Reverse DNS
An address's PTR record is set by whoever controls the address block, so on its own it proves nothing. The check that counts is resolving the name it gives back and seeing whether it returns to the same address.
Try one of these
An address's PTR record is set by whoever controls the address block, so on its own it proves nothing. The check that counts is resolving the name it gives back and seeing whether it returns to the same address.
Try one of these