How to find the character code in an icon font?

Question

css

Good afternoon. When connecting custom fonts, for example with icons, in css there is, as a rule, such a construction,
.entypo-social.github:before{ content:'\F300'; }
it is clear that the character code is enclosed in content, but how do you know which code corresponds to the desired character?

Answer 1

I usually use windows character table https://yadi.sk/i/4d-I5vmqjLMPp

Answer 2

Look in a file with a custom font?