onsamsterdam.nl

Checked 22 October 2026, 15:01 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 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/onsamsterdam.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/onsamsterdam.nl returned HTTP 429
    #3

Delegation

info

guy.ns.cloudflare.com, linda.ns.cloudflare.com

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
guy.ns.cloudflare.com, linda.ns.cloudflare.com
NS in the zone
guy.ns.cloudflare.com, linda.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
guy.ns.cloudflare.com173.245.59.173 172.64.33.173 108.162.193.173 2803:f800:50::6ca2:c1ad 2606:4700:58::adf5:3bad 2a06:98c1:50::ac40:21adAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-
linda.ns.cloudflare.com173.245.58.250 108.162.192.250 172.64.32.250 2a06:98c1:50::ac40:20fa 2803:f800:50::6ca2:c0fa 2606:4700:50::adf5:3afaAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: guy.ns.cloudflare.com, linda.ns.cloudflare.com.
    #6
  • ✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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 .com
    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

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
guy.ns.cloudflare.com 173.245.59.173NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 172.64.33.173NOERROR, 19 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 108.162.193.173NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 2803:f800:50::6ca2:c1adNOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 2606:4700:58::adf5:3badNOERROR, 19 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 2a06:98c1:50::ac40:21adNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 173.245.58.250NOERROR, 20 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 108.162.192.250NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 172.64.32.250NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 2a06:98c1:50::ac40:20faNOERROR, 22 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 2803:f800:50::6ca2:c0faNOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 2606:4700:50::adf5:3afaNOERROR, 21 ms, authoritativenoyes / yesrefused2026.10.2

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: guy.ns.cloudflare.com: "2026.10.2"; linda.ns.cloudflare.com: "2026.10.2". 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.

SOA

pass

serial 2416407579 · primary guy.ns.cloudflare.com

Found

Primary (MNAME)
guy.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2416407579
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
guy.ns.cloudflare.com (173.245.59.173)2416407579
guy.ns.cloudflare.com (172.64.33.173)2416407579
guy.ns.cloudflare.com (108.162.193.173)2416407579
guy.ns.cloudflare.com (2803:f800:50::6ca2:c1ad)2416407579
guy.ns.cloudflare.com (2606:4700:58::adf5:3bad)2416407579
guy.ns.cloudflare.com (2a06:98c1:50::ac40:21ad)2416407579
linda.ns.cloudflare.com (173.245.58.250)2416407579
linda.ns.cloudflare.com (108.162.192.250)2416407579
linda.ns.cloudflare.com (172.64.32.250)2416407579
linda.ns.cloudflare.com (2a06:98c1:50::ac40:20fa)2416407579
linda.ns.cloudflare.com (2803:f800:50::6ca2:c0fa)2416407579
linda.ns.cloudflare.com (2606:4700:50::adf5:3afa)2416407579

Checks

  • ✓ Serial 2416407579 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver guy.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2416407579 is a Unix timestamp (2046-07-28 16:19 UTC).

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

info

14 records at the apex

Found

Read from
173.245.59.173:53
TypeValueTTL
SOAguy.ns.cloudflare.com. dns.cloudflare.com. 2416407579 10000 2400 604800 18001800
NSguy.ns.cloudflare.com.86400
NSlinda.ns.cloudflare.com.86400
A188.114.96.2300
A188.114.97.2300
AAAA2a06:98c1:3120::2300
AAAA2a06:98c1:3121::2300
MX10 onsamsterdam-nl.mail.protection.outlook.com.3600
TXT"MS=ms41410331"300
TXT"facebook-domain-verification=uz123af7tvi1snvsw3lf547i40zh6f"300
TXT"google-site-verification=NTrlZPKj5DyxbvHM4fNPGONZ_yqSkmT24Y9-Rik_F_I"300
TXT"google-site-verification=acllReTqZO469IcpKVE_m2lg-9Iye7eX_eOH5iqy95o"300
TXT"google-site-verification=l8dqL7jp_z3iEdIn5btT-q1pzI8KrSie8areQX5waX8"300
TXT"v=spf1 include:spf.protection.outlook.com include:spfa.mailendo.com include:spf.mandrillapp.com ~all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 1h, 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