postnl.nl

Checked 21 October 2026, 21:24 UTC · via 8.8.8.8
!Passed with warnings
25 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/postnl.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/postnl.nl returned HTTP 429
    #3

Delegation

info

a1-6.akam.net, a13-67.akam.net, a14-64.akam.net, a18-65.akam.net, a2-66.akam.net, a3-67.akam.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
a1-6.akam.net, a13-67.akam.net, a14-64.akam.net, a18-65.akam.net, a2-66.akam.net, a3-67.akam.net
NS in the zone
a1-6.akam.net, a13-67.akam.net, a14-64.akam.net, a18-65.akam.net, a2-66.akam.net, a3-67.akam.net
NameserverAddressesNetwork (AS)Glue
a1-6.akam.net193.108.91.6 2600:1401:2::6AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-67.akam.net2.22.230.67 2600:1480:800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a14-64.akam.net184.26.161.64 2600:1480:1800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-65.akam.net95.101.36.65 2600:1480:4800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a2-66.akam.net95.100.174.66 2600:1480:7000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-67.akam.net96.7.49.67 2600:1408:1c::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-6.akam.net, a13-67.akam.net, a14-64.akam.net, a18-65.akam.net, a2-66.akam.net, a3-67.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
a1-6.akam.net 193.108.91.6NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a1-6.akam.net 2600:1401:2::6NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a13-67.akam.net 2.22.230.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a13-67.akam.net 2600:1480:800::43NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
a14-64.akam.net 184.26.161.64NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a14-64.akam.net 2600:1480:1800::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a18-65.akam.net 95.101.36.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.33
a18-65.akam.net 2600:1480:4800::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a2-66.akam.net 95.100.174.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a2-66.akam.net 2600:1480:7000::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a3-67.akam.net 96.7.49.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a3-67.akam.net 2600:1408:1c::43NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6

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: a1-6.akam.net: "41824.8"; a1-6.akam.net: "41824.7"; a13-67.akam.net: "41824.10"; a13-67.akam.net: "41824.8"; a14-64.akam.net: "48878.33"; a14-64.akam.net: "48878.32"; a18-65.akam.net: "48878.33"; a18-65.akam.net: "48878.32"; a2-66.akam.net: "48878.26"; a2-66.akam.net: "48878.29"; a3-67.akam.net: "41824.10"; a3-67.akam.net: "41824.6". 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 2018072413 · primary a1-6.akam.net

Found

Primary (MNAME)
a1-6.akam.net
Contact (RNAME)
domain-registry.postnl.nl
Serial
2018072413
Refresh / retry
28800 s / 3600 s
Expire
2592000 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
a1-6.akam.net (193.108.91.6)2018072413
a1-6.akam.net (2600:1401:2::6)2018072413
a13-67.akam.net (2.22.230.67)2018072413
a13-67.akam.net (2600:1480:800::43)2018072413
a14-64.akam.net (184.26.161.64)2018072413
a14-64.akam.net (2600:1480:1800::40)2018072413
a18-65.akam.net (95.101.36.65)2018072413
a18-65.akam.net (2600:1480:4800::41)2018072413
a2-66.akam.net (95.100.174.66)2018072413
a2-66.akam.net (2600:1480:7000::42)2018072413
a3-67.akam.net (96.7.49.67)2018072413
a3-67.akam.net (2600:1408:1c::43)2018072413

Checks

  • ✓ Serial 2018072413 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 1h, expire 30d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-6.akam.net is one of the listed nameservers.
  • ✓ Contact domain-registry@postnl.nl #25
    The SOA RNAME domain-registry.postnl.nl means domain-registry@postnl.nl.
  • ✓ Date-based serial #26
    The serial 2018072413 follows the YYYYMMDDnn convention (2018-07-24).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
24 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
42727RSASHA512 (10)SHA256 5989DE835E68068E…NO
37447RSASHA512 (10)SHA256 43E7CAFA9BE56954…yes

DNSKEY in the zone

Key tagRoleAlgorithm
9735ZSK (256)RSASHA512 (10)
54891ZSK (256)RSASHA512 (10)
37447KSK (257)RSASHA512 (10)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • i
    Unused DS records
    These DS records match no key in the zone: key tag 42727 (SHA256). That is normal during a key rollover; otherwise remove them.
    #28
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA512 (10).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 73h0m0s and created on demand; the current one was made at 2026-10-21 19:28 UTC and expires at 2026-10-24 20:28 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

warn

30 records at the apex

Found

Read from
193.108.91.6:53
TypeValueTTL
SOAa1-6.akam.net. domain-registry.postnl.nl. 2018072413 28800 3600 2592000 90086400
NSa14-64.akam.net.7200
NSa3-67.akam.net.7200
NSa1-6.akam.net.7200
NSa13-67.akam.net.7200
NSa2-66.akam.net.7200
NSa18-65.akam.net.7200
A2.16.204.2620
A2.16.204.1020
AAAA2a02:26f0:b700:5::210:cc0a20
AAAA2a02:26f0:b700:5::210:cc1a20
MX10 postnl-nl.j-v1.mx.microsoft.3600
TXT"v=spf1 ip4:87.233.130.51 ip4:83.149.98.72 include:spf.protection.outlook.com include:spf1.postnl.nl include:spf2.postnl.nl include:spf.topdesk.net -all"300
TXT"onetrust-domain-verification=8f184bac1ddd446ea5432e43860473dc"300
TXT"google-site-verification=7bKJMEdNGuE06EzL0diQp_EvY_v_zwS_F6U8Gho1NTk"300
TXT"onetrust-domain-verification=74b428aca4be4f9797ef59e1bf5768c6"300
TXT"pardot_301951_*=48970e6fc45d8ec30f71387137d35a7773aead17090615c1553bdd0ceb10b1c3"300
TXT"jamf-site-verification=XItWgplAcL6X-MZv4Khexg"300
TXT"docusign=274ac4b5-ec88-47ce-b3e5-fffbaf3bfc77"300
TXT"MS=ms37833763"300
TXT"google-site-verification=GWGxBXl92bzo7nltDfPaLKbugMtgYNzQ8Rbkuhm6iYk"300
TXT"google-site-verification=w70WsHjdPfJF8qD3dR1raPg04dDKLzLlzYTPt2FT3rA"300
TXT"openai-domain-verification=dv-PonaGpwaZXCpODLiVBtCK3ta"300
TXT"j6qmwwxpyzk34dnbmj68qdd5zzl7jh6q"300
TXT"anthropic-domain-verification-t0crjy=xTxtqmamcZdSnzwdL5zwlQ7OU"300
TXT"openai-domain-verification=dv-917zSGBp8Dpxx0y6lC6JkKKI"300
TXT"atlassian-domain-verification=tdrQtMHi0im7Nb+CyN2BZvkJNYBTFPMyTLMm+4O+UGlKYltKFSkiwt2DqKyz/MSN"300
TXT"miro-verification=961700b9c0914fd95da5f6c540edfca7beb773eb"300
TXT"adobe-idp-site-verification=6a45d6aa22fc438b97a4e3d282ffe785492c90831b8365a246283658479794b3"300
TXT"MNgM0tfwmQfvXEDPAev/o1Qy5yqS9ePGscJB+kNeIe392K6hzg2+IKF8tfmb+8cnhC/gUb+bZbk38fVYvj9K4A=="300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 2h; resolvers may use either.
    #32
  • ✓ 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