AS18615 Mainstream Fiber Networks, LLC

MAINSTREAM-FIBER - Mainstream Fiber Networks, LLC · registered in the United States

IPv4 addresses38,4008 prefixes · 0.001% of announced IPv4

Rank in United States#1,608largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#4,397of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryUnited States18,679 ASNs registered there

Open AS18615 in ASN lookup Look up an IP in this network (23.252.0.1) All networks in United States

IPv4 prefixes

All 8 prefixes, in address order.

23.252.0.0/20
38.2.0.0/19
38.194.0.0/18
74.116.20.0/22
147.160.8.0/21
149.20.248.0/21
163.182.176.0/20
206.126.242.0/23

IPv6 prefixes

All 1 prefix.

2607:1c80::/32

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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