The Science Information Network (SINET) is a Japanese academic backbone network for more than 900 universities and research institutions. It is now being used by over 3 million users and supports international research collaboration through international lines.

SINET6 began operations in April 2022, and it replaces the previous SINET5. SINET6 aims to apply 400GE nationwide, increase SINET nodes, converge fixed and mobile capabilities, enhance VPN/security services, and strengthen global connectivity.