CIDR / Subnet Calculator
Calculate network range, broadcast address, and usable IPs from CIDR.
CIDR / Subnet Calculator
Free online IPv4 Subnet Calculator. Calculate network ranges, subnet masks, CIDR notation, and usable IP addresses. Essential for network engineers and IT professionals.
1How to Calculate Subnets
- Enter an IP address (e.g., 192.168.1.1).
- Enter the CIDR suffix (e.g., 24) or Subnet Mask.
- The tool automatically calculates network details.
- View the Network Address, Broadcast Address, and Host Range.
2Common Use Cases
- Planning network architecture and IP allocation.
- Configuring routers and firewalls.
- Troubleshooting network connectivity issues.
3Frequently Asked Questions
What is CIDR?▼
Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and IP routing. It replaces the older classful network design.
How many hosts are in a /24 subnet?▼
A /24 subnet has 256 total IP addresses, but 254 are usable for hosts (one for network address, one for broadcast).