| Class | First Octet Range | Default Subnet Mask | Private IP Range | Total Addresses | Usable Addresses |
|---|---|---|---|---|---|
| A | 0-127 | 255.0.0.0 | 10.0.0.0 - 10.255.255.255 | 16,777,216 | 16,777,214 |
| B | 128-191 | 255.255.0.0 | 172.16.0.0 - 172.31.255.255 | 65,536 | 65,534 |
| C | 192-223 | 255.255.255.0 | 192.168.0.0 - 192.168.255.255 | 256 | 254 |
| D | 224-239 | N/A (Multicast) | N/A | N/A | N/A |
| E | 240-255 | N/A (Experimental) | N/A | N/A | N/A |
| Address Type | Prefix/Range | Scope | Usage |
|---|---|---|---|
| Unicast | 2000::/3 | Global | Global Unicast (Routable) |
| Unicast | fe80::/10 | Link-Local | Link-Local (Auto-configured) |
| Unicast | fec0::/10 | Site-Local | Deprecated |
| Multicast | ff00::/8 | Varies | Multicast Communication |
| Anycast | Same as Unicast | Varies | Assigned to Multiple Interfaces |