dnb.nl

Checked 21 October 2026, 21:15 UTC · via 8.8.8.8
!Passed with warnings
27 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/dnb.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/dnb.nl returned HTTP 429
    #3

Delegation

info

a1-13.akam.net, a18-66.akam.net, a24-67.akam.net, a26-64.akam.net, a3-67.akam.net, a5-64.akam.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
a1-13.akam.net, a18-66.akam.net, a24-67.akam.net, a26-64.akam.net, a3-67.akam.net, a5-64.akam.net
NS in the zone
a1-13.akam.net, a18-66.akam.net, a24-67.akam.net, a26-64.akam.net, a3-67.akam.net, a5-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-13.akam.net193.108.91.13 2600:1401:2::dAS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-66.akam.net95.101.36.66 2600:1480:4800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a24-67.akam.net2.16.130.67 2600:1480:9800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a26-64.akam.net23.74.25.64 2600:1480:b800::40AS21342 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-
a5-64.akam.net95.100.168.64 2600:1480:b000::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-13.akam.net, a18-66.akam.net, a24-67.akam.net, a26-64.akam.net, a3-67.akam.net, a5-64.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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 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
a1-13.akam.net 193.108.91.13NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a1-13.akam.net 2600:1401:2::dNOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a18-66.akam.net 95.101.36.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.27
a18-66.akam.net 2600:1480:4800::42NOERROR, 3 ms, authoritativenoyes / yesrefused48878.33
a24-67.akam.net 2.16.130.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.26
a24-67.akam.net 2600:1480:9800::43NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a26-64.akam.net 23.74.25.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.26
a26-64.akam.net 2600:1480:b800::40NOERROR, 3 ms, authoritativenoyes / yesrefused48878.31
a3-67.akam.net 96.7.49.67NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a3-67.akam.net 2600:1408:1c::43NOERROR, 3 ms, authoritativenoyes / yesrefused41824.11
a5-64.akam.net 95.100.168.64NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
a5-64.akam.net 2600:1480:b000::40NOERROR, 3 ms, authoritativenoyes / yesrefused41824.7

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: a1-13.akam.net: "41824.7"; a1-13.akam.net: "41824.8"; a18-66.akam.net: "48878.27"; a18-66.akam.net: "48878.33"; a24-67.akam.net: "48878.26"; a24-67.akam.net: "48878.29"; a26-64.akam.net: "48878.26"; a26-64.akam.net: "48878.31"; a3-67.akam.net: "41824.7"; a3-67.akam.net: "41824.11"; a5-64.akam.net: "41824.6"; a5-64.akam.net: "41824.7". 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 580 · primary a26-64.akam.net

Found

Primary (MNAME)
a26-64.akam.net
Contact (RNAME)
postmaster.dnb.nl
Serial
580
Refresh / retry
43200 s / 7200 s
Expire
604800 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
a1-13.akam.net (193.108.91.13)580
a1-13.akam.net (2600:1401:2::d)580
a18-66.akam.net (95.101.36.66)580
a18-66.akam.net (2600:1480:4800::42)580
a24-67.akam.net (2.16.130.67)580
a24-67.akam.net (2600:1480:9800::43)580
a26-64.akam.net (23.74.25.64)580
a26-64.akam.net (2600:1480:b800::40)580
a3-67.akam.net (96.7.49.67)580
a3-67.akam.net (2600:1408:1c::43)580
a5-64.akam.net (95.100.168.64)580
a5-64.akam.net (2600:1480:b000::40)580

Checks

  • ✓ Serial 580 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 7d, negative TTL 2h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a26-64.akam.net is one of the listed nameservers.
  • ✓ Contact postmaster@dnb.nl #25
    The SOA RNAME postmaster.dnb.nl means postmaster@dnb.nl.
  • ✓ Counter serial #26
    The serial 580 is a plain counter.

DNSSEC

pass

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
31ECDSAP384SHA384 (14)SHA256 B469A73F155CC7E5…yes

DNSKEY in the zone

Key tagRoleAlgorithm
53803ZSK (256)ECDSAP384SHA384 (14)
40670ZSK (256)ECDSAP384SHA384 (14)
31KSK (257)ECDSAP384SHA384 (14)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 31 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP384SHA384 (14).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 73h0m0s and created on demand; the current one was made at 2026-10-20 23:43 UTC and expires at 2026-10-24 00:43 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

warn

36 records at the apex

Found

Read from
193.108.91.13:53
TypeValueTTL
SOAa26-64.akam.net. postmaster.dnb.nl. 580 43200 7200 604800 72007200
NSa1-13.akam.net.86400
NSa26-64.akam.net.86400
NSa18-66.akam.net.86400
NSa3-67.akam.net.86400
NSa5-64.akam.net.86400
NSa24-67.akam.net.86400
A2.16.204.2020
A2.16.204.2520
AAAA2a02:26f0:b700:5::210:cc1420
AAAA2a02:26f0:b700:5::210:cc1920
MX75 mail2.dnb.nl.7200
MX50 mail.dnb.nl.7200
TXT"pexip-portal-domain-verification=a11ca7dc-f9f6-4cea-8b3c-b982d1d60f6d"7200
TXT"v=spf1 a mx include:spf.dnb.nl include:spf.protection.outlook.com -all"7200
TXT"ms-domain-verification=9a77a844-b0d0-4613-af27-4cfb165c0cd5"7200
TXT"ms-domain-verification=0568291c-207e-4752-941a-6042d3b50b18"7200
TXT"pexip-ms-tenant-domain-verification=a11ca7dc-f9f6-4cea-8b3c-b982d1d60f6d"7200
TXT"MS685699"7200
TXT"MS554195"7200
TXT"MS647397"7200
TXT"google-site-verification=M-Zk5khhfhQCckKAowkRe6LAKMikqhGzDjJQgnNqXTE"7200
TXT"_lwps7vshslht0klijhrtju79c5q8g5z"7200
TXT"MS=86224684AD25A85FAD816FDD3DA526EDA6C3ED4D"7200
TXT"ms-domain-verification=db150717-5527-407a-b0b9-c4950a300e80"7200
TXT"QuoVadis=9f863345-ae71-44c7-ac8c-267bf3b18296"7200
TXT"d365mktkey=1z0cu85pkpks4945vrkx478gr"7200
TXT"cisco-ci-domain-verification=7f52ea608a43b2a3dd5999d08007e87b6d180f9ac64b8485fcce73d10c0b9b55"7200
TXT"msfpkey=7e4nuvgtvvd34spqfxtqqskmi"7200
TXT"MS064338"7200
TXT"MS959411"7200
TXT"QuoVadis=2ed23301-019a-40e9-8551-049ab5d7f3c3"7200
TXT"_ttvq9w44uowz1n46yrz0wxnw0wo29lk"7200
TXT"dnb.nl"7200
TXT"_we89kw1f1fm8roxw99yda24u96tqgsv"7200
TXT"ms-domain-verification=6dac95af-e66b-41a4-adc1-296367854afa"7200

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 1d; 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