Have you ever under stand the number 127.0.0.1 the lo or the localloop back address see this on your browser http://0/ or just type 0 you will be seeing your local host
and one more thing every ip address is a big decimal number whcih one can type on the browser to view the page
such as ipaddress 127.0.0.1 setp 1 convet to hex (127)D -> (7F)H (0)D -> (0)H (0)D -> (0)H (1)D ->(1)H
step 2 put them back now the hex number is 7F 00 00 01 step 3 convert back to dec (7F000001)H= 2130706433
this your ip address
so 127.0.0.1 ==2130706433
enjoy numering sachin