zi-mannheim.de

Checked 22 October 2026, 01:20 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, dns5.belwue.de, zima04.zi-mannheim.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns5.belwue.de, zima04.zi-mannheim.de
NS in the zone
dns1.belwue.de, dns5.belwue.de, zima04.zi-mannheim.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
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
zima04.zi-mannheim.de193.196.9.129AS553 BELWUE - Universitaet Stuttgart, DE193.196.9.129

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.belwue.de, dns5.belwue.de, zima04.zi-mannheim.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: zima04.zi-mannheim.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): 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: zima04.zi-mannheim.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)
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)
zima04.zi-mannheim.de 193.196.9.129NOERROR, 6 ms, authoritativenoyes / yesrefused9.9.4-RedHat-9.9.4-29.el7

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)"; dns5.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; zima04.zi-mannheim.de: "9.9.4-RedHat-9.9.4-29.el7". 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 2026061201 · primary zima04.zi-mannheim.de

Found

Primary (MNAME)
zima04.zi-mannheim.de
Contact (RNAME)
postmaster.zi-mannheim.de
Serial
2026061201
Refresh / retry
21600 s / 3600 s
Expire
2419200 s
Negative TTL
17280 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026061201
dns1.belwue.de (2001:7c0::53:10)2026061201
dns5.belwue.de (129.143.4.5)2026061201
dns5.belwue.de (2001:7c0::53:5)2026061201
zima04.zi-mannheim.de (193.196.9.129)2026061201

Checks

  • ✓ Serial 2026061201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 28d, negative TTL 288m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver zima04.zi-mannheim.de is one of the listed nameservers.
  • ✓ Contact postmaster@zi-mannheim.de #25
    The SOA RNAME postmaster.zi-mannheim.de means postmaster@zi-mannheim.de.
  • ✓ Date-based serial #26
    The serial 2026061201 follows the YYYYMMDDnn convention (2026-06-12).

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

10 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAzima04.zi-mannheim.de. postmaster.zi-mannheim.de. 2026061201 21600 3600 2419200 17280172800
NSdns1.belwue.de.172800
NSzima04.zi-mannheim.de.172800
NSdns5.belwue.de.172800
A5.9.167.2283600
MX0 zilxse01.zi-mannheim.de.43200
MX10 zilxse02.zi-mannheim.de.43200
TXT"MS=CEC36301068F8DAD73FB5E99ED85CC5CD5823750"172800
TXT"v=spf1 ip4:5.9.107.25/32 ip4:5.9.167.228/32 ip4:5.9.167.229/32 ip4:193.196.9.196/32 ip4:193.196.9.197/32 ip4:193.196.9.152/32 include:de.umantis.com -all"172800
TXT"apple-domain-verification=Ors308zjfaLI36Yf"172800

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 12h, 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.
  • 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