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ADDRESSING
IP Range Calculator
Find the number of addresses and the inclusive range between two IPv4 addresses.
IPV4 REFERENCE
IPv4 address ranges
Historical classful ranges are shown for reference. Modern IPv4 networks use CIDR rather than Class A, B or C addressing.
| Class | Address range | Purpose |
|---|---|---|
| A | 1.0.0.0 – 126.255.255.255 | Historical Class A |
| B | 128.0.0.0 – 191.255.255.255 | Historical Class B |
| C | 192.0.0.0 – 223.255.255.255 | Historical Class C |
| D | 224.0.0.0 – 239.255.255.255 | Multicast |
| E | 240.0.0.0 – 255.255.255.255 | Experimental / reserved |
Important IPv4 special-use ranges
| CIDR | Address range | Purpose |
|---|---|---|
| 10.0.0.0/8 | 10.0.0.0 – 10.255.255.255 | Private |
| 172.16.0.0/12 | 172.16.0.0 – 172.31.255.255 | Private |
| 192.168.0.0/16 | 192.168.0.0 – 192.168.255.255 | Private |
| 100.64.0.0/10 | 100.64.0.0 – 100.127.255.255 | Shared Address Space / CGNAT |
| 127.0.0.0/8 | 127.0.0.0 – 127.255.255.255 | Loopback |
| 169.254.0.0/16 | 169.254.0.0 – 169.254.255.255 | Link-local |
| 0.0.0.0/8 | 0.0.0.0 – 0.255.255.255 | Special use |