schwarz-digits.de

Checked 22 October 2026, 00:02 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 warnings 0 failed 5 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

ns.do-ex.com, ns.do-ex.net, ns.do-ex.org

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.do-ex.com, ns.do-ex.net, ns.do-ex.org
NS in the zone
ns.do-ex.com, ns.do-ex.net, ns.do-ex.org
NameserverAddressesNetwork (AS)Glue
ns.do-ex.com193.227.117.225 2a04:2b00:14cc::225AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns.do-ex.net194.50.187.225 2a04:2b00:14dd::225AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns.do-ex.org194.0.182.225 2a04:2b00:14ee::225AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.do-ex.com, ns.do-ex.net, ns.do-ex.org.
  • ✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .com, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.do-ex.com 193.227.117.225NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns.do-ex.com 2a04:2b00:14cc::225NOERROR, 8 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns.do-ex.net 194.50.187.225NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
ns.do-ex.net 2a04:2b00:14dd::225NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns.do-ex.org 194.0.182.225NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns.do-ex.org 2a04:2b00:14ee::225NOERROR, 8 ms, authoritativenoyes / yesrefusedRcodeZero DNS

Checks

  • ✓ All respond #14
    All 6 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: ns.do-ex.com: "RcodeZero DNS"; ns.do-ex.net: "reg-wie1"; ns.do-ex.org: "RcodeZero DNS".
    #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 2026090901 · primary ns.do-ex.com

Found

Primary (MNAME)
ns.do-ex.com
Contact (RNAME)
tech.domainexperten.de
Serial
2026090901
Refresh / retry
86400 s / 7200 s
Expire
3600000 s
Negative TTL
172800 s

Serial per nameserver

NameserverSerial
ns.do-ex.com (193.227.117.225)2026090901
ns.do-ex.com (2a04:2b00:14cc::225)2026090901
ns.do-ex.net (194.50.187.225)2026090901
ns.do-ex.net (2a04:2b00:14dd::225)2026090901
ns.do-ex.org (194.0.182.225)2026090901
ns.do-ex.org (2a04:2b00:14ee::225)2026090901

Checks

  • ✓ Serial 2026090901 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 2d is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1d, retry 2h, expire 1000h, negative TTL 2d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.do-ex.com is one of the listed nameservers.
  • ✓ Contact tech@domainexperten.de #25
    The SOA RNAME tech.domainexperten.de means tech@domainexperten.de.
  • ✓ Date-based serial #26
    The serial 2026090901 follows the YYYYMMDDnn convention (2026-09-09).

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

warn

12 records at the apex

Found

Read from
193.227.117.225:53
TypeValueTTL
SOAns.do-ex.com. tech.domainexperten.de. 2026090901 86400 7200 3600000 1728003600
NSns.do-ex.com.3600
NSns.do-ex.net.3600
NSns.do-ex.org.3600
A2.17.100.12860
A2.17.100.14560
MX0 schwarzdigits-de01i.mail.protection.outlook.com.3600
TXT"MS=ms15708068"3600
TXT"v=spf1 include:_spfg.mail.schwarz -all"3600
TXT"d365mktkey=6oZ5sxMGpMAcseuANfnqirdYTM3kyO4454epfdjfQYkx"3600
TXT"linkedin-site-verification=1e4851f6-7123-4054-a75d-9f6868d1baa1"3600
TXT"google-site-verification=jERXm-VlfegjjDFGdsODfKLGD_M0B10gZikhxR5QUg8"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
    #32
  • ✓ 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