This is a pin map for the Arduino Mega 2560 Rev3. All used ports are

Ethernet Shield W5100 R3 For Arduino Mega 2560

Arduino - ArduinoBoardMega2560

Inland Mega 2560 MainBoard Arduino Compatible; 16MHz Clock Rate; 256KB Flash Memory; 8KB SDRAM - Micro Center

Excelta Vacuum Probe 2023

OBD2 for Arduino Elektor Magazine

4. Arduino Technical Details - Arduino: A Technical Reference [Book]

ARDUINO MEGA2560 REV3

This is a pin map for the Arduino Mega 2560 Rev3. All used ports are

Arduino Mega 2560 Rev3 - DFRobot