hs-furtwangen.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
19 passed 3 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

dns1.belwue.de, dns3.belwue.de, dns5.belwue.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NameserverAddressesNetwork (AS)Glue
dns1.belwue.de129.143.2.10 2001:7c0::53:10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.2.10 2001:7c0::53:10
dns3.belwue.de129.143.253.133 2001:7c0:0:253::133AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.253.133 2001:7c0:0:253::133
dns5.belwue.de129.143.4.5 2001:7c0::53:5AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.4.5 2001:7c0::53:5

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, dns5.belwue.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 2001:7c0::/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 (AS553 (BELWUE - Universitaet Stuttgart, 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

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.belwue.de 129.143.2.10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.belwue.de 2001:7c0::53:10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 129.143.253.133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 2001:7c0:0:253::133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns5.belwue.de 129.143.4.5NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns5.belwue.de 2001:7c0::53:5NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)

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: dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns3.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns5.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)". 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

warn

serial 2149706444 · primary ib1.intra.hs-furtwangen.de

Found

Primary (MNAME)
ib1.intra.hs-furtwangen.de
Contact (RNAME)
netzadmin.hs-furtwangen.de
Serial
2149706444
Refresh / retry
1800 s / 1800 s
Expire
9676800 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2149706444
dns1.belwue.de (2001:7c0::53:10)2149706444
dns3.belwue.de (129.143.253.133)2149706444
dns3.belwue.de (2001:7c0:0:253::133)2149706444
dns5.belwue.de (129.143.4.5)2149706444
dns5.belwue.de (2001:7c0::53:5)2149706444

Checks

  • ✓ Serial 2149706444 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 30m should be shorter than refresh 30m. Current values: refresh 30m, retry 30m, expire 112d, negative TTL 15m.
    #23
  • i
    Hidden master
    The primary nameserver ib1.intra.hs-furtwangen.de 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 netzadmin@hs-furtwangen.de #25
    The SOA RNAME netzadmin.hs-furtwangen.de means netzadmin@hs-furtwangen.de.
  • ✓ Timestamp serial #26
    The serial 2149706444 is a Unix timestamp (2038-02-13 20:40 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

18 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAib1.intra.hs-furtwangen.de. netzadmin.hs-furtwangen.de. 2149706444 1800 1800 9676800 90014400
NSdns1.belwue.de.14400
NSdns5.belwue.de.14400
NSdns3.belwue.de.14400
A141.28.1.1214400
MX10 c2901.mx.srv.dfn.de.14400
MX10 b2901.mx.srv.dfn.de.14400
MX10 a2901.mx.srv.dfn.de.14400
TXT"MS=7AD20DBA96C669DCEDCE46D44D9B7639E49997DE"3600
TXT"MS=ms31440678"3600
TXT"google-gws-recovery-domain-verification=52818883"3600
TXT"google-site-verification=2mjKdSLCs8K8l-PoPk_CZBn7NmQiFO-IkDck4puP-yg"3600
TXT"v=spf1 include:mailbox.org include:spf.de.umantis.com include:_spf.o290.mx.srv.dfn.de include:spf.hostsharing.net include:vst.hs-furtwangen.de ~all"3600
TXT"MS=ms28848881"3600
TXT"bw=nmuXHHFY54KZ0VCKhUkzJrZwvuIIe7poPSvTfdvpgCgk"3600
TXT"apple-domain-verification=OMQL7N7ofZjz1QIV"3600
TXT"google-site-verification=GQVQ-c3ojz6HlraSexfWLcDit0LcLyW_t-rhA7D8is4"3600
TXT"MS=DFA4E1A493C1FED63EA9605E95E62D2CF5F93441"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 4h, MX 4h, NS 4h. The NS TTL at the parent is 1d and in the zone 4h; 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