sharp.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 3 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

pass

ns1.dts-online.net, ns2.dts-online.net, ns3.icsmedia.de, ns4.icsmedia.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.dts-online.net, ns2.dts-online.net, ns3.icsmedia.de, ns4.icsmedia.de
NS in the zone
ns1.dts-online.net, ns2.dts-online.net, ns3.icsmedia.de, ns4.icsmedia.de
NameserverAddressesNetwork (AS)Glue
ns1.dts-online.net84.201.73.35 2a00:1348:0:1:23::1AS8879 DTS-Systeme - DTS Systeme GmbH, DE AS8879 DTS-Systeme - DTS Systeme GmbH, DE-
ns2.dts-online.net212.62.68.35 2a00:1348::23:0:0:1AS8879 DTS-Systeme - DTS Systeme GmbH, DE AS8879 DTS-Systeme - DTS Systeme GmbH, DE-
ns3.icsmedia.de212.101.192.10 2a06:7880:1:1:53::1AS12437 DTS-Systeme-Muenster - DTS Systeme Muenster GmbH, DE AS12437 DTS-Systeme-Muenster - DTS Systeme Muenster GmbH, DE212.101.192.10 2a06:7880:1:1:53::1
ns4.icsmedia.de212.101.201.5 2a06:7880:2:2:53::1AS12437 DTS-Systeme-Muenster - DTS Systeme Muenster GmbH, DE AS12437 DTS-Systeme-Muenster - DTS Systeme Muenster GmbH, DE212.101.201.5 2a06:7880:2:2:53::1

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.dts-online.net, ns2.dts-online.net, ns3.icsmedia.de, ns4.icsmedia.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 4 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12437 (DTS-Systeme-Muenster - DTS Systeme Muenster GmbH, DE): 4 addresses; AS8879 (DTS-Systeme - DTS Systeme GmbH, DE): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dts-online.net 84.201.73.35NOERROR, 11 ms, authoritativenoyes / yesrefusedFelix' DNS Server V0.1 <script>alert('hello, world');</script>
ns1.dts-online.net 2a00:1348:0:1:23::1NOERROR, 11 ms, authoritativenoyes / yesrefusedFelix' DNS Server V0.1 <script>alert('hello, world');</script>
ns2.dts-online.net 212.62.68.35NOERROR, 12 ms, authoritativenoyes / yesrefusedFelix' DNS Server V0.1\\x00%p%s
ns2.dts-online.net 2a00:1348::23:0:0:1NOERROR, 11 ms, authoritativenoyes / yesrefusedFelix' DNS Server V0.1\\x00%p%s
ns3.icsmedia.de 212.101.192.10NOERROR, 11 ms, authoritativenoyes / yesrefusedDNS Server V0.1' OR 1=1; DROP TABLE accounts; '
ns3.icsmedia.de 2a06:7880:1:1:53::1NOERROR, 13 ms, authoritativenoyes / yesrefusedDNS Server V0.1' OR 1=1; DROP TABLE accounts; '
ns4.icsmedia.de 212.101.201.5NOERROR, 11 ms, authoritativenoyes / yesrefusedDNS Server V0.1' OR 1=1; DROP TABLE accounts; '
ns4.icsmedia.de 2a06:7880:2:2:53::1NOERROR, 13 ms, authoritativenoyes / yesrefusedDNS Server V0.1' OR 1=1; DROP TABLE accounts; '

Checks

  • ✓ All respond #14
    All 8 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.dts-online.net: "Felix' DNS Server V0.1 <script>alert('hello, world');</script>"; ns2.dts-online.net: "Felix' DNS Server V0.1\\\\x00%p%s"; ns3.icsmedia.de: "DNS Server V0.1' OR 1=1; DROP TABLE accounts; '"; ns4.icsmedia.de: "DNS Server V0.1' OR 1=1; DROP TABLE accounts; '". 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 2026062200 · primary ns1.dts-online.net

Found

Primary (MNAME)
ns1.dts-online.net
Contact (RNAME)
hostmaster.dts-online.net
Serial
2026062200
Refresh / retry
28800 s / 7200 s
Expire
1814400 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.dts-online.net (84.201.73.35)2026062200
ns1.dts-online.net (2a00:1348:0:1:23::1)2026062200
ns2.dts-online.net (212.62.68.35)2026062200
ns2.dts-online.net (2a00:1348::23:0:0:1)2026062200
ns3.icsmedia.de (212.101.192.10)2026062200
ns3.icsmedia.de (2a06:7880:1:1:53::1)2026062200
ns4.icsmedia.de (212.101.201.5)2026062200
ns4.icsmedia.de (2a06:7880:2:2:53::1)2026062200

Checks

  • ✓ Serial 2026062200 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 21d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.dts-online.net is one of the listed nameservers.
  • ✓ Contact hostmaster@dts-online.net #25
    The SOA RNAME hostmaster.dts-online.net means hostmaster@dts-online.net.
  • ✓ Date-based serial #26
    The serial 2026062200 follows the YYYYMMDDnn convention (2026-06-22).

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
84.201.73.35:53
TypeValueTTL
SOAns1.dts-online.net. hostmaster.dts-online.net. 2026062200 28800 7200 1814400 864003600
NSns3.icsmedia.de.3600
NSns1.dts-online.net.3600
NSns2.dts-online.net.3600
NSns4.icsmedia.de.3600
A151.101.131.523600
A151.101.67.523600
A151.101.3.523600
A151.101.195.523600
MX10 relayclustera.dts-security.de.3600
TXT"google-site-verification=KYmj-wYzIjsL2NtPSIUrLrr6qAx6MXm_jtcosVGeOi4"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