some websites not loading

I'm having issues with both my imacs for the past week with some websites not loading, mainly local websites . All the big ones , YouTube Facebook etc will load, I've narrowed it down to a problem with mac as opposed to browser as it's the same on chrome and safari. Websites will work on all other devices. Not sure if it was since last software update. One mac is a 21.5inch late 2015 on OS Monterey 12.4 , other one is 27 inch same OS