nlr.nl

Checked 22 October 2026, 14:50 UTC · via 8.8.8.8
✗Problems found
22 passed 1 warning 1 failed 5 info

Registration

info

.nl country-code

Found

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

Delegation

info

nlrdns01.nlr.nl, ns2.kpn.net, spider.nlr.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
nlrdns01.nlr.nl, ns2.kpn.net, spider.nlr.nl
NS in the zone
nlrdns01.nlr.nl, ns2.kpn.net, spider.nlr.nl
NameserverAddressesNetwork (AS)Glue
nlrdns01.nlr.nl137.17.231.200AS1136 KPN - KPN B.V., NL137.17.231.200
ns2.kpn.net194.151.228.58 2a02:a47f:ac:1::253AS1136 KPN - KPN B.V., NL AS1136 KPN - KPN B.V., NL-
spider.nlr.nl137.17.80.200AS1136 KPN - KPN B.V., NL137.17.80.200

Checks

  • ✓ 3 nameservers #6
    Delegated to nlrdns01.nlr.nl, ns2.kpn.net, spider.nlr.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: nlrdns01.nlr.nl, spider.nlr.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 1 IPv6 /48.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1136 (KPN - KPN 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 .net, .nl.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: nlrdns01.nlr.nl, spider.nlr.nl.
    #13

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
nlrdns01.nlr.nl 137.17.231.200NOERROR, 13 ms, authoritativenono / yesrefusedunknown
ns2.kpn.net 194.151.228.58NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns2.kpn.net 2a02:a47f:ac:1::253NOERROR, 12 ms, authoritativenoyes / yesrefused-
spider.nlr.nl 137.17.80.200NOERROR, 21 ms, authoritativenono / yesrefuseda.b.c

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: nlrdns01.nlr.nl: "unknown"; spider.nlr.nl: "a.b.c".
    #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: nlrdns01.nlr.nl (137.17.231.200): dial tcp 137.17.231.200:53: i/o timeout; spider.nlr.nl (137.17.80.200): dial tcp 137.17.80.200:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026102208 · primary nlrdns01.nlr.nl

Found

Primary (MNAME)
nlrdns01.nlr.nl
Contact (RNAME)
hostmaster.nlr.nl
Serial
2026102208
Refresh / retry
28800 s / 14400 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
nlrdns01.nlr.nl (137.17.231.200)2026102208
ns2.kpn.net (194.151.228.58)2026102208
ns2.kpn.net (2a02:a47f:ac:1::253)2026102208
spider.nlr.nl (137.17.80.200)2026102208

Checks

  • ✓ Serial 2026102208 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 4h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver nlrdns01.nlr.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@nlr.nl #25
    The SOA RNAME hostmaster.nlr.nl means hostmaster@nlr.nl.
  • ✓ Date-based serial #26
    The serial 2026102208 follows the YYYYMMDDnn convention (2026-10-22).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

pass

17 records at the apex

Found

Read from
137.17.231.200:53
TypeValueTTL
SOAnlrdns01.nlr.nl. hostmaster.nlr.nl. 2026102208 28800 14400 604800 360086400
NSns2.kpn.net.86400
NSnlrdns01.nlr.nl.86400
NSspider.nlr.nl.86400
A137.17.231.24886400
MX10 mx2.nlr.nl.86400
MX10 mx1.nlr.nl.86400
TXT"aee99990-c35d-4062-b1bd-89facc6cb950-06072018"86400
TXT"v=spf1 a mx ip4:137.17.162.8 ip4:137.17.162.9 -all"86400
TXT"QuoVadis=053c5751-3eca-4f50-be24-39579447a7fe"86400
TXT"MS=65078C2EA8CC065C1BFE05BA55A9F4E5FB4FA9EE"86400
TXT"google-site-verification=KYI7nMFAlmPV5-wr30e-HURk-MrBEV8IdTb8ACWlRaQ"86400
CAA0 iodef "mailto:hugo.van.dort@nlr.nl"86400
CAA0 issue "sectigo.com"86400
CAA0 issue "quovadisglobal.com"86400
CAA0 issue "digicert.com"86400
CAA0 issue "letsencrypt.org"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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: sectigo.com, quovadisglobal.com, digicert.com, letsencrypt.org.