ndt.nl

Checked 22 October 2026, 14:41 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 5 info

Registration

info

.nl country-code

Found

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

Delegation

warn

ns.zxcs.be, ns.zxcs.eu, ns.zxcs.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns.zxcs.be, ns.zxcs.eu, ns.zxcs.nl
NS in the zone
ns.zxcs.eu, ns.zxcs.nl
NameserverAddressesNetwork (AS)Glue
ns.zxcs.be (parent only)46.101.179.64 2a03:b0c0:3:d0::116:2001AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US-
ns.zxcs.eu178.62.208.8 2a03:b0c0:2:d0::57:1001AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US-
ns.zxcs.nl185.104.28.19 2a06:2ec0:1::10AS206281 AS-ZXCS - Stichting DIGI NL, NL AS206281 AS-ZXCS - Stichting DIGI NL, NL-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.zxcs.be, ns.zxcs.eu, ns.zxcs.nl.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns.zxcs.be. ns.zxcs.be, ns.zxcs.eu, ns.zxcs.nl report NS ns.zxcs.eu ns.zxcs.nl.
    #7
  • ✓ 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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS14061 (DIGITALOCEAN-ASN - DigitalOcean, LLC, US): 4 addresses; AS206281 (AS-ZXCS - Stichting DIGI NL, NL): 2 addresses.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .be, .eu, .nl.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.zxcs.be 46.101.179.64NOERROR, 15 ms, authoritativenoyes / yesrefusedUnknown
ns.zxcs.be 2a03:b0c0:3:d0::116:2001NOERROR, 14 ms, authoritativenoyes / yesrefusedUnknown
ns.zxcs.eu 178.62.208.8NOERROR, 11 ms, authoritativenoyes / yesrefusedUnknown
ns.zxcs.eu 2a03:b0c0:2:d0::57:1001NOERROR, 12 ms, authoritativenoyes / yesrefusedUnknown
ns.zxcs.nl 185.104.28.19NOERROR, 14 ms, authoritativenoyes / yesrefusedUnknown
ns.zxcs.nl 2a06:2ec0:1::10NOERROR, 14 ms, authoritativenoyes / yesrefusedUnknown

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.zxcs.be: "Unknown"; ns.zxcs.eu: "Unknown"; ns.zxcs.nl: "Unknown".
    #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 2026092300 · primary ns.zxcs.eu

Found

Primary (MNAME)
ns.zxcs.eu
Contact (RNAME)
hostmaster.ndt.nl
Serial
2026092300
Refresh / retry
600 s / 3600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.zxcs.be (46.101.179.64)2026092300
ns.zxcs.be (2a03:b0c0:3:d0::116:2001)2026092300
ns.zxcs.eu (178.62.208.8)2026092300
ns.zxcs.eu (2a03:b0c0:2:d0::57:1001)2026092300
ns.zxcs.nl (185.104.28.19)2026092300
ns.zxcs.nl (2a06:2ec0:1::10)2026092300

Checks

  • ✓ Serial 2026092300 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 10m is outside 20m–1d; retry 1h should be shorter than refresh 10m. Current values: refresh 10m, retry 1h, expire 14d, negative TTL 1d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.zxcs.eu is one of the listed nameservers.
  • ✓ Contact hostmaster@ndt.nl #25
    The SOA RNAME hostmaster.ndt.nl means hostmaster@ndt.nl.
  • ✓ Date-based serial #26
    The serial 2026092300 follows the YYYYMMDDnn convention (2026-09-23).

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
38416ECDSAP256SHA256 (13)SHA256 08781AD6BF905F85…yes

DNSKEY in the zone

Key tagRoleAlgorithm
38416KSK (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 38416 (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

15 records at the apex

Found

Read from
46.101.179.64:53
TypeValueTTL
SOAns.zxcs.eu. hostmaster.ndt.nl. 2026092300 600 3600 1209600 86400600
NSns.zxcs.eu.300
NSns.zxcs.nl.300
A149.210.244.189300
AAAA2a01:7c8:aabb:ea:5054:ff:fe5a:73a6300
MX0 ndt-nl.mail.protection.outlook.com.300
TXT"facebook-domain-verification=48a9qcemlksgq5p4wi40rq5m5dqjdo"300
TXT"MS=18B780A93A6B8BBFC7D384F2EB97801DAFAEB2FE"300
TXT"google-site-verification=G2JjaVWOBoDBDX8Ytb12ER_MmULz9BHKQn96HQZdi3A"300
TXT"d365mktkey=cMl5sHEAYUxRuLQgNB9SD0YRt5mr4LImQyAbppgiDGQx"300
TXT"facebook-domain-verification=34e7a9wiqcb07rnvjdkcr33p3qx27r"300
TXT"d365mktkey=OZGnMOyxa8amY34mRr0840dpcxmvbE3EZinrUbizpJIx"300
TXT"d365mktkey=lUViYylls6xF3AIJOwpgXY7E0xb0BlFHidVopbhaLk4x"300
TXT"WD"300
TXT"v=spf1 include:spf.protection.outlook.com include:_spf.eu.sparkpostmail.com include:_spf.hostnet.nl include:_spf.formulierenserver.nl a:outbound-mail" ".uurwerk.net include:shops.shopify.com ip4:185.46.182.1 ip4:185.46.182.200/29 ip4:185.46.182.208/31 -all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 5m. The NS TTL at the parent is 1h and in the zone 5m; 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