IP Subnet & CIDR Calculator
Free ToolCalculate IPv4 subnet masks, network addresses, broadcast addresses, wildcard masks, usable host IP ranges, and total assignable hosts from CIDR prefix.
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IPv4 Subnetting & Network CIDR Engine
IP Subnet & CIDR Calculator
Calculate subnet masks, network addresses, broadcast addresses, usable host IP ranges, and wildcard masks for any IPv4 CIDR prefix.
Subnet Network Summary
Network Address (ID)
Broadcast Address
Subnet Mask
Usable Host IP Range
Wildcard Mask (ACLs)
Total Usable Hosts
Total Addresses ($2^{32-n}$)
Scope & Class
Frequently Asked Questions
Classless Inter-Domain Routing (CIDR) represents an IP address and its associated network prefix length (e.g. 192.168.1.0/24 indicates a 24-bit subnet mask 255.255.255.0).
Usable hosts are computed as $2^{(32 - ext{prefix})} - 2$, subtracting the dedicated Network Address and Broadcast Address.