AS397142 City of Fort Collins

FORT-COLLINS-CONNEXION - City of Fort Collins · registered in the United States

IPv4 addresses36,09613 prefixes · 0.001% of announced IPv4

Rank in United States#1,647largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#4,525of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)17 prefixes

CountryUnited States18,679 ASNs registered there

Open AS397142 in ASN lookup Look up an IP in this network (23.163.32.1) All networks in United States

IPv4 prefixes

All 13 prefixes, in address order.

23.163.32.0/24
38.15.32.0/19
38.75.232.0/21
38.80.148.0/22
38.147.232.0/21
38.175.160.0/19
38.246.0.0/19
167.94.176.0/20
192.251.149.0/24
198.99.80.0/22
204.107.184.0/24
204.133.79.0/24
204.133.83.0/24

IPv6 prefixes

All 17 prefixes.

2605:b40::/33
2605:b40:8000::/34
2605:b40:c000::/35
2605:b40:e000::/36
2605:b40:f000::/41
2605:b40:f080::/42
2605:b40:f0c0::/48
2605:b40:f0c1::/48
2605:b40:f0c2::/47
2605:b40:f0c4::/46
2605:b40:f0c8::/45
2605:b40:f0d0::/44
2605:b40:f0e0::/43
2605:b40:f100::/40
2605:b40:f200::/39
2605:b40:f400::/38
2605:b40:f800::/37

Other ASNs named City of Fort Collins

1 other network uses the same organisation name; together with AS397142 they announce 36,864 IPv4 addresses.

ASNNameIPv4 addresses

AS394748CITYOFFORTCOLLINS - City of Fort Collins US768

Similar-sized networks in United States

ASNNameIPv4 addresses

AS14371#1644 PBNET - Paul Bunyan Communications36,096

AS14374#1645 AGRI-VALLEY - Agri-Valley Services Corporation36,096

AS26223#1646 SILVERSTAR-TELEPHONE - Silver Star Communications36,096

AS30383#1648 GENERAL-MOTORS-CORPORATION - General Motors LLC36,096

AS13886#1649 CLOUD-SOUTH - Cloud South36,096

AS26464#1650 JOYENT-INC-US - Joyent, Inc.36,096

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