AS209499 GSI GSI Helmholtzzentrum fur Schwerionenforschung GmbH

GSI GSI Helmholtzzentrum fur Schwerionenforschung GmbH · registered in Germany

IPv4 addresses65,5361 prefixes · 0.002% of announced IPv4

Rank in Germany#113largest network in DE by IPv4 space, of 2,315 · 0.06% of DE

Rank worldwide#3,421of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryGermany2,599 ASNs registered there

Open AS209499 in ASN lookup Look up an IP in this network (140.181.0.1) All networks in Germany

IPv4 prefixes

All 1 prefix, in address order.

140.181.0.0/16

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ASNNameIPv4 addresses

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AS199610#114 MARBIS marbis GmbH65,280

AS8303#115 WDR-AS Westdeutscher Rundfunk Koln64,768

AS24635#116 Syntax_Systems-AS Syntax Service GmbH64,512

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