As per the state official website of the Schedule cast and Schedule tribes department, "Ahir" are considered as an Backward cast of Block B.

I am attaching the official website link, you can also check it for more information and clarification. Aheri and Aheria is also there, so don't get confused.

http://haryanascbc.gov.in/list-of-backward-classes

(//Haryanahsbc.gov)