imailbox.nl

Checked 22 October 2026, 13:52 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 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/imailbox.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/imailbox.nl returned HTTP 429
    #3

Delegation

pass

ns1.spothost.eu, ns2.spot.host, ns3.spothost.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns1.spothost.eu, ns2.spot.host, ns3.spothost.nl
NS in the zone
ns1.spothost.eu, ns2.spot.host, ns3.spothost.nl
NameserverAddressesNetwork (AS)Glue
ns1.spothost.eu185.58.57.1 2a01:310:8312:1046:185:58:57:1AS8312 ZYLON-AS - Bas Smit trading as Zylon, NL AS8312 ZYLON-AS - Bas Smit trading as Zylon, NL-
ns2.spot.host94.237.90.65 2a04:3542:1000:910:e0c3:50ff:feec:7ce7AS202053 UPCLOUD - UpCloud Ltd, FI AS202053 UPCLOUD - UpCloud Ltd, FI-
ns3.spothost.nl157.97.218.242 2a01:8580:2702:0:1009:0:242:1AS198089 IPVN-AS01 - IP Visie Networking B.V., NL AS198089 IPVN-AS01 - IP Visie Networking B.V., NL-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.spothost.eu, ns2.spot.host, ns3.spothost.nl.
  • ✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS198089 (IPVN-AS01 - IP Visie Networking B.V., NL): 2 addresses; AS202053 (UPCLOUD - UpCloud Ltd, FI): 2 addresses; AS8312 (ZYLON-AS - Bas Smit trading as Zylon, NL): 2 addresses.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .eu, .host, .nl.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.spothost.eu 185.58.57.1NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns1.spothost.eu 2a01:310:8312:1046:185:58:57:1NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns2.spot.host 94.237.90.65NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns2.spot.host 2a04:3542:1000:910:e0c3:50ff:feec:7ce7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3.spothost.nl 157.97.218.242NOERROR, 17 ms, authoritativenoyes / yesrefused-
ns3.spothost.nl 2a01:8580:2702:0:1009:0:242:1NOERROR, 15 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 6 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2023112200 · primary ns1.spothost.eu

Found

Primary (MNAME)
ns1.spothost.eu
Contact (RNAME)
hostmaster.imailbox.nl
Serial
2023112200
Refresh / retry
3600 s / 3600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.spothost.eu (185.58.57.1)2023112200
ns1.spothost.eu (2a01:310:8312:1046:185:58:57:1)2023112200
ns2.spot.host (94.237.90.65)2023112200
ns2.spot.host (2a04:3542:1000:910:e0c3:50ff:feec:7ce7)2023112200
ns3.spothost.nl (157.97.218.242)2023112200
ns3.spothost.nl (2a01:8580:2702:0:1009:0:242:1)2023112200

Checks

  • ✓ Serial 2023112200 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1h should be shorter than refresh 1h. Current values: refresh 1h, retry 1h, expire 14d, negative TTL 1d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.spothost.eu is one of the listed nameservers.
  • ✓ Contact hostmaster@imailbox.nl #25
    The SOA RNAME hostmaster.imailbox.nl means hostmaster@imailbox.nl.
  • ✓ Date-based serial #26
    The serial 2023112200 follows the YYYYMMDDnn convention (2023-11-22).

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

info

9 records at the apex

Found

Read from
185.58.57.1:53
TypeValueTTL
SOAns1.spothost.eu. hostmaster.imailbox.nl. 2023112200 3600 3600 1209600 864003600
NSns2.spot.host.3600
NSns3.spothost.nl.3600
NSns1.spothost.eu.3600
A185.58.56.2433600
AAAA2a01:310:8312:1046:185:58:56:2433600
AAAA2001:968:182::1033:13600
MX10 mail.imailbox.nl.3600
TXT"v=spf1 a mx ip4:185.58.56.243 ip6:2a01:310:8312:1046:185:58:56:243 ~all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 1h, NS 1h.
  • ✓ 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