Knockout City Will Shut Down In June - Game Informer

Velan Studios is creating a private server version so players can host their own games, though.

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Knockout City is being shut down on June 6, 2023 : r/gamernews

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Game Informer Issue 070 February 1999, PDF, Video Game Development Companies

Welcome to the Future of Knockout City in Season 6: City of Tomorrow - Xbox Wire

Knockout City Season 9 Will Be Its Last, Servers Shut Down on 6th June

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Knockout City Is Officially Free-To-Play, Season 6 Now Live - Game Informer

Knockout City is permanently shutting down on June 6

Knockout City Will Be Shutting Down In June