studieren.de

Checked 22 October 2026, 00:31 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 0 failed 5 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.noris.ch, dns.noris.de, dns.noris.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.noris.ch, dns.noris.de, dns.noris.net
NS in the zone
dns.noris.ch, dns.noris.de, dns.noris.net
NameserverAddressesNetwork (AS)Glue
dns.noris.ch194.31.2.65 2001:780:53d3::53AS12337 NORIS-NETWORK - noris network AG, DE AS12337 NORIS-NETWORK - noris network AG, DE-
dns.noris.de192.109.102.65 2001:780:53d2::53AS12337 NORIS-NETWORK - noris network AG, DE AS12337 NORIS-NETWORK - noris network AG, DE192.109.102.65 2001:780:53d2::53
dns.noris.net213.95.0.65 2001:780:53d1::53AS12337 NORIS-NETWORK - noris network AG, DE AS12337 NORIS-NETWORK - noris network AG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns.noris.ch, dns.noris.de, dns.noris.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS12337 (NORIS-NETWORK - noris network AG, 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
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .ch, .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.noris.ch 194.31.2.65NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns.noris.ch 2001:780:53d3::53NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns.noris.de 192.109.102.65NOERROR, 5 ms, authoritativenoyes / yesrefused-
dns.noris.de 2001:780:53d2::53NOERROR, 5 ms, authoritativenoyes / yesrefused-
dns.noris.net 213.95.0.65NOERROR, 4 ms, authoritativenoyes / yesrefused-
dns.noris.net 2001:780:53d1::53NOERROR, 4 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

warn

serial 1668520127 · primary dns0.noris.net

Found

Primary (MNAME)
dns0.noris.net
Contact (RNAME)
hostmaster.noris.net
Serial
1668520127
Refresh / retry
86400 s / 86400 s
Expire
2419200 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns.noris.ch (194.31.2.65)1668520127
dns.noris.ch (2001:780:53d3::53)1668520127
dns.noris.de (192.109.102.65)1668520127
dns.noris.de (2001:780:53d2::53)1668520127
dns.noris.net (213.95.0.65)1668520127
dns.noris.net (2001:780:53d1::53)1668520127

Checks

  • ✓ Serial 1668520127 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1d should be shorter than refresh 1d. Current values: refresh 1d, retry 1d, expire 28d, negative TTL 10m.
    #23
  • i
    Hidden master
    The primary nameserver dns0.noris.net is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@noris.net #25
    The SOA RNAME hostmaster.noris.net means hostmaster@noris.net.
  • ✓ Timestamp serial #26
    The serial 1668520127 is a Unix timestamp (2022-11-15 13:48 UTC).

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

14 records at the apex

Found

Read from
194.31.2.65:53
TypeValueTTL
SOAdns0.noris.net. hostmaster.noris.net. 1668520127 86400 86400 2419200 60086400
NSdns.noris.de.86400
NSdns.noris.ch.86400
NSdns.noris.net.86400
A213.183.15.23600
MX150 mail2.studieren.de.3600
TXT"_yx3f6z07ucdoiufq5j4h0o5zful8yg8"3600
TXT"_m1o8sc15lkvimz7xq3vd4u6pmpb023q"3600
TXT"anthropic-domain-verification-e16gw0=eDvDB9MsKtCATl3mAbjMBZ29v"3600
TXT"google-site-verification=Vpf_CotwFnLBgbD8YlTypLHS5fZ9f00QNgzVk-1ekrc"3600
TXT"_1024uztam1q2p9n4wv3lpkuqdldzsgx"3600
TXT"_2i7lij4d0dwt3476hizwsubqgg3bzpu"3600
TXT"facebook-domain-verification=885k40ipmluvh5mbv4dkb6w1rdz7he"3600
TXT"v=spf1 a mx ip4:213.183.15.2 ip4:213.183.15.3 ip4:213.183.9.27 -all"3600

Checks

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