Calculate subnet masks, CIDR network ranges, usable host IPs, and broadcast addresses.
Quick reference guide for common IPv4 CIDR prefix lengths, subnet masks, and usable host counts.
| CIDR | Subnet Mask | Total IPs | Usable Hosts | Typical Use |
|---|---|---|---|---|
| /32 | 255.255.255.255 | 1 | 1 | Single Host / Loopback |
| /30 | 255.255.255.252 | 4 | 2 | Point-to-Point Links |
| /29 | 255.255.255.248 | 8 | 6 | Small Server Subnet |
| /28 | 255.255.255.240 | 16 | 14 | Branch Office Subnet |
| /27 | 255.255.255.224 | 32 | 30 | Department LAN |
| /26 | 255.255.255.192 | 64 | 62 | Medium Business LAN |
| /25 | 255.255.255.128 | 128 | 126 | Large Department Subnet |
| /24 | 255.255.255.0 | 256 | 254 | Standard Class C LAN |
| /23 | 255.255.254.0 | 512 | 510 | Supernet / Dual /24 |
| /22 | 255.255.252.0 | 1,024 | 1,022 | Campus Network Block |
| /16 | 255.255.0.0 | 65,536 | 65,534 | Standard Class B Network |
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 | Standard Class A Network |
Calculate subnet masks, CIDR network ranges, usable host IPs, and broadcast addresses.
This online diagnostic utility is powered by ToolPing to provide fast, reliable, and secure network analytics for sysadmins and developers.
Yes, ToolPing provides all IT diagnostic, network testing, and developer utilities 100% free with no registration or usage limits.
Absolutely. ToolPing does not log, store, or share your test queries, IP addresses, generated passwords, or formatted data.
Server-side diagnostics run native system commands with ultra-low latency, and browser utilities execute directly on your device for instant accuracy.
