CIDR / Subnet Calculator
IPv4- und IPv6-Netze
| Family | IPv4 |
| Address | 192.168.1.10 |
| Prefix | /24 |
| Network | 192.168.1.0 |
| Broadcast | 192.168.1.255 |
| Subnet mask | 255.255.255.0 |
| Wildcard | 0.0.0.255 |
| First host | 192.168.1.1 |
| Last host | 192.168.1.254 |
| Total addresses | 256 |
| Usable hosts | 254 |
Über dieses Tool
Compute network details for any IPv4 or IPv6 CIDR block - network and broadcast addresses, host range, subnet mask, wildcard mask and total/usable host count. The right tool for planning subnets, debugging firewall rules, or understanding what a /24 actually contains.
Privvert handles both IPv4 (10.0.0.0/24, 192.168.1.0/16) and IPv6 (2001:db8::/48) CIDR notation. All math runs in your browser.
Funktionen
- IPv4 and IPv6 support
- Network, broadcast, first/last host addresses
- Subnet mask and wildcard mask
- Total and usable address counts
- Binary breakdown of network and host bits
- Browser-only - runs locally
- Free and unlimited
- Shows total addresses, usable hosts and the broadcast address
So funktioniert's
- Type a CIDR like 10.0.0.0/24 or 2001:db8::/48.
- Read the calculated rows.
Alles passiert direkt in deinem Browser mit JavaScript und WebAssembly. Deine Dateien werden nie hochgeladen, nie gespeichert und nie von uns gesehen.
Häufig gestellte Fragen
IPv6 doesn't reserve network/broadcast addresses the way IPv4 does, so all addresses in a block are usable for hosts. The 'total' and 'usable' counts are the same.
Subnet mask has 1s for the network portion (255.255.255.0 = /24). Wildcard mask is the inverse, with 1s for the host portion (0.0.0.255). ACLs and OSPF use wildcards; everything else uses the mask.
/32 is a single host (one address). /31 is two addresses, used for point-to-point links per RFC 3021. Below /30 traditional rules don't reserve network/broadcast addresses.
Reverse lookup (is X.X.X.X inside CIDR Y/Z) is on the roadmap. For now, use the network and broadcast columns to compare manually.
They're two ways of writing the same subnet mask. CIDR notation (the /24) counts how many leading bits are network bits; dotted-decimal notation spells out the mask as four bytes. The tool shows both for every input.
Yes. IPv6 CIDR ranges are parsed the same way - the only practical difference is that even modest IPv6 prefixes contain absurdly large address counts, which the tool displays in scientific notation.