AS18731 Cityside Fiber

CITYSIDE-01 - Cityside Fiber · registered in the United States

IPv4 addresses4,8644 prefixes · <0.001% of announced IPv4

Rank in United States#4,164largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#13,883of 79,396 networks with IPv4

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

CountryUnited States18,679 ASNs registered there

Open AS18731 in ASN lookup Look up an IP in this network (23.164.40.1) All networks in United States

IPv4 prefixes

All 4 prefixes, in address order.

23.164.40.0/24
128.177.138.0/24
154.50.58.0/24
157.238.80.0/20

IPv6 prefixes

All 1 prefix.

2607:73c0::/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