uniklinik-ulm.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 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

dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.uniklinik-ulm.de, ns2.uniklinik-ulm.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, ns1.uniklinik-ulm.de, ns2.uniklinik-ulm.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.uniklinik-ulm.de, ns2.uniklinik-ulm.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
ns1.uniklinik-ulm.de193.197.70.5AS553 BELWUE - Universitaet Stuttgart, DE193.197.70.5
ns2.uniklinik-ulm.de193.197.70.6AS553 BELWUE - Universitaet Stuttgart, DE193.197.70.6

Checks

  • ✓ 5 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.uniklinik-ulm.de, ns2.uniklinik-ulm.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.uniklinik-ulm.de, ns2.uniklinik-ulm.de.
  • ✓ 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): 8 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: ns1.uniklinik-ulm.de, ns2.uniklinik-ulm.de.
    #13

Nameservers

warn

8 of 8 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)
ns1.uniklinik-ulm.de 193.197.70.5NOERROR, 9 ms, authoritativenoyes / yesrefusednot currently available
ns2.uniklinik-ulm.de 193.197.70.6NOERROR, 9 ms, authoritativenoyes / yesrefusednot currently available

Checks

  • ✓ All respond #14
    All 8 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

pass

serial 2026100501 · primary ns1.uniklinik-ulm.de

Found

Primary (MNAME)
ns1.uniklinik-ulm.de
Contact (RNAME)
hostmaster.uniklinik-ulm.de
Serial
2026100501
Refresh / retry
21600 s / 3600 s
Expire
2419200 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026100501
dns1.belwue.de (2001:7c0::53:10)2026100501
dns3.belwue.de (129.143.253.133)2026100501
dns3.belwue.de (2001:7c0:0:253::133)2026100501
dns5.belwue.de (129.143.4.5)2026100501
dns5.belwue.de (2001:7c0::53:5)2026100501
ns1.uniklinik-ulm.de (193.197.70.5)2026100501
ns2.uniklinik-ulm.de (193.197.70.6)2026100501

Checks

  • ✓ Serial 2026100501 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 28d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.uniklinik-ulm.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uniklinik-ulm.de #25
    The SOA RNAME hostmaster.uniklinik-ulm.de means hostmaster@uniklinik-ulm.de.
  • ✓ Date-based serial #26
    The serial 2026100501 follows the YYYYMMDDnn convention (2026-10-05).

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

pass

17 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAns1.uniklinik-ulm.de. hostmaster.uniklinik-ulm.de. 2026100501 21600 3600 2419200 360086400
NSdns3.belwue.de.172800
NSns2.uniklinik-ulm.de.172800
NSdns5.belwue.de.172800
NSns1.uniklinik-ulm.de.172800
NSdns1.belwue.de.172800
A193.197.70.87172800
MX70 lili.uniklinik-ulm.de.172800
TXT"apple-domain-verification=Ee5lD0sayG2uRoFz"3600
TXT"teamviewer-sso-verification=01d9d5a0b28b4ec78cd6b050824ce044"3600
TXT"MS=F36472E7FA5315EB686D2C91805CDAC6798D4335"3600
TXT"v=spf1 mx ip4:193.197.70.20 include:spf.protection.outlook.com -all"3600
TXT"google-site-verification=67zYQEiQitJDTDJqIYEb559_AFj6yHvsOMXYxFtXu1M"3600
CAA0 issue "digicert.com"3600
CAA0 issue "harica.gr"3600
CAA0 iodef "mailto:ssladmin@uniklinik-ulm.de"3600
CAA0 issue "letsencrypt.org"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 2d, MX 2d, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, harica.gr, letsencrypt.org.