nbdbiblion.nl

Checked 22 October 2026, 14:40 UTC · via 8.8.8.8
!Passed with warnings
26 passed 1 warning 0 failed 6 info

Registration

info

.nl country-code

Found

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

Delegation

warn

ns1.surfnet.nl, ns2.surfnet.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns1.surfnet.nl, ns2.surfnet.nl
NS in the zone
ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl
NameserverAddressesNetwork (AS)Glue
ns1.surfnet.nl192.87.106.101 2001:610:1:800a:192:87:106:101AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL192.87.106.101 2001:610:1:800a:192:87:106:101
ns1.zurich.surf.net (zone only)195.176.255.9 2001:620:0:9::1103AS559 Switch - SWITCH, CH AS559 Switch - SWITCH, CH-
ns2.surfnet.nl192.87.36.2 2001:610:3:200a:192:87:36:2AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL192.87.36.2 2001:610:3:200a:192:87:36:2
ns3.surfnet.nl (zone only)195.169.124.71 2001:610:0:800c:195:169:124:71AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.surfnet.nl, ns2.surfnet.nl.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ns1.zurich.surf.net, ns3.surfnet.nl. ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl report NS ns1.surfnet.nl ns1.zurich.surf.net ns2.surfnet.nl ns3.surfnet.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 4 IPv4 /24s and 4 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 6 addresses; AS559 (Switch - SWITCH, CH): 2 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

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.surfnet.nl 192.87.106.101NOERROR, 10 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.surfnet.nl 2001:610:1:800a:192:87:106:101NOERROR, 10 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.zurich.surf.net 195.176.255.9NOERROR, 10 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surf.nl
ns1.zurich.surf.net 2001:620:0:9::1103NOERROR, 10 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surf.nl
ns2.surfnet.nl 192.87.36.2NOERROR, 13 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surfnet.nl
ns2.surfnet.nl 2001:610:3:200a:192:87:36:2NOERROR, 13 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surfnet.nl
ns3.surfnet.nl 195.169.124.71NOERROR, 10 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surfnet.nl
ns3.surfnet.nl 2001:610:0:800c:195:169:124:71NOERROR, 10 ms, authoritativenoyes / yesrefusedThis is a SURFnet nameserver - dns-beheer@surfnet.nl

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns1.zurich.surf.net: "This is a SURFnet nameserver - dns-beheer@surf.nl"; ns2.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns3.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl".
    #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 2026102201 · primary ns1.surfnet.nl

Found

Primary (MNAME)
ns1.surfnet.nl
Contact (RNAME)
dns-beheer.surf.nl
Serial
2026102201
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.surfnet.nl (192.87.106.101)2026102201
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)2026102201
ns1.zurich.surf.net (195.176.255.9)2026102201
ns1.zurich.surf.net (2001:620:0:9::1103)2026102201
ns2.surfnet.nl (192.87.36.2)2026102201
ns2.surfnet.nl (2001:610:3:200a:192:87:36:2)2026102201
ns3.surfnet.nl (195.169.124.71)2026102201
ns3.surfnet.nl (2001:610:0:800c:195:169:124:71)2026102201

Checks

  • ✓ Serial 2026102201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.surfnet.nl is one of the listed nameservers.
  • ✓ Contact dns-beheer@surf.nl #25
    The SOA RNAME dns-beheer.surf.nl means dns-beheer@surf.nl.
  • ✓ Date-based serial #26
    The serial 2026102201 follows the YYYYMMDDnn convention (2026-10-22).

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
5 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
56068ECDSAP256SHA256 (13)SHA256 08F44B38D5A27F6E…yes

DNSKEY in the zone

Key tagRoleAlgorithm
56068KSK (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 56068 (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.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

15 records at the apex

Found

Read from
192.87.106.101:53
TypeValueTTL
SOAns1.surfnet.nl. dns-beheer.surf.nl. 2026102201 10800 3600 604800 36003600
NSns1.surfnet.nl.3600
NSns1.zurich.surf.net.3600
NSns2.surfnet.nl.3600
NSns3.surfnet.nl.3600
A87.233.198.73600
AAAA2001:9a8:a6:0:87:233:198:73600
MX10 nbdbiblion-nl.mail.protection.outlook.com.3600
MX20 relay.surfnet.nl.3600
TXT"docusign=2d3fd6e6-6c4c-4d50-b37b-e6bd67ecc6d3"3600
TXT"v=spf1 ip4:51.138.91.228 include:spf.protection.outlook.com include:spf.emailsignatures365.com include:spf.afas.online include:mail.eu1.inforcloudsuite.com include:mailoutgoing.swis.nl include:customers.clickdimensions.com a:mail-in-2.signet.nl incl" "ude:_spf.exsilia.net ip4:198.37.154.52 ip4:193.37.205.65 ip4:193.37.205.64 ip4:193.37.205.89 -all"3600
TXT"ms-domain-verification=a94a2638-5d13-41c1-b3c2-a05255c8223c"3600
TXT"d365mktkey=iwxKQmFovxersYLTzaG2PPfnqrnGO1WYbpapLdxKLhEx"3600
TXT"atlassian-domain-verification=uRVenfGGsWbSFEAxyKPWIAU3jlLLl4BgRmIoKFfjsz1P63ExASTjc2EYWLOMt9/2"3600
TXT"google-site-verification=vt5JMtNJY6BvyG7jGzPyTtIRtdlQoMUZBchFGRIIzoM"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