Reserved IP Address Ranges

CIDR (Classless Inter Domain Routing) is a method for allocating IP addresses for IP routing. According to IANA, certain address blocks are reserved (for various purposes). The following are reserved for Private-Use only.

• 10.0.0.0/8
• 172.16.0.0/12
• 192.168.0.0/16

A lot of cloud providers use the first one as it can support up to 16,777,216 devices.

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• IANA IPv4 Special-Purpose Address Registry
• IANA - Protocol Registries
• IP / CIDR Calculator
• Master IP Subnetting (and cloud considerations)