who owns indochina today?

The only people who own it are the people who live there.

"Indochina" referred to the countries of Vietnam, Thailand, Myanmar (Burma), Malaysia, Laos, and Cambodia. This territory was once controlled through history by a patchwork of nations, but primarily Great Britain and France. Today, however, these countries are independent nations, and they control themselves.

In a strict sense, Indochina comprises the territory of the former French Indochina:

Cambodia

Laos

Vietnam

However, in a wider sense, the cultural region is better described as Mainland Southeast Asia in which sense it also includes:

Burma (also Myanmar—part of British India until 1937)

Singapore (also considered part of Maritime Southeast Asia if the Johor-Singapore Causeway is not taken into account)

Thailand (formerly Siam)

And, sometimes, Peninsular Malaysia

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I hope this information from the referenced Wikipedia article is helpful.

Those nations are all independent now, the French no longer have control.

Yes, all the countries are independent today.