What is an easy way to get someones pubkey?

Also can I Whitelist people on my umbrella private relay using npubs? or is only by pubkeys? 

 Reverse Engineer their npub back to pubkey 

 How?  

 you can also write your own Bech32 encoding decoding script since that is whats described 

 But there is no website that has that listed for nostr accounts? 

 Listed what? 

 Never mind I found it. 
Nostr.band shows pubkeys for accounts. 

 Smh Coracle shows as well