If these are hosted on a print server, you can go to the properties of a printer and click on the ports tab. You can get the IP address from there. Otherwise, you will have to print out the printer config from each printer.
You can also do WRKDEVD DEVD(*PRT) which will give you a display of your printer devices, then place a 6=Print beside each device description which will cause a Display Device Description report to be created. Unfortunately there will be 1 report for each printer device, but it does have the IP Address.
Hope this helps,