muelheim-ruhr.de

Checked 21 October 2026, 23:30 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

warn

ns01.versatel.de, ns02.versatel.de, ns03.versatel.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns01.versatel.de, ns02.versatel.de, ns03.versatel.de
NS in the zone
ns01.versatel.de, ns02.versatel.de, ns03.versatel.de
NameserverAddressesNetwork (AS)Glue
ns01.versatel.de212.7.128.162AS8881 VERSATEL - 1&1 Versatel GmbH, DE212.7.128.162
ns02.versatel.de212.7.128.165AS8881 VERSATEL - 1&1 Versatel GmbH, DE212.7.128.165
ns03.versatel.de193.219.15.17AS8881 VERSATEL - 1&1 Versatel GmbH, DE193.219.15.17

Checks

  • ✓ 3 nameservers #6
    Delegated to ns01.versatel.de, ns02.versatel.de, ns03.versatel.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 2 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS8881 (VERSATEL - 1&1 Versatel GmbH, DE): 3 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.versatel.de 212.7.128.162NOERROR, 16 ms, authoritativenoyes / yesrefusedNo version info available (refused).
ns02.versatel.de 212.7.128.165NOERROR, 18 ms, authoritativenoyes / yesrefusedNo version info available (refused).
ns03.versatel.de 193.219.15.17NOERROR, 12 ms, authoritativenoyes / yesrefusedNo version info available (refused).

Checks

  • ✓ All respond #14
    All 3 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: ns01.versatel.de: "No version info available (refused)."; ns02.versatel.de: "No version info available (refused)."; ns03.versatel.de: "No version info available (refused).".
    #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 2026100500 · primary ns01.versatel.de

Found

Primary (MNAME)
ns01.versatel.de
Contact (RNAME)
hostmaster.versatel.de
Serial
2026100500
Refresh / retry
86400 s / 28800 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns01.versatel.de (212.7.128.162)2026100500
ns02.versatel.de (212.7.128.165)2026100500
ns03.versatel.de (193.219.15.17)2026100500

Checks

  • ✓ Serial 2026100500 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 8h, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.versatel.de is one of the listed nameservers.
  • ✓ Contact hostmaster@versatel.de #25
    The SOA RNAME hostmaster.versatel.de means hostmaster@versatel.de.
  • ✓ Date-based serial #26
    The serial 2026100500 follows the YYYYMMDDnn convention (2026-10-05).

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

18 records at the apex

Found

Read from
212.7.128.162:53
TypeValueTTL
SOAns01.versatel.de. hostmaster.versatel.de. 2026100500 86400 28800 3600000 86400600
NSns03.versatel.de.86400
NSns02.versatel.de.86400
NSns01.versatel.de.86400
A82.207.180.164600
MX10 mail.muelheim-ruhr.de.600
TXT"ZOOM_verify_OCMg9D2H1MjmUDyXT4mj3x"600
TXT"QuoVadis=1bf30178-225c-4be3-a8a0-3b3baea138e3"600
TXT"MS=EA44EC490E4684F2659147159CC0C034EDE1EFA3"600
TXT"QuoVadis=492f6875-4522-4698-8fb4-529869005572"600
TXT"google-site-verification=iLCN9PrEL06S2VxO9M9AU8PaqmiX1x5cyX-HGzUeJIs"600
TXT"MS=ms43765322"600
TXT"v=spf1 mx ip4:82.207.180.128/25 -all"600
TXT"google-site-verification=OgPP7qkVHkn2AoQmXvoRZkS96mGyoUD59MHkSgdroV0"600
TXT"QuoVadis=78fc6a60-41d1-4001-ae9d-31d70f955c5f"600
TXT"apple-domain-verification=RVR0zAI5bBtOZJ71"600
TXT"cisco-ci-domain-verification=52874acca276d1f8be23e0200fe4290079760eccec9f636193bc36038cec717f"600
TXT"apple-domain-verification=HhN61SrA50CXjWJJ"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, 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