Domain report: oor.nl

Registration

info

.nl country-code

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

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/oor.nl returned HTTP 429

#3

warn

ns01.a1.nl, ns02.a1.nl, ns03.a1.nl

Nameserver	Addresses	Network (AS)	Glue
ns01.a1.nl	213.171.66.10	AS211251 A1-DC - A1 Internet BV, NL	213.171.66.10
ns02.a1.nl	213.171.65.10	AS211251 A1-DC - A1 Internet BV, NL	213.171.65.10
ns03.a1.nl	213.171.71.10	AS203966 a1-as - A1 Internet BV, NL	213.171.71.10

✓ 3 nameservers #6

Delegated to ns01.a1.nl, ns02.a1.nl, ns03.a1.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 0 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS203966 (a1-as - A1 Internet BV, NL): 1 address; AS211251 (A1-DC - A1 Internet BV, NL): 2 addresses.
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
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

warn

3 of 3 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns01.a1.nl 213.171.66.10	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns02.a1.nl 213.171.65.10	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns03.a1.nl 213.171.71.10	NOERROR, 12 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 5.0.2

✓ All respond #14

All 3 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: ns03.a1.nl: "PowerDNS Authoritative Server 5.0.2". 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.

warn

serial 2026102201 · primary ns01.a1.nl

✓ Serial 2026102201 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

retry 30m should be shorter than refresh 30m. Current values: refresh 30m, retry 30m, expire 7d, negative TTL 1h.

#23
✓ Primary is a public nameserver #24

The primary nameserver ns01.a1.nl is one of the listed nameservers.
✓ Contact noc@a1.nl #25

The SOA RNAME noc.a1.nl means noc@a1.nl.
✓ Date-based serial #26

The serial 2026102201 follows the YYYYMMDDnn convention (2026-10-22).

warn

Not signed

warn

7 records at the apex

Type	Value	TTL
SOA	ns01.a1.nl. noc.a1.nl. 2026102201 1800 1800 604800 3600	600
NS	ns02.a1.nl.	3600
NS	ns03.a1.nl.	3600
NS	ns01.a1.nl.	3600
A	62.221.214.93	60
MX	0 oor-nl.mail.protection.outlook.com.	600
TXT	"v=spf1 include:spf.protection.outlook.com ip4:213.52.129.59/32 ip4:62.221.214.93"	600