Number Resource Information: ANI II Digit Assignments. This is a breakdown of what the code after your phone number means when you call an ANI2 number such as 101-073-217-709-889-664.
You can download it from the following link: https://packetstormsecurity.com/files/download/26291/ani_ii_assignments.htm
Source: https://packetstormsecurity.com/files/26291/ani_ii_assignments.htm.html