what's my computer doing here please?

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http://ubuntuforums.org – hi i have a raspberry pi set up with a couple of cameras. there was a problem with the wifi dropping out and it would not reconnect so i found a cron job online which seems to be working. i was just checking my logs (sudo nano /var/log/syslog) and there are some IP addresses that i do not recognize. i was wondering if anyone could please tell me what my little Pi is up to and what these addresses might be? Jun 14 07:20:46 raspberrypi dhclient:Jun 14 07:20:46 raspberrypi dhclient: Listening on LPF/wlan0/00:87:24:83:35:c2Jun 14 07:20:46 raspberrypi dhclient: Sending on LPF/wlan0/00:87:24:83: (Hardware)