What’s the Best Proxy Checker for Reliable Results? or How Do You Test if a Proxy is Working? Any Goo

For quick checks, I just use Hidemy.name’s proxy checker. It’s free and does the job.

Not the most advanced, but it’s better than manually testing each one.

And yeah, the "live but dead" thing is usually because the proxy is overloaded or banned. A good checker should test under load.