Assuming you mean in IPv4, then it's the broadcast address meaning all devices on the network segment should listen to and accept the packet.
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An IP number is the unique address by which you can reach an individual computer. At least, that was the original idea of IP addresses; if you want to know how this has changed in recent days, do some research on the following topics: IP address exhaustion; private IP addresses; public IP addresses; NAT.
This is not a valid IP address - a valid IP address has 4 bytes. Also, you can't guess the subnet mask from looking only at the IP address; there are usually several options.
From someone using the IP address 77.100.61.139
The IP Address
This is a very complicated subject that can only be deeply understood by professionals. Subnetting, based on my search, is letting people use your IP address to test their own. The rules would be that you can only try this 10 times for each IP address.