Which IPv4 address ranges are reserved for private use?

Which IPv4 address ranges are reserved for private use?

• A. 10.0.0.0/8
• B. 172.16.0.0/12
• C. 192.168.0.0/16
• D. All of the above

Answer: (D)

Private IPv4 addresses are blocks reserved for use inside local networks and are not routable on the public Internet. The ranges 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are all designated for private use by RFC 1918. This means they can be reused in different networks without conflicting globally. The 10.0.0.0/8 block covers 10.x.x.x, the 172.16.0.0/12 block spans 172.16.x.x through 172.31.x.x, and the 192.168.0.0/16 block covers 192.168.x.x. In practice, devices on home or corporate networks use these addresses and rely on NAT to access public resources, translating to a public IP when needed. All of these ranges are private, so they are reserved for private use.

Private IPv4 addresses are blocks reserved for use inside local networks and are not routable on the public Internet. The ranges 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are all designated for private use by RFC 1918. This means they can be reused in different networks without conflicting globally. The 10.0.0.0/8 block covers 10.x.x.x, the 172.16.0.0/12 block spans 172.16.x.x through 172.31.x.x, and the 192.168.0.0/16 block covers 192.168.x.x. In practice, devices on home or corporate networks use these addresses and rely on NAT to access public resources, translating to a public IP when needed. All of these ranges are private, so they are reserved for private use.