TCP/IP Configuration and Management Manual

NonStop TCP/IP Processes and Protocols
TCP/IP Configuration and Management Manual—427132-004
B-9
The Problem of Resolving Addresses
2. Divide the local addresses to accommodate the needs identified in Table B-1. Use
six bits of the first local address octet for network (subnets) addresses, two bits of
the first octet and all eight bits of the second octet for the host addresses.
Figure B-5 shows the class B IP address, with the local address occupying two
octets.
Figure B-6
shows the local address divided into six and eight bits.
Table B-1. Subnet Addressing Based on Current and Projected Needs
# Networks #Hosts
Required
Room for
Growth
Required
Bits for
Networks
Required
Bits for
Hosts
Omaha 1 100 1,000 hosts,
25 networks
610
Atlanta 1 17 100 hosts,
2 networks
17
Los
Angeles
1 30 100 hosts,
2 networks
17
Seattle 1 12 50 hosts,
2 networks
16
New York 1 30 100 hosts,
2 networks
17
Figure B-5. A Class B IP Address
024VST .VSD
Host
Address
00000011
3
10000000
128.
00001010
10.
10000010
130.
Class B
Address
Binary
Dottted
Decimal
Network Address Local Address