AS51291 ISTOK-AS Istok Ltd.

ISTOK-AS Istok Ltd. · registered in Russia

IPv4 addresses1,0241 prefixes · <0.001% of announced IPv4

Rank in Russia#2,053largest network in RU by IPv4 space, of 4,937 · <0.01% of RU

Rank worldwide#37,907of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryRussia4,993 ASNs registered there

Open AS51291 in ASN lookup Look up an IP in this network (91.218.128.1) All networks in Russia

IPv4 prefixes

All 1 prefix, in address order.

91.218.128.0/22

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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