Domain report: vzinfo.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.ssc-campus.nl, ns1.surfnet.nl, ns2.ssc-campus.nl, ns2.surfnet.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.ssc-campus.nl, ns1.surfnet.nl, ns2.ssc-campus.nl, ns2.surfnet.nl
NS in the zone: ns1.ssc-campus.nl, ns1.surfnet.nl, ns2.ssc-campus.nl, ns2.surfnet.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.ssc-campus.nl	131.224.2.135 2001:610:430:2::135	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	131.224.2.135 2001:610:430:2::135
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
ns2.ssc-campus.nl	131.224.2.136 2001:610:430:2::136	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	131.224.2.136 2001:610:430:2::136
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

Checks

✓ 4 nameservers #6

Delegated to ns1.ssc-campus.nl, ns1.surfnet.nl, ns2.ssc-campus.nl, ns2.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 3 IPv4 /24s and 3 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1103 (SURFNET-NL - SURF B.V., NL): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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

info

8 of 8 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.ssc-campus.nl 131.224.2.135	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns1.ssc-campus.nl 2001:610:430:2::135	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
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, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns2.ssc-campus.nl 131.224.2.136	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns2.ssc-campus.nl 2001:610:430:2::136	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns2.surfnet.nl 192.87.36.2	NOERROR, 12 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, 12 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"; ns2.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

info

serial 2014123979 · primary sscc-ddign-a01p.ddi.ssc-campus.nl

Found

Primary (MNAME): sscc-ddign-a01p.ddi.ssc-campus.nl
Contact (RNAME): hostmaster.vzinfo.nl
Serial: 2014123979
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns1.ssc-campus.nl (131.224.2.135)	2014123979
ns1.ssc-campus.nl (2001:610:430:2::135)	2014123979
ns1.surfnet.nl (192.87.106.101)	2014123979
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2014123979
ns2.ssc-campus.nl (131.224.2.136)	2014123979
ns2.ssc-campus.nl (2001:610:430:2::136)	2014123979
ns2.surfnet.nl (192.87.36.2)	2014123979
ns2.surfnet.nl (2001:610:3:200a:192:87:36:2)	2014123979

Checks

✓ Serial 2014123979 everywhere #22

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

SOA refresh 3h, retry 18m, expire 28d, negative TTL 15m.
i

Hidden master

The primary nameserver sscc-ddign-a01p.ddi.ssc-campus.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@vzinfo.nl #25

The SOA RNAME hostmaster.vzinfo.nl means hostmaster@vzinfo.nl.
✓ Timestamp serial #26

The serial 2014123979 is a Unix timestamp (2033-10-28 14:52 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 2-byte salt
Signatures valid until: 3 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
1297	RSASHA256 (8)	SHA256 6850CCC85D006087…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
41722	KSK (257)	RSASHA256 (8)
1297	KSK (257)	RSASHA256 (8)
15103	ZSK (256)	RSASHA256 (8)
10623	ZSK (256)	RSASHA256 (8)
9223	ZSK (256)	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 1297 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-03 #30

The earliest DNSKEY/SOA signature expires at 2026-11-03 18:35 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 2-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

info

11 records at the apex

Found

Read from: 131.224.2.135:53

Type	Value	TTL
SOA	sscc-ddign-a01p.ddi.ssc-campus.nl. hostmaster.vzinfo.nl. 2014123979 10800 1080 2419200 900	28800
NS	ns2.surfnet.nl.	28800
NS	ns2.ssc-campus.nl.	28800
NS	ns1.ssc-campus.nl.	28800
NS	ns1.surfnet.nl.	28800
A	131.224.244.81	300
AAAA	2001:610:430:ffff::18:127	300
MX	10 externemail.rivm.nl.	300
MX	50 externemail-mx2.rivm.nl.	300
TXT	"v=spf1 include:_spf1.rivm.nl -all"	28800
TXT	"HARICA-vN8J5TeW2vKQmj8J529"	28800

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 5m, NS 8h. The NS TTL at the parent is 1h and in the zone 8h; 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