR, 1 ms, authoritativenoyes / yesrefused-
oxygen.ns.hetzner.com 88.198.229.192NOERROR, 3 ms, authoritativenoyes / yesrefused-
oxygen.ns.hetzner.com 2a01:4f8:0:1::add:2992NOERROR, 3 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 2026101505 · primary helium.ns.hetzner.de

Found

Primary (MNAME)
helium.ns.hetzner.de
Contact (RNAME)
administrator.sinus-institut.de
Serial
2026101505
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
helium.ns.hetzner.de (193.47.99.5)2026101505
helium.ns.hetzner.de (2001:67c:192c::add:5)2026101505
hydrogen.ns.hetzner.com (213.133.100.98)2026101505
hydrogen.ns.hetzner.com (2a01:4f8:0:1::add:1098)2026101505
oxygen.ns.hetzner.com (88.198.229.192)2026101505
oxygen.ns.hetzner.com (2a01:4f8:0:1::add:2992)2026101505

Checks

  • ✓ Serial 2026101505 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver helium.ns.hetzner.de is one of the listed nameservers.
  • ✓ Contact administrator@sinus-institut.de #25
    The SOA RNAME administrator.sinus-institut.de means administrator@sinus-institut.de.
  • ✓ Date-based serial #26
    The serial 2026101505 follows the YYYYMMDDnn convention (2026-10-15).

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

9 records at the apex

Found

Read from
193.47.99.5:53
TypeValueTTL
SOAhelium.ns.hetzner.de. administrator.sinus-institut.de. 2026101505 10800 3600 1209600 360086400
NShelium.ns.hetzner.de.86400
NShydrogen.ns.hetzner.com.86400
NSoxygen.ns.hetzner.com.86400
A116.202.120.1886400
MX0 sinusinstitut-de01c.mail.protection.outlook.com.86400
TXT"MS=ms90789575"86400
TXT"google-site-verification=WiD3RbCPpLkWWu5ccvKOReWRvdGrkSxsLQ9mOYrgLX8"86400
TXT"v=spf1 a mx include:spf.dynect.net include:spf.protection.outlook.com include:spf.smtp.net include:_spf.sinus-institut.de -all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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