AS12581 — TOPSNET

AS12581 announces 4 IPv4 prefixes covering 9,728 addresses and 2 IPv6 prefixes.

About this network

A regional provider carrying the city of Bonn's address space, registered through two different companies.

What it's used for

• Internet access and municipal connectivity. 9,728 addresses in four IPv4 prefixes, two IPv6 prefixes, and two observed BGP neighbours.

Notable

• 212.79.160.0/19 is netname DE-TOPS-NET-990728; 185.27.252.0/22 is DE-TOPS-NET-20130605.
• Two further blocks are STADT-BONN-1 and STADT-BONN-2. The first is registered through bnt Blatzheim Networks Telecom GmbH with Stadt Bonn as the holder; the second through Datenwelt IT Service AG.
• A contact role on three of the blocks is named tops.net DNS Guardian.
• The IPv6 announcements are 2001:67c:434::/48 and 2a00:c940::/32.
• One sampled address answers 254.183.rhein-sieg-breitband.tops.net.

Interesting

• A city's two /24s, numbered in sequence, reached the routing table through three separate commercial entities: one registrar of record each, and this AS announcing both. Municipal networks rarely run their own routing, so the paperwork trail is longer than the network.
• rhein-sieg-breitband names the district that wraps around Bonn and the German word for broadband. A publicly funded rural build and a city government's addresses turn up in the same small inventory, which is what a provider that wins regional contracts looks like from the outside.
• The two IPv6 blocks come from different systems: a /48 out of the registry's own assignment space and a /32 out of ordinary allocation space. Holding both means the network was given addresses twice under two different rulebooks.

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

Announced prefixes

• 91.213.177.0/24
• 185.27.252.0/22
• 193.138.88.0/24
• 212.79.160.0/19
• 2001:67c:434::/48
• 2a00:c940::/32

Upstream networks

• AS8422 NetCologne Gesellschaft fur Telekommunikation mbH
• AS3257 GTT Communications Inc.

Adjacent networks

• AS8422 NetCologne Gesellschaft fur Telekommunikation mbH
• AS3257 GTT Communications Inc.