rtvdordrecht.nl

Checked 22 October 2026, 15:50 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 8 info

Registration

info

.nl country-code

Found

TLD
.nl (country-code)
ICANN policies apply
no
Lookup error: https://rdap.sidn.nl/domain/rtvdordrecht.nl returned HTTP 429

Checks

  • i
    .nl 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
    .nl is delegated in the root zone and DNSSEC-signed.
  • i
    Could not be checked
    The RDAP lookup failed, so this could not be checked: https://rdap.sidn.nl/domain/rtvdordrecht.nl returned HTTP 429
    #3

Delegation

info

ns1.middelkoop.cc, ns2.middelkoop.cc

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns1.middelkoop.cc, ns2.middelkoop.cc
NS in the zone
ns1.middelkoop.cc, ns2.middelkoop.cc
NameserverAddressesNetwork (AS)Glue
ns1.middelkoop.cc168.119.0.137 2a01:4f8:242:4baa::2AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns2.middelkoop.cc88.198.52.228 2a01:4f8:221:4358::2AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.middelkoop.cc, ns2.middelkoop.cc.
    #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 different networks #10
    The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS24940 (HETZNER-AS - Hetzner Online GmbH, 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 .cc
    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
ns1.middelkoop.cc 168.119.0.137NOERROR, 4 ms, authoritativenoyes / yesrefused9.18.33
ns1.middelkoop.cc 2a01:4f8:242:4baa::2NOERROR, 4 ms, authoritativenoyes / yesrefused9.18.33
ns2.middelkoop.cc 88.198.52.228NOERROR, 5 ms, authoritativenoyes / yesrefused9.18.33
ns2.middelkoop.cc 2a01:4f8:221:4358::2NOERROR, 4 ms, authoritativenoyes / yesrefused9.18.33

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: ns1.middelkoop.cc: "9.18.33"; ns2.middelkoop.cc: "9.18.33". 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 0 · primary ns1.middelkoop.cc

Found

Primary (MNAME)
ns1.middelkoop.cc
Contact (RNAME)
webmaster.rtvdordrecht.nl
Serial
0
Refresh / retry
14400 s / 3600 s
Expire
1209600 s
Negative TTL
43200 s

Serial per nameserver

NameserverSerial
ns1.middelkoop.cc (168.119.0.137)0
ns1.middelkoop.cc (2a01:4f8:242:4baa::2)0
ns2.middelkoop.cc (88.198.52.228)0
ns2.middelkoop.cc (2a01:4f8:221:4358::2)0

Checks

  • ✓ Serial 0 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 14d, negative TTL 12h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.middelkoop.cc is one of the listed nameservers.
  • ✓ Contact webmaster@rtvdordrecht.nl #25
    The SOA RNAME webmaster.rtvdordrecht.nl means webmaster@rtvdordrecht.nl.
  • ✓ Counter serial #26
    The serial 0 is a plain counter.

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
20 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
26225ECDSAP256SHA256 (13)SHA256 0FA2EDF3D16FD81A…yes
38510ECDSAP256SHA256 (13)SHA256 70BCFD56EBFE8D53…yes

DNSKEY in the zone

Key tagRoleAlgorithm
38510ZSK (256)ECDSAP256SHA256 (13)
26225KSK (257)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 26225 (SHA256), key tag 38510 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-20 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-20 22:26 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

8 records at the apex

Found

Read from
168.119.0.137:53
TypeValueTTL
SOAns1.middelkoop.cc. webmaster.rtvdordrecht.nl. 0 14400 3600 1209600 4320043200
NSns1.middelkoop.cc.43200
NSns2.middelkoop.cc.43200
A85.10.138.21643200
AAAA2a01:7c8:bb0b:587:5054:ff:feac:83e943200
MX10 middelkoop.cc.43200
TXT"v=spf1 include:spf.middelkoop.cc a:thuiswerken.rtvdordrecht.nl include:_spf.exonet.nl include:servers.mcsv.net -all"43200
TXT"google-site-verification=XzUX9QcTnrhXZrwXEwvmq93HhlJ3gWEo4bhVG0CzLfs"43200

Checks

  • ✓ TTLs within range #32
    TTLs: A 12h, AAAA 12h, MX 12h, NS 12h. The NS TTL at the parent is 1h and in the zone 12h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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