AS9007 — DUF-AS Winsbergring 38

AS9007 announces 5 IPv4 prefixes covering 5,888 addresses and 1 IPv6 prefixes.

About this network

DUF-AS is Dumrath & Fassnacht KG (GmbH & Co.), a Hamburg publishing house (Winsbergring 38, Bahrenfeld) best known for North German telephone and business directories, Das Telefonbuch, Gelbe Seiten and Das Örtliche.

What it's used for

A single-organisation enterprise network. It announces 192.166.160.0/19 (and a covering /20), ~8k addresses, with just one observed neighbour, the footprint of a company routing its own legacy block behind a single upstream rather than a service provider.

Notable

No PTRs were returned on the addresses sampled. The publisher runs internet operations under the duf.de domain; the /19 and 2000 first-seen date reflect an early, generously sized allocation held by a media company.

Interesting

The AS/KG (GmbH & Co.) in the name is a German company form, not an autonomous-system reference, and the firm is a directory publisher, so despite the size of the block this is an ordinary enterprise rather than a hosting or access network.

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

Announced prefixes

• 192.166.160.0/22
• 192.166.164.0/23
• 192.166.166.0/24
• 192.166.168.0/21
• 192.166.184.0/21
• 2a04:7680::/29

Upstream networks

• AS9211 Nawork Internet Informationssysteme GmbH

Adjacent networks

• AS9211 Nawork Internet Informationssysteme GmbH