This calculator requires the use of Javascript enabled and capable browsers. The following utility calculates the network and broadcast addresses that a given IP address is associated with. The calculations are based on RFC 1219 compliant addresses. A maximum of three decimal characters (0-9) per box with a decimal value of between 0 (zero) and 255 is required. If the value is 0, please put in a 0. The network prefix length is assumed in hex; a maximum of 2 hex characters are allowed.