hochschule-stralsund.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
!Passed with warnings
22 passed 1 warning 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

deneb.dfn.de, ns1.hochschule-stralsund.de, ns2.hochschule-stralsund.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, ns1.hochschule-stralsund.de, ns2.hochschule-stralsund.de
NS in the zone
deneb.dfn.de, ns1.hochschule-stralsund.de, ns2.hochschule-stralsund.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns1.hochschule-stralsund.de194.94.72.50 2001:638:805::120:1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.72.50 2001:638:805::120:1
ns2.hochschule-stralsund.de194.94.72.130 2001:638:805::122:1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.72.130 2001:638:805::122:1

Checks

  • ✓ 3 nameservers #6
    Delegated to deneb.dfn.de, ns1.hochschule-stralsund.de, ns2.hochschule-stralsund.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.hochschule-stralsund.de, ns2.hochschule-stralsund.de.
  • ✓ 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 2 IPv6 /48s.
  • 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 13 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 13 ms, authoritativenoyes / yesrefused0
ns1.hochschule-stralsund.de 194.94.72.50NOERROR, 16 ms, authoritativenoyes / yesrefused-
ns1.hochschule-stralsund.de 2001:638:805::120:1NOERROR, 16 ms, authoritativenoyes / yesrefused-
ns2.hochschule-stralsund.de 194.94.72.130NOERROR, 16 ms, authoritativenoyes / yesrefused-
ns2.hochschule-stralsund.de 2001:638:805::122:1NOERROR, 16 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: deneb.dfn.de: "0".
    #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 2026102000 · primary ns1.hochschule-stralsund.de

Found

Primary (MNAME)
ns1.hochschule-stralsund.de
Contact (RNAME)
dnsadmin.hochschule-stralsund.de
Serial
2026102000
Refresh / retry
43200 s / 1800 s
Expire
1296000 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026102000
deneb.dfn.de (2001:638:800:1::9)2026102000
ns1.hochschule-stralsund.de (194.94.72.50)2026102000
ns1.hochschule-stralsund.de (2001:638:805::120:1)2026102000
ns2.hochschule-stralsund.de (194.94.72.130)2026102000
ns2.hochschule-stralsund.de (2001:638:805::122:1)2026102000

Checks

  • ✓ Serial 2026102000 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 30m, expire 15d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.hochschule-stralsund.de is one of the listed nameservers.
  • ✓ Contact dnsadmin@hochschule-stralsund.de #25
    The SOA RNAME dnsadmin.hochschule-stralsund.de means dnsadmin@hochschule-stralsund.de.
  • ✓ Date-based serial #26
    The serial 2026102000 follows the YYYYMMDDnn convention (2026-10-20).

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
192.76.176.9:53
TypeValueTTL
SOAns1.hochschule-stralsund.de. dnsadmin.hochschule-stralsund.de. 2026102000 43200 1800 1296000 180030000
NSdeneb.dfn.de.30000
NSns1.hochschule-stralsund.de.30000
NSns2.hochschule-stralsund.de.30000
A141.53.15.120300
MX10 a1871.mx.srv.dfn.de.30000
MX10 b1871.mx.srv.dfn.de.30000
MX10 c1871.mx.srv.dfn.de.30000
TXT"adobe-idp-site-verification=ab9780ae9872e23dcc705711ecdc8f819332745970e9d5516f8c9f9985779325"3600
TXT"v=spf1 include:spf.mailsupport.dfn.de ip4:194.94.72.163 ip6:2001:638:805::38:163 ip4:194.94.72.220 ip6:2001:638:805::11:220 ip4:193.174.240.41 ip4:193.174.240.42 ip4:193.174.240.101 ip4:141.53.15.121 " "a:smtpoutbound.hochschule-stralsund.de a:mail.hochschule-stralsund.de ~all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 500m, NS 500m. The NS TTL at the parent is 1d and in the zone 500m; 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