Pub Notice
Off the top my my bald head without the stautute being in front of me, the petitioner need only state that the respondent has moved from the State of Illinois and with due diligence, the residence of the respondent cannot be ascertained, or in the alternative, the respondent has moved and remains in the State of Illinois and the residence of that respondent cannt be found. Notice must then be published in a newspaper of general circulation published at least weekly in the county in which the action has been commenced, once a week for three consecutive weeks. I don't do publicaiton notice that often so I always refer to the statute before publishing but that's my best recollection. Trust me, I'm a lawyer.