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In addition Anton (and possibly the moderators) on the main site, presumably Andrew Stacey has access to information like IP addresses on meta.
Moderators do see user ip adresses on the main site. The software does not do any kind of 'geolocation' we would have to do that manually. This is rarely done since it is not very useful information to have.
Meta is actually hosted on one of my machines, so it's me, rather than Andrew Stacey, who can see the IP addresses associated to posts on meta.
Moderators, who are the people who can see your IP on the main site, are denoted by a diamond next to their name. There's a list of them in the FAQ.
In addition, at least some people at stack exchange probably have some access to this information.
To summarize, the people who can see your ip when you use mathoverflow.net are the site moderators and the subset of the stackexchange team who has access to the mathoverflow.net server data.
Interestingly, the SE 2.0 software prevents joro's suggestion from working, as they grab and serve a local copy of embedded images.
If you are going to worry about people knowing your IP it should be about those who are doing it indecently rather than those doing it decently :)
To be clear:
Although we do not disclose private user information to third parties, MathOverflow moderators make no claim regarding the privacy of users. (We don't own the software nor the servers, so we are in no position to protect user information.) In order to maintain your privacy, you must take appropriate precautions when using MathOverflow (e.g. using an anonymizing proxy service). This is one of the reasons why we discourage but don't disallow the use of pseudonyms and posts from unregistered users, for example.