Contents
How many networks can be on a subnet?
| Network Bits | Subnet Mask | Number of Subnets |
|---|---|---|
| /25 | 255.255.255.128 | 512 (510) |
| /26 | 255.255.255.192 | 1024 (1022) |
| /27 | 255.255.255.224 | 2048 (2046) |
| /28 | 255.255.255.240 | 4096 (4094) |
How can you tell if two machines are on the same subnet?
The most common subnet you will see is 255.255. 255.0. So if two addresses match in the first three sections (reading left to right), and the subnet is 255.255. 255.0 for both addresses, they are in the same subnet.
What is 3rd octet?
To perform subnetting,the third octet (in this example) is used to identify unique subnets of network 150.150. 0.0. Notice that each subnet number in the figure shows a different value in the third octet, representing each different subnet number.
How can you tell if two IP addresses are on the same network?
If they are identical, the two IPs are on the same subnet. If they are not identical, they are not on the same subnet. For example, if the second AND result was also 11000000.10101000. 00000001.00000000, the two IPs would be on the same subnet.
How to subnett on the 3rd and 4th octet?
Write the octets down in binary and then count along 23 bits. We can see that the 23 rd bit falls on a ‘2’ (the number in the top row), so the subnets will go up in multiples (a block size) of 2 on the 3 rd octet: Etc… Etc… 172.19.216.0/23 is the network address we are working on. 172.19.218.0/23 is the next network address.
Which is a common size of a subnet?
/24 is a very common subnet size. It’s easy to understand because the network portion of the address is the first three octets and the host portion is the last octet. You can just read off the subnet information. Any two addresses with the same first three octets are in the same subnet.
Which is the maximum number of octets in a subnet?
The maximum number of bits in the boundary (octet) in which the subnet belongs 1st octet: 8 2nd octet: 16 3rd octet: 24 4th octet: 32 1 st octet: 8 2 nd octet: 16 3 rd octet: 24 4 th octet: 32
When is a subnet mask part of the network?
Whenever a bit in a binary subnet mask is 1, then the same bit in a binary IP address is part of the network, not the host. Since the octet 255 is 11111111 in binary, that whole octet in the IP address is part of the network.