Domain report: ifv.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.dnstools.nl, ns2.dnstools.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.dnstools.nl, ns2.dnstools.nl
NS in the zone: ns1.dnstools.nl, ns2.dnstools.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.dnstools.nl	81.26.219.100 2a02:728:e:66::100	AS31673 UNISERVER-AS - Uniserver Internet B.V., NL AS31673 UNISERVER-AS - Uniserver Internet B.V., NL	81.26.219.100 2a02:728:e:66::100
ns2.dnstools.nl	81.26.208.160 2a02:728:e:758::160	AS31673 UNISERVER-AS - Uniserver Internet B.V., NL AS31673 UNISERVER-AS - Uniserver Internet B.V., NL	81.26.208.160 2a02:728:e:758::160

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.dnstools.nl, ns2.dnstools.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.
i

One address family in one network

all IPv6 addresses are in 2a02:728:e::/48, while the other address family is spread over several networks.

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS31673 (UNISERVER-AS - Uniserver Internet B.V., NL): 4 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

warn

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.dnstools.nl 81.26.219.100	NOERROR, 10 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.7.4 (built Apr 17 2023 07:23:58 by root@3aa022a45e3d)
ns1.dnstools.nl 2a02:728:e:66::100	NOERROR, 16 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.7.4 (built Apr 17 2023 07:23:58 by root@3aa022a45e3d)
ns2.dnstools.nl 81.26.208.160	NOERROR, 10 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.7.4 (built Apr 17 2023 07:23:58 by root@3aa022a45e3d)
ns2.dnstools.nl 2a02:728:e:758::160	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.7.4 (built Apr 17 2023 07:23:58 by root@3aa022a45e3d)

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.
!

Software version disclosed

These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.dnstools.nl: "PowerDNS Authoritative Server 4.7.4 (built Apr 17 2023 07:23:58 by root@3aa022a45e3d)"; ns2.dnstools.nl: "PowerDNS Authoritative Server 4.7.4 (built Apr 17 2023 07:23:58 by root@3aa022a45e3d)". 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

pass

serial 2024011101 · primary ns1.dnstools.nl

Found

Primary (MNAME): ns1.dnstools.nl
Contact (RNAME): webmaster.nifv.nl
Serial: 2024011101
Refresh / retry: 10800 s / 3600 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns1.dnstools.nl (81.26.219.100)	2024011101
ns1.dnstools.nl (2a02:728:e:66::100)	2024011101
ns2.dnstools.nl (81.26.208.160)	2024011101
ns2.dnstools.nl (2a02:728:e:758::160)	2024011101

Checks

✓ Serial 2024011101 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.dnstools.nl is one of the listed nameservers.
✓ Contact webmaster@nifv.nl #25

The SOA RNAME webmaster.nifv.nl means webmaster@nifv.nl.
✓ Date-based serial #26

The serial 2024011101 follows the YYYYMMDDnn convention (2024-01-11).

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: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
4058	ECDSAP256SHA256 (13)	SHA256 931051304E606B48…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
4058	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 4058 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-05 #30

The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 UTC.
✓ NSEC3 as recommended #31

The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

13 records at the apex

Found

Read from: 81.26.219.100:53

Type	Value	TTL
SOA	ns1.dnstools.nl. webmaster.nifv.nl. 2024011101 10800 3600 604800 3600	3600
NS	ns1.dnstools.nl.	3600
NS	ns2.dnstools.nl.	3600
A	185.99.205.201	3600
A	185.99.205.202	3600
AAAA	2a06:1480:5ec:b30::1b:1002	3600
AAAA	2a06:1480:5ec:b30::1b:1001	3600
MX	10 ifv-nl.t-v1.mx.microsoft.	3600
TXT	"MS=ms96386241"	3600
TXT	"9WxcQtkW53LQY/gQ9yrOl5/BJJqxvmojQnP9WxY/MfM="	3600
TXT	"FV9j0YsHQ8tSEICabvCK94QvVWZhBK+f3EY6f2dkzHPhkpePwcXnaSlPi3Ippvfmlkco1Yl0A7nzUb/NKDZKwg=="	3600
TXT	"E/BfYRt2W3HfUz64WudLpJIGh4nKeEybV4cwmXeVi4xWQLovcqb8guXx6feJEfqCQfEE2CV05np8cGIus8Zg0g=="	3600
TXT	"v=spf1 a mx include:spf.protection.outlook.com ip4:199.255.192.0/22 ip4:199.127.232.0/22 ip4:54.240.0.0/18 ip4:69.169.224.0/20 ip4:23.249.208.0/20 ip4:23.251.224.0/19 ip4:76.223.176.0/20 ip4:54.240.64.0/19 include:spf1.ifv.nl include:spf2.ifv.nl -all"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 1h, 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.
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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