AS18862 Omnicare, Inc.

NCS-HEALTHCARE - Omnicare, Inc. · registered in the United States

IPv4 addresses38,65631 prefixes · 0.001% of announced IPv4

Rank in United States#1,605largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#4,391of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS18862 in ASN lookup Look up an IP in this network (12.15.144.1) All networks in United States

IPv4 prefixes

All 31 prefixes, in address order.

12.15.144.0/24
74.116.80.0/22
152.145.168.0/24
152.145.172.0/24
152.145.176.0/22
152.145.182.0/24
152.145.223.0/24
152.145.224.0/24
152.145.240.0/23
156.78.128.0/22
192.160.146.0/24
204.14.128.0/23
204.99.0.0/21
204.99.8.0/22
204.99.12.0/23
204.99.14.0/23
204.99.16.0/21
204.99.24.0/21
204.99.32.0/20
204.99.48.0/23
204.99.50.0/24
204.99.51.0/24
204.99.52.0/22
204.99.56.0/21
204.99.64.0/19
204.99.96.0/20
204.99.112.0/22
204.99.116.0/23
204.99.118.0/24
204.99.119.0/24
204.99.120.0/21

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AS30569#1606 CREIGHTON-AS - Creighton University38,656

AS16700#1607 CNSNEXT - CNSNext38,400

AS18615#1608 MAINSTREAM-FIBER - Mainstream Fiber Networks, LLC38,400

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