bzaek.de

Checked 21 October 2026, 22:04 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

sl5.sldomains.de, sl7.sldomains.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
sl5.sldomains.de, sl7.sldomains.de
NS in the zone
sl5.sldomains.de, sl7.sldomains.de
NameserverAddressesNetwork (AS)Glue
sl5.sldomains.de82.141.39.246AS8648 ONE-NETWORK - dogado GmbH, DE82.141.39.246
sl7.sldomains.de82.141.39.251AS8648 ONE-NETWORK - dogado GmbH, DE82.141.39.251

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: sl5.sldomains.de, sl7.sldomains.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 one network
    all IPv4 addresses are in 82.141.39.0/24. 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 (AS8648 (ONE-NETWORK - dogado GmbH, 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 .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

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
sl5.sldomains.de 82.141.39.246NOERROR, 13 ms, authoritativenoyes / yesrefusedv1.03i
sl7.sldomains.de 82.141.39.251NOERROR, 13 ms, authoritativenoyes / yesrefusedv1.03i

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: sl5.sldomains.de: "v1.03i"; sl7.sldomains.de: "v1.03i". 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 2026052600 · primary sl5.sldomains.de

Found

Primary (MNAME)
sl5.sldomains.de
Contact (RNAME)
admin.sldomains.de
Serial
2026052600
Refresh / retry
3600 s / 900 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
sl5.sldomains.de (82.141.39.246)2026052600
sl7.sldomains.de (82.141.39.251)2026052600

Checks

  • ✓ Serial 2026052600 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver sl5.sldomains.de is one of the listed nameservers.
  • ✓ Contact admin@sldomains.de #25
    The SOA RNAME admin.sldomains.de means admin@sldomains.de.
  • ✓ Date-based serial #26
    The serial 2026052600 follows the YYYYMMDDnn convention (2026-05-26).

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

11 records at the apex

Found

Read from
82.141.39.246:53
TypeValueTTL
SOASL5.SLDOMAINS.DE. ADMIN.SLDOMAINS.DE. 2026052600 3600 900 1209600 36003600
NSSL5.SLDOMAINS.DE.3600
NSSL7.SLDOMAINS.DE.3600
A134.119.224.873600
MX0 bzaek-de.mail.protection.outlook.com.3600
TXT"v=spf1 include:spf.protection.outlook.com ip4:212.91.225.100 include:spf-de.emailsignatures365.com -all"3600
TXT"_globalsign-domain-verification=qPgF5GTVBH_xwf-b6bFFgQjZ9bn1O9hgYmSiOuPQ2v"3600
TXT"google-site-verification=Y6BFJDR8tIlp4aButyHqxQ-DrCYlAkLTDNGmQbBH1eM"3600
TXT"MS=ms33770404"3600
TXT"MS=12E883DC5AE56D70BA6E1755843C83BE317530FA"3600
TXT"dsaqkppa6q5kp46cgdhi205po7"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