Autonomous system
AS9007 DUF-AS Winsbergring 38
Unclassified RIPE
Summary
Dumrath & Fassnacht KG (GmbH & Co.)
enterprise legacy
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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS9211 | Nawork Internet Informationssysteme GmbH | 167 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-19, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 5.89K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| DE | Germany | 6 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS9007- Registry name
- DUF-AS
- Registrant
- DUF-MNT
- Abuse contact
- abuse@duf.de
- Registered
- 2002-08-27
- Last changed
- 2022-11-21
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 3 authorising AS9007
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 12 naming AS9007
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,778 prefixes, as published 2026-10-20. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere