Arpa.mesa
Copyright Ó 1986 by Xerox Corporation. All rights reserved.
Hal Murray, April 5, 1986 4:22:42 pm PST
Doug Wyatt, December 11, 1986 11:52:44 am PST
Arpa IP (Internet Protocol) Addresses are a combination of net and host numbers. There are 3 cases.
If the first bit is a 0, the next 7 are a type A net number, and the remaining 24 are the host number within that net.
If the first two bits are 10, the next 14 are a type B net number, and the remaining 16 are the host number within that net.
If the first two bits are 11, the next 22 are a type C net number, and the remaining 8 are the host number within that net.
Arpa: CEDAR DEFINITIONS
= BEGIN
Addressing
Address: TYPE = RECORD [a, b, c, d: BYTE];
nullAddress: Address = [0, 0, 0, 0];
Net: TYPE = {a, b, c};
netMasks:
ARRAY Net
OF Address = [
a: [0FF, 0, 0, 0],
b: [0FF, 0FFH, 0, 0],
c: [0FF, 0FFH, 0FFH, 0]
];
NetType: PROC [address: Address] RETURNS [Net];
NetNumber:
PROC [address: Address]
RETURNS [Address];
END.