svb.nl

Checked 21 October 2026, 21:25 UTC · via 8.8.8.8
!Passed with warnings
27 passed 3 warnings 0 failed 3 info

Registration

info

.nl country-code

Found

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

Delegation

warn

a1-243.akam.net, a10-64.akam.net, a12-67.akam.net, a13-65.akam.net, ns1.f5clouddns.com, ns2.f5clouddns.com

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
a1-243.akam.net, a10-64.akam.net, a12-67.akam.net, a13-65.akam.net, ns1.f5clouddns.com, ns2.f5clouddns.com
NS in the zone
a1-243.akam.net, a10-64.akam.net, a12-67.akam.net, a13-65.akam.net, a26-66.akam.net, a5-67.akam.net, ns1.f5clouddns.com, ns2.f5clouddns.com
NameserverAddressesNetwork (AS)Glue
a1-243.akam.net193.108.91.243 2600:1401:2::f3AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a10-64.akam.net96.7.50.64 2600:1480:d000::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-
a13-65.akam.net2.22.230.65 2600:1480:800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a26-66.akam.net (zone only)23.74.25.66 2600:1480:b800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-67.akam.net (zone only)95.100.168.67 2600:1480:b000::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
ns1.f5clouddns.com107.162.234.197 2604:e180:1071::3:1AS55002 DEFENSE-NET - F5, Inc., US AS55002 DEFENSE-NET - F5, Inc., US-
ns2.f5clouddns.com107.162.176.221 2604:e180:1071::ffff:6ba2:b0ddAS55002 DEFENSE-NET - F5, Inc., US AS55002 DEFENSE-NET - F5, Inc., US-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-243.akam.net, a10-64.akam.net, a12-67.akam.net, a13-65.akam.net, ns1.f5clouddns.com, ns2.f5clouddns.com.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: a26-66.akam.net, a5-67.akam.net. a1-243.akam.net, a10-64.akam.net, a12-67.akam.net, a13-65.akam.net, a26-66.akam.net, a5-67.akam.net, ns1.f5clouddns.com, ns2.f5clouddns.com report NS a1-243.akam.net a10-64.akam.net a12-67.akam.net a13-65.akam.net a26-66.akam.net a5-67.akam.net ns1.f5clouddns.com ns2.f5clouddns.com.
    #7
  • ✓ 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 8 IPv4 /24s and 7 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 12 addresses; AS55002 (DEFENSE-NET - F5, Inc., US): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

16 of 16 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-243.akam.net 193.108.91.243NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a1-243.akam.net 2600:1401:2::f3NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a10-64.akam.net 96.7.50.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.26
a10-64.akam.net 2600:1480:d000::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a12-67.akam.net 184.26.160.67NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a12-67.akam.net 2600:1480:f000::43NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a13-65.akam.net 2.22.230.65NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a13-65.akam.net 2600:1480:800::41NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a26-66.akam.net 23.74.25.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.26
a26-66.akam.net 2600:1480:b800::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a5-67.akam.net 95.100.168.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.9
a5-67.akam.net 2600:1480:b000::43NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
ns1.f5clouddns.com 107.162.234.197NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.f5clouddns.com 2604:e180:1071::3:1NOERROR, 168 ms, authoritativenoyes / yesrefused-
ns2.f5clouddns.com 107.162.176.221NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns2.f5clouddns.com 2604:e180:1071::ffff:6ba2:b0ddNOERROR, 57 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 16 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: a1-243.akam.net: "41824.8"; a1-243.akam.net: "41824.9"; a10-64.akam.net: "48878.26"; a10-64.akam.net: "48878.29"; a12-67.akam.net: "48878.30"; a12-67.akam.net: "48878.32"; a13-65.akam.net: "41824.4"; a13-65.akam.net: "41824.7"; a26-66.akam.net: "48878.26"; a26-66.akam.net: "48878.30"; a5-67.akam.net: "41824.9"; a5-67.akam.net: "41824.8". 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

warn

serial 2012293515 · primary ns1.svb.nl

Found

Primary (MNAME)
ns1.svb.nl
Contact (RNAME)
ict\.verbindingen.svb.nl
Serial
2012293515
Refresh / retry
10800 s / 3600 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
a1-243.akam.net (193.108.91.243)2012293515
a1-243.akam.net (2600:1401:2::f3)2012293515
a10-64.akam.net (96.7.50.64)2012293515
a10-64.akam.net (2600:1480:d000::40)2012293515
a12-67.akam.net (184.26.160.67)2012293515
a12-67.akam.net (2600:1480:f000::43)2012293515
a13-65.akam.net (2.22.230.65)2012293515
a13-65.akam.net (2600:1480:800::41)2012293515
a26-66.akam.net (23.74.25.66)2012293515
a26-66.akam.net (2600:1480:b800::42)2012293515
a5-67.akam.net (95.100.168.67)2012293515
a5-67.akam.net (2600:1480:b000::43)2012293515
ns1.f5clouddns.com (107.162.234.197)2012293513
ns1.f5clouddns.com (2604:e180:1071::3:1)2012293513
ns2.f5clouddns.com (107.162.176.221)2012293513
ns2.f5clouddns.com (2604:e180:1071::ffff:6ba2:b0dd)2012293513

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2012293513 on ns1.f5clouddns.com (107.162.234.197), ns1.f5clouddns.com (2604:e180:1071::3:1), ns2.f5clouddns.com (107.162.176.221), ns2.f5clouddns.com (2604:e180:1071::ffff:6ba2:b0dd); 2012293515 on a1-243.akam.net (193.108.91.243), a1-243.akam.net (2600:1401:2::f3), a10-64.akam.net (96.7.50.64), a10-64.akam.net (2600:1480:d000::40), a12-67.akam.net (184.26.160.67), a12-67.akam.net (2600:1480:f000::43), a13-65.akam.net (2.22.230.65), a13-65.akam.net (2600:1480:800::41), a26-66.akam.net (23.74.25.66), a26-66.akam.net (2600:1480:b800::42), a5-67.akam.net (95.100.168.67), a5-67.akam.net (2600:1480:b000::43). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 28d, negative TTL 15m.
  • i
    Hidden master
    The primary nameserver ns1.svb.nl is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact ict.verbindingen@svb.nl #25
    The SOA RNAME ict\.verbindingen.svb.nl means ict.verbindingen@svb.nl.
  • ✓ Timestamp serial #26
    The serial 2012293515 is a Unix timestamp (2033-10-07 10:25 UTC).

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
36884ECDSAP256SHA256 (13)SHA256 A43982BEBDD94D5C…yes

DNSKEY in the zone

Key tagRoleAlgorithm
36884KSK (257)ECDSAP256SHA256 (13)
2883ZSK (256)ECDSAP256SHA256 (13)
15767ZSK (256)ECDSAP256SHA256 (13)
19461ZSK (256)ECDSAP256SHA256 (13)

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 36884 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-20 22:40 UTC and expires at 2026-10-24 22:47 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

pass

32 records at the apex

Found

Read from
193.108.91.243:53
TypeValueTTL
SOAns1.svb.nl. ict\.verbindingen.svb.nl. 2012293515 10800 3600 2419200 90028800
NSa26-66.akam.net.28800
NSa5-67.akam.net.28800
NSa10-64.akam.net.28800
NSns2.f5clouddns.com.28800
NSa13-65.akam.net.28800
NSa1-243.akam.net.28800
NSns1.f5clouddns.com.28800
NSa12-67.akam.net.28800
A145.83.4.32600
AAAA2a07:3502:1191::10600
MX10 svb-nl.l-v1.mx.microsoft.300
TXT"v=spf1 include:spf.protection.outlook.com include:_spf.ezorg.nl include:spf.svb.nl.eu-pg7ngi0h.e1.dspf.app -all"300
TXT"_6co7m11bldbimtv1o23rundhd8n69lm"300
TXT"atlassian-domain-verification=r6USLqbJWsWDNLIK7dmNDlaZ/azMyHw/bJzFSQYbwiHJTwlB9rmEijSgD1/Cxnb6"300
TXT"atlassian-domain-verification=lq8IV+4Fvtv6lJ2/Je1xgC6zeOVsReV156ZUu1njljYga3ah6xpTxOfnDA3BwXp2"300
TXT"fa5f7c0a89c406e03527aaa4c0bf0853bacd17b16d4bab2155440d8bb932548c"300
TXT"u67tqIVmiYlW6HjUaqVH+S7n4fUX/XPYO2AwmG1LnXOnPxK66GPqXbqih8OULIJWlVvS/tbdNc4vrTZljhjJyw=="300
TXT"google-site-verification=v5ThvyhKzotKBmjno8yGiIHcQCfwO19ISi1f4qFD6TI"300
TXT"google-site-verification=r_npeoz1xhra9m2DWUfNwCh_PRLXUvJQR_ZRmtwhA64"300
TXT"QuoVadis=78706aaf-d9d7-4da4-b0f9-95bf808403c5"300
TXT"atlassian-sending-domain-verification=2c9063c7-998f-4349-bc7c-ab10ea79a91c"300
TXT"miro-verification=3051639a8c8c37c0e567ae79f32486268412804f"300
TXT"MS=B3BF4308CCD03255BB8A6045D86B8A4386CDD824"300
TXT"_szqeu1mq24mapfuyftmrexhe6ut2iue"300
TXT"_5j86qonkqcavcm3rac3josy8in0yopb"300
CAA128 issue "digicert.com"300
CAA128 iodef "mailto:soc@svb.nl"300
CAA128 issue "pkioverheid.nl"300
CAA128 issue "kpn.com"300
CAA128 issue "letsencrypt.org"300
CAA128 issue "certsign.ro"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, AAAA 10m, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, pkioverheid.nl, kpn.com, letsencrypt.org, certsign.ro.