How to find the IP address range of a specific VLAN

[nabeelkhan8086]

Could someone please explain me as to how to find the IP address range of a specific VLAN

Below is an example which you can use for reference.

How will I find the IP address range of VLAN 100, VLAN 200 and VLAN 300.
172.29.6.2/25 vlan 100
172.29.7.66/26 vlan 200
172.29.7.135/25 vlan 300

[marce1000]

 - The question does not correlate , a VLAN when it is being used as an ip-subnet can have ip address range(s) assigned provided the network manager (role) does a proper job.

 M.

[Reza Sharifi]

172.29.6.2/25 vlan 100 range is 172.29.6.1-126

172.29.7.135/25 vlan 300 range is 172.29.7.1-126

172.29.7.66/26 is already covered in the other range 

So, vlan 200 needs a different subnet that is not covered under vlan 300

HTH

[Jaderson Pessoa · Accepted solution]

@nabeelkhan8086 hello,

Check steps below;

How will I find the IP address range of VLAN 100, VLAN 200 and VLAN 300.
172.29.6.2/25 vlan 100 = 172.29.6.0 255.255.255.128

1         1         1          1          1          1        1         1

128    64        32        16        8          4         2        1

128    192      224      240      248      252   254      255

/25     /26      /27       /28      /29       /30     /31      /32

NETWORK: 172.29.6.0/25 = 172.29.6.0 255.255.255.128

NETWORK                           FIRST IP VALID           LAST IP VALID            BROADCAST

REDE1 - 172.29.6.0           172.29.6.1                       172.29.6.126          172.29.6.127    < VLAN100

REDE2 - 172.29.6.128       172.29.6.129                   172.29.6.254          172.29.6.255

NETWORK: 172.29.7.62/26

NETWORK                           FIRST IP VALID           LAST IP VALID            BROADCAST

REDE1 - 172.29.7.0          172.29.7.1                       172.29.7.62              172.29.7.63

REDE2 - 172.29.7.64        172.29.7.65                     172.29.7.126            172.29.7.127  < VLAN 200

REDE3 - 172.29.7.128      172.29.7.129                   172.29.7.190            172.29.7.191  < VLAN 300

REDE4 - 172.29.7.192      172.29.7.193                   172.29.7.254            172.29.7.255

i wrote in portuguese, sorry ^^

obs: change mask of vlan from 300 /25 to /26

Regards,

[luis_cordova · Accepted solution]

Hi @nabeelkhan8086 ,

Just to add a little to what has already been said.
To find the networks associated with a specific host, you can change that host to bit and mark the location of the mask.
This process will indicate the associated network and the ranges of each one:

172.29.6.2/25 = 172.29.6.0|000 0010

Network: 172.29.6.0 = 172.29.6.0|000 0000

Range: 172.29.6.0|000 0001(172.29.6.1) - 172.29.6.0|111 1111(172.29.6.127)

172.29.7.66/26 = 172.29.7.01|00 0010

Network: 172.29.7.64 = 172.29.7.01|00 0000

Range: 172.29.7.01|00 0001(172.29.7.65) - 172.29.6.01|11 1111(172.29.7.127)

172.29.7.135/25 = 172.29.7.1|000 0111

Network: 172.29.7.128 = 172.29.7.1|000 0000

Range: 172.29.7.1|000 0001(172.29.7.129) - 172.29.6.1|111 1111(172.29.7.255)

You should consider that the last IP of each range corresponds to the broadcast address of that network, so it cant be used to address any host.

Regards