AS5491 — OLSSON_NET

AS5491 announces 1 IPv4 prefixes covering 256 addresses and 0 IPv6 prefixes.

About this network

OLSSONNET is a small independent network registered to Jan Olsson in Vallensbæk, Denmark. It announces a single IPv4 /24 alongside IPv6.

What it's used for

• The operator's own hosts and services. Reverse DNS on the /24 resolves to names like fw-1.olsson.net and phone.olsson.net, so the space is in direct use rather than being sub-assigned to customers.

Notable

• One of the smaller networks in the low-AS range: a single /24 of IPv4, run with real transit and peering. Registry remarks list transit from the Danish research and education network and from Cibicom, plus IPv6 transit from Swipnet and Nianet.
• The aut-num remarks carry a banner reading "AS5491 Internet since 1993" along with peering, routing, and NOC contact addresses - the presentation of a long-running, seriously operated network despite its size.

Interesting

• A reminder that an AS number says nothing about scale. AS5491 sits in the same numeric neighbourhood as national carriers and university networks while routing 256 addresses.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 193.163.221.0/24

Upstream networks

• AS1835 IDDQD-AS

Adjacent networks

• AS1835 IDDQD-AS