Autonomous System
AS209499 GSI Helmholtzzentrum fur Schwerionenforschung GmbH
BusinessActiveGermanyRIPE
AS209499 (GSI) is a business network operated by GSI Helmholtzzentrum fur Schwerionenforschung GmbH in Germany, registered with RIPE. It has 1 IPv4 prefix with 65,536 addresses, which makes it the 3,854th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses65,536in 1 prefix
IPv6 prefixes0none
Size rank#3,854of 82,200 active ASNs
Details
OrganizationGSI Helmholtzzentrum fur Schwerionenforschung GmbH
AS nameGSI
Websitegsi.de
Country Germany (DE)
Network typeBusiness
RegistryRIPE
Abuse contactabuse@gsi.de
Registered2025-04-28
Last updated2025-04-28
IPv4 prefixes
1 prefix · 65,536 addresses| Network | Addresses | First – last address |
|---|---|---|
| 140.181.0.0/16 | 65,536 | 140.181.0.0 – 140.181.255.255 |
140.181.0.0/16
IPv6 prefixes
No IPv6 prefixes.
Query AS209499 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS209499&key=YOUR_API_KEY"Any address in its prefixes resolves to AS209499, with or without a key:
curl "https://api.ipapi.is/?q=140.181.0.1"Largest networks in Germany
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