AS21405 TSS1 T-Systems Schweiz AG

TSS1 T-Systems Schweiz AG · registered in Switzerland

IPv4 addresses2,0483 prefixes · <0.001% of announced IPv4

Rank in Switzerland#223largest network in CH by IPv4 space, of 741 · 0.01% of CH

Rank worldwide#21,295of 79,396 networks with IPv4

IPv68 x /32 (524,288 x /48)1 prefixes

CountrySwitzerland783 ASNs registered there

Open AS21405 in ASN lookup Look up an IP in this network (138.124.232.1) All networks in Switzerland

IPv4 prefixes

All 3 prefixes, in address order.

138.124.232.0/23
185.153.104.0/22
193.108.232.0/23

IPv6 prefixes

All 1 prefix.

2a07:8700::/29

Similar-sized networks in Switzerland

ASNNameIPv4 addresses

AS59891#220 FSIT FSIT AG2,048

AS60804#221 SWISS-NETWORK Swiss Network SA2,048

AS60129#222 CSTI-NET CSTI SA2,048

AS39932#224 ERGON Ergon Informatik AG2,048

AS49865#225 JTI JT International SA2,048

AS203434#226 OPEN-CIRCLE Open Circle AG2,048

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources