fail2ban [Fail2Ban] SSH: banned 221.5 ... / 2013-05-17

fail2ban   [Fail2Ban] SSH: banned 221.5.111.162
fail2ban   [Fail2Ban] SSH: banned 221.5.111.161
fail2ban   [Fail2Ban] SSH: banned 221.5.111.160

Distributed scanning? They were also quite close in time.