Despite Sony releasing a list of games to have their online capabilities turned off, it appears that PS3 title Starhawk was missed off the list. The servers for the game were turned off on 30th June 2018, and was announced with a mere notice on the game’s page on the PlayStation Store.
The single-player mode will still work, which was a given away as a PlayStation Plus title way back in September 2012.
The notice on the PlayStation Store reads:
Multiplayer features for Starhawk will be terminated and no longer be available after June 30th, 2018. The single-player campaign and any other offline content will continue to be playable.