ser.nl

Checked 21 October 2026, 21:25 UTC · via 8.8.8.8
iAll checks passed
28 passed 0 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/ser.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/ser.nl returned HTTP 429
    #3

Delegation

info

ns01.hostnet.nl, ns02.hostnet.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns01.hostnet.nl, ns02.hostnet.nl
NS in the zone
ns01.hostnet.nl, ns02.hostnet.nl
NameserverAddressesNetwork (AS)Glue
ns01.hostnet.nl195.206.121.13 2001:67c:28cc::13AS197495 ONECOM-INFRA - One.com A/S, DK AS197495 ONECOM-INFRA - One.com A/S, DK-
ns02.hostnet.nl185.10.11.13 2001:67c:3c0::13AS51468 ONECOM - One.com A/S, DK AS51468 ONECOM - One.com A/S, DK-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns01.hostnet.nl, ns02.hostnet.nl.
    #6
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS197495 (ONECOM-INFRA - One.com A/S, DK): 2 addresses; AS51468 (ONECOM - One.com A/S, DK): 2 addresses.
  • i
    All nameserver names under .nl
    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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.hostnet.nl 195.206.121.13NOERROR, 18 ms, authoritativenoyes / yesrefused-
ns01.hostnet.nl 2001:67c:28cc::13NOERROR, 18 ms, authoritativenoyes / yesrefused-
ns02.hostnet.nl 185.10.11.13NOERROR, 18 ms, authoritativenoyes / yesrefused-
ns02.hostnet.nl 2001:67c:3c0::13NOERROR, 18 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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

pass

serial 2026092501 · primary ns01.hostnet.nl

Found

Primary (MNAME)
ns01.hostnet.nl
Contact (RNAME)
hostmaster.hostnet.nl
Serial
2026092501
Refresh / retry
14400 s / 3600 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns01.hostnet.nl (195.206.121.13)2026092501
ns01.hostnet.nl (2001:67c:28cc::13)2026092501
ns02.hostnet.nl (185.10.11.13)2026092501
ns02.hostnet.nl (2001:67c:3c0::13)2026092501

Checks

  • ✓ Serial 2026092501 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 14d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.hostnet.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@hostnet.nl #25
    The SOA RNAME hostmaster.hostnet.nl means hostmaster@hostnet.nl.
  • ✓ Date-based serial #26
    The serial 2026092501 follows the YYYYMMDDnn convention (2026-09-25).

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
29 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
65034ECDSAP256SHA256 (13)SHA256 53CFF7837F4BD24C…yes

DNSKEY in the zone

Key tagRoleAlgorithm
65034KSK (257)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 65034 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

20 records at the apex

Found

Read from
195.206.121.13:53
TypeValueTTL
SOAns01.hostnet.nl. hostmaster.hostnet.nl. 2026092501 14400 3600 1209600 60014400
NSns01.hostnet.nl.14400
NSns02.hostnet.nl.14400
A108.141.5.154600
AAAA2603:1020:201:e::3c1600
MX0 ser-nl.mail.protection.outlook.com.600
TXT"8q1jwbd3yfmrs04cvzwm00tghg26vflt"600
TXT"mtnc72zc71327hxf2z33tkqs11y0qq5c"600
TXT"lqcihtpv60g6v80qqmuttkjum8"600
TXT"MS=ms80741456"600
TXT"google-site-verification=v-QlEQ72kIQPr-jooKq4b8XNsB59xByOj7KogeRbc1I"600
TXT"docusign=4b60b6c7-e339-4087-af00-a7114de19109"600
TXT"knowbe4-site-verification=7e4b40567668e0b3c44f3cc59ab336c5"600
TXT"apple-domain-verification=PA7I2HARPl07lzCD"600
TXT"afx/rTXcpJdKOeexUH5L+5jtiGcc9ReLOCugGVJGhQNmTs1P9lPDuK9uZPxitCjPgbPUNQlQVOyWRsMTCNjreg=="600
TXT"v=spf1 include:spf.sendinblue.com include:spf.topdesk.net include:spf.protection.outlook.com include:mailswitch.nl include:spf.afas.online include:_spf.spotler.email include:spf.tribecrm.nl include:_spf.createsend.com -all"600
TXT"Sendinblue-code:58d254059ac06520d90a254ee3a46af2"600
TXT"ciscocidomainverification=84d7901e625c5818655bd4be5d7c0a571ddbf4220a5c5b8f29398e7c1ea7a9f"600
TXT"ain8m48lpbnpn7f8fhdgga6163"600
TXT"MS=16813AE083E6DC093FF9A728C3A608EFC2EFF177"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, AAAA 10m, MX 10m, NS 4h. The NS TTL at the parent is 1h and in the zone 4h; 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.
  • 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