The MF232w does use standard IPP or LPR for scanning. Instead, it uses:

Get the Most Out of Your Canon MF232w: The Ultimate Scanner Driver Guide

| Operating System | Twain Driver Version | WIA Support | Network Scan Utility | 64-bit Support | | :--- | :--- | :--- | :--- | :--- | | Windows 11/10 (x64) | v11.5.0 | Yes (via WSD) | MF Scan Utility v2.4.5 | Yes | | Windows 8.1 / 7 | v11.3.2 | Yes | MF Scan Utility v2.3.1 | Yes | | macOS 12-14 | ICA (Image Capture) | N/A | Canon MF Scan Utility | Yes | | Linux (Ubuntu/Debian) | via sane-airscan or sane-canon | N/A | N/A | Yes (open source) |