Appendix B IP Addresses and Subnetting

Example: Eight Subnets

Similarly, use a 27-bit mask to create eight subnets (000, 001, 010, 011, 100, 101, 110 and 111).

The following table shows IP address last octet values for each subnet.

Table 62

Eight Subnets

 

 

 

SUBNET

 

SUBNET

FIRST ADDRESS

LAST

BROADCAST

 

ADDRESS

ADDRESS

ADDRESS

1

 

0

1

30

31

 

 

 

 

 

 

2

 

32

33

62

63

 

 

 

 

 

 

3

 

64

65

94

95

 

 

 

 

 

 

4

 

96

97

126

127

 

 

 

 

 

 

5

 

128

129

158

159

 

 

 

 

 

 

6

 

160

161

190

191

 

 

 

 

 

 

7

 

192

193

222

223

 

 

 

 

 

 

8

 

224

225

254

255

 

 

 

 

 

 

Subnet Planning

The following table is a summary for subnet planning on a network with a 24-bit network number.

Table 63 24-bit Network Number Subnet Planning

NO. “BORROWED”

SUBNET MASK

NO. SUBNETS

NO. HOSTS PER

HOST BITS

 

 

SUBNET

1

255.255.255.128 (/25)

2

126

 

 

 

 

2

255.255.255.192 (/26)

4

62

 

 

 

 

3

255.255.255.224 (/27)

8

30

 

 

 

 

4

255.255.255.240 (/28)

16

14

 

 

 

 

5

255.255.255.248 (/29)

32

6

 

 

 

 

6

255.255.255.252 (/30)

64

2

 

 

 

 

7

255.255.255.254 (/31)

128

1

 

 

 

 

The following table is a summary for subnet planning on a network with a 16-bit network number.

Table 64 16-bit Network Number Subnet Planning

NO. “BORROWED”

SUBNET MASK

NO. SUBNETS

NO. HOSTS PER

HOST BITS

SUBNET

1

255.255.128.0 (/17)

2

32766

 

 

 

 

2

255.255.192.0 (/18)

4

16382

 

 

 

 

172

 

GS1510 Series User’s Guide