On the iPad, how do I tell what version of Mobile Safari I have?

Since Ross McNab's answer appears to no longer work...

Bookmark this (or any) page - then edit the bookmark - call it what you like, but change the url to...

javascript:alert(navigator.userAgent)

Now you can check your user agent any time you feel like conveniently from your bookmarks - thanks Apple!

Or if it's just a quick one-off check you want and you're connected to the 'net, do what T.J. originally posted.

The only way I've found Ross McNab's way was much better but sadly no longer works (thanks, Apple); Billy Moon's way works but is a bit awkward for one-off checks.

Another way to do this is to use an external website (there are plenty to choose from, just search on "what's my browser"), which will report my user-agent string back to me.

So for instance, these sites will report back to me that my user-agent string is:

Mozilla/5.0 (iPad; U; CPU OS 4_3_5 like Mac OS X; en-gb) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5

...from which I can tell that I'm using Mobile Safari 5.0.2.

You can get the userAgent string without visiting an external website, by typing the following in the Safari address bar (where you would normally type a URL):

javascript:alert(navigator.userAgent)

You must type it exactly as it appears here, matching case and punctuation.

An alert popup will appear with the full useragent string, which contains the version number of Safari and iOS.

None of the javascript answers worked for me. I found an easier way! There are several "what's my IP address?" pages out there, such as this one. These pages tell you your IP address and, in some cases, what your browser is, what your operating system is, and if your browser is up to date.