AS40510 Southern Fiber Worx

SFWL - Southern Fiber Worx · registered in the United States

IPv4 addresses4,3527 prefixes · <0.001% of announced IPv4

Rank in United States#4,455largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#14,794of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS40510 in ASN lookup Look up an IP in this network (38.66.221.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

38.66.221.0/24
38.66.233.0/24
38.66.248.0/24
38.66.252.0/23
104.250.244.0/22
131.143.0.0/22
170.39.120.0/22

Similar-sized networks in United States

ASNNameIPv4 addresses

AS33178#4452 CSINET - Cable Services, Inc.4,352

AS35988#4453 UMASS-MEMORIAL-HEALTH-CARE - Umass Memorial health care inc4,352

AS36032#4454 WBD-AS36032 - WARNER BROS ENTERTAINMENT INC4,352

AS40801#4456 LEWISU-ROMEOVILLE - Lewis University4,352

AS40844#4457 WINN-DIXIE - Winn-Dixie Stores, Inc.4,352

AS40910#4458 BAYLOR - Baylor Health Care System4,352

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