Cabletron Systems EMM-E6 Ethernet manual Class a

CHAPTER 1: INTRODUCTION

Table 1-2. Class A

Range of Network IDs:		1 - 126. host. host. host
		[1 octet for the Network ID
		(127 reserved)]
Binary translation:		0000001 - 01111111
(of first octet)		[first bit is always 0]
Range for the Host ID:		net. 1 - 254. 1 - 254. 1 - 254
		[3 octets for the Host ID - allows
		16,777,214 hosts per network]
	Table 1-3. Class B
Range of Network IDs:		128 - 191. 1 - 254. host. host
		[2 octets for the Network ID]
Binary translation:		1000000 - 10111111
(of first octet)		[first bit is always 1 and second
		is always 0]
Range for the Host ID:		net. net.1 - 254. 1 - 254
		[2 octets for the Host ID - allows
		65,534 hosts per network]
	Table 1-4. Class C
Range of Network IDs:			192 - 223. 1 - 254. 1 - 254. host
			[3 octets for the Network ID]
Binary translation:			1100000 - 11011111
(of first octet)			[first and second bits always 1
			and third is always 0]
Range for the Host ID:			net. net. net. 1 - 254
			[1 octet for the Host ID - allows
			254 hosts per network]

1-24 EMM-E6 User’s Guide