ph-heidelberg.de

Checked 21 October 2026, 23:50 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

dns.uni-heidelberg.de, dns1.belwue.de, dns2.uni-heidelberg.de, dns3.belwue.de, dns5.belwue.de, mta02.ph-heidelberg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.uni-heidelberg.de, dns1.belwue.de, dns2.uni-heidelberg.de, dns3.belwue.de, dns5.belwue.de, mta02.ph-heidelberg.de
NS in the zone
dns.uni-heidelberg.de, dns1.belwue.de, dns2.uni-heidelberg.de, dns3.belwue.de, dns5.belwue.de, mta02.ph-heidelberg.de
NameserverAddressesNetwork (AS)Glue
dns.uni-heidelberg.de129.206.100.126AS553 BELWUE - Universitaet Stuttgart, DE129.206.100.126
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
dns2.uni-heidelberg.de129.206.210.127AS553 BELWUE - Universitaet Stuttgart, DE129.206.210.127
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
mta02.ph-heidelberg.de129.206.114.6AS553 BELWUE - Universitaet Stuttgart, DE129.206.114.6

Checks

  • ✓ 6 nameservers #6
    Delegated to dns.uni-heidelberg.de, dns1.belwue.de, dns2.uni-heidelberg.de, dns3.belwue.de, dns5.belwue.de, mta02.ph-heidelberg.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: mta02.ph-heidelberg.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): 9 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: dns.uni-heidelberg.de, dns2.uni-heidelberg.de, mta02.ph-heidelberg.de.
    #13

Nameservers

warn

9 of 9 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.uni-heidelberg.de 129.206.100.126NOERROR, 7 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
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)
dns2.uni-heidelberg.de 129.206.210.127NOERROR, 9 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
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)
mta02.ph-heidelberg.de 129.206.114.6NOERROR, 11 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian

Checks

  • ✓ All respond #14
    All 9 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: dns.uni-heidelberg.de: "9.11.36-RedHat-9.11.36-16.el8_10.16"; dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns2.uni-heidelberg.de: "9.11.36-RedHat-9.11.36-16.el8_10.16"; 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)"; mta02.ph-heidelberg.de: "9.18.49-1~deb12u2-Debian". 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 20260915 · primary mta02.ph-heidelberg.de

Found

Primary (MNAME)
mta02.ph-heidelberg.de
Contact (RNAME)
hostmaster.ph-heidelberg.de
Serial
20260915
Refresh / retry
21600 s / 1800 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns.uni-heidelberg.de (129.206.100.126)20260915
dns1.belwue.de (129.143.2.10)20260915
dns1.belwue.de (2001:7c0::53:10)20260915
dns2.uni-heidelberg.de (129.206.210.127)20260915
dns3.belwue.de (129.143.253.133)20260915
dns3.belwue.de (2001:7c0:0:253::133)20260915
dns5.belwue.de (129.143.4.5)20260915
dns5.belwue.de (2001:7c0::53:5)20260915
mta02.ph-heidelberg.de (129.206.114.6)20260915

Checks

  • ✓ Serial 20260915 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 30m, expire 28d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver mta02.ph-heidelberg.de is one of the listed nameservers.
  • ✓ Contact hostmaster@ph-heidelberg.de #25
    The SOA RNAME hostmaster.ph-heidelberg.de means hostmaster@ph-heidelberg.de.
  • ✓ Counter serial #26
    The serial 20260915 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

16 records at the apex

Found

Read from
129.206.100.126:53
TypeValueTTL
SOAmta02.ph-heidelberg.de. hostmaster.ph-heidelberg.de. 20260915 21600 1800 2419200 8640086400
NSdns.uni-heidelberg.de.86400
NSmta02.ph-heidelberg.de.86400
NSdns5.belwue.de.86400
NSdns3.belwue.de.86400
NSdns1.belwue.de.86400
NSdns2.uni-heidelberg.de.86400
A217.29.41.3386400
MX10 relay.uni-heidelberg.de.86400
MX30 relay3.uni-heidelberg.de.86400
MX20 relay2.uni-heidelberg.de.86400
TXT"<20.06.2024>"86400
TXT"v=spf1 mx ip4:193.197.132.76 include:spf.protection.outlook.com include:spf.hornetsecurity.com ~all"86400
TXT"apple-domain-verification=pb0m1UCa2VdijgZH"86400
TXT"google-site-verification=axN64Jm4Ze_Elo56d4uepXDyyPyixcQCQs1Bc_0m4-8"86400
TXT"HARICA-xY1sFAUg9rkBK5D8ZBV"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, NS 1d.
  • ✓ 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