Systems and methods for dynamic IP address whitelisting are disclosed. These techniques allow for better management of IP addresses and improve computer system and network security. In one embodiment, a system may execute a first task, at a first frequency, that includes determining, based on registered account activities corresponding to registered accounts with a service provider, at least one IP address associated with at least one registered account with the service provider. The first task may further include adding the at least one IP address to a dynamic whitelist (e.g., allowlist) of IP addresses. The system may execute a second task, at a second frequency, that includes removing, from the dynamic whitelist, at least one existing IP address identified as inactive. Thus, in various embodiments, inactive IP addresses can be removed from a whitelist while active IP addresses are periodically re-verified.