wkap.nl

Checked 21 October 2026, 21:26 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 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/wkap.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/wkap.nl returned HTTP 429
    #3

Delegation

info

pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk
NS in the zone
pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk
NameserverAddressesNetwork (AS)Glue
pdns1.ultradns.net204.74.108.1 2001:502:f3ff::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns2.ultradns.net204.74.109.1 2610:a1:1014::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns3.ultradns.org199.7.68.1 2610:a1:1015::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns4.ultradns.org199.7.69.1 2001:502:4612::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns5.ultradns.info204.74.114.1 2610:a1:1016::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns6.ultradns.co.uk204.74.115.1 2610:a1:1017::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-

Checks

  • ✓ 6 nameservers #6
    Delegated to pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk.
  • ✓ 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 (AS12008 (VERCARA - Vercara, LLC, US): 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
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .info, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pdns1.ultradns.net 204.74.108.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns1.ultradns.net 2001:502:f3ff::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 204.74.109.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 2610:a1:1014::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns3.ultradns.org 199.7.68.1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns3.ultradns.org 2610:a1:1015::1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns4.ultradns.org 199.7.69.1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns4.ultradns.org 2001:502:4612::1NOERROR, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 204.74.114.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 2610:a1:1016::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 204.74.115.1NOERROR, 13 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 2610:a1:1017::1NOERROR, 13 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: pdns1.ultradns.net: "UltraDNS Nameserver"; pdns2.ultradns.net: "UltraDNS Nameserver"; pdns3.ultradns.org: "UltraDNS Nameserver"; pdns4.ultradns.org: "UltraDNS Nameserver"; pdns5.ultradns.info: "UltraDNS Nameserver"; pdns6.ultradns.co.uk: "UltraDNS Nameserver".
    #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 2020122210 · primary pdns1.ultradns.net

Found

Primary (MNAME)
pdns1.ultradns.net
Contact (RNAME)
hostmaster.springernature.com
Serial
2020122210
Refresh / retry
86400 s / 86400 s
Expire
86400 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
pdns1.ultradns.net (204.74.108.1)2020122210
pdns1.ultradns.net (2001:502:f3ff::1)2020122210
pdns2.ultradns.net (204.74.109.1)2020122210
pdns2.ultradns.net (2610:a1:1014::1)2020122210
pdns3.ultradns.org (199.7.68.1)2020122210
pdns3.ultradns.org (2610:a1:1015::1)2020122210
pdns4.ultradns.org (199.7.69.1)2020122210
pdns4.ultradns.org (2001:502:4612::1)2020122210
pdns5.ultradns.info (204.74.114.1)2020122210
pdns5.ultradns.info (2610:a1:1016::1)2020122210
pdns6.ultradns.co.uk (204.74.115.1)2020122210
pdns6.ultradns.co.uk (2610:a1:1017::1)2020122210

Checks

  • ✓ Serial 2020122210 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1d should be shorter than refresh 1d; expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1d must be longer than refresh + retry. Current values: refresh 1d, retry 1d, expire 1d, negative TTL 1d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver pdns1.ultradns.net is one of the listed nameservers.
  • ✓ Contact hostmaster@springernature.com #25
    The SOA RNAME hostmaster.springernature.com means hostmaster@springernature.com.
  • ✓ Date-based serial #26
    The serial 2020122210 follows the YYYYMMDDnn convention (2020-12-22).

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

warn

9 records at the apex

Found

Read from
204.74.108.1:53
TypeValueTTL
SOApdns1.ultradns.net. hostmaster.springernature.com. 2020122210 86400 86400 86400 8640086400
NSpdns1.ultradns.net.86400
NSpdns2.ultradns.net.86400
NSpdns3.ultradns.org.86400
NSpdns4.ultradns.org.86400
NSpdns5.ultradns.info.86400
NSpdns6.ultradns.co.uk.86400
A146.75.116.9523
TXT"v=spf1 ip4:195.128.10.15/32 ip4:195.128.10.18/32 ip4:199.168.14.54/32 ip4:46.19.34.245/32 include:spf-002c5801.pphosted.com -all"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (23s). 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