IEEE Comnetsat is an annual conference of the IEEE Communications Society (ComSoc) Indonesia Chapter, the IEEE Indonesia Section, and the IEEE AESS/GRSS Indonesia Joint Chapter. IEEE Comnetsat 2021 is organized by Institut Teknologi Telkom Purwokerto (ITTP) with IEEE conference. IEEE Comnetsat 2021 aims to address the current state of technology and the outcome of ongoing research in the area of Communications, Networks Satellite Systems, which covers theory, design and application of computer and communication, networks, satellite systems as well as broadband photonic systems, Artificial Intelligence, and Data Science. Accepted and presented papers will be published in the 2021 IEEE COMNETSAT Conference Proceedings and submitted to IEEE Xplore Digital Library.