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Free online IPv4 subnet calculator for network planning. Calculate subnets, ranges, broadcast addresses, and host counts from CIDR notation.
Supports: CIDR (192.168.1.0/24), IP + mask (192.168.1.0 255.255.255.0), or IP/slash-mask (192.168.1.0/255.255.255.0)
Calculates IPv4 subnet details from CIDR notation, subnet mask, or slash-mask input. Displays network address, broadcast address, subnet mask, wildcard mask, usable host range, total and usable host counts, and a binary representation of the network address and mask.
Manually computing subnet boundaries, host ranges, and broadcast addresses is tedious and error-prone. This tool accepts multiple input formats (CIDR, subnet mask, or slash-mask) and instantly returns all critical subnet details with a binary visualization.
Network administrators, DevOps engineers configuring cloud VPCs and container networks, and students learning IP subnetting fundamentals.
Enter an IPv4 address with CIDR notation (e.g., 192.168.1.0/24), a subnet mask (e.g., 192.168.1.0 255.255.255.0), or a slash-mask (e.g., 192.168.1.0/255.255.255.0)
Press Calculate or hit Enter to compute subnet details
Review the network address, broadcast address, subnet mask, wildcard mask, and usable host range
Check the binary view to visually verify the network and host portions of the address
Input: '192.168.1.0/24' — Output: Network: 192.168.1.0, Broadcast: 192.168.1.255, Subnet Mask: 255.255.255.0, Host Range: 192.168.1.1 - 192.168.1.254, Usable Hosts: 254Input: '10.0.0.0 255.255.0.0' — Output: Network: 10.0.0.0, Broadcast: 10.0.255.255, Subnet Mask: 255.255.0.0, CIDR: /16, Usable Hosts: 65,534CIDR notation (192.168.1.0/24), IP + subnet mask (192.168.1.0 255.255.255.0), or IP/slash-mask (192.168.1.0/255.255.255.0).
It is the bitwise inverse of the subnet mask, commonly used in ACLs and routing protocols.
/31 subnets use point-to-point conventions where both addresses can be assigned to hosts.
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