cat sc-tunnel.log | rg "connection established" | rg "<-" | \
awk '{print $(NF -2)}' | sort | uniq | sed 's/:443//g'
rg = Ripgrep https://github.com/BurntSushi/ripgrep
For smaller files grep is sufficient
This will let you list all URLs, aka Hosts, reached by the tunnel. Especially useful if you need to check for certain sites while debugging.