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IP Subnet Calculator
Calculate IP subnet details from CIDR notation
IP Address & CIDR
CIDR Quick Reference
| CIDR | Subnet Mask | Usable Hosts |
|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 |
| /16 | 255.255.0.0 | 65,534 |
| /24 | 255.255.255.0 | 254 |
| /25 | 255.255.255.128 | 126 |
| /26 | 255.255.255.192 | 62 |
| /27 | 255.255.255.224 | 30 |
| /28 | 255.255.255.240 | 14 |
| /29 | 255.255.255.248 | 6 |
| /30 | 255.255.255.252 | 2 |
| /31 | 255.255.255.254 | 2 |
| /32 | 255.255.255.255 | 1 |
About IP Subnet Calculator
What is IP Subnet Calculator?
Calculate comprehensive subnet information from an IP address and CIDR prefix or subnet mask. Shows network address, broadcast, host range, and supports splitting subnets into smaller networks.
Features & Benefits
- Calculate network, broadcast, and host range
- Subnet mask and wildcard mask display
- IP class detection and private range check
- Subnet splitting: divide into N equal subnets
- CIDR reference table (/8 through /32)
- All calculations done client-side with bitwise ops
Frequently Asked Questions
- What is CIDR notation?
- CIDR (Classless Inter-Domain Routing) notation like /24 specifies the number of network bits. /24 = 256 addresses, /16 = 65,536 addresses.
- How many usable hosts in a /24?
- 254 usable hosts. A /24 has 256 total addresses, minus the network address and broadcast address.
- What is a wildcard mask?
- The inverse of the subnet mask. Used in ACLs and routing protocols. For /24: subnet mask 255.255.255.0, wildcard 0.0.0.255.
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