zuidas.nl

Checked 22 October 2026, 17:31 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 5 info

Registration

info

.nl country-code

Found

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

Delegation

info

a1-140.akam.net, a11-64.akam.net, a12-67.akam.net, a26-65.akam.net, a5-65.akam.net, a6-64.akam.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
a1-140.akam.net, a11-64.akam.net, a12-67.akam.net, a26-65.akam.net, a5-65.akam.net, a6-64.akam.net
NS in the zone
a1-140.akam.net, a11-64.akam.net, a12-67.akam.net, a26-65.akam.net, a5-65.akam.net, a6-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-140.akam.net193.108.91.140 2600:1401:2::8cAS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a11-64.akam.net84.53.139.64 2600:1480:1::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a12-67.akam.net184.26.160.67 2600:1480:f000::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a26-65.akam.net23.74.25.65 2600:1480:b800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-65.akam.net95.100.168.65 2600:1480:b000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a6-64.akam.net23.211.133.64 2600:1401:1::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-140.akam.net, a11-64.akam.net, a12-67.akam.net, a26-65.akam.net, a5-65.akam.net, a6-64.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 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 .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
a1-140.akam.net 193.108.91.140NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a1-140.akam.net 2600:1401:2::8cNOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
a11-64.akam.net 84.53.139.64NOERROR, 5 ms, authoritativenoyes / yesrefused41824.10
a11-64.akam.net 2600:1480:1::40NOERROR, 3 ms, authoritativenoyes / yesrefused41824.11
a12-67.akam.net 184.26.160.67NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a12-67.akam.net 2600:1480:f000::43NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a26-65.akam.net 23.74.25.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.27
a26-65.akam.net 2600:1480:b800::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a5-65.akam.net 95.100.168.65NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
a5-65.akam.net 2600:1480:b000::41NOERROR, 5 ms, authoritativenoyes / yesrefused41824.4
a6-64.akam.net 23.211.133.64NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a6-64.akam.net 2600:1401:1::40NOERROR, 5 ms, authoritativenoyes / yesrefused48878.26

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: a1-140.akam.net: "41824.9"; a1-140.akam.net: "41824.5"; a11-64.akam.net: "41824.10"; a11-64.akam.net: "41824.11"; a12-67.akam.net: "48878.32"; a12-67.akam.net: "48878.29"; a26-65.akam.net: "48878.27"; a26-65.akam.net: "48878.30"; a5-65.akam.net: "41824.5"; a5-65.akam.net: "41824.4"; a6-64.akam.net: "48878.33"; a6-64.akam.net: "48878.26". 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 2021020234 · primary a1-140.akam.net

Found

Primary (MNAME)
a1-140.akam.net
Contact (RNAME)
servicedesk.motiv.nl
Serial
2021020234
Refresh / retry
3600 s / 600 s
Expire
6048000 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-140.akam.net (193.108.91.140)2021020234
a1-140.akam.net (2600:1401:2::8c)2021020234
a11-64.akam.net (84.53.139.64)2021020234
a11-64.akam.net (2600:1480:1::40)2021020234
a12-67.akam.net (184.26.160.67)2021020234
a12-67.akam.net (2600:1480:f000::43)2021020234
a26-65.akam.net (23.74.25.65)2021020234
a26-65.akam.net (2600:1480:b800::41)2021020234
a5-65.akam.net (95.100.168.65)2021020234
a5-65.akam.net (2600:1480:b000::41)2021020234
a6-64.akam.net (23.211.133.64)2021020234
a6-64.akam.net (2600:1401:1::40)2021020234

Checks

  • ✓ Serial 2021020234 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 70d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-140.akam.net is one of the listed nameservers.
  • ✓ Contact servicedesk@motiv.nl #25
    The SOA RNAME servicedesk.motiv.nl means servicedesk@motiv.nl.
  • ✓ Date-based serial #26
    The serial 2021020234 follows the YYYYMMDDnn convention (2021-02-02).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
25 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
40726ZSK (256)ECDSAP256SHA256 (13)
24261KSK (257)ECDSAP256SHA256 (13)
56132KSK (257)ECDSAP256SHA256 (13)
8354ZSK (256)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 73h0m0s and created on demand; the current one was made at 2026-10-22 12:08 UTC and expires at 2026-10-25 13:08 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

11 records at the apex

Found

Read from
193.108.91.140:53
TypeValueTTL
SOAa1-140.akam.net. servicedesk.motiv.nl. 2021020234 3600 600 6048000 30086400
NSa12-67.akam.net.28800
NSa1-140.akam.net.28800
NSa5-65.akam.net.28800
NSa6-64.akam.net.28800
NSa11-64.akam.net.28800
NSa26-65.akam.net.28800
A54.228.204.19328800
AAAA2a05:d018:38a:5b00:58e5:bb20:91d5:85c28800
MX10 zuidas-nl.mail.protection.outlook.com.300
TXT"v=spf1 ip4:168.245.22.166 ip4:46.17.24.3 ip4:46.17.25.3 ip6:2a07:3500:1020:1117::140/123 include:spf.mandrillapp.com include:spf.mailinglijst.nl include:spf.protection.outlook.com include:secumail.email -all"1800

Checks

  • ✓ TTLs within range #32
    TTLs: A 8h, AAAA 8h, MX 5m, NS 8h. The NS TTL at the parent is 1h and in the zone 8h; 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