ph-freiburg.de

Checked 21 October 2026, 23:50 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

dns0.fun.uni-freiburg.de, dns1.belwue.de, dns3.belwue.de, lis0.ph-freiburg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns0.fun.uni-freiburg.de, dns1.belwue.de, dns3.belwue.de, lis0.ph-freiburg.de
NS in the zone
dns0.fun.uni-freiburg.de, dns1.belwue.de, dns3.belwue.de, lis0.ph-freiburg.de
NameserverAddressesNetwork (AS)Glue
dns0.fun.uni-freiburg.de132.230.200.200 2001:7c0:2500:1::53:0AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE132.230.200.200 2001:7c0:2500:1::53:0
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
lis0.ph-freiburg.de193.197.132.1AS553 BELWUE - Universitaet Stuttgart, DE193.197.132.1

Checks

  • ✓ 4 nameservers #6
    Delegated to dns0.fun.uni-freiburg.de, dns1.belwue.de, dns3.belwue.de, lis0.ph-freiburg.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: lis0.ph-freiburg.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 4 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, DE): 7 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: lis0.ph-freiburg.de.
    #13

Nameservers

warn

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns0.fun.uni-freiburg.de 132.230.200.200NOERROR, 11 ms, authoritativenoyes / yesrefusedunknown
dns0.fun.uni-freiburg.de 2001:7c0:2500:1::53:0NOERROR, 8 ms, authoritativenoyes / yesrefusedunknown
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)
lis0.ph-freiburg.de 193.197.132.1NOERROR, 10 ms, authoritativenoyes / yesrefusednone

Checks

  • ✓ All respond #14
    All 7 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 2026102001 · primary lis0.ph-freiburg.de

Found

Primary (MNAME)
lis0.ph-freiburg.de
Contact (RNAME)
lauffer.ph-freiburg.de
Serial
2026102001
Refresh / retry
21600 s / 3600 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns0.fun.uni-freiburg.de (132.230.200.200)2026102001
dns0.fun.uni-freiburg.de (2001:7c0:2500:1::53:0)2026102001
dns1.belwue.de (129.143.2.10)2026102001
dns1.belwue.de (2001:7c0::53:10)2026102001
dns3.belwue.de (129.143.253.133)2026102001
dns3.belwue.de (2001:7c0:0:253::133)2026102001
lis0.ph-freiburg.de (193.197.132.1)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 28d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver lis0.ph-freiburg.de is one of the listed nameservers.
  • ✓ Contact lauffer@ph-freiburg.de #25
    The SOA RNAME lauffer.ph-freiburg.de means lauffer@ph-freiburg.de.
  • ✓ Date-based serial #26
    The serial 2026102001 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

pass

25 records at the apex

Found

Read from
132.230.200.200:53
TypeValueTTL
SOAlis0.ph-freiburg.de. lauffer.ph-freiburg.de. 2026102001 21600 3600 2419200 8640028800
NSdns0.fun.uni-freiburg.de.28800
NSdns1.belwue.de.28800
NSdns3.belwue.de.28800
NSlis0.ph-freiburg.de.28800
A193.197.143.15986400
MX10 c3041.mx.srv.dfn.de.28800
MX10 a3041.mx.srv.dfn.de.28800
MX10 b3041.mx.srv.dfn.de.28800
TXT"MS=B951E6CFE9EF8B656D023D789786CDDE1693C396"3600
TXT"apple-domain-verification=Bj5aZOd6a8vryihJ"3600
TXT"v=spf1 include:_spf.ph-freiburg.de -all"3600
TXT"google-site-verification=4uvT1a3LykyqpbjfS8-AAbelfu_HRXJZTvZIvVXH1i8"3600
TXT"google-gws-recovery-domain-verification=52488488"3600
TXT"abuseipdb-verification=YyO5CIrf"3600
TXT"jamf-site-verification=XHlMqgKx7H3oW1WfVOgtFg"3600
TXT"HARICA-a8Khn2KC3OqtKUzh65H"3600
TXT"adobe-idp-site-verification=987c27313c36f133a4f9d106326de9b097c90557b6439fc083d2e4e2dab88908"3600
CAA0 issuewild "harica.gr"28800
CAA0 issue "harica.gr"28800
CAA0 issuewild "sectigo.com"28800
CAA0 issue "pki.dfn.de"28800
CAA0 issue "sectigo.com"28800
CAA0 iodef "mailto:support@ph-freiburg.de"28800
CAA0 issue "letsencrypt.org"28800

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 8h, NS 8h. The NS TTL at the parent is 1d and in the zone 8h; 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: harica.gr, sectigo.com, pki.dfn.de, letsencrypt.org.