AS513 European Organization for Nuclear Research

CERN CERN - European Organization for Nuclear Research · registered in Switzerland

IPv4 addresses354,81619 prefixes · 0.011% of announced IPv4

Rank in Switzerland#6largest network in CH by IPv4 space, of 741 · 2.40% of CH

Rank worldwide#708of 79,396 networks with IPv4

IPv62 x /32 (131,072 x /48)1 prefixes

CountrySwitzerland783 ASNs registered there

Open AS513 in ASN lookup Look up an IP in this network (128.141.0.1) All networks in Switzerland

IPv4 prefixes

All 19 prefixes, in address order.

128.141.0.0/16
128.142.0.0/16
137.138.0.0/16
185.249.56.0/22
188.184.0.0/15
192.16.155.0/24
192.16.156.0/22
192.16.160.0/22
192.16.164.0/23
192.16.166.0/24
192.65.183.0/24
192.65.184.0/21
192.65.192.0/22
192.65.196.0/23
192.91.236.0/22
192.91.240.0/22
192.91.244.0/23
192.91.246.0/24
194.12.128.0/18

IPv6 prefixes

All 1 prefix.

2001:1458::/31

Similar-sized networks in Switzerland

ASNNameIPv4 addresses

AS6730#3 SUNRISE Sunrise GmbH1,988,608

AS1836#4 GREEN green.ch AG491,008

AS2047#5 ASN-ROCHE-BASLE Hoffmann - La Roche Ltd.372,992

AS8803#7 MIGROS Migros-Genossenschafts-Bund330,240

AS15600#8 QUICKLINE Quickline AG319,488

AS12350#9 VTX-NETWORK VTX Services SA309,504

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