Then you'll need a software. Check my signature. It does more then just checking domains. I'm still using this software to expand my PBN.
Scrapebox gets a lot of false positives for domains. You get excited and realize it is registered. Just do a custom bot, pretty simple if you don't expect too much.
Did a simple one in ubot so far single threaded but does the trick vs. copy and paste and then the same for the results.