Please help me to write irule according to ip-address

That is not enough information to assist you with what you are needing.

 

 

There are command differences between v9.x.x and v10.x.x, so the platform version matters.

 

 

It also matters how many IP Addresses you need to be blocking to determine the most efficient way to implement the iRule and Manage it. 1, 2, 10, entire /24 subnet?

 

 

Your current setup of the Virtual Servers and Pools may also have some bearing on the suggestions that you may get (if you have 4 servers and want users to be directed to them by some type of priority you may want to put them in separate pools (could be 2 pools or even 3 depending on what you want)).