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It's a Japanese sentence ending, used to seek agreement/confirmation. Similar to "right?" or "isn't it?" in English.

The Chinese sentence ending is 呢 (ne in Mandarin), it would be interesting to know if that's related.

(I've just started learning Mandarin, and enjoy looking at the origin of words and characters.)

"Innit" is slang in Britain, used at the end of a sentence. It doesn't have to mean "isn't it", but could be "aren't you", "won't you" etc.

Japanese; you put it on the end of a statement to make it a question instead, e.g. "the server is up to date, ne?" to mean "is the server up to date?"

That's incorrect, that interrogation particle (for making the question in your example) is か. ね is different.

ね is the colloquial way of turning a statement into a question.

It's a japanese character (from hiragana script), and AFAIK used like this it means something like "isn't it?"/"shouldn't it?".

http://enwp.org/ね