Subnet Calculator & IP Processor
Calculate IPv4 subnets visually and process messy lists of IP addresses in bulk. Supports deduplication, sorting, and CIDR grouping.
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How it works
This tool calculates subnet information from an IP address and CIDR notation or subnet mask. It computes the network address, broadcast address, usable host range, and total number of hosts using bitwise operations on the IP address.
Common Use Cases
- Planning IP address allocation for network segments
- Troubleshooting network connectivity issues
- Preparing for networking certifications (CCNA, etc.)
- Documenting network infrastructure
Frequently Asked Questions
What's the difference between CIDR and subnet mask?
They're equivalent. /24 = 255.255.255.0, /16 = 255.255.0.0. CIDR notation is more compact; subnet masks are more traditional.
Why are there 2 fewer usable hosts than total IPs?
The first IP is the network address and the last is the broadcast address. Neither can be assigned to hosts. A /24 has 256 IPs but only 254 usable.
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