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AS16503
AS16503 Zayo Bandwidth
ZAYO-16503 - Zayo Bandwidth · registered in the United States
IPv4 addresses 20,224 11 prefixes · <0.001% of announced IPv4
Rank in United States #2,127 largest network in US by IPv4 space, of 18,338 · <0.01% of US
Rank worldwide #6,128 of 79,396 networks with IPv4
IPv6 none no IPv6 routes announced
IPv4 prefixes
All 11 prefixes, in address order.
64.20.96.0/21 64.20.104.0/23 64.20.107.0/24 64.20.108.0/22 64.20.112.0/21 64.20.121.0/24 64.20.122.0/23 64.20.124.0/22 64.124.127.0/24 66.45.192.0/19 216.178.48.0/20
Other ASNs named Zayo Bandwidth
13 other networks use the same organisation name; together with AS16503 they announce 2,533,120 IPv4 addresses.
ASN Name IPv4 addresses
AS6461 ZAYO-6461 - Zayo Bandwidth US 1,596,672 AS11686 ZAYO-ENA-11686 - Zayo Bandwidth US 734,720 AS19092 360NETWORKS-US - Zayo Bandwidth US 69,376 AS32703 IFN-NET - Zayo Bandwidth US 34,560 AS4997 AFS-WEST - Zayo Bandwidth US 22,784 AS15290 ZAYO-CAN-15290 - Zayo Bandwidth US 20,736 AS17025 ZAYO-CUSTOMER-17025 - Zayo Bandwidth US 14,848 AS13555 EAGLE-NET-ALLIANCE - Zayo Bandwidth US 8,704 AS33321 ZAYO-33321 - Zayo Bandwidth US 3,840 AS22969 AFS-ATL - Zayo Bandwidth US 2,816 AS11359 RMCNEVADA - Zayo Bandwidth US 2,304 AS6401 ZAYO-CAN-6401 - Zayo Bandwidth US 1,280 AS19158 ZAYOB-19158 - Zayo Bandwidth US 256
Similar-sized networks in United States
ASN Name IPv4 addresses
AS17293 #2124 VTXC - VTX Communications LLC20,224 AS394437 #2125 PSLIGHTWAVE - PS Lightwave20,224 AS398704 #2126 STACKSINC-BACKBONE - STACKS INC20,224 AS22647 #2128 CONSOLIDATED FLORIDA - Fidium20,224 AS36295 #2129 FLORIDA-HIGH-SPEED-INTERNET - Florida High Speed Internet19,968 AS393713 #2130 ALL-POINTS-BROADBAND-5 - All Points Broadband19,968
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