Running on your device · 0 bytes uploaded
IPv4 subnet calculator
Network, broadcast, mask, wildcard, and host counts for any CIDR — exact BigInt math, RFC 3021 /31 handling included, computed in this tab.
parsed by ip-address 10.5.0 · computed here, never looked up
| Network address | 192.0.2.128 |
|---|---|
| First usable host | 192.0.2.129 |
| Last usable host | 192.0.2.190 |
| Broadcast | 192.0.2.191 |
| Subnet mask | 255.255.255.192 |
| Wildcard mask | 0.0.0.63 |
| Usable hosts | 62 |
| Total addresses | 64 |
| Legacy class | C |
- ip-address (MIT) decides what parses; the math is the site's own BigInt layer, so a /11 or a /30 computes exactly — no float ever touches an address value.
- Usable hosts means total minus network and broadcast, the classic convention — except /31 (RFC 3021 point-to-point: both addresses usable) and /32 (one host). The convention in force is printed on every result.
- Host bits set in your input are called out, not dropped: 192.0.2.130/26 reports the 192.0.2.128 network and says why.
- The legacy class letter is a historical label — routing has been classless since CIDR (RFC 4632), and the row says so.
Done
Finished here in the tab. Nothing was uploaded.
exact values — the same engine the VLSM planner and splitter use