hmm network printer?
Um you got some router prefs that can show whats connected to the router? should show the printers IP there.
on mine i can goto diagnostics / show routing table and get.
Key: C - connected, S - static, R - RIP, * - default, ~ - private
* 0.0.0.0/ 0.0.0.0 via 188.8.131.52, WAN1
S 184.108.40.206/ 255.255.255.255 via 220.127.116.11, WAN1
C~ 192.168.0.0/ 255.255.255.0 is directly connected, LAN
* 18.104.22.168/ 255.255.255.255 via 22.214.171.124, WAN1
shows my current devices ip's that way, you may have somethig similar.