tekenradar.nl

ns1.ssc-campus.nl, ns1.w-e-r-k.nl, ns2.ssc-campus.nl, ns2.w-e-r-k.nl

Found

Parent zone

nl

Delegation from

ns1.dns.nl (194.0.28.53)

NS at the parent

ns1.ssc-campus.nl, ns1.w-e-r-k.nl, ns2.ssc-campus.nl, ns2.w-e-r-k.nl

NS in the zone

ns1.ssc-campus.nl, ns1.surfnet.nl, ns2.ssc-campus.nl, ns2.surfnet.nl

Checks

• ✓ 4 nameservers #6

  Delegated to ns1.ssc-campus.nl, ns1.w-e-r-k.nl, ns2.ssc-campus.nl, ns2.w-e-r-k.nl.
• !

  NS sets differ

  The nameservers at the parent and in the zone should be the same. Only at the parent: ns1.w-e-r-k.nl, ns2.w-e-r-k.nl; only in the zone: ns1.surfnet.nl, ns2.surfnet.nl. ns1.ssc-campus.nl, ns1.surfnet.nl, ns1.w-e-r-k.nl, ns2.ssc-campus.nl, ns2.surfnet.nl, ns2.w-e-r-k.nl report NS ns1.ssc-campus.nl ns1.surfnet.nl ns2.ssc-campus.nl ns2.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 5 IPv4 /24s and 5 IPv6 /48s.
• ✓ 2 autonomous systems #11

  The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 8 addresses; AS20559 (FUNDAMENTS-AS - Fundaments 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.

12 of 12 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 12 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: ns1.w-e-r-k.nl: "PowerDNS Authoritative Server 5.1.5 (built Oct 7 2026 06:27:56 by root@localhost)"; ns2.w-e-r-k.nl: "PowerDNS Authoritative Server 5.1.5 (built Oct 7 2026 06:27:56 by root@localhost)". 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.

Signed, DS published at parent

Found

Validated by resolver

yes

Denial of existence

NSEC3

NSEC3

10 iterations, 7-byte salt

Signatures valid until

4 November 2026

DS at the parent

DNSKEY in the zone

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 385 (SHA256).
• ✓ Modern algorithms #29

  Key algorithms: RSASHA256 (8).
• ✓ Signatures valid until 2026-11-04 #30

  The earliest DNSKEY/SOA signature expires at 2026-11-04 21:41 UTC.
• !

  NSEC3 with extra iterations or salt

  NSEC3 uses 10 iterations and a 7-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

  #31