AS11811 Oppenheimer & Co. Inc.

OPCO - Oppenheimer & Co. Inc. · registered in the United States

IPv4 addresses5122 prefixes · <0.001% of announced IPv4

Rank in United States#10,638largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#49,731of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS11811 in ASN lookup Look up an IP in this network (204.86.250.1) All networks in United States

IPv4 prefixes

All 2 prefixes, in address order.

204.86.250.0/24
209.127.49.0/24

Similar-sized networks in United States

ASNNameIPv4 addresses

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AS11789#10637 SURFAIRWIRELESS-IN-03 - Surf Air Wireless, LLC512

AS11865#10639 EPE-ASN-BGP-1 - El Paso Electric512

AS11883#10640 TGNA-KTHV - TEGNA Inc.512

AS11893#10641 LOLIGO-ASN - Loligo Cache Systems, Inc.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