Autonomous system
AS12581 TOPSNET tops.net GmbH & Co. KG
Unclassified RIPE
Summary
tops.net
isp government business
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
212.79.160.0/19is netnameDE-TOPS-NET-990728;185.27.252.0/22isDE-TOPS-NET-20130605.- Two further blocks are
STADT-BONN-1andSTADT-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::/48and2a00: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-breitbandnames 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
/48out of the registry's own assignment space and a/32out 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. 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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 9.73K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| DE | Germany | 6 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS12581- Registry name
- TOPSNET
- Registrant
- tops.net GmbH & Co. KG
- Abuse contact
- abuse@tops.net
- Registered
- 2002-03-26
- Last changed
- 2024-08-21
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 71% valid · 5 valid, 2 with no ROA
- ROAs
- 4 authorising AS12581
- ASPA
- no ASPA record
- IRR
- 100% registered · 7 of 7 announcements
- Route objects
- 14 naming AS12581
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: 447 networks and 1,843 prefixes, as published 2026-11-01. 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