The blocked listed IP addresses can not submit your form. Suppose you have noticed that from specific IP addresses a form is being submitted as spamming and you do not like it. In this case, you can use this feature, you can list those IP here and form submission from those IP will not be accepted anymore.And you can also disable the blocked listed IPs whenever you want.
For example, you want to disallow submission from the below listed IPs
103.145.119.253
103.145.119.251
103.145.119.250
Just put these three IPs on blocked list and enable blocked option. Now, no more submission will be accepted from those IPs

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