DP83867 has internal pullups or pulldowns on most pins. The data sheet details which pins have internal pullups or pulldowns and which pins require external pull resistors.

Even though a device may have internal pullup or pulldown resistors, a good practice is to terminate unused inputs rather than allowing them to float. Floating inputs could result in unstable conditions. This recommendation does not apply to VDD1P8 pins. When unused, these pins should be left floating. It is considered a safer practice to pull an unused input pin high or low with a pullup or pulldown resistor. It is also possible to group together adjacent unused input pins, and as a group pull them up or down using a single resistor.