campus.de

Checked 21 October 2026, 22:06 UTC · via 8.8.8.8
!Passed with warnings
19 passed 3 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

ns01.c-werke.de, ns02.c-werke.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns01.c-werke.de, ns02.c-werke.de
NS in the zone
ns01.c-werke.de, ns02.c-werke.de
NameserverAddressesNetwork (AS)Glue
ns01.c-werke.de87.238.187.11 2a02:8c0:10::bAS39257 INC - LUMi GmbH, DE AS39257 INC - LUMi GmbH, DE-
ns02.c-werke.de87.238.190.11 2a02:8c0:20::7AS39257 INC - LUMi GmbH, DE AS39257 INC - LUMi GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns01.c-werke.de, ns02.c-werke.de.
    #6
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS39257 (INC - LUMi GmbH, DE): 4 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.c-werke.de 87.238.187.11NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.3
ns01.c-werke.de 2a02:8c0:10::bNOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.3
ns02.c-werke.de 87.238.190.11NOERROR, 6 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.3
ns02.c-werke.de 2a02:8c0:20::7NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.3

Checks

  • ✓ All respond #14
    All 4 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: ns01.c-werke.de: "PowerDNS Authoritative Server 4.5.3"; ns02.c-werke.de: "PowerDNS Authoritative Server 4.5.3". 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

warn

serial 2026101501 · primary ns01.fra.de.cwerke.net

Found

Primary (MNAME)
ns01.fra.de.cwerke.net
Contact (RNAME)
matijevic.campus.de
Serial
2026101501
Refresh / retry
86400 s / 7200 s
Expire
3600000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns01.c-werke.de (87.238.187.11)2026101501
ns01.c-werke.de (2a02:8c0:10::b)2026101501
ns02.c-werke.de (87.238.190.11)2023082102
ns02.c-werke.de (2a02:8c0:20::7)2023082102

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2023082102 on ns02.c-werke.de (87.238.190.11), ns02.c-werke.de (2a02:8c0:20::7); 2026101501 on ns01.c-werke.de (87.238.187.11), ns01.c-werke.de (2a02:8c0:10::b). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 1000h, negative TTL 1h.
  • i
    Hidden master
    The primary nameserver ns01.fra.de.cwerke.net 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 matijevic@campus.de #25
    The SOA RNAME matijevic.campus.de means matijevic@campus.de.
  • ✓ Date-based serial #26
    The serial 2026101501 follows the YYYYMMDDnn convention (2026-10-15).

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
87.238.187.11:53
TypeValueTTL
SOAns01.fra.de.cwerke.net. matijevic.campus.de. 2026101501 86400 7200 3600000 36003600
NSns01.c-werke.de.3600
NSns02.c-werke.de.3600
A78.46.127.1263600
MX0 campus-de.mail.protection.outlook.com.3600
TXT"v=spf1 ip4:145.253.167.176/29 a:campus-live-hetzner1.saltation.de a:bouncing.eur.mail.campus.de include:spf.beltz-de.cloud.nospamproxy.com include:spf-de.emailsignatures365.com include:spf.protection.outlook.com -all"3600
TXT"MS=ms28818297"3600
TXT"_telesec-domain-validation=2020-06-08_q4IEZ3Wj8kKPjPtLlcWHOfZUjdUTBSbEItvhZja02VQFPfKytK"3600
TXT"d365mktkey=3MpkgkCxUrMjgx1b9yovTxTC4fAEwCzx9VXw5jG4rmcx"3600
TXT"uuScVk3OrW7XFUyUjgg4OI+OPjw544ZYsNVEfGA0/UE="3600

Checks

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