In Segmentation Basis, how to find if it contains a particular BP or not?

Scenario: - I have created a Segmentation Model by choosing below values from the drop down list:-

Segmentation Object = Business Partners or Relationships

Usage = (have choosen one from the list related to a particular sales area)

Segmentation Basis = (have choosen one from the list which is related to Contacts)

Initially there were approximately 2,500,000 BPs but after the creation of segmentation model only 9,500 Contacts remained as these are filtered based on the values I had selected from the drop down list.

Question :- I have a Contact ID belonging to the sales area (belonging to same sales area used in the Usage field as told above) and I want to verify if this Contact ID is part of the list of 9500 Contacts. How to verify it before start working on the Segmentation Model for creating a target group?