IPv4 Subnetting (Class A, Class B and Class C)
Each IP class is supplied with its own default subnet mask that bounds
that IP class to own prefixed variety of Networks and prefixed number of Hosts
per network. classful IP addressing doesn’t give any flexibility of getting
less number of Hosts per Network or a lot of Networks per IP Class.
Network Bits
|
Subnet Mask
|
Bits
Borrowed
|
Subnets
|
Hosts/Subnet
|
8
|
255.0.0.0
|
0
|
1
|
16777214
|
9
|
255.128.0.0
|
1
|
2
|
8388606
|
10
|
255.192.0.0
|
2
|
4
|
4194302
|
11
|
255.224.0.0
|
3
|
8
|
2097150
|
12
|
255.240.0.0
|
4
|
16
|
1048574
|
13
|
255.248.0.0
|
5
|
32
|
524286
|
14
|
255.252.0.0
|
6
|
64
|
262142
|
15
|
255.254.0.0
|
7
|
128
|
131070
|
16
|
255.255.0.0
|
8
|
256
|
65534
|
17
|
255.255.128.0
|
9
|
512
|
32766
|
18
|
255.255.192.0
|
10
|
1024
|
16382
|
19
|
255.255.224.0
|
11
|
2048
|
8190
|
20
|
255.255.240.0
|
12
|
4096
|
4094
|
21
|
255.255.248.0
|
13
|
8192
|
2046
|
22
|
255.255.252.0
|
14
|
16384
|
1022
|
23 255.255.254.0 15
|
32768
|
510
|
||
24 255.255.255.0 16
|
65536
|
254
|
||
25 255.255.255.128 17
|
131072
|
126
|
||
26 255.255.255.192 18
|
262144
|
62
|
||
27 255.255.255.224 19
|
524288
|
30
|
||
28 255.255.255.240 20
|
1048576
|
14
|
||
29 255.255.255.248 21
|
2097152
|
6
|
||
30 255.255.255.252 22
|
4194304
|
2
|
||
Classless Inter Domain Routing provides the pliability of borrowing bits of Host a part of the IP address and victimisation them as Network in Network, referred to as Subnet. By victimisation subnetting, one single class A IP address will be used to have smaller sub-networks that provides higher network management capabilities.
IPv4 Class A Subnets
In Class A, solely the first octet is used as Network symbol and
remainder of 3 octets are used to be assigned to Hosts (i.e. 16777214 Hosts per
Network). to create a lot of subnet in class A, bits from Host part are
borrowed and therefore the subnet mask is modified consequently.
IPv4 Class B Subnets
By default, using Classful Networking, fourteen bits
are used as Network bits providing (214) 16384 Networks and (216-1)
65534 Hosts. class B IP Addresses will be subnetted constant means as class A
addresses, by borrowing bits from Host bits. Below is given all potential
combination of class B subnetting:
Network Bits
|
Subnet Mask
|
Bits Borrowed
|
Subnets
|
Hosts/Subnet
|
16
|
255.255.0.0
|
0
|
1
|
65534
|
17
|
255.255.128.0
|
1
|
2
|
32766
|
18
|
255.255.192.0
|
2
|
4
|
16382
|
19
|
255.255.224.0
|
3
|
8
|
8190
|
20
|
255.255.240.0
|
4
|
16
|
4094
|
21
|
255.255.248.0
|
5
|
32
|
2046
|
22
|
255.255.252.0
|
6
|
64
|
1022
|
23
|
255.255.254.0
|
7
|
128
|
510
|
24
|
255.255.255.0
|
8
|
256
|
254
|
25
|
255.255.255.128
|
9
|
512
|
126
|
26
|
255.255.255.192
|
10
|
1024
|
62
|
27
|
255.255.255.224
|
11
|
2048
|
30
|
28
|
255.255.255.240
|
12
|
4096
|
14
|
29
|
255.255.255.248
|
13
|
8192
|
6
|
30
|
255.255.255.252
|
14
|
16384
|
2
|
IPv4 Class C Subnets
Class C IP addresses are ordinarily assigned to a really little size
network as a result of it will only have 254 hosts per network. Given below may
be a list of all potential combination of subnetted class B IP address:
Class C ip addresses are usually allotted to
small size network as a result of it will solely have 254 hosts in an
exceedingly network. Given below could be a list of all potential combination
of subnetted class B ip address:
Network Bits
|
Subnet Mask
|
Bits Borrowed
|
Subnets
|
Hosts/Subnet
|
24
|
255.255.255.0
|
0
|
1
|
254
|
25
|
255.255.255.128
|
1
|
2
|
126
|
26
|
255.255.255.192
|
2
|
4
|
62
|
27
|
255.255.255.224
|
3
|
8
|
30
|
28
|
255.255.255.240
|
4
|
16
|
14
|
29
|
255.255.255.248
|
5
|
32
|
6
|
30
|
255.255.255.252
|
6
|
64
|
2
|
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