unesco.nl

Checked 22 October 2026, 16:50 UTC · via 8.8.8.8
iAll checks passed
28 passed 0 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/unesco.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/unesco.nl returned HTTP 429
    #3

Delegation

info

ns0.leaseweb.com, ns1.leaseweb.com

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns0.leaseweb.com, ns1.leaseweb.com
NS in the zone
ns0.leaseweb.com, ns1.leaseweb.com
NameserverAddressesNetwork (AS)Glue
ns0.leaseweb.com23.19.196.53 2607:f5b5::53AS7203 LEASEWEB-USA-SFO - Leaseweb USA, Inc., US AS28753 LEASEWEB-DE-FRA-10 - Leaseweb Deutschland GmbH, DE-
ns1.leaseweb.com23.19.197.53 2607:f5b5:1::53AS7203 LEASEWEB-USA-SFO - Leaseweb USA, Inc., US AS28753 LEASEWEB-DE-FRA-10 - Leaseweb Deutschland GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns0.leaseweb.com, ns1.leaseweb.com.
    #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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS28753 (LEASEWEB-DE-FRA-10 - Leaseweb Deutschland GmbH, DE): 2 addresses; AS7203 (LEASEWEB-USA-SFO - Leaseweb USA, Inc., US): 2 addresses.
  • i
    All nameserver names under .com
    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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns0.leaseweb.com 23.19.196.53NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns0.leaseweb.com 2607:f5b5::53NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1.leaseweb.com 23.19.197.53NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns1.leaseweb.com 2607:f5b5:1::53NOERROR, 4 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026030401 · primary ns0.leaseweb.com

Found

Primary (MNAME)
ns0.leaseweb.com
Contact (RNAME)
postmaster.leaseweb.com
Serial
2026030401
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns0.leaseweb.com (23.19.196.53)2026030401
ns0.leaseweb.com (2607:f5b5::53)2026030401
ns1.leaseweb.com (23.19.197.53)2026030401
ns1.leaseweb.com (2607:f5b5:1::53)2026030401

Checks

  • ✓ Serial 2026030401 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns0.leaseweb.com is one of the listed nameservers.
  • ✓ Contact postmaster@leaseweb.com #25
    The SOA RNAME postmaster.leaseweb.com means postmaster@leaseweb.com.
  • ✓ Date-based serial #26
    The serial 2026030401 follows the YYYYMMDDnn convention (2026-03-04).

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
9070ECDSAP256SHA256 (13)SHA256 337CF11C71AE673C…yes

DNSKEY in the zone

Key tagRoleAlgorithm
9070KSK (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 9070 (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

pass

17 records at the apex

Found

Read from
23.19.196.53:53
TypeValueTTL
SOAns0.leaseweb.com. postmaster.leaseweb.com. 2026030401 10800 3600 1209600 36003600
NSns0.leaseweb.com.3600
NSns1.leaseweb.com.3600
A185.73.34.33600
AAAA2a05:3f44::2:803600
MX0 filter.sliweb.nl.300
TXT"adobe-idp-site-verification=45bd9cf36a394b30e6e9bfe91846d58df5292e6ff7225064001a0a6a9dfd490b"300
TXT"cisco-ci-domain-verification=4ac0f62a70cd7444c9301925fcd25789dc4b4ceb96a5da06b1d5bd55a51a95b2"300
TXT"jkdFQ/q9qTN4rFhnmOsReI0z5ieY6WJ2V71a4QhySItgRIVLCFoKDRVavotEHnSKuJ5ThJU3/fILu/S9up5FSw=="300
TXT"MS=ms57628611"300
TXT"cisco-ci-domain-verification=1ed4b438c9a67decbd125403b7c2d484c23b3db47cedde0da39aff7475de6908"300
TXT"AdL0vre99gTmBjpvLPzGMWdjlQ2Fe9p"300
TXT"google-site-verification=vUFzaI5g6FnKsOpcH3cWVyLz6qXZyNwK5PIjR13km2w"300
TXT"v=spf1 a mx ip4:195.169.26.235 ip4:195.169.95.1 ip4:217.77.130.114 ip4:80.95.160.155 ip4:213.206.102.224/27 ip4:213.206.116.96/27 ip4:213.206.118.192/26 ip4:185.73.34.3 a:autodiscover.unesco.nl a:unesco.sliweb.nl a:filter.beveiligdweb.nl include:servers.m" "csv.net -all"300
CAA0 iodef "mailto:cert@nuffic.nl"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "sectigo.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 5m, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org, sectigo.com.