|Your everyday productivity workspaceEnter a CIDR block to see network details, usable host range, and binary representations.
| Network address | 192.168.1.0 |
|---|---|
| Broadcast address | 192.168.1.255 |
| Subnet mask | 255.255.255.0 |
| Wildcard mask | 0.0.0.255 |
| Total hosts | 256 |
| Usable hosts | 254 |
| First usable | 192.168.1.1 |
| Last usable | 192.168.1.254 |
| Network (binary) | 11000000.10101000.00000001.00000000 |
| Mask (binary) | 11111111.11111111.11111111.00000000 |
Mask to CIDR
/24
Quick reference
| Prefix | Subnet mask | Total hosts | Usable hosts |
|---|---|---|---|
| /24 | 255.255.255.0 | 256 | 254 |
| /25 | 255.255.255.128 | 128 | 126 |
| /26 | 255.255.255.192 | 64 | 62 |
| /27 | 255.255.255.224 | 32 | 30 |
| /28 | 255.255.255.240 | 16 | 14 |
| /30 | 255.255.255.252 | 4 | 2 |
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Our free Subnet Calculator computes network address, broadcast address, subnet mask, wildcard mask, total hosts, usable hosts, and IP range from any IPv4 CIDR notation.
Also supports reverse conversion from dotted-decimal subnet mask to CIDR prefix, with binary representations and a quick-reference subnet table.
Essential for network engineers, DevOps professionals, and anyone configuring cloud VPCs, firewalls, and router subnets.
Read the full guide: Subnet calculator guide — CIDR notation and IP ranges explained
Plan AWS, GCP, or Azure subnet sizes and IP ranges.
Determine network boundaries for access control lists.
Verify whether an IP falls within a given subnet.
Practice subnet math for CCNA and cloud certifications.
Convert between CIDR and dotted-decimal subnet masks.