asn.dev

Autonomous system

AS59845 TOP21SH-AS

Unclassified RIPE

IPv4 addresses 512 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly DE
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Top 21 Systemhaus

Germany · AI-generated

business it-services stuttgart

TOP21SH-AS is operated by Top 21 Systemhaus GmbH.

What it's used for

  • The address space is registered under the netname DE-TOP21SH-20130612 for Top 21 Systemhaus GmbH.
  • The AS announces 512 IPv4 addresses in a single /23 prefix and 1 IPv6 prefix, with only 1 observed neighbour.
  • As an IT service provider for small to medium-sized businesses, the traffic consists of corporate office workers and internal IT endpoints.

Notable

  • The RDAP registrant matches the AS holder, Top 21 Systemhaus GmbH.
  • The address inventory is compact, consisting of a single contiguous IPv4 block and one IPv6 prefix.

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

Full topology · Graph

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.

ASNetworkPaths seen
AS88811&1 Versatel GmbH188

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 512 addresses IPv6 1 prefixes

CountryNamePrefixes
DEGermany2

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS59845
Registry name
TOP21SH-AS
Registrant
Top 21 Systemhaus GmbH
Abuse contact
abuse@top21.sh
Registered
2014-09-05
Last changed
2018-09-04
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 4 with no ROA
ROAs
0 authorising AS59845
ASPA
no ASPA record
IRR
100% registered · 4 of 4 announcements
Route objects
4 naming AS59845

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 1,783 prefixes, as published 2026-10-17. 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

Cross-check