AS19043 OneBeacon Insurance Group LTD

ONEBEACONINSURANCEGROUP - OneBeacon Insurance Group LTD · registered in the United States

IPv4 addresses8,1929 prefixes · <0.001% of announced IPv4

Rank in United States#3,363largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#10,629of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS19043 in ASN lookup Look up an IP in this network (205.134.128.1) All networks in United States

IPv4 prefixes

All 9 prefixes, in address order.

205.134.128.0/22
205.134.132.0/23
205.134.134.0/23
205.134.136.0/21
205.134.144.0/21
205.134.152.0/22
205.134.156.0/23
205.134.158.0/24
205.134.159.0/24

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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