Domain report: slo.nl

Registration

info

.nl country-code

Found

TLD: .nl (country-code)
ICANN policies apply: no

Lookup error: https://rdap.sidn.nl/domain/slo.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/slo.nl returned HTTP 429

#3

Delegation

warn

ns1.dn-s.nl, ns2.dn-s.be, ns3.dn-s.eu, ns4.dn-s.org

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.dn-s.nl, ns2.dn-s.be, ns3.dn-s.eu, ns4.dn-s.org
NS in the zone: ns1.dn-s.nl, ns2.dn-s.nl, ns3.dn-s.nl, ns4.dn-s.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.dn-s.nl	185.104.28.19 2a06:2ec0:1::10	AS206281 AS-ZXCS - Stichting DIGI NL, NL AS206281 AS-ZXCS - Stichting DIGI NL, NL	-
ns2.dn-s.be (parent only)	46.101.179.64 2a03:b0c0:3:d0::116:2001	AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US	-
ns2.dn-s.nl (zone only)	46.101.179.64 2a03:b0c0:3:d0::116:2001	AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US	-
ns3.dn-s.eu (parent only)	178.62.208.8 2a03:b0c0:2:d0::57:1001	AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US	-
ns3.dn-s.nl (zone only)	178.62.208.8 2a03:b0c0:2:d0::57:1001	AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC, US	-
ns4.dn-s.nl (zone only)	185.220.172.14 2a06:2ec0:1:a::d53	AS206281 AS-ZXCS - Stichting DIGI NL, NL AS206281 AS-ZXCS - Stichting DIGI NL, NL	-
ns4.dn-s.org (parent only)	185.220.172.14 2a06:2ec0:1:a::d53	AS206281 AS-ZXCS - Stichting DIGI NL, NL AS206281 AS-ZXCS - Stichting DIGI NL, NL	-

Checks

✓ 4 nameservers #6

Delegated to ns1.dn-s.nl, ns2.dn-s.be, ns3.dn-s.eu, ns4.dn-s.org.
!

NS sets differ

The nameservers at the parent and in the zone should be the same. Only at the parent: ns2.dn-s.be, ns3.dn-s.eu, ns4.dn-s.org; only in the zone: ns2.dn-s.nl, ns3.dn-s.nl, ns4.dn-s.nl. ns1.dn-s.nl, ns2.dn-s.be, ns2.dn-s.nl, ns3.dn-s.eu, ns3.dn-s.nl, ns4.dn-s.nl, ns4.dn-s.org report NS ns1.dn-s.nl ns2.dn-s.nl ns3.dn-s.nl ns4.dn-s.nl.

#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 4 IPv4 /24s and 3 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS14061 (DIGITALOCEAN-ASN - DigitalOcean, LLC, US): 8 addresses; AS206281 (AS-ZXCS - Stichting DIGI NL, NL): 6 addresses.
✓ Nameserver names under 4 TLDs #12

Nameserver names use the TLDs .be, .eu, .nl, .org.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

14 of 14 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.dn-s.nl 185.104.28.19	NOERROR, 14 ms, authoritative	no	yes / yes	refused	Unknown
ns1.dn-s.nl 2a06:2ec0:1::10	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Unknown
ns2.dn-s.be 46.101.179.64	NOERROR, 3 ms, authoritative	no	yes / yes	refused	Unknown
ns2.dn-s.be 2a03:b0c0:3:d0::116:2001	NOERROR, 4 ms, authoritative	no	yes / yes	refused	Unknown
ns2.dn-s.nl 46.101.179.64	NOERROR, 22 ms, authoritative	no	yes / yes	refused	Unknown
ns2.dn-s.nl 2a03:b0c0:3:d0::116:2001	NOERROR, 13 ms, authoritative	no	yes / yes	refused	Unknown
ns3.dn-s.eu 178.62.208.8	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Unknown
ns3.dn-s.eu 2a03:b0c0:2:d0::57:1001	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Unknown
ns3.dn-s.nl 178.62.208.8	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Unknown
ns3.dn-s.nl 2a03:b0c0:2:d0::57:1001	NOERROR, 14 ms, authoritative	no	yes / yes	refused	Unknown
ns4.dn-s.nl 185.220.172.14	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Unknown
ns4.dn-s.nl 2a06:2ec0:1:a::d53	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Unknown
ns4.dn-s.org 185.220.172.14	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Unknown
ns4.dn-s.org 2a06:2ec0:1:a::d53	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Unknown

Checks

✓ All respond #14

All 14 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: ns1.dn-s.nl: "Unknown"; ns2.dn-s.be: "Unknown"; ns2.dn-s.nl: "Unknown"; ns3.dn-s.eu: "Unknown"; ns3.dn-s.nl: "Unknown"; ns4.dn-s.nl: "Unknown"; ns4.dn-s.org: "Unknown".

#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 2026070801 · primary ns1.dn-s.nl

Found

Primary (MNAME): ns1.dn-s.nl
Contact (RNAME): hostmaster.slo.nl
Serial: 2026070801
Refresh / retry: 600 s / 3600 s
Expire: 1209600 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns1.dn-s.nl (185.104.28.19)	2026070801
ns1.dn-s.nl (2a06:2ec0:1::10)	2026070801
ns2.dn-s.be (46.101.179.64)	2026070801
ns2.dn-s.be (2a03:b0c0:3:d0::116:2001)	2026070801
ns2.dn-s.nl (46.101.179.64)	2026070801
ns2.dn-s.nl (2a03:b0c0:3:d0::116:2001)	2026070801
ns3.dn-s.eu (178.62.208.8)	2026070801
ns3.dn-s.eu (2a03:b0c0:2:d0::57:1001)	2026070801
ns3.dn-s.nl (178.62.208.8)	2026070801
ns3.dn-s.nl (2a03:b0c0:2:d0::57:1001)	2026070801
ns4.dn-s.nl (185.220.172.14)	2026070801
ns4.dn-s.nl (2a06:2ec0:1:a::d53)	2026070801
ns4.dn-s.org (185.220.172.14)	2026070801
ns4.dn-s.org (2a06:2ec0:1:a::d53)	2026070801

Checks

✓ Serial 2026070801 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

refresh 10m is outside 20m–1d; retry 1h should be shorter than refresh 10m. Current values: refresh 10m, retry 1h, expire 14d, negative TTL 1d.

#23
✓ Primary is a public nameserver #24

The primary nameserver ns1.dn-s.nl is one of the listed nameservers.
✓ Contact hostmaster@slo.nl #25

The SOA RNAME hostmaster.slo.nl means hostmaster@slo.nl.
✓ Date-based serial #26

The serial 2026070801 follows the YYYYMMDDnn convention (2026-07-08).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
49312	RSASHA256 (8)	SHA256 D5938201788F7095…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
49312	KSK (257)	RSASHA256 (8)

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 49312 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-10-29 #30

The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
i

NSEC

The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.

#31

Records

info

9 records at the apex

Found

Read from: 185.104.28.19:53

Type	Value	TTL
SOA	ns1.dn-s.nl. hostmaster.slo.nl. 2026070801 600 3600 1209600 86400	86400
NS	ns3.dn-s.nl.	300
NS	ns4.dn-s.nl.	300
NS	ns1.dn-s.nl.	300
NS	ns2.dn-s.nl.	300
A	185.38.232.198	300
AAAA	2a02:720:9:8::198	300
MX	10 slo-nl.mail.protection.outlook.com.	300
TXT	"v=spf1 include:spf.protection.outlook.com include:spf.afas.online include:spf.mailjet.com include:_spf.iprox.nl -all"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 5m, NS 5m. The NS TTL at the parent is 1h and in the zone 5m; 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