IP addresses

Each server or client on a TCP/IP internet is identified by a numeric IP address. IP stands for Internet Protocol.

The standard type of IP address, the IPv4 (IP version 4) address, is 32 bits. For the convenience of the human reader, it is usually expressed in dotted decimal notation:
IP address in hexadecimal notation :   '817EB263'x
Byte 0:  81 hexadecimal = 129 decimal
Byte 1:  7E hexadecimal = 126 decimal
Byte 2:  B2 hexadecimal = 178 decimal
Byte 3:  63 hexadecimal =  99 decimal
IP address in dotted decimal notation: 129.126.178.99

A newer type of IP address, the IPv6 (IP version 6) address, is 128 bits. It is usually expressed in hexadecimal notation, and not in dotted decimal notation. (CICS® Web support does not support IPv6 addresses.)

IP addresses are managed and allocated to users by the Internet Assigned Numbers Authority (IANA) and its delegates.