Use Google Webmaster Tools and Download the latest links file. You can also take a look at Ahrefs, Majestic SEO and Open Site Explorer. All of those require a

Use Google Webmaster Tools and Download the latest links file. You can also take a look at Ahrefs, Majestic SEO and Open Site Explorer. All of those require a subscription though. You will most likely be fine just using link data provided from Google itself.