Print out list of open connection and sort by ip address

# netstat -atun | awk '{print $5}' | cut -d: -f1 | sed -e '/^$/d' |sort | uniq -c | sort -n

Output:

1 10.0.77.52
2 10.1.11.3
4 12.109.42.21
6 12.191.136.3
.....
...
....
13 202.155.209.202
18 208.67.222.222
28 0.0.0.0
233 127.0.0.1