Table of Contents
What Is an RFC 1918 CIDR Block and Why Are Private IPs Important?
Learn how to identify RFC 1918 CIDR blocks. Discover why the 10.0.0.0/8 IP address range is reserved for private networks and how these blocks help conserve public IPv4 addresses.
Question
Which is an RFC 1918 CIDR block?
A. 192.16.0.0/16
B. 8.8.8.8/8
C. 10.0.0.0/8
D. 172.168.0.0/12
Answer
C. 10.0.0.0/8
Explanation
To keep the internet organized and ensure we don’t run out of public IP addresses, a networking standard called RFC 1918 was created. This standard specifically sets aside three “blocks” of IP addresses strictly for private use within internal networks, like your home Wi-Fi or a corporate office. These private blocks are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Option C correctly identifies the 10.0.0.0/8 block, which is the largest of the three, offering over 16 million usable addresses for massive enterprise networks. The other options listed are either public IP addresses (like 8.8.8.8) or slightly mistyped versions of the actual private ranges.
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