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Re:Ask HN: Has my IP been banned from HackerNews? by sebkomianos on Wednesday November 20, 2013 @01:16PM (#6769812)
It's a different one each time. Some examples:

d07066ee93c0749 d07068829a60749 d0720374a2700de

Re:Ask HN: Has my IP been banned from HackerNews? by cloudflare on Wednesday November 20, 2013 @01:21PM (#6769867)
I'll poke around and have a look to see why. The Ray ID will be different each time; it's a debugging feature that identifies the request when something goes wrong.

If this persists please contact support AT cloudflare DOT com so we can track it.