Number and adresses of nated clients

I'm using Pf to Nat connection. I was wondering if there would be any program or script which shows number and adresses of nated clients. Is there anything like this?
 
I forgot to add that I would like also to see number of active connectoins. I had something simmilar on linux. It was simple script which got informations from conntrack and showed them in simple form: <address> <number connections>
 
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