Grepping for IP addresses that way is awesome!
Totally forgot about doing it that way as i mostly use grep and awk together

Extracting IP addresses from kippo.log and listing how many separate connections each of them made:

​
cat kippo.log | grep 'New connection:' | awk '{print $6}' | cut -d ':' -f1 | sort | uniq -c | sort -r


12 98.76.54.32
9 67.89.12.34
3 109.87.65.43
2 234.56.78.9
1 109.87.65.43