Subnet Mask Calculator
Free networking calculators for CCNA students & engineers
Subnet Mask Calculator launched on April 7, 2026.
What it does
Free online subnet mask calculator. Instantly calculate network address, broadcast address, wildcard mask, host range and CIDR notation. Perfect for CCNA students and network engineers.
Enter an IP address and CIDR prefix to instantly calculate network address, broadcast, host range, wildcard mask, and more. A subnet mask is a 32-bit number that divides an IP address into two parts: the network portion and the host portion . It tells routers which part of an IP address identifies the network and which part identifies the specific device. For example, a subnet mask of 255.255.255.0 means the first 24 bits identify the network and the last 8 bits identify individual hosts. This is written as /24 in CIDR notation. Enter any valid IPv4 address in the first field (e.g. 192.168.10.50 ). Then set your CIDR prefix length — the number after the slash. For a typical home or office…from netcalc.online
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