What exactly has to be on an envelope to a prison.?

so it goes by..



name and DOC number (whats DOC number?)



prison name



box number (what and how do i know what this is)



city, state,zip code.What exactly has to be on an envelope to a prison.?
DOC is the same thing as the prisoners inmate #, you may have to call the prison to find out what that # is if you don't already know it.What exactly has to be on an envelope to a prison.?
DOC is probably department of correction. If you do not know all this just put the prisoner's full name and send it to the prison, get its address off the web. So for example for NYS prisons http://www.docs.state.ny.us/faclist.html