This is a simple converter script written in Javascript that takes a unicode character as input (don't worry about the how - if your browser is set to UTF-8, which it should be because it picked it up automatically from this webpage's encoding instruction, it works), and then returns the hexadecimal value for that character's position in the unicode planes.
If you don't know what that means, don't worry, it's probably not relevant to your interests. If you do know what that means, and you've been looking all over the fricking place for a simple converter webpage: I feel your pain. That's why I made this one. You'd think the internet would be full of them; turns out, not.
Useful links with regards to this script:
This converter was written by Mike "Pomax" Kamermans, of nihongoresources.com
Should you want, you can technically just save this page to your harddisk, and it will still work - it does not rely on server side magic.