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This question already has an answer here:

Which one seems correct?

non-xx domains (those that are not prefixed with "xx" sub-domains)

Or

non-xx domains (those that are not prefixed by "xx" sub-domains)

marked as duplicate by SamBC, FumbleFingers, Davo, Nathan Tuggy, Hellion Feb 28 at 20:45

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I'll give this a quick answer, as it is not, as far as I can see, an exact duplicate of this question, albeit it is related.

'Prefixed by' and 'prefixed with' are used just about equally today, according to Google NGram. Either is fine, although in the past 'prefixed by' was used far more.

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    Yeah, you're quite right. After casting my dup closevote, I realised that the only "answer" to the issue about whether prefixed with is okay, on that earlier page, is buried away in a comment: I disagree that "prefixed with" is uncommon. I think it's actually more common. The truth of which (for AmE, but not quite yet for BrE) is borne out by the NGram I specified for myself (before discovering that I could have just waited for your link to appear here! :) – FumbleFingers Feb 28 at 16:57

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