Cabletron Systems EMM-E6 Ethernet - Manual (Page 36)

CHAPTER 1: INTRODUCTION
1-24 EMM-E6 User’s Guide
Table 1-2. Class A
Table 1-3. Class B
Table 1-4. Class C
Range of Network IDs: 1 - 126. host. host. host
[1 octet for the Network ID
(127 reserved)]
Binary translation:
(of first octet) 0000001 - 01111111
[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]
Range of Network IDs: 128 - 191. 1 - 254. host. host
[2 octets for the Network ID]
Binary translation:
(of first octet) 1000000 - 10111111
[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]
Range of Network IDs: 192 - 223. 1 - 254. 1 - 254. host
[3 octets for the Network ID]
Binary translation:
(of first octet) 1100000 - 11011111
[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]
CH1Book Page 24 Wednesday, March 20, 1996 7:48 AM