asn.dev

Autonomous system

AS21405 TSS1

Unclassified RIPE

IPv4 addresses 2.05K 3 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly CH
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

T-Systems Schweiz AG

Switzerland · AI-generated

business enterprise switzerland

The AS handle TSS1 is operated by T-Systems Schweiz AG.

What it's used for

  • The address space is registered under netnames CH-TSS-20160523, T-Systems-Schweiz-AG, and ADDS, all attributed to T-Systems Schweiz AG.
  • The AS announces 2048 IPv4 addresses across 3 prefixes and 1 IPv6 prefix, with only 1 observed neighbour, indicating a small, self-contained corporate network rather than a transit or access provider.

Notable

  • All RDAP registrants for the announced prefixes are T-Systems Schweiz AG, consistent with the AS holder.
  • The address inventory consists of three distinct IPv4 blocks (185.153.104.0/22, 138.124.232.0/23, 193.108.232.0/23) and one IPv6 prefix (2a07:8700::/29), reflecting a segmented internal estate.

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
AS6730Sunrise GmbH213

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

Shape and geography

IPv4 3 prefixes · 2.05K addresses IPv6 1 prefixes

CountryNamePrefixes
CHSwitzerland4

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS21405
Registry name
TSS1
Registrant
AS21405-MNT
Abuse contact
FMB.TS-CHE-CSNET@t-systems.com
Registered
2001-11-29
Last changed
2023-02-20
Allocation
allocated

Declared

PeeringDB profile

self-reported
Name
T-Systems Schweiz AG
Scope
Not Disclosed
Traffic ratio
Not Disclosed
Peering policy
Open

PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 4 with no ROA
ROAs
0 authorising AS21405
ASPA
no ASPA record
IRR
100% registered · 4 of 4 announcements
Route objects
5 naming AS21405

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

Cross-check