A local network is a computer network that allows multiple computers (offices, apartments, houses, districts) to connect to the Internet through a single access point. Common access point can be modems, routers, switches, network adapters.
 With this program you can see which addresses you use, mask, mac, which local subnet you are in, local user name, etc.
Internet Protocol (ip) is the routed protocol of the network layer of the TCP / IP stack. It was IP that became the protocol that united individual computer networks into the world wide Internet. An integral part of the protocol is network addressing.
Subnet Mask — A bitmask for determining by IP address the subnet address and node address

There is an advertisement