AS20166 1st Financial Bank USA

1FBUSA-1 - 1st Financial Bank USA · registered in the United States

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in United States#14,379largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#64,106of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS20166 in ASN lookup Look up an IP in this network (8.39.15.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

8.39.15.0/24

Other ASNs named 1st Financial Bank USA

1 other network uses the same organisation name; together with AS20166 they announce 512 IPv4 addresses.

ASNNameIPv4 addresses

AS3983311FBUSA-PROD - 1st Financial Bank USA US256

Similar-sized networks in United States

ASNNameIPv4 addresses

AS20133#14376 CASS-COL - CASS INFORMATION SYSTEMS256

AS20138#14377 CTHS-ASN-20138 - Carson Tahoe Health System256

AS20159#14378 IMPERIAL-CAPITAL-GROUP-LLC - Imperial Capital Group LLC256

AS20168#14380 AM-US-AMER-PRECOR-PRECO-11 - Precor Incorporated256

AS20190#14381 AS20190 - 1-800-Flowers.com, Inc.256

AS20208#14382 8DWEB-01 - 8DWeb LLC256

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