What does the slash mean in an IP address?

Question

What does the slash mean in an IP address?

In: 53

Answer 1

Its a shorthand way of writing the subnet mask.

/24 is the same as 255.255.255.0, or when expressed in binary, 11111111.11111111. 11111111.00000000, which is 24 binary 1
Ones in a row, hence /24