classful adjective 2noun 1forms 2 adjective2 •(Internet) Of or relating to a network-addressing architecture that divides the address space into a number of classes.Classful routing protocols do not carry subnet masks; classless routing protocols do. — 2002 •Of or relating to the presence and employment of classes in a programming language. noun1 •An amount that fills a class.They were real aids to memory, and amused whole classesful at a time. — 1922 formsclassesful · classfuls
