URL symbol characters (tough finding a good title - sorry)

Ok, I'm assuming this is the right section to post this, hopefully someone will be able to help me out.

When a URL contains spaces, it is usually represented as %20 (as far as I can tell)
I'm trying to dig out some information from a load of URLs and all the %20 and others are really making it difficult to see the useful information.

Is there a list (or alternatively, can anyone tell me) that shows what the different codes really represent (%3A %AE and so on)

Apologies if the language I've used is a bit confusing here - I'm not sure what the correct terms for these things are.

Thanks.

BS

 

There is a URL encoding utility that you can use to convert characters into their encoded equivalents.

There is also a comprehensive list at this link

 

Thanks a mill.
The second link is pretty good - for some reason the first doesn't want to work though.