stack.nl

Checked 21 October 2026, 21:25 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 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/stack.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/stack.nl returned HTTP 429
    #3

Delegation

info

ns.gletsjer.org, ns0.zlo.nu, ns1.brainslugs.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns.gletsjer.org, ns0.zlo.nu, ns1.brainslugs.net
NS in the zone
ns.gletsjer.org, ns0.zlo.nu, ns1.brainslugs.net
NameserverAddressesNetwork (AS)Glue
ns.gletsjer.org81.171.29.230 2001:1af8:4700:a0b9:345:0:8802:53AS60781 LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL AS60781 LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL-
ns0.zlo.nu85.17.179.9 2001:1af8:5301:127:1c00:9bff:fe00:1a23AS60781 LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL AS60781 LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL-
ns1.brainslugs.net161.97.122.84AS51167 CONTABO - Contabo GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.gletsjer.org, ns0.zlo.nu, ns1.brainslugs.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS51167 (CONTABO - Contabo GmbH, DE): 1 address; AS60781 (LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL): 4 addresses.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .net, .nu, .org.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.brainslugs.net.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.gletsjer.org 81.171.29.230NOERROR, 10 ms, authoritativenoyes / yesrefusedunknown
ns.gletsjer.org 2001:1af8:4700:a0b9:345:0:8802:53NOERROR, 10 ms, authoritativenoyes / yesrefusedunknown
ns0.zlo.nu 85.17.179.9NOERROR, 16 ms, authoritativenoyes / yesrefused9.20.24-1ubuntu0.4-Ubuntu
ns0.zlo.nu 2001:1af8:5301:127:1c00:9bff:fe00:1a23NOERROR, 16 ms, authoritativenoyes / yesrefused9.20.24-1ubuntu0.4-Ubuntu
ns1.brainslugs.net 161.97.122.84NOERROR, 10 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.2-Ubuntu

Checks

  • ✓ All respond #14
    All 5 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: ns0.zlo.nu: "9.20.24-1ubuntu0.4-Ubuntu"; ns1.brainslugs.net: "9.18.39-0ubuntu0.22.04.2-Ubuntu". 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

info

serial 2026031800 · primary ecc.stack.nl

Found

Primary (MNAME)
ecc.stack.nl
Contact (RNAME)
hostmaster.stack.nl
Serial
2026031800
Refresh / retry
14400 s / 7200 s
Expire
1209600 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns.gletsjer.org (81.171.29.230)2026031800
ns.gletsjer.org (2001:1af8:4700:a0b9:345:0:8802:53)2026031800
ns0.zlo.nu (85.17.179.9)2026031800
ns0.zlo.nu (2001:1af8:5301:127:1c00:9bff:fe00:1a23)2026031800
ns1.brainslugs.net (161.97.122.84)2026031800

Checks

  • ✓ Serial 2026031800 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 2h, expire 14d, negative TTL 15m.
  • i
    Hidden master
    The primary nameserver ecc.stack.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 hostmaster@stack.nl #25
    The SOA RNAME hostmaster.stack.nl means hostmaster@stack.nl.
  • ✓ Date-based serial #26
    The serial 2026031800 follows the YYYYMMDDnn convention (2026-03-18).

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

7 records at the apex

Found

Read from
81.171.29.230:53
TypeValueTTL
SOAecc.stack.nl. hostmaster.stack.nl. 2026031800 14400 7200 1209600 90086400
NSns.gletsjer.org.86400
NSns0.zlo.nu.86400
NSns1.brainslugs.net.86400
MX10 mail03.stack.nl.3600
TXT"v=spf1 redirect=spf.stack.nl"3600
TXT"ECC STACK is a computer association in Eindhoven, The Netherlands"3600

Checks

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