IPTool
Fast system administrator tools
Menu
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Enter IPv4 and mask (dotted) or prefix (/24).
| IP/Mask | — |
|---|---|
| IP/Prefix | — |
| Binary IP | — |
| Binary mask | — |
| Network | — |
| IPs available in network | — |
| Network address | — |
| Broadcast address | — |
Reference: reserved blocks
| 127.0.0.0/8 | Loopback, address of the current device. |
|---|---|
| 10.0.0.0/8 | Private (internal) networks |
| 100.64.0.0/10 | For use in service provider networks (CGNAT) |
| 169.254.0.0/16 | Link-local addresses are often used for automatic network address configuration when external sources are unavailable. |
| 172.16.0.0/12 | Private (internal) networks |
| 192.0.0.0/29 | Dual-Stack Lite |
| 192.0.2.0/24 | For documentation examples |
| 192.168.0.0/16 | Private (internal) networks |
| 198.51.100.0/24 | For documentation examples |
| 203.0.113.0/24 | For documentation examples |
| 224.0.0.0/4 | For multicast |
| 240.0.0.0/4 | Reserved for future use |
| 255.255.255.255/32 | Broadcast address |
What it is
The IPv4 calculator derives network, host range, mask and broadcast from an address and CIDR prefix.
How it works
Enter an IPv4 like 192.168.1.10/24 or address + mask. The tool shows network, min/max host and address count.
Examples
10.0.0.1/8→ network10.0.0.0, hosts10.0.0.1–10.255.255.254.192.168.1.0/26→ 62 hosts.
Limitations & notes
Calculations follow classic IPv4 rules. For VLSM, validate each subnet separately. Private ranges are not routed on the public Internet.
FAQ
- CIDR vs mask? CIDR is prefix length; mask is the bitmask form.
- Why network/broadcast are reserved? They cannot be assigned to hosts.