Facebook’s custom IPv6 range

0 min read 122 words

I noticed an interesting thing with a certain visitor after posting a blog post to Facebook.

The IP address that the Facebook crawler uses to visit the site on callback to get meta-data has a custom IPv6 sub-range.

IPv6: 2a03:2880:ff:1a::face:b00c
Host: fwdproxy-prn-026.fbsv.net

Notice 2a03:2880:ff:1a::<strong>face:b00c</strong>

How this is done

The IPv4 addresses could only use regular integers (decimal); numbers between 0 and 9.

However, IPv6 can use any and all hexadecimal; 0-9 and a-f.

This means that when allocating a sub-range, they chose the face and b00c as they are all greater or equal to a and less than or equal to f.

Closing remarks

If you know about, or see other companies that are doing something similar, please tell me about it!

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Andrew
Andrew

Andrew is a visionary software engineer and DevOps expert with a proven track record of delivering cutting-edge solutions that drive innovation at Ataiva.com. As a leader on numerous high-profile projects, Andrew brings his exceptional technical expertise and collaborative leadership skills to the table, fostering a culture of agility and excellence within the team. With a passion for architecting scalable systems, automating workflows, and empowering teams, Andrew is a sought-after authority in the field of software development and DevOps.

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