inter.de

Checked 21 October 2026, 23:00 UTC · via 8.8.8.8
!Passed with warnings
19 passed 4 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

ns1.inter-gruppe.eu, ns2.inter-gruppe.eu

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.inter-gruppe.eu, ns2.inter-gruppe.eu
NS in the zone
ns1.inter-gruppe.eu, ns2.inter-gruppe.eu
NameserverAddressesNetwork (AS)Glue
ns1.inter-gruppe.eu213.109.144.52AS210333 inter-as - Inter Krankenversicherung AG, DE-
ns2.inter-gruppe.eu213.109.144.53AS210333 inter-as - Inter Krankenversicherung AG, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.inter-gruppe.eu, ns2.inter-gruppe.eu.
    #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 one network
    all IPv4 addresses are in 213.109.144.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS210333 (inter-as - Inter Krankenversicherung AG, DE): 2 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 .eu
    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

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.inter-gruppe.eu 213.109.144.52NOERROR, 5 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns2.inter-gruppe.eu 213.109.144.53NOERROR, 6 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian

Checks

  • ✓ All respond #14
    All 2 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: ns1.inter-gruppe.eu: "9.18.49-1~deb12u2-Debian"; ns2.inter-gruppe.eu: "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 2026091802 · primary ns1.inter-gruppe.eu

Found

Primary (MNAME)
ns1.inter-gruppe.eu
Contact (RNAME)
noc.inter.de
Serial
2026091802
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.inter-gruppe.eu (213.109.144.52)2026091802
ns2.inter-gruppe.eu (213.109.144.53)2026091802

Checks

  • ✓ Serial 2026091802 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.inter-gruppe.eu is one of the listed nameservers.
  • ✓ Contact noc@inter.de #25
    The SOA RNAME noc.inter.de means noc@inter.de.
  • ✓ Date-based serial #26
    The serial 2026091802 follows the YYYYMMDDnn convention (2026-09-18).

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

14 records at the apex

Found

Read from
213.109.144.52:53
TypeValueTTL
SOAns1.inter-gruppe.eu. noc.inter.de. 2026091802 10800 3600 604800 300300
NSns2.inter-gruppe.eu.300
NSns1.inter-gruppe.eu.300
A185.202.98.130300
AAAA2a11:6a40:1ff:2::2300
MX10 inter-de.mail.protection.outlook.com.300
TXT"google-site-verification=qBot7aiun08Qsd1R5goubGM19q9Bba0fPOdB6MVsp1k"300
TXT"anthropic-domain-verification-ec1669=dcQuaxPzhLT5uxCt6ZCq5L6sF"300
TXT"jamf-site-verification=cDrX-lDK4Ye3C7fjl74o_A"300
TXT"MS=ms89885595"300
TXT"miro-verification=e8efc1d44728754441bb31e8e7a5308290c86a86"300
TXT"apple-domain-verification=rspUdK7h0erBbp6n"300
TXT"facebook-domain-verification=p4hy42dpl32b7gj41cnymkpiegxxxn"300
TXT"v=spf1 mx ip4:212.34.64.185 ip4:185.202.98.162 ip4:185.202.98.163 include:spf.protection.outlook.com -all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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