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ip private address space

Tim Baber answered on July 20, 2023 Popularity 3/10 Helpfulness 2/10

answer ip private address space

ip private address space

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RFC 1918 allocates the following for private address space:

10.0.0.0/8
172.16.0.0/12 (not 172.0.0.0/8!!!)
192.168.0.0/16

While those are private, network engineers often use NAT to allow users on those nets to reach internet resources.

If you used 8.0.0.0/8 for private address space (for example), you would not be able to reach the google address server 8.8.8.8, because you would have an internal route for that block.

In addition, even if your “private” servers did not need to reach the internet at all, if google tried to reach your public webserver, and your public webserver had your internal routing table (with your “private” 8-net route), the replies would not get back to google.

So use the RFC1918 private address space and save yourself a bunch of trouble.

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Source: networkengineering.stackexchange.com

Tags: address-space ip private whatever

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