IP addresses on the Internet are represented by four sets of decimal numbers. What is the range of each set of numbers?
The range is 0 to 255.
The IP address is a 32-bit binary number, which is usually divided into 4 "8-bit binary numbers" (that is, 4 bytes). IP addresses are usually expressed in dotted decimal notation (a.b.c.d).
Among them, a, b, c, and d are all decimal integers between 0 and 255. Example: The dotted decimal IP address (100.4.5.6) is actually a 32-bit binary number (01100100.00000100.00000101.00000110).
IPV4 has 4 segments of numbers, each segment cannot exceed 255. Due to the booming development of the Internet, the demand for IP addresses is increasing, making the issuance of IP addresses more stringent. Various data show that all global IPv4 addresses may be issued between 2005 and 2010 (the actual situation is that in 2011 The allocation of IPv4 addresses was completed on February 3, 2016).
Extended information:
Every host (Host) on the Internet has a unique IP address. The IP protocol uses this address to transfer information between hosts, which is the basis for the Internet to run.
The length of the IP address is 32 bits (a total of 2^32 IP addresses), divided into 4 segments, each segment is 8 bits, represented by decimal numbers, each segment number ranges from 0 to 255, segment and segment Separate them with periods.
IP addresses are divided into 5 categories: A, B, C, D, and E. The applicable types are: large network; medium network; small network; multi-purpose address; backup. The two most commonly used ones are B and C.
Allocation of IP address
TCP/IP protocol requires different settings for different networks, and each node generally requires an "IP address", a "subnet mask", A "default gateway". However, you can use Dynamic Host Configuration Protocol (DHCP) to automatically assign an IP address to the client, avoiding errors and simplifying the settings of the TCP/IP protocol.
IP addresses on the Internet are uniformly managed by an organization called "ICANN" (Internet Corporation for Assigned Names and Numbers, Internet Corporation for Assigned Names and Numbers).
IP addresses are currently assigned by the Internet Corporation for Assigned Names and Numbers (ICANN).
The above is the detailed content of IP addresses on the Internet are represented by four groups of decimal numbers. What is the range of each group of numbers?. For more information, please follow other related articles on the PHP Chinese website!