medi.de

Checked 21 October 2026, 23:21 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

ns0.tmt.de, ns4.tmt.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns0.tmt.de, ns4.tmt.de
NS in the zone
ns0.tmt.de, ns4.tmt.de
NameserverAddressesNetwork (AS)Glue
ns0.tmt.de217.145.97.43 2001:4dc8:100:3::97:43AS16316 TMT - TMT GmbH & Co. KG, DE AS16316 TMT - TMT GmbH & Co. KG, DE217.145.97.43 2001:4dc8:100:3::97:43
ns4.tmt.de217.145.99.3 2001:4dc8:100::99:3AS16316 TMT - TMT GmbH & Co. KG, DE AS16316 TMT - TMT GmbH & Co. KG, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns0.tmt.de, ns4.tmt.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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:4dc8:100::/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 (AS16316 (TMT - TMT GmbH & Co. KG, 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
ns0.tmt.de 217.145.97.43NOERROR, 15 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns0.tmt.de 2001:4dc8:100:3::97:43NOERROR, 15 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns4.tmt.de 217.145.99.3NOERROR, 15 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns4.tmt.de 2001:4dc8:100::99:3NOERROR, 15 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian

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: ns0.tmt.de: "9.18.49-1~deb12u2-Debian"; ns4.tmt.de: "9.18.49-1~deb12u2-Debian". 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 2023081468 · primary ns0.tmt.de

Found

Primary (MNAME)
ns0.tmt.de
Contact (RNAME)
hostmaster.ns0.tmt.de
Serial
2023081468
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns0.tmt.de (217.145.97.43)2023081468
ns0.tmt.de (2001:4dc8:100:3::97:43)2023081468
ns4.tmt.de (217.145.99.3)2023081468
ns4.tmt.de (2001:4dc8:100::99:3)2023081468

Checks

  • ✓ Serial 2023081468 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns0.tmt.de is one of the listed nameservers.
  • ✓ Contact hostmaster@ns0.tmt.de #25
    The SOA RNAME hostmaster.ns0.tmt.de means hostmaster@ns0.tmt.de.
  • ✓ Date-based serial #26
    The serial 2023081468 follows the YYYYMMDDnn convention (2023-08-14).

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

20 records at the apex

Found

Read from
217.145.97.43:53
TypeValueTTL
SOAns0.tmt.de. hostmaster.ns0.tmt.de. 2023081468 28800 7200 604800 360086400
NSns4.tmt.de.3600
NSns0.tmt.de.3600
A3.74.128.21786400
MX10 medi-de.mail.protection.outlook.com.3600
TXT"MS=ms74109097"600
TXT"d365mktkey=HOruwhYU5bMx8JqxaKyTnxk8rElhRkL5lLzaewWvjHgx"600
TXT"d365mktkey=IbeTRIZxLusK4RDDIqW2PU8msWE83DyxSh1hxwKZLAcx"600
TXT"d365mktkey=obYXeoyH4JezTYqJbfNqq3pz9zWxPJrszXYtGxCT6rAx"600
TXT"mgverify=7fade0f55fda1a6e2bacae178c408fac5c4bac4c9b263cb18f83862396ec6fab"600
TXT"MS=ms86223699"600
TXT"apple-domain-verification=869CAfPGpUjKziSy"600
TXT"bw=SqCAtRQXqihWmTfH5MKxcuHWNj4YsMl2IjvimefgEOmI"600
TXT"mindmanager-verification=496340ac78217783393ccce69c5389f582ac3bc68399c17860df19275c9b9722"600
TXT"d365mktkey=Q9zUaxyQx3faiVs6qgxrv2D3NzI0xpyZN5BVBf5L7mwx"600
TXT"nitro-verification-code=LTg4ODQ5OTkwNTM1MTAxNjY1NDE="600
TXT"Dynatrace-site-verification=24de6e55-dd28-4e38-9192-02317a15b745__oi1irblve8m8bmp4k30e3lu6tl"600
TXT"d365mktkey=mINHxkUxtURAWnkN0O7eJIXpzk8sKdlJ3pRjz0qUd1kx"600
TXT"9KRahnODcGGPkj+kXws6vnXMVAG18YSwZ5anhZnNo2vYPUPEyqXXH34dCL+FlR8NONZUkr1Q38Cl7KTWQORkqg=="600
TXT"v=spf1 include:spf.protection.outlook.com include:spfrecord.medi.de include:spf.mailjet.com include:_spf.zimpel.de -all"600

Checks

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