This question already has an answer here:

How Can I know which devices connected my hotspot.
Or Where I can find list of connected devices to my hotspot.

marked as duplicate by nohillside Jun 15 '13 at 10:28

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • What kind of hotspot are you looking at here? Your WiFi router, your Mac offering Internet Sharing, your iOS device with Personal Hotspot enabled or something completely different? – nohillside Jun 15 '13 at 9:01
  • Mac's by default internet Sharing option. – milanvaja Jun 15 '13 at 9:57