zwerfkei.nl

Checked 22 October 2026, 17:31 UTC · via 8.8.8.8
iAll checks passed
25 passed 0 warnings 0 failed 8 info

Registration

info

.nl country-code

Found

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

Delegation

info

auth01.dns.trueserver.nl, auth02.dns.trueserver.nl, auth03.dns.trueserver.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
auth01.dns.trueserver.nl, auth02.dns.trueserver.nl, auth03.dns.trueserver.nl
NS in the zone
auth01.dns.trueserver.nl, auth02.dns.trueserver.nl, auth03.dns.trueserver.nl
NameserverAddressesNetwork (AS)Glue
auth01.dns.trueserver.nl213.193.210.2 2001:9a8:0:10::2AS15703 TrueServer-AS - TrueFullstaq B.V., NL AS15703 TrueServer-AS - TrueFullstaq B.V., NL213.193.210.2 2001:9a8:0:10::2
auth02.dns.trueserver.nl193.28.152.2 2001:9a8:0:11::2AS15703 TrueServer-AS - TrueFullstaq B.V., NL AS15703 TrueServer-AS - TrueFullstaq B.V., NL193.28.152.2 2001:9a8:0:11::2
auth03.dns.trueserver.nl213.239.136.2 2001:9a8:0:12::2AS15703 TrueServer-AS - TrueFullstaq B.V., NL AS15703 TrueServer-AS - TrueFullstaq B.V., NL213.239.136.2 2001:9a8:0:12::2

Checks

  • ✓ 3 nameservers #6
    Delegated to auth01.dns.trueserver.nl, auth02.dns.trueserver.nl, auth03.dns.trueserver.nl.
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:9a8::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS15703 (TrueServer-AS - TrueFullstaq B.V., NL): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • 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

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
auth01.dns.trueserver.nl 213.193.210.2NOERROR, 13 ms, authoritativenoyes / yesrefusedTrueFullstaq B.V. - Authoritative Nameserver
auth01.dns.trueserver.nl 2001:9a8:0:10::2NOERROR, 12 ms, authoritativenoyes / yesrefusedTrueFullstaq B.V. - Authoritative Nameserver
auth02.dns.trueserver.nl 193.28.152.2NOERROR, 11 ms, authoritativenoyes / yesrefusedTrueFullstaq B.V. - Authoritative Nameserver
auth02.dns.trueserver.nl 2001:9a8:0:11::2NOERROR, 11 ms, authoritativenoyes / yesrefusedTrueFullstaq B.V. - Authoritative Nameserver
auth03.dns.trueserver.nl 213.239.136.2NOERROR, 17 ms, authoritativenoyes / yesrefusedTrueFullstaq B.V. - Authoritative Nameserver
auth03.dns.trueserver.nl 2001:9a8:0:12::2NOERROR, 17 ms, authoritativenoyes / yesrefusedTrueFullstaq B.V. - Authoritative Nameserver

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: auth01.dns.trueserver.nl: "TrueFullstaq B.V. - Authoritative Nameserver"; auth02.dns.trueserver.nl: "TrueFullstaq B.V. - Authoritative Nameserver"; auth03.dns.trueserver.nl: "TrueFullstaq B.V. - Authoritative Nameserver".
    #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 2026102203 · primary auth01.dns.trueserver.nl

Found

Primary (MNAME)
auth01.dns.trueserver.nl
Contact (RNAME)
hostmaster.trueserver.nl
Serial
2026102203
Refresh / retry
86400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
auth01.dns.trueserver.nl (213.193.210.2)2026102203
auth01.dns.trueserver.nl (2001:9a8:0:10::2)2026102203
auth02.dns.trueserver.nl (193.28.152.2)2026102203
auth02.dns.trueserver.nl (2001:9a8:0:11::2)2026102203
auth03.dns.trueserver.nl (213.239.136.2)2026102203
auth03.dns.trueserver.nl (2001:9a8:0:12::2)2026102203

Checks

  • ✓ Serial 2026102203 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver auth01.dns.trueserver.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@trueserver.nl #25
    The SOA RNAME hostmaster.trueserver.nl means hostmaster@trueserver.nl.
  • ✓ Date-based serial #26
    The serial 2026102203 follows the YYYYMMDDnn convention (2026-10-22).

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
57598ECDSAP256SHA256 (13)SHA256 C1FF48402D863129…yes

DNSKEY in the zone

Key tagRoleAlgorithm
57598KSK (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 57598 (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

10 records at the apex

Found

Read from
213.193.210.2:53
TypeValueTTL
SOAauth01.dns.trueserver.nl. hostmaster.trueserver.nl. 2026102203 86400 3600 604800 8640086400
NSauth01.dns.trueserver.nl.86400
NSauth03.dns.trueserver.nl.86400
NSauth02.dns.trueserver.nl.86400
A87.233.246.166300
AAAA2001:9a8:0:be:87:233:246:166300
MX10 zwerfkei-nl.mail.protection.outlook.com.300
TXT"MS=MS73721147"300
TXT"google-site-verification=rjpj5ZNFp8JcKKSTlSI5ulFgl9WYvqfjIro9sCbzZ5w"300
TXT"v=spf1 include:spf.protection.outlook.com ip4:178.248.154.49 ip4:87.233.246.166 ip4:87.233.41.67 ip4:92.70.34.97 ip6:2001:9a8:0:be:87:233:246:166 -all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, 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.
  • 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