I want to know, can I raise my hand for dua with all fasting people before iftar.

Answered according to Hanafi Fiqh by Darulifta-Deoband.org

بسم الله الرحمن الرحيم

(Fatwa: 1060/1039/H=10/1437)

You may raise your hands. However it is better for everyone to supplicate individually for himself.

Allah knows Best!

Darul Ifta,
Darul Uloom Deoband