IP.Subnet.bitlength

You're seeing just the function bitlength, go back to IP.Subnet module for more information.

Specs

bitlength(t(IP.v4())) :: 0..32
bitlength(t(IP.v6())) :: 0..128

retrieves the bitlength from a subnet.

iex> import IP
iex> IP.Subnet.bitlength(~i"10.0.0.0/24")
24