If you see them on the server select, they're using the Emu LS for authentication. That doesn't mean they're publicly accessible, though. They might just use the LS for authentication when all the users connecting to it are actually on a private network, so they can get in, you can't.
0.5.7 has been out of production for some time now. I don't know of any active servers that are using that code. If any servers are, feel free to correct me on that.
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<idleRPG> Rogean ate a plate of discounted, day-old sushi. This terrible calamity has slowed them 0 days, 15:13:51 from level 48.
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