How to find broken external links?

Hi friends. I just buy two expired domains. I create some material and i know that there are some external links and i have to redirect them.
Until now i use GWT but now i like to use if possible other way in order to avoid footprint since i plan to use the new domains for my privet web sites network.
Is there any other service or way to find this broken external links?
Thank you

You could use a backlink tool like any or all of the following to find your backlinks:

Then run all the results through a broken(404) link checker.

thank you for the answer

Thanks a lot for this nice one reply...