uniklinik-freiburg.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 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, skl1.ukl.uni-freiburg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, skl1.ukl.uni-freiburg.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, skl1.ukl.uni-freiburg.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
skl1.ukl.uni-freiburg.de193.196.199.1AS553 BELWUE - Universitaet Stuttgart, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, skl1.ukl.uni-freiburg.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): 5 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: skl1.ukl.uni-freiburg.de.
    #13

Nameservers

warn

5 of 5 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)
skl1.ukl.uni-freiburg.de 193.196.199.1NOERROR, 10 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 5 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)". 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

pass

serial 657918376 · primary skl1.ukl.uni-freiburg.de

Found

Primary (MNAME)
skl1.ukl.uni-freiburg.de
Contact (RNAME)
root.skl1.ukl.uni-freiburg.de
Serial
657918376
Refresh / retry
3601 s / 3600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)657918376
dns1.belwue.de (2001:7c0::53:10)657918376
dns3.belwue.de (129.143.253.133)657918376
dns3.belwue.de (2001:7c0:0:253::133)657918376
skl1.ukl.uni-freiburg.de (193.196.199.1)657918376

Checks

  • ✓ Serial 657918376 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h0m1s, retry 1h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver skl1.ukl.uni-freiburg.de is one of the listed nameservers.
  • ✓ Contact root@skl1.ukl.uni-freiburg.de #25
    The SOA RNAME root.skl1.ukl.uni-freiburg.de means root@skl1.ukl.uni-freiburg.de.
  • ✓ Counter serial #26
    The serial 657918376 is a plain counter.

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

23 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAskl1.ukl.uni-freiburg.de. root.skl1.ukl.uni-freiburg.de. 657918376 3601 3600 1209600 36003601
NSdns1.belwue.de.3601
NSskl1.ukl.uni-freiburg.de.3601
NSdns3.belwue.de.3601
A193.196.199.2063601
MX99 c1711.mx.srv.dfn.de.3601
MX99 a1711.mx.srv.dfn.de.3601
MX99 b1711.mx.srv.dfn.de.3601
TXT"HARICA-QF5M5bcQFcQRsvuqDnT"3601
TXT"HARICA-d0R8mox8OchwZ7qlTM4"3601
TXT"MS=10C526C1243F5CF3F350C9EDF6E6FCA0EE450D87"3601
TXT"adobe-idp-site-verification=c975f953bde04470aade56cbb849993a23ef4e01033fec89bedb0aed2c843fb9"3601
TXT"apple-domain-verification=8ohggOXo4C6TqFfm"3601
TXT"cisco-ci-domain-verification=7717229cb12fdba6c92001ace487111f376bff7995a1e390025ccfd9ec6d6c3e"3601
TXT"ftapi-domain-verification=87t6nBQvsh9EMSyS5SDP7nQbavdZti6a"3601
TXT"google-site-verification=HeFmRgOg6pMQ7PoUs6GrDuHJJLHP_dnj3kRFef5Oivk"3601
TXT"google-site-verification=IDUSWyfBuv5pLBF-dvcQaW6vkJBiMiwLkKMJPmGd7bA"3601
TXT"google-site-verification=e2ulrLnEwD3vedbwA0MOoe-XKnH1MM_SAChghOFntJM"3601
TXT"google-site-verification=qlyvwN8Dv5tlJ8YVnv3pGIsba9H36z7zy2USqZcnUjo"3601
TXT"jamf-site-verification=aLhumb2lv5N6DuWKoaFj6Q"3601
TXT"logmein-verification-code=f12f166b-d8e0-4f9c-a234-6eae3622fc21"3601
TXT"openai-domain-verification=dv-gUu1XS5fiT0Q0SBqdyULReun"3601
TXT"v=spf1 a mx ip4:193.196.199.0/24 ip4:193.196.193.0/24 ip4:132.230.2.0/24 ip4:185.26.156.132/32 ip4:134.106.51.109/32 ip4:134.106.52.239/32 ip4:87.190.41.20/32 ip4:134.106.52.6/32 ip4:5.253.0.79/32 ip4:89.107.189.247/32 ip4:80.155.180.186/32 ip4:132.230.18" "3.100/32 ip4:176.9.89.163/32 ip4:193.197.131.2/32 include:_spf.o171.mx.srv.dfn.de include:spf.coredinate.de include:_spf.pretix.eu -all"3601

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h0m1s, MX 1h0m1s, NS 1h0m1s. The NS TTL at the parent is 1d and in the zone 1h0m1s; 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