rietveldacademie.nl

Checked 22 October 2026, 15:41 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 7 info

Registration

info

.nl country-code

Found

TLD
.nl (country-code)
ICANN policies apply
no
Lookup error: https://rdap.sidn.nl/domain/rietveldacademie.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/rietveldacademie.nl returned HTTP 429
    #3

Delegation

info

ns.webtic.nl, ns2.webtic.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns.webtic.nl, ns2.webtic.nl
NS in the zone
ns.webtic.nl, ns2.webtic.nl
NameserverAddressesNetwork (AS)Glue
ns.webtic.nl167.235.140.123 2a01:4f8:1c1b:4504::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns2.webtic.nl91.107.146.120 2a01:4f8:1c1e:af6d::1AS24940 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: ns.webtic.nl, ns2.webtic.nl.
    #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 .nl
    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
ns.webtic.nl 167.235.140.123NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.3
ns.webtic.nl 2a01:4f8:1c1b:4504::1NOERROR, 2 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.3
ns2.webtic.nl 91.107.146.120NOERROR, 1 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.3
ns2.webtic.nl 2a01:4f8:1c1e:af6d::1NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.3

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: ns.webtic.nl: "PowerDNS Authoritative Server 4.8.3"; ns2.webtic.nl: "PowerDNS Authoritative Server 4.8.3". 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 2025022720 · primary ns.webtic.nl

Found

Primary (MNAME)
ns.webtic.nl
Contact (RNAME)
hostmaster.webtic.nl
Serial
2025022720
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.webtic.nl (167.235.140.123)2025022720
ns.webtic.nl (2a01:4f8:1c1b:4504::1)2025022720
ns2.webtic.nl (91.107.146.120)2025022720
ns2.webtic.nl (2a01:4f8:1c1e:af6d::1)2025022720

Checks

  • ✓ Serial 2025022720 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.webtic.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@webtic.nl #25
    The SOA RNAME hostmaster.webtic.nl means hostmaster@webtic.nl.
  • ✓ Date-based serial #26
    The serial 2025022720 follows the YYYYMMDDnn convention (2025-02-27).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
6982ECDSAP256SHA256 (13)SHA256 22D5D7F5BA49F413…yes

DNSKEY in the zone

Key tagRoleAlgorithm
6982KSK (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 6982 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-05 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 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

10 records at the apex

Found

Read from
167.235.140.123:53
TypeValueTTL
SOAns.webtic.nl. hostmaster.webtic.nl. 2025022720 28800 7200 604800 864003600
NSns.webtic.nl.3600
NSns2.webtic.nl.3600
A83.98.140.233600
AAAA2001:16f8:4::233600
MX0 rietveldacademie-nl.mail.protection.outlook.com.3600
TXT"v=DKIM1;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCwoba/9e6eSgio64RUDfs6bjPnnuZhiWUVlRY0YSaL6E3POuTll0tx2tGPSV8yfoTp+w/VvGvcIERn2MRwBoFQ/lMKSRk69u7pviqC7FqrYc4qT20UFdVnrlzWFe3LvPA5QTKLN5GqcAWN8IOuthAunIHBjMWoGaxLVC+OvHO5kQIDAQAB;s=email"3600
TXT"apple-domain-verification=Kn7EZYfueOcaxXmu"3600
TXT"MS=ms66237511"3600
TXT"v=spf1 ip4:88.211.133.194 ip4:194.107.121.2 ip4:94.143.211.206 include:spf.mailinglijst.nl include:spf.datab.nl include:spf.interconnect.nl include:spf.protection.outlook.com include:spf.topdesk.net include:spf.mailjet.com -all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 1h, NS 1h.
  • ✓ 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