As the network address and the domain name IP meaning
on the Internet (Internet) with millions of hosts (host), in order to distinguish between these hosts, people give each host is assigned a special "address" as a mark, known as the IP address, it is like your online identity card, to check your IP address in Windows the system of 9x ", click the "start"; "to run" winipcfg "type (2000/xp type ipconfig) and press enter. IP is the abbreviation of Internet Protocol (Internet Protocol). Information transfer between the host must be aware of each other’s IP address. The length of each IP address is 32 bits (bit), divided into 4 segments, each segment of the 8 (1 bytes), commonly used decimal numbers, each segment of the digital range of 1 ~ 254, segment and segment with the decimal point. Each byte (segment) can also be expressed in sixteen or binary. Each IP address consists of two ID (identification code), namely the network ID and host ID. All hosts on the same physical network use the same network ID, a host on the network (workstations, servers, routers, etc.) corresponds to a host ID. In this way, the 4 bytes of the IP address are divided into 2 parts, one part is used to indicate the specific network segment, that is, the network ID; the other is used to indicate the specific node, that is, the host ID. This 32 bit address is divided into five categories corresponding to a class, B class, C class, D class and E class IP address.1 a
a class IP address by 1 bytes (each byte is 8 bits) of the network address and host address 3 bytes, the highest network address must be "0", namely the digital range of the first section is 1 to 127. Each class a address can be connected to 16387064 hosts, Internet has 126 class a address.
a class B IP address by 2 bytes 2 bytes of the network address and the host address, the highest network address must be "10", namely the digital range of the first section is 128 to 191. Each B class >