kennisnet.nl

Checked 21 October 2026, 21:22 UTC · via 8.8.8.8
iAll checks passed
30 passed 0 warnings 0 failed 3 info

Registration

info

.nl country-code

Found

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

Delegation

info

ns01.kennisnet.nl, ns02.kennisnet.nl, ns03.kennisnet.nl, ns04.kennisnet.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns01.kennisnet.nl, ns02.kennisnet.nl, ns03.kennisnet.nl, ns04.kennisnet.nl
NS in the zone
ns01.kennisnet.nl, ns02.kennisnet.nl, ns03.kennisnet.nl, ns04.kennisnet.nl
NameserverAddressesNetwork (AS)Glue
ns01.kennisnet.nl145.97.34.185 2001:610:2d8:484::34:185AS1145 Kennisnet-AS - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL145.97.34.185 2001:610:2d8:484::34:185
ns02.kennisnet.nl145.97.34.186 2001:610:2d8:484::34:186AS1145 Kennisnet-AS - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL145.97.34.186 2001:610:2d8:484::34:186
ns03.kennisnet.nl85.10.184.58 2a02:348:1200::266AS35470 XL-AS - Signet B.V., NL AS35470 XL-AS - Signet B.V., NL85.10.184.58 2a02:348:1200::266
ns04.kennisnet.nl85.10.187.79 2a02:348:1200::371AS35470 XL-AS - Signet B.V., NL AS35470 XL-AS - Signet B.V., NL85.10.187.79 2a02:348:1200::371

Checks

  • ✓ 4 nameservers #6
    Delegated to ns01.kennisnet.nl, ns02.kennisnet.nl, ns03.kennisnet.nl, ns04.kennisnet.nl.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns01.kennisnet.nl, ns02.kennisnet.nl, ns03.kennisnet.nl, ns04.kennisnet.nl.
  • ✓ 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 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 2 addresses; AS1145 (Kennisnet-AS - SURF B.V., NL): 2 addresses; AS35470 (XL-AS - Signet B.V., NL): 4 addresses.
  • 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

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.kennisnet.nl 145.97.34.185NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns01.kennisnet.nl 2001:610:2d8:484::34:185NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns02.kennisnet.nl 145.97.34.186NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns02.kennisnet.nl 2001:610:2d8:484::34:186NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns03.kennisnet.nl 85.10.184.58NOERROR, 37 ms, authoritativenoyes / yesrefused-
ns03.kennisnet.nl 2a02:348:1200::266NOERROR, 18 ms, authoritativenoyes / yesrefused-
ns04.kennisnet.nl 85.10.187.79NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns04.kennisnet.nl 2a02:348:1200::371NOERROR, 44 ms, authoritativenoyes / yesrefused-

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.
  • ✓ 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 2026101904 · primary ns01.kennisnet.nl

Found

Primary (MNAME)
ns01.kennisnet.nl
Contact (RNAME)
hostmaster.kennisnet.org
Serial
2026101904
Refresh / retry
3600 s / 900 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns01.kennisnet.nl (145.97.34.185)2026101904
ns01.kennisnet.nl (2001:610:2d8:484::34:185)2026101904
ns02.kennisnet.nl (145.97.34.186)2026101904
ns02.kennisnet.nl (2001:610:2d8:484::34:186)2026101904
ns03.kennisnet.nl (85.10.184.58)2026101904
ns03.kennisnet.nl (2a02:348:1200::266)2026101904
ns04.kennisnet.nl (85.10.187.79)2026101904
ns04.kennisnet.nl (2a02:348:1200::371)2026101904

Checks

  • ✓ Serial 2026101904 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.kennisnet.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@kennisnet.org #25
    The SOA RNAME hostmaster.kennisnet.org means hostmaster@kennisnet.org.
  • ✓ Date-based serial #26
    The serial 2026101904 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
29 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
49177ECDSAP256SHA256 (13)SHA256 2B24A998E25391F4…yes

DNSKEY in the zone

Key tagRoleAlgorithm
49177KSK (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 49177 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

pass

27 records at the apex

Found

Read from
145.97.34.185:53
TypeValueTTL
SOAns01.kennisnet.nl. hostmaster.kennisnet.org. 2026101904 3600 900 1209600 36003600
NSns02.kennisnet.nl.86400
NSns04.kennisnet.nl.86400
NSns03.kennisnet.nl.86400
NSns01.kennisnet.nl.86400
A145.97.37.813600
AAAA2001:610:2d8:405::37:813600
MX5 kennisnet-nl.mail.protection.outlook.com.3600
TXT"miro-verification=890c9f8713c7a5d0f104a69a1ddcd31a2ae3eb45"3600
TXT"google-site-verification=Ohq8pz9a1T_cv_hj3iVkC_w-WzFWxVz8bzLenjyimQo"3600
TXT"8575c1e5-b64d-45f3-9048-3d6cb194bb10-24052019"3600
TXT"KJ0vk+jU81ziuf4WDsrHAKY3eN6nvN5endnlKIHrCzvayt12//7Wfgm+u6ejxLatZSF1eLxd6Tj3O6qHPc1rWg=="3600
TXT"v=spf1 include:_spf.kennisnet.nl include:_spf.google.com include:spf.protection.outlook.com ip4:145.97.36.220/32 -all"3600
TXT"SjGVa6eFOpxt2LI5XCKnTbYi5AUxPwZWTg/S3Vsf8/k="3600
TXT"QuoVadis=dbe67b38-d894-4a52-bc80-2c745eb415cd"3600
TXT"glh7fmgbztx4ts01n7hhk2lfxx2n4h1r"3600
TXT"adobe-idp-site-verification=f8936095144b07ef08a20d47ee72e00dd52c37108a3e9d67bca196f7a6ba08d4"3600
TXT"google-site-verification=ewnuhyvKbr528bKnzRyy_Yem12agR-c5us1Wrg2BDFY"3600
TXT"SlarXQVEdXHkFwA6kk3FxhcjHGAnAFEOdDQ8iDIhqnk="3600
TXT"QuoVadis=830d44ff-440d-4d74-9529-44a0ec3ff20b"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 issuewild "digicert.com"3600
CAA0 issue "digicert.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "globalsign.com"3600
CAA0 iodef "mailto:fab@kennisnet.nl"3600
CAA0 issue "quovadisglobal.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 1h, NS 1d. The NS TTL at the parent is 1h and in the zone 1d; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org, digicert.com, globalsign.com, quovadisglobal.com.