Same as ASCII (but with leading 0s :)
A-Z = U+0041 - U+005A = 65-90 decimal
a-z = U+0061 - U+007A = 97-122 decimal
Answer from Jon Skeet on Stack OverflowThe complete Unicode chart of all characters can be found at the Unicode website: http://www.unicode.org/ucd/
Information about HTML character references can be found at the W3C: http://www.w3.org/International/questions/qa-escapes
The official list of named character entities for HTML5 is here: http://www.w3.org/TR/html5/syntax.html#named-character-references
Anything not found in that list will have to be represented by a numeric character reference, which is derived from the character's Unicode code point (i.e. you don't need a table for that).
I assume, you use windows (your avatar, huh?).
Do you tried charmap.exe? Just WIN + R to open "Run..." and enter charmap.
Make sure, you have choosen the right font, you want to use.