Ever get one of those spam e-mails where the IP address is an integer? Type it in
here and it will be decoded:
Enter your IP address and your default router's IP address. Are you on the same subnetwork?
Compare your IP address and the IP address of your DNS server(s). Are you on the same
network as your DNS server(s)?
Remember, this principle is used for routing, too. Watch what happens when you
increment and decrement the number of bits in the subnet mask (use the arrow buttons).
If your ISP has assigned your organization multiple contiguous subnets, see if you can
determine the network prefix they use for routing to you by entering the top and bottom
IP addresses you own, then widening the network mask until they are on the same subnet!