AS21947 Blackfoot Telephone Cooperative, Inc.

BCI - Blackfoot Telephone Cooperative, Inc. · registered in the United States

IPv4 addresses70,14429 prefixes · 0.002% of announced IPv4

Rank in United States#788largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,426of 79,396 networks with IPv4

IPv62 x /32 (196,352 x /48)10 prefixes

CountryUnited States18,679 ASNs registered there

Open AS21947 in ASN lookup Look up an IP in this network (64.25.128.1) All networks in United States

IPv4 prefixes

All 29 prefixes, in address order.

64.25.128.0/23
64.25.131.0/24
64.25.132.0/22
64.25.136.0/21
66.109.128.0/20
66.109.144.0/22
66.109.148.0/23
66.109.151.0/24
66.109.152.0/21
69.51.64.0/22
69.51.68.0/23
69.51.72.0/21
69.51.80.0/20
69.51.96.0/19
69.165.112.0/20
192.150.152.0/21
192.225.176.0/20
198.60.195.0/24
199.195.120.0/21
204.11.244.0/22
205.167.162.0/23
209.137.225.0/24
209.137.226.0/23
209.137.228.0/22
209.137.232.0/21
209.137.240.0/20
209.200.192.0/19
216.14.224.0/19
216.47.48.0/20

IPv6 prefixes

All 10 prefixes.

2001:1940::/36
2001:1940:1000::/37
2001:1940:1900::/40
2001:1940:1a00::/39
2001:1940:1c00::/38
2001:1940:2000::/35
2001:1940:4000::/34
2001:1940:8000::/33
2604:300::/32
2607:f8e0::/32

Other ASNs named Blackfoot Telephone Cooperative, Inc.

1 other network uses the same organisation name; together with AS21947 they announce 70,656 IPv4 addresses.

ASNNameIPv4 addresses

AS15331BCI-LAB - Blackfoot Telephone Cooperative, Inc. US512

Similar-sized networks in United States

ASNNameIPv4 addresses

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AS13433#786 COXNET - Cox Enterprises Inc70,400

AS17153#787 NMT-AS - New Mexico Tech70,400

AS4195#789 SHAW - D. E. Shaw & Co. LP70,144

AS27370#790 CITYOFBOSTON - City of Boston70,144

AS62618#791 MICHIGANTECH - Michigan Technological University70,144

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