IP or Internet Protocol is nothing but number’s that will be assigned to any devices which are connected to Internet mainly used for communication.
4 types of IP.
Pubic - External facing IP (Routers)
Private - Internal facing IP (TV, Mobile, IoT, washing machine, etc)
Static - Manually assigning IP
Dynamic - Automatic assigning IP
5 Classes of IP
A - 1.0.0.0 to 126.255.255.255
B - 128.0.0.0 to 191.255.255.255
C - 192.0.0.0 to 223.255.255.255
D - 224.0.0.0 to 239.255.255.255 (For Multicasting or Broadcasting)
E - 240.0.0.0 to 254.255.255.255 (For Experimental)
127.0.0.1 is the Loopback IP address.