For instance I'm looking at an example:
Find the subnet ID (network ID I presume)
IP address : 184.108.40.206
Subnet mask : 255.255.240.0
I'm able to convert this into binary :
I assume we have default allocation which is /16 and after this I'm confused not sure what to do next,
Thank you for your help in advance.
With this given information, you're trying to determine which class B subnet that the IP address belongs. I will begin the process so you can see if you can determine which one.
So a class B begins with 16 bit subnet mask. You've added an additional 4 bits to it from the HOST bits. These 4 bits now becomes your network IDs.
165.245.0000|0000.00001110 = 220.127.116.11
255.255.1111|0000.00000000 = 255.255.240.0
165.245.0001|0000.00001110 = 18.104.22.168
165.245.0010|0000.00001110 = 22.214.171.124
165.245.0011|0000.00001110 = 126.96.36.199
165.245.0100|0000.00001110 = 165.245.___.0
165.245.0101|000000001110 = 165.245.___.0
165.245.0110|0000.00001110 = 165.245.___.0
165.245.0111|0000.00001110 = 165.245.___.0
165.245.1000|0000.00001110 = 165.245.___.0
165.245.1001|0000.00001110 = 165.245.___.0
165.245.1010|0000.00001110 = 165.245.____.0
165.245.1011|0000.00001110 = 165.245.___.0
165.245.1100|0000.00001110 = 165.245.XXX.0
165.245.1101|0000.00001110 = 165.245.XXX.0
165.245.1110|0000.00001110 = 165.245.XXX.0
165.245.1111|0000.00001110 = 165.245.XXX.0
Examples of Class A and Class B, you may want to look into the Cisco CCNA show there is an example there. At the Network+ level, we're really introducing you to the concept and we must start and stay with Class C.
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