Network Tools
Subnet and CIDR calculator, IP converter, MAC vendor lookup and a port reference – fully offline.
IPv4 · IPv6CIDRMACPorts
Examples: 10.0.0.1/8 · 172.16.5.4 255.255.240.0 · 2001:db8::/48
Calculated in your browser – nothing is sent to the server, no network connections are made.
Split subnet
| # | Subnet | First host | Last host | Broadcast / last |
|---|
Comments after # are ignored. Host bits are cleared automatically.
Aggregated
Overlaps
CIDR → range
| CIDR | Start | End | Addresses |
|---|
Range → CIDR
CIDR splitter
Examples: 3232235777 · 0xC0A80101 · 2001:0db8:0000::0001 · ::ffff:10.0.0.1
Calculated in your browser – nothing is sent to the server, no network connections are made.
Letter case
Vendors come from a bundled copy of the IEEE OUI registry. No external lookups.
| Port | Protocol | Service | Description |
|---|
Static reference only – this tool never scans ports.