Facebook share shows correct share url when I use domain name and on ip address

when I share something like

mydomain.com/mypage/xxx

facebook gives me correct share link

but w开发者_如何学Chen i try

111.222.333.444/mypage/xxx

it shares the home page of my site insted of the page I referred to

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Sharing ip-based url's sounds like a bad idea. Why do you need to do that? As a workaround, you could use a URL shortener like bit.ly with your ip-based url. If you really need to share a URL with an IP address, log a bug with Facebook.