Subnetmask

Actually subnetmask didn't care about network address. Subnetmask correcting it sometimes. Subnetmask also have a lot of secrets.

These are the secrets hide / lies in subnetmask of 255.255.255.128 with any IP address given
1. The maksimum subnet id is would be IPaddressoct1.IPaddressoct2.IPaddressoct3.128
2. The increment would be: 256 - 128 = 128
3. The last usable address would be: 255 - 128 = 127
4. Number of subnets are: 256 / 128 = 2
5. The interesting octet would be: the 4th octet
6. The 1st octet, 2nd octet, 3rd octet would be the same value as the IP prefix

These are the secrets that hide/lies in subnetmask of 255.255.128.0 with any IP address given
1. The maximum subnet id would be: IPaddressoct1.IPaddressoct2.128.0
2. The increment would be: 256 - 128 = 128
3. The last usable address would be: 255 -128 = 127
4. Number of subnets are: 256 / 128 = 2
5. Number of host would be: number of zero * 256 *
6. The interesting octet would be: the 3rd octet
7. The 1st octet, 2nd octet, would be the same value as the IP prefix
8.The 4th octet would be 0 in the IP prefix

These are the secrets that hide/lies in subnetmask of 255.128.0.0 with any IP address given
1. The maximum subnet number would be: IPaddressoct1.128.0.0
2. The increment would be: 256 - 128 = 128
3. The last usable address would be: x.127.255.255
4. Number of subnets are: 256 / 128 = 2
5. Number of host per subnet would be: number of zero * 256 * blocksize (point 2)
6. The interesting octet would be: the 2nd octet
7. The 1st octet of the subnet ids would be the same value as the 1st octet of the IP address
8. The 3rd octet, and the 4th octet of the subnet ids would b zero.