Once the automatic IP blocking system detects that the Adwords 500 IP cap has been reached, it will begin to remove old, potentially no longer harmful IPs that were previously blocked from the block list and replace them with new, current and threatening new IPs.
This way we keep your exclusion lists alive and up to date against current threats at all times.
Just to clarify, It is important to understand that a specific IP that was used for fraudulent activity 2 months ago will not necessarily be used for the same activity nowadays.

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