How do I find the printer's IP address on the HP LaserJet Pro MFP M125?
Press the Setup button on the printer control panel, then open Reports, select Config Report, and press OK. The printer's IP address can be found in the Network Information section of the printed report. This IP address can also be used to access the printer's web page for configuring settings like HP Web Services. (Page 7)
From the official HP Laserjet Pro Mfp M125 manual, page 7
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