Subnetting With Class A And Class B Networks; Table 142 Class C Subnet Planning; Table 143 Class B Subnet Planning - ZyXEL Communications P-660HW-T V2 - VERSION 3.40 User Manual

Table 141 Eight Subnets (continued)
SUBNET
5
6
7
8
The following table is a summary for class "C" subnet planning.

Table 142 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 143 Class B Subnet Planning

NO. "BORROWED" HOST
BITS
1
2
3
4
5
6
7
Appendix F IP Subnetting
SUBNET ADDRESS FIRST ADDRESS
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 130 on page
SUBNET MASK
255.255.128.0 (/17)
255.255.192.0 (/18)
255.255.224.0 (/19)
255.255.240.0 (/20)
255.255.248.0 (/21)
255.255.252.0 (/22)
255.255.254.0 (/23)
P-660HW-T v2 User's Guide
LAST ADDRESS
158
190
222
254
NO. SUBNETS
2
4
8
16
32
64
128
297) available for subnetting.
NO. SUBNETS
2
4
8
16
32
64
128
BROADCAST
ADDRESS
159
191
223
255
NO. HOSTS PER
SUBNET
126
62
30
14
6
2
1
NO. HOSTS PER
SUBNET
32766
16382
8190
4094
2046
1022
510
303