AS396151 Steward Health Care System LLC

STEWARDHEALTHCARE - Steward Health Care System LLC · registered in the United States

IPv4 addresses4,8647 prefixes · <0.001% of announced IPv4

Rank in United States#4,237largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#14,120of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS396151 in ASN lookup Look up an IP in this network (198.89.64.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

198.89.64.0/21
198.89.72.0/22
198.89.77.0/24
198.89.78.0/23
198.89.83.0/24
198.212.151.0/24
204.58.2.0/23

Similar-sized networks in United States

ASNNameIPv4 addresses

AS394869#4234 APNC - Asia Pacific Network Corporation4,864

AS395032#4235 KRAUS-ONLINE - Krausonline.com4,864

AS395434#4236 46LABS-DAL1 - 46 Labs LLC4,864

AS396185#4238 PEMTEL - GILES-CRAIG COMMUNICATIONS INC.4,864

AS397635#4239 PATHLINE-CAMPUS - Synopsys Inc.4,864

AS399313#4240 LOWELL-INT - TUFTS ASSOCIATED HEALTH PLANS, INC.4,864

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