AS12574 — ROUTING Franzstr. 51, 52064 Aachen

Network type: hosting

AS12574 announces 4 IPv4 prefixes covering 7,680 addresses and 1 IPv6 prefixes.

About this network

A German host whose AS name is a street address, announcing a /19 with a /23-shaped hole in the middle of it.

What it's used for

• Web and server hosting. 7,680 addresses in five IPv4 prefixes, one IPv6 prefix, and one observed BGP neighbour.

Notable

• The AS handle is a postal address: ROUTING Franzstr. 51, 52064 Aachen.
• The five announcements are 213.160.64.0/21, 213.160.72.0/21, 213.160.80.0/21, 213.160.88.0/22 and 213.160.94.0/23.
• Four of the five share the netname DE-HOSTING-20000225; the registry record for the fifth could not be fetched.
• The IPv6 announcement is 2a00:17d8::/32.
• One sampled address answers 213.160.85.254.prohost.de.

Interesting

• Those five pieces span 213.160.64.0 to 213.160.95.255, which is exactly one /19 — with 213.160.92.0/23 left out. Five hundred and twelve addresses in the middle of the range are either used somewhere else, sublet to somebody who announces them separately, or simply not routed. A hole is one of the few things in BGP that is visible only by adding up what is around it.
• Putting a street address and postcode in the AS name field is a filing habit from an era when the registry entry was the phone book. It is still the only place in this record that says where the company is.
• The single reverse name belongs to prohost.de, not to hosting.de. Hosting companies accumulate brands, and the reverse zone is usually the last place the old one survives.

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

Announced prefixes

• 213.160.64.0/20
• 213.160.80.0/21
• 213.160.88.0/22
• 213.160.94.0/23
• 2a00:17d8::/32

Upstream networks

• AS48823 Hosting.de GmbH

Adjacent networks

• AS48823 Hosting.de GmbH