dse.nl

Checked 21 October 2026, 21:15 UTC · via 8.8.8.8
✗Problems found
23 passed 2 warnings 1 failed 7 info

Registration

info

.nl country-code

Found

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

Delegation

info

ns1.flexwebhosting.nl, ns2.flexwebhosting.nl, ns3.flexwebhosting.com

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns1.flexwebhosting.nl, ns2.flexwebhosting.nl, ns3.flexwebhosting.com
NS in the zone
ns1.flexwebhosting.nl, ns2.flexwebhosting.nl, ns3.flexwebhosting.com
NameserverAddressesNetwork (AS)Glue
ns1.flexwebhosting.nl62.84.243.10 2a02:2968:2::10AS48635 CLDIN-NL - Your Hosting B.V., NL AS48635 CLDIN-NL - Your Hosting B.V., NL62.84.243.10 2a02:2968:2::10
ns2.flexwebhosting.nl185.27.140.33AS48635 CLDIN-NL - Your Hosting B.V., NL185.27.140.33
ns3.flexwebhosting.com185.231.200.133AS48635 CLDIN-NL - Your Hosting B.V., NL-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.flexwebhosting.nl, ns2.flexwebhosting.nl, ns3.flexwebhosting.com.
  • ✓ 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 3 IPv4 /24s and 1 IPv6 /48.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS48635 (CLDIN-NL - Your Hosting B.V., NL): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .nl.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns2.flexwebhosting.nl, ns3.flexwebhosting.com.
    #13

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.flexwebhosting.nl 62.84.243.10NOERROR, 10 ms, authoritativenoyes / yesrefusedBind
ns1.flexwebhosting.nl 2a02:2968:2::10NOERROR, 10 ms, authoritativenoyes / yesrefusedBind
ns2.flexwebhosting.nl 185.27.140.33NOERROR, 11 ms, authoritativenoyes / yesrefusedBind
ns3.flexwebhosting.com 185.231.200.133NOERROR, 10 ms, authoritativenono / yesrefusedBind

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.flexwebhosting.nl: "Bind"; ns2.flexwebhosting.nl: "Bind"; ns3.flexwebhosting.com: "Bind".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns3.flexwebhosting.com (185.231.200.133): dial tcp 185.231.200.133:53: connect: no route to host.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2100002457 · primary ns1.flexwebhosting.nl

Found

Primary (MNAME)
ns1.flexwebhosting.nl
Contact (RNAME)
hostmaster.dse.nl
Serial
2100002457
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.flexwebhosting.nl (62.84.243.10)2100002457
ns1.flexwebhosting.nl (2a02:2968:2::10)2100002457
ns2.flexwebhosting.nl (185.27.140.33)2100002457
ns3.flexwebhosting.com (185.231.200.133)2100002457

Checks

  • ✓ Serial 2100002457 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.flexwebhosting.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@dse.nl #25
    The SOA RNAME hostmaster.dse.nl means hostmaster@dse.nl.
  • ✓ Timestamp serial #26
    The serial 2100002457 is a Unix timestamp (2036-07-18 14:00 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
1 iterations, 1-byte salt
Signatures valid until
29 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
20537ECDSAP256SHA256 (13)SHA256 3EC387084C7FB603…yes

DNSKEY in the zone

Key tagRoleAlgorithm
20537KSK (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 20537 (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 with extra iterations or salt
    NSEC3 uses 1 iteration and a 1-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

Records

warn

8 records at the apex

Found

Read from
62.84.243.10:53
TypeValueTTL
SOAns1.flexwebhosting.nl. hostmaster.dse.nl. 2100002457 14400 3600 604800 8640060
NSns1.flexwebhosting.nl.60
NSns2.flexwebhosting.nl.60
NSns3.flexwebhosting.com.60
A185.89.5.25160
MX100 srv2.flexfilter.nl.60
MX100 srv1.flexfilter.nl.60
TXT"v=spf1 a mx ip4:212.61.53.195 ip4:195.121.94.185 a:spf.flexfilter.nl include:spf.ews.kpnxchange.com -all"900

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m), NS (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 1m; resolvers may use either.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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