netstat: Sum open connections by IP (and sort it)

The following sums up all connections (ESTABLISHED, TIME_WAIT, FIN_WAIT, etc.) and sorts it:

Copynetstat -n | awk ' $5 ~ /^[0-9]/ {print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

Works on FreeBSD and Linux.