you're probably looking for Titanium Network or SysYa (SysYa has now been shut down).
if you need more urls join the Titanium Network discord.

this domain expired so I claimed it :D
THIS DOMAIN IS NOT FOR SALE. PLEASE JOIN THE ABOVE DISCORD FOR NEW UNBLOCKING SITES.
if you have any use for a domain that's probably blocked on every school's filter message me on discord CompactCow#4717 and I can get you a subdomain or something
i will not use this domain to host your proxy site