Abstract: Technologies are provided for managing routing updates for Internet Protocol (IP) addresses based on network traffic utilization. For example, a set of IP addresses can be obtained (e.g., IP addresses that are assigned to hosts). Network traffic utilization data can be obtained for the set of IP addresses. Using the network traffic utilization data, a subset of set of IP addresses can be identified reflecting which of the IP addresses are being utilized (e.g., that have network traffic utilization over a threshold amount for a previous time period). The utilized IP addresses can be included in a routing update, which can be provided to one or more routers. For example, the routing update can add routes for IP addresses that are being utilized. The routing update can also withdraw routes for IP addresses that are not being utilized.