Are you asking which device they are coming from? If so, this is in the message:
Apr 1 09:13:55 10.1.2.1 34219: *Mar 24 17:51:13: %SYS-5-CONFI
G_I: Configured from console by vty0 (172.12.12.12)
10.1.2.1 is the device where the messages are coming from.
Is this what you are asking??