Easy Subnetting

SUBNETTING

Increasing the number of network bits and decreasing the number of host bits is called subnetting.

Class C: In class c we can subnet from 1 to 6.

One bit subnetting: 192.168.0.00000000/25 mask: 255.255.255.128

Total subnets: 2¹=2. Total host in each subnet: 2⁷-2=126.

We minus last subnet mask value from 256 to find next subnet id. Ex: 256-128=128. Or Network id+ total host= last IP.

Two bits subnetting: 192.168.0.00000000/26 mask: 255.255.255.192

Total subnets: 2²=4. Total host in each subnet: 2⁶-2=62.

Three bits subnetting: 192.168.0.00000000/27 mask: 255.255.255.224

Total subnets: 2³=8. Total host in each subnet: 2⁵-2=30.

Four bits subnetting: 192.168.0.00000000/28 mask: 255.255.255.240

Total subnets: 2⁴=16. Total host in each subnet: 2⁴-2=14.

Five bits subnetting: 192.168.0.00000000/29 mask: 255.255.255.248

Total subnets: 2⁵=32. Total host in each subnet: 2³-2=6.

Six bits subnetting: 192.168.0.00000000/30 mask: 255.255.255.252

Total subnets: 2⁶=64. Total host in each subnet: 2²-2=2.

Class B: In class b we can subnet from 1 to 14.

One bit subnetting: 172.16.00000000.0/17 mask: 255.255.128.0

Total subnets: 2¹=2. Total host in each subnet: 2¹⁵-2=32766.

Two bits subnetting: 172.16.00000000.0/18 mask: 255.255.192.0

Total subnets: 2²=4. Total host in each subnet: 2¹⁴-2=16382.

Three bits subnetting: 172.16.00000000.0/19 mask: 255.255.224.0

Total subnets: 2³=8. Total host in each subnet: 2¹³-2=8190.

Four bits subnetting: 172.16.00000000.0/20 mask: 255.255.240.0

Total subnets: 2⁴=16. Total host in each subnet: 2¹²-2=4094.

Five bits subnetting: 172.16.00000000.0/21 mask: 255.255.248.0

Total subnets: 2⁵=32. Total host in each subnet: 2¹¹-2=2046.

Six bits subnetting: 172.16.00000000.0/22 mask: 255.255.252.0

Total subnets: 2⁶=64. Total host in each subnet: 2¹⁰-2=1022.

Seven bits subnetting: 172.16.00000000.0/23 mask: 255.255.254.0

Total subnets: 2⁷=128. Total host in each subnet: 2⁹-2=510.

Eight bits subnetting: 172.16.00000000.0/24 mask: 255.255.255.0

Total subnets: 2⁸=256. Total host in each subnet: 2⁸-2=254.

Nine bits subnetting: 172.16.0.00000000/25 mask: 255.255.255.128

Total subnets: 2⁹=512. Total host in each subnet: 2⁷-2=126.

Ten bits subnetting: 172.16.0.00000000/26 mask: 255.255.255.192

Total subnets: 2¹⁰=1024. Total host in each subnet: 2⁶-2=62.

Eleven bits subnetting: 172.16.0.00000000/27 mask: 255.255.255.224

Total subnets: 2¹¹=2048. Total host in each subnet: 2⁵-2=30.

Twelve bits subnetting: 172.16.0.00000000/28 mask: 255.255.255.240

Total subnets: 2¹²=4094. Total host in each subnet: 2⁴-2=14.

Thirteen bits subnetting:172.16.0.00000000/29 mask: 255.255.255.248

Total subnets: 2¹³=8192. Total host in each subnet: 2³-2=6.

Fourteen bits subnetting:172.16.0.00000000/30 mask: 255.255.255.252

Total subnets: 2¹⁴=16384. Total host in each subnet: 2²-2=2.

Class A: In class A we can subnet from 1 to 22.

One bit subnetting: 10.00000000.0.0/9 mask: 255.128.0.0

Total subnets: 2¹=2. Total host in each subnet: 2²³-2=8388606.

Two bits subnetting: 10.00000000.0.0/10 mask: 255.192.0.0

Total subnets: 2²=4. Total host in each subnet: 2²²-2=4194302.

Three bits subnetting: 10.00000000.0.0/11 mask: 255.224.0.0

Total subnets: 2³=8. Total host in each subnet: 2²¹-2=2097150.

Four bits subnetting: 10.00000000.0.0/12 mask: 255.240.0.0

Total subnets: 2⁴=16. Total host in each subnet: 2²⁰-2=1048574.

Five bits subnetting: 10.00000000.0.0/13 mask: 255.248.0.0

Total subnets: 2⁵=32. Total host in each subnet: 2¹⁹-2=524286.

Six bits subnetting: 10.00000000.0.0/14 mask: 255.252.0.0

Total subnets: 2⁶=64. Total host in each subnet: 2¹⁸-2=262142.

Seven bits subnetting: 10.00000000.0.0/15 mask: 255.254.0.0

Total subnets: 2⁷=128. Total host in each subnet: 2¹⁷-2=131070.

Eight bits subnetting: 10.00000000.0.0/16 mask: 255.255.0.0

Total subnets: 2⁸=256. Total host in each subnet: 2¹⁶-2=65534.

Nine bits subnetting: 10.0.00000000.0/17 mask: 255.255.128.0

Total subnets: 2⁹=512. Total host in each subnet: 2¹⁵-2=32766.

Ten bits subnetting: 10.0.00000000.0/18 mask: 255.255.192.0

Total subnets: 2¹⁰=1024. Total host in each subnet: 2¹⁴-2=16382.

Eleven bits subnetting: 10.0.00000000.0/19 mask: 255.255.224.0

Total subnets: 2¹¹=2048. Total host in each subnet: 2¹³-2=8190.

Twelve bits subnetting: 10.0.00000000.0/20 mask: 255.255.240.0

Total subnets: 2¹²=4096. Total host in each subnet: 2¹²-2=4094.

Thirteen bits subnetting:10.0.00000000.0/21 mask: 255.255.248.0

Total subnets: 2¹³=8192. Total host in each subnet: 2¹¹-2=2046.

Fourteen bits subnetting:10.0.00000000.0/22 mask: 255.255.252.0

Total subnets: 2¹⁴=16384. Total host in each subnet: 2¹⁰-2=1022.

Fifteen bits subnetting:10.0.00000000.0/23 mask: 255.255.254.0

Total subnets: 2¹⁵=32768. Total host in each subnet: 2⁹-2=510.

Sixteen bits subnetting:10.0.00000000.0/24 mask: 255.255.255.0

Total subnets: 2¹⁶=65536. Total host in each subnet: 2⁸-2=254.

Seventeen bits subnetting:10.0.0.00000000/25 mask: 255.255.255.128

Total subnets: 2¹⁷=131072. Total host in each subnet: 2⁷-2=126.

Eighteen bits subnetting:10.0.0.00000000/26 mask: 255.255.255.192

Total subnets: 2¹⁸=262144. Total host in each subnet: 2⁶-2=62.

Nineteen bits subnetting:10.0.0.00000000/27 mask: 255.255.255.224

Total subnets: 2¹⁹=524288. Total host in each subnet: 2⁵-2=30.

Twenty bits subnetting: 10.0.0.00000000/28 mask: 255.255.255.240

Total subnets: 2²⁰=1048576. Total host in each subnet: 2⁴-2=14.

Twenty one bits subnetting:10.0.0.00000000/29 mask: 255.255.255.248

Total subnets: 2²¹=2097152. Total host in each subnet: 2³-2=6.

Twenty two bits subnetting:10.0.0.00000000/30 mask: 255.255.255.252

Total subnets: 2²²=4194304. Total host in each subnet: 2²-2=2.