I want to find all the possible ip addresses my router can send packet to. I know there is a command route print that give let me see the default gateway, but I want to get all the possible ip address the default gateway can send packets to. A reference to C++ API or command in the cmd will be great.

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    all the possible ip addresses??? Your router can send to any IP address. The question is - will the package reach it's destination. – VL-80 Mar 2 '14 at 21:12

If you have a default gateway (, then you can send to all of them. Or at least all of them that are valid. Some networks are reserved for private usage or other purposes by various standards.

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