Ask a friend. Social Engineering.
Forum posts history.
Player profile. Variations on points during score updates. Solar sats, some LCs, a few ships, and ships that were just built are usually the only fleet left when a player is offline. (Be wary of traps.
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Resources left on the planet.
Facebook and other networking sites.
SPY wrote:for example if in chat room u find a player he also sees u that u are online
If in chat, you can leave the main room and still PM anyone who is logged in on chat. Or just use a dummy account.
SPY wrote:if u are probing something it is eminent that he is being checked out by you.
Colonise, probe, abandon.
"how to find out a player's online time?" is a completely different question right?