cottbus.de

Checked 21 October 2026, 22:11 UTC · via 8.8.8.8
✗Problems found
22 passed 2 warnings 1 failed 4 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

pns.dtag.de, pns.pbitnet.de, secondary006.dtag.net, sns.pbitnet.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
pns.dtag.de, pns.pbitnet.de, secondary006.dtag.net, sns.pbitnet.de
NS in the zone
pns.dtag.de, pns.pbitnet.de, secondary006.dtag.net, sns.pbitnet.de
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
pns.pbitnet.de87.191.53.201AS3320 DTAG - Deutsche Telekom AG, DE87.191.53.201
secondary006.dtag.net195.244.245.25 2a00:fa8:3:0:100:0:6:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-
sns.pbitnet.de87.191.53.202AS3320 DTAG - Deutsche Telekom AG, DE87.191.53.202

Checks

  • ✓ 4 nameservers #6
    Delegated to pns.dtag.de, pns.pbitnet.de, secondary006.dtag.net, sns.pbitnet.de.
  • ✓ 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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS3320 (DTAG - Deutsche Telekom AG, DE): 4 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: pns.pbitnet.de, sns.pbitnet.de.
    #13

Nameservers

fail

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pns.dtag.de 194.25.0.125NOERROR, 10 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.pbitnet.de 87.191.53.201NOERROR, 15 ms, authoritativenoyes / yesrefusedunknown
secondary006.dtag.net 195.244.245.25NOERROR, 15 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary006.dtag.net 2a00:fa8:3:0:100:0:6:1NOERROR, 18 ms, authoritativenoyes / yesrefusedDomainNameServer
sns.pbitnet.de 87.191.53.202NOERROR, 15 ms, authoritativeOPENyes / yesrefused9.18.30-0ubuntu0.20.04.2-Ubuntu

Checks

  • ✓ All respond #14
    All 6 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✗
    Open recursion
    These nameservers resolve names for anyone, which makes them usable for DNS amplification attacks and cache poisoning: sns.pbitnet.de (87.191.53.202). Disable recursion on authoritative servers.
    #16
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: sns.pbitnet.de: "9.18.30-0ubuntu0.20.04.2-Ubuntu". 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 2026100601 · primary pns.pbitnet.de

Found

Primary (MNAME)
pns.pbitnet.de
Contact (RNAME)
webmaster.default.tld
Serial
2026100601
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
pns.dtag.de (194.25.0.125)2026100601
pns.dtag.de (2003:40:8000::100)2026100601
pns.pbitnet.de (87.191.53.201)2026100601
secondary006.dtag.net (195.244.245.25)2026100601
secondary006.dtag.net (2a00:fa8:3:0:100:0:6:1)2026100601
sns.pbitnet.de (87.191.53.202)2026100601

Checks

  • ✓ Serial 2026100601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver pns.pbitnet.de is one of the listed nameservers.
  • ✓ Contact webmaster@default.tld #25
    The SOA RNAME webmaster.default.tld means webmaster@default.tld.
  • ✓ Date-based serial #26
    The serial 2026100601 follows the YYYYMMDDnn convention (2026-10-06).

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
SOApns.pbitnet.de. webmaster.default.tld. 2026100601 14400 3600 604800 864003600
NSpns.dtag.de.3600
NSsns.pbitnet.de.3600
NSpns.pbitnet.de.3600
NSsecondary006.dtag.net.3600
A142.132.132.100600
MX10 mail.cottbus.de.3600
TXT"03.09.2026"3600
TXT"MS=0DC2F35F57032FF380B280214F02F1CFF6F4C14D"3600
TXT"brevo-code:fabae4f3a96a8ff8ca9a9f0c43565cbd"3600
TXT"v=spf1 ip4:80.148.29.199 ip4:80.148.29.200 -all"3600
TXT"google-site-verification=1nrofReXxcNaH737sV7hgVTDCeMEIb4PUpXYP6ZCSro"3600

Checks

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