IPv4 network classes
Your IP address identifies the “neighborhood” your node is in.
“Private IP addresses” are not assigned by the IANA (Internet Assigned Numbers Authority)
| Addresses | CIDR Equivalent | Purpose | RFC | Class | Total # of addresses |
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| 0.0.0.0 - 0.255.255.255 | 0.0.0.0/8 | Zero Addresses | RFC 1700 | A | 16,777,216 |
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| 10.0.0.0 - 10.255.255.255 | 10.0.0.0/8 | Private IP addresses | RFC 1918 | A | 16,777,216 |
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| 127.0.0.0 - | 127.0.0.0/8 | Localhost Loopback Address | RFC 1700 | A | 16,777,216 |
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| 127.255.255.255 |
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| 169.254.0.0 - | 169.254.0.0/16 | Zeroconf | RFC 3330 | B | 65,536 |
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| 172.16.0.0 - 172.31.255.255 | 172.16.0.0/12 | Private IP addresses | RFC 1918 | B | 1,048,576 |
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| 192.0.2.0 - 192.0.2.255 | 192.0.2.0/24 | Documentation and Examples | RFC 3330 | C | 256 |
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| 192.88.99.0 - 192.88.99.255 | 192.88.99.0/24 | IPv6 to IPv4 relay Anycast | RFC 3068 | C | 256 |
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| 192.168.0.0 - | 192.168.0.0/16 | Private IP addresses | RFC 1918 | C | 65,536 |
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| 192.168.255.255 |
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| 198.18.0.0 - 198.19.255.255 | 198.18.0.0/15 | Network Device Benchmark | RFC 2544 | C | 131,072 |
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| 224.0.0.0 - | 224.0.0.0/4 | Multicast | RFC 3171 | D | 268,435,456 |
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| 239.255.255.255 |
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| 240.0.0.0 - | 240.0.0.0/4 | Reserved | RFC 1700 | E | 268,435,456 |
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| 255.255.255.255 |
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