Table 165 Eight Subnets; Table 166 Class C Subnet Planning; Table 167 Class B Subnet Planning; Example Eight Subnets - ZyXEL Communications 802.11g HomePlug AV ADSL2+ Gateway P-660HWP-Dx User Manual

Appendix E IP 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 class C IP address last octet values for each subnet.

Table 165 Eight Subnets

SUBNET
1
2
3
4
5
6
7
8
The following table is a summary for class "C" subnet planning.

Table 166 Class C Subnet Planning

NO. "BORROWED" HOST
BITS
1
2
3
4
5
6
7

Subnetting With Class A and Class B Networks.

For class "A" and class "B" addresses the subnet mask also determines which bits are part of
the network number and which are part of the host ID.
A class "B" address has two host ID octets available for subnetting and a class "A" address has
three host ID octets (see
The following table is a summary for class "B" subnet planning.

Table 167 Class B Subnet Planning

NO. "BORROWED" HOST
BITS
1
2
3
40
SUBNET
FIRST ADDRESS
ADDRESS
0 1
32 33
64 65
96 97
128 129
160 161
192 193
224 225
SUBNET MASK
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
255.255.255.248 (/29)
255.255.255.252 (/30)
255.255.255.254 (/31)
Table 154 on page
SUBNET MASK
255.255.128.0 (/17)
255.255.192.0 (/18)
255.255.224.0 (/19)
LAST
ADDRESS
30
62
94
126
158
190
222
254
NO. SUBNETS
2
4
8
16
32
64
128
35) available for subnetting.
NO. SUBNETS
2
4
8
P-660HWP-Dx User's Guide
BROADCAST
ADDRESS
31
63
95
127
159
191
223
255
NO. HOSTS PER
SUBNET
126
62
30
14
6
2
1
NO. HOSTS PER
SUBNET
32766
16382
8190