Create Unique ID Plugin for Visitors for HTML Website

Greetings, I got a Website and I have Set Up an IP BAN System. So, anybody who is banned will be Redirected to the BAN APPEAL Page. So, Me, being an Owner won't remember who EXACTLY that was just from his IP Address. So, I need a Sort of System, that stays at the TOP of Every Page and Will show a very Unique ALPHA Coded Number, For Example : Hello there, Your Unique ID is : 1hu8-97ym-6y7c-8zxr It Must never disappear Whether the Visitor CHANGES or RELOADS the Page, It must NOT change as well. I got no Photos or anything like that as I haven't seen this on any websites yet. But I know you understood it! PS, It has to be having an Unlimited Amount of codes coz You never know when you run out, lol. I need it to remember the IP of the Visitor and then, Show the Code until it detects that IP is still in my servers. PS, I do NOT have any LogIn or SignUp / Online Store in my Website. It's just a Simple Website and You need to code this simple thing. Your Work : Starting the Project -> Coding and Preparing -> You've completed -> EXECUTE It in the Website -> Test it Out -> After I approve, You would receive a Thank You message. So, Who's Interested Pros?