zwickau.de

Checked 22 October 2026, 01:20 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 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

pass

pns.dtag.de, s2vg300ns02.pzd-svn.de, s2vg300ns03.pzd-svn.de, secondary006.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
pns.dtag.de, s2vg300ns02.pzd-svn.de, s2vg300ns03.pzd-svn.de, secondary006.dtag.net
NS in the zone
pns.dtag.de, s2vg300ns02.pzd-svn.de, s2vg300ns03.pzd-svn.de, secondary006.dtag.net
NameserverAddressesNetwork (AS)Glue
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100
s2vg300ns02.pzd-svn.de31.12.60.11 2a02:101c:1800:1300::11AS61352 Sub-LIR-SN-AS - Staatsbetrieb Saechsische Informatik Dienste, DE AS61352 Sub-LIR-SN-AS - Staatsbetrieb Saechsische Informatik Dienste, DE31.12.60.11 2a02:101c:1800:1300::11
s2vg300ns03.pzd-svn.de31.12.60.12 2a02:101c:1800:1300::12AS61352 Sub-LIR-SN-AS - Staatsbetrieb Saechsische Informatik Dienste, DE AS61352 Sub-LIR-SN-AS - Staatsbetrieb Saechsische Informatik Dienste, DE31.12.60.12 2a02:101c:1800:1300::12
secondary006.dtag.net195.244.245.25 2a00:fa8:3:0:100:0:6:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to pns.dtag.de, s2vg300ns02.pzd-svn.de, s2vg300ns03.pzd-svn.de, secondary006.dtag.net.
  • ✓ 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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS3320 (DTAG - Deutsche Telekom AG, DE): 2 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses; AS61352 (Sub-LIR-SN-AS - Staatsbetrieb Saechsische Informatik Dienste, DE): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pns.dtag.de 194.25.0.125NOERROR, 9 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
s2vg300ns02.pzd-svn.de 31.12.60.11NOERROR, 10 ms, authoritativenoyes / yesrefusedUnknown
s2vg300ns02.pzd-svn.de 2a02:101c:1800:1300::11NOERROR, 10 ms, authoritativenoyes / yesrefusedUnknown
s2vg300ns03.pzd-svn.de 31.12.60.12NOERROR, 7 ms, authoritativenoyes / yesrefusedUnknown
s2vg300ns03.pzd-svn.de 2a02:101c:1800:1300::12NOERROR, 10 ms, authoritativenoyes / yesrefusedUnknown
secondary006.dtag.net 195.244.245.25NOERROR, 12 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary006.dtag.net 2a00:fa8:3:0:100:0:6:1NOERROR, 16 ms, authoritativenoyes / yesrefusedDomainNameServer

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: pns.dtag.de: "DomainNameServer"; s2vg300ns02.pzd-svn.de: "Unknown"; s2vg300ns03.pzd-svn.de: "Unknown"; secondary006.dtag.net: "DomainNameServer".
    #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

info

serial 2026090900 · primary ns.pzd-svn.de

Found

Primary (MNAME)
ns.pzd-svn.de
Contact (RNAME)
admin.pzd-svn.de
Serial
2026090900
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
pns.dtag.de (194.25.0.125)2026090900
pns.dtag.de (2003:40:8000::100)2026090900
s2vg300ns02.pzd-svn.de (31.12.60.11)2026090900
s2vg300ns02.pzd-svn.de (2a02:101c:1800:1300::11)2026090900
s2vg300ns03.pzd-svn.de (31.12.60.12)2026090900
s2vg300ns03.pzd-svn.de (2a02:101c:1800:1300::12)2026090900
secondary006.dtag.net (195.244.245.25)2026090900
secondary006.dtag.net (2a00:fa8:3:0:100:0:6:1)2026090900

Checks

  • ✓ Serial 2026090900 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 10m.
  • i
    Hidden master
    The primary nameserver ns.pzd-svn.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact admin@pzd-svn.de #25
    The SOA RNAME admin.pzd-svn.de means admin@pzd-svn.de.
  • ✓ Date-based serial #26
    The serial 2026090900 follows the YYYYMMDDnn convention (2026-09-09).

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

12 records at the apex

Found

Read from
194.25.0.125:53
TypeValueTTL
SOAns.pzd-svn.de. admin.pzd-svn.de. 2026090900 10800 3600 1209600 600600
NSS2VG300NS02.pzd-svn.de.600
NSpns.dtag.de.600
NSS2VG300NS03.pzd-svn.de.600
NSsecondary006.dtag.net.600
A195.243.10.200600
MX10 s2vg300mr02.pzd-svn.de.600
MX10 s2vg300mr01.pzd-svn.de.600
TXT"MS=11D77DF6A8932B4503854178998AE3B923382F90"600
TXT"swisssign-check=IzRWE0bcteiO-EIlZviFPibO5AI"600
TXT"v=spf1 ip4:185.98.184.0/24 ip4:80.82.206.0/26 include:pzd-svn.de -all"600
TXT"apple-domain-verification=cT1ZO3SUsSFsu077"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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