Subnet Calculator    

One of the challenges in networking is knowing the boundaries of the network. Understanding where the network addressing starts and stops reduces the chance of a major catastrophe. Knowing the network boundaries is important for all network configurations and Internet Service Provider (ISP) connections.

Here you can calculate CIDR/VLSM network parameters such as subnet mask, network address and the broadcast address.

IP & Mask or CIDR:                        

Use IP & CIDR Netmask:
Or IP & Netmask:
Or IP & Wildcard Mask:

Subnet Calculator by Ray Ferguson

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