rtl.nl

Checked 21 October 2026, 21:25 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 4 info

Registration

info

.nl country-code

Found

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

Delegation

info

a1-79.akam.net, a11-66.akam.net, a16-67.akam.net, a2-65.akam.net, a4-65.akam.net, a7-65.akam.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
a1-79.akam.net, a11-66.akam.net, a16-67.akam.net, a2-65.akam.net, a4-65.akam.net, a7-65.akam.net
NS in the zone
a1-79.akam.net, a11-66.akam.net, a16-67.akam.net, a2-65.akam.net, a4-65.akam.net, a7-65.akam.net
NameserverAddressesNetwork (AS)Glue
a1-79.akam.net193.108.91.79 2600:1401:2::4fAS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a11-66.akam.net84.53.139.66 2600:1480:1::42AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a16-67.akam.net23.211.132.67 2600:1406:1b::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a2-65.akam.net95.100.174.65 2600:1480:7000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a4-65.akam.net72.246.46.65 2600:1480:9000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-65.akam.net23.61.199.65 2600:1406:32::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-79.akam.net, a11-66.akam.net, a16-67.akam.net, a2-65.akam.net, a4-65.akam.net, a7-65.akam.net.
  • ✓ 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 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 2 addresses; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 10 addresses.
  • i
    All nameserver names under .net
    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
a1-79.akam.net 193.108.91.79NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
a1-79.akam.net 2600:1401:2::4fNOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a11-66.akam.net 84.53.139.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.9
a11-66.akam.net 2600:1480:1::42NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a16-67.akam.net 23.211.132.67NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
a16-67.akam.net 2600:1406:1b::43NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a2-65.akam.net 95.100.174.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a2-65.akam.net 2600:1480:7000::41NOERROR, 3 ms, authoritativenoyes / yesrefused48878.33
a4-65.akam.net 72.246.46.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a4-65.akam.net 2600:1480:9000::41NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a7-65.akam.net 23.61.199.65NOERROR, 3 ms, authoritativenoyes / yesrefused41824.5
a7-65.akam.net 2600:1406:32::41NOERROR, 3 ms, authoritativenoyes / yesrefused41824.5

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: a1-79.akam.net: "41824.6"; a11-66.akam.net: "41824.9"; a11-66.akam.net: "41824.10"; a16-67.akam.net: "48878.31"; a16-67.akam.net: "48878.32"; a2-65.akam.net: "48878.29"; a2-65.akam.net: "48878.33"; a4-65.akam.net: "48878.32"; a4-65.akam.net: "48878.29"; a7-65.akam.net: "41824.5". 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 2025042791 · primary a1-79.akam.net

Found

Primary (MNAME)
a1-79.akam.net
Contact (RNAME)
hostmaster.rtl.nl
Serial
2025042791
Refresh / retry
3600 s / 600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-79.akam.net (193.108.91.79)2025042791
a1-79.akam.net (2600:1401:2::4f)2025042791
a11-66.akam.net (84.53.139.66)2025042791
a11-66.akam.net (2600:1480:1::42)2025042791
a16-67.akam.net (23.211.132.67)2025042791
a16-67.akam.net (2600:1406:1b::43)2025042791
a2-65.akam.net (95.100.174.65)2025042791
a2-65.akam.net (2600:1480:7000::41)2025042791
a4-65.akam.net (72.246.46.65)2025042791
a4-65.akam.net (2600:1480:9000::41)2025042791
a7-65.akam.net (23.61.199.65)2025042791
a7-65.akam.net (2600:1406:32::41)2025042791

Checks

  • ✓ Serial 2025042791 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-79.akam.net is one of the listed nameservers.
  • ✓ Contact hostmaster@rtl.nl #25
    The SOA RNAME hostmaster.rtl.nl means hostmaster@rtl.nl.
  • ✓ Date-based serial #26
    The serial 2025042791 follows the YYYYMMDDnn convention (2025-04-27).

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

22 records at the apex

Found

Read from
193.108.91.79:53
TypeValueTTL
SOAa1-79.akam.net. hostmaster.rtl.nl. 2025042791 3600 600 604800 30086400
NSa4-65.akam.net.86400
NSa11-66.akam.net.86400
NSa7-65.akam.net.86400
NSa16-67.akam.net.86400
NSa1-79.akam.net.86400
NSa2-65.akam.net.86400
A20.4.98.73600
MX10 rtl-nl.mail.protection.outlook.com.3600
TXT"v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrLHiExVd55zd/IQ/J/mRwSRMAocV/hMB3jXwaHH36d9NaVynQFYV8NaWi69c1veUtRzGt7yAioXqLj7Z4TeEUoOLgrKsn8YnckGs9i3B3tVFB+Ch/4mPhXWiNfNdynHWBcPcbJ8kjEQ2U8y78dHZj1YeRXXVvWob2OaKynO8/lQIDAQAB;"300
TXT"MS=ms36332387"300
TXT"pexip-ms-tenant-domain-verification=86d647f9-8c24-4662-8b88-5b1b6e1b7a47"300
TXT"v=spf1 include:eu.zeptomail.net include:_spf.rtl.nl include:mail.zendesk.com include:sendgrid.net include:spf.protection.outlook.com include:spf.mandrillapp.com include:_spf.google.com include:mailswitch.nl include:servers.mcsv.net mx:twobridges.io -all"300
TXT"atlassian-domain-verification=PZW/OJtTjgaCGZUiBsaCvgrzCXiBEUyrBQc1C3GQTCeGJvDNEwxNwtBD2tEEltxD"300
TXT"zscaler-verification-148208080-1092025-hsjdgi7U"300
TXT"google-site-verification=Fjim64bVFoxvULtW8sIxMpX-LCjdvUv1WnFUtf_cY-E"300
TXT"atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O571fgiIg//j5Hn"300
TXT"atlassian-domain-verification=gqfC576h6pKDntEMQCdrUMXTtOD2vfhKvXTSXAIxiT3BSdIBLzbPWwOkt0jwiITX"300
TXT"google-site-verification=VIMvAMEWSKcmegEuHH6rGz0QwxCbGxZXDqT1hQfK99s"300
TXT"google-site-verification=3Uv0BjwMcu0TH74b_dat8ivq_cxmDA140MNbAOfW57o"300
TXT"google-site-verification=fkOhMGnF3x8VBZhqON8eWYPM_qS2EiXF68po30ec5k4"300
TXT"tmes=b315393dda67feca28f0a51a0cb2b1b9"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, 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