Domain report: surf.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

pass

ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl
NS in the zone: ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.surfnet.nl	192.87.106.101 2001:610:1:800a:192:87:106:101	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.106.101 2001:610:1:800a:192:87:106:101
ns1.zurich.surf.net	195.176.255.9 2001:620:0:9::1103	AS559 Switch - SWITCH, CH AS559 Switch - SWITCH, CH	-
ns2.surfnet.nl	192.87.36.2 2001:610:3:200a:192:87:36:2	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.36.2 2001:610:3:200a:192:87:36:2
ns3.surfnet.nl	195.169.124.71 2001:610:0:800c:195:169:124:71	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	195.169.124.71 2001:610:0:800c:195:169:124:71

Checks

✓ 4 nameservers #6

Delegated to ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.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 4 IPv4 /24s and 4 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 6 addresses; AS559 (Switch - SWITCH, CH): 2 addresses.
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .net, .nl.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.surfnet.nl 192.87.106.101	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.surfnet.nl 2001:610:1:800a:192:87:106:101	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.zurich.surf.net 195.176.255.9	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns1.zurich.surf.net 2001:620:0:9::1103	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns2.surfnet.nl 192.87.36.2	NOERROR, 14 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns2.surfnet.nl 2001:610:3:200a:192:87:36:2	NOERROR, 14 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns3.surfnet.nl 195.169.124.71	NOERROR, 12 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns3.surfnet.nl 2001:610:0:800c:195:169:124:71	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl

Checks

✓ All respond #14

All 8 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.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns1.zurich.surf.net: "This is a SURFnet nameserver - dns-beheer@surf.nl"; ns2.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns3.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl".

#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

pass

serial 2026102101 · primary ns1.surfnet.nl

Found

Primary (MNAME): ns1.surfnet.nl
Contact (RNAME): dns-beheer.surf.nl
Serial: 2026102101
Refresh / retry: 10800 s / 3600 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns1.surfnet.nl (192.87.106.101)	2026102101
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2026102101
ns1.zurich.surf.net (195.176.255.9)	2026102101
ns1.zurich.surf.net (2001:620:0:9::1103)	2026102101
ns2.surfnet.nl (192.87.36.2)	2026102101
ns2.surfnet.nl (2001:610:3:200a:192:87:36:2)	2026102101
ns3.surfnet.nl (195.169.124.71)	2026102101
ns3.surfnet.nl (2001:610:0:800c:195:169:124:71)	2026102101

Checks

✓ Serial 2026102101 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver ns1.surfnet.nl is one of the listed nameservers.
✓ Contact dns-beheer@surf.nl #25

The SOA RNAME dns-beheer.surf.nl means dns-beheer@surf.nl.
✓ Date-based serial #26

The serial 2026102101 follows the YYYYMMDDnn convention (2026-10-21).

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 tag	Algorithm	Digest	Matches a key
58740	ECDSAP256SHA256 (13)	SHA256 487E2E0415E08343…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
58740	KSK (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 58740 (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

pass

20 records at the apex

Found

Read from: 192.87.106.101:53

Type	Value	TTL
SOA	ns1.surfnet.nl. dns-beheer.surf.nl. 2026102101 10800 3600 604800 3600	3600
NS	ns1.surfnet.nl.	3600
NS	ns2.surfnet.nl.	3600
NS	ns1.zurich.surf.net.	3600
NS	ns3.surfnet.nl.	3600
A	192.87.108.15	900
AAAA	2001:610:508:108:192:87:108:15	900
MX	10 surf-nl.mail.protection.outlook.com.	3600
TXT	"v=spf1 include:mailplus.nl include:soverin.net include:spf.protection.outlook.com include:spf.surf.nl include:mail.zendesk.com include:_spf.emply.com ~all"	3600
TXT	"LwdgkMB+IUPOT7+0YXpUA6xInAPm/QkgJGuSci6msn1oZh76zdu2DuXkol9DSKQ4S50VZhZAxZvfRqwpaD7pCw=="	3600
TXT	"google-site-verification=eBmfmfF08EHY7J6CNUWO3k_iKc1hisioiNIYDZ7l3nc"	3600
TXT	"MS=ms58073161"	3600
TXT	"apple-domain-verification=g7uZuYdCUCKUQJEh"	3600
TXT	"4KpnMi9KFXJveaqCcl7taNkGhTxHDB0ITMkEidiOEJa5vdx2+L/on3nrIAGKkvhZ8dnPomZoqaZK3Dhp+a9Ilg=="	3600
TXT	"HARICA-VWehW3vMzUEjKiV5qUi"	3600
TXT	"mentimeter-5e1dbed6-22e8-40bb-983d-cfb0d2f07fcd"	3600
TXT	"adobe-idp-site-verification=bb247cf6e0162a264df1886109d59464c0de78dd3f1e04091bca1c4bf93d10cd"	3600
TXT	"bw=vBRo1av7Hlff58uTo8JYIGGG1dVp67IqBa9Et9JaLpnr"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 issue "letsencrypt.org"	3600

Checks

✓ TTLs within range #32

TTLs: A 15m, AAAA 15m, 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.
✓ CAA restricts issuance #35

Certificates may be issued by: harica.gr, letsencrypt.org.