start > run > type 'cmd' > then type ipconfig /all.
list of numbers should show.
Thats for windows... I doubt that will work on a MAC..
dotted decimal notation
autosummarization
Depends on the subnet. For the subnet of 192.168.1.0, the first usable IP address is 192.168.1.1. This is typical of a default wireless router setup. Valid usable IP addresses under this scenario is 192.168.1.1 to 192.168.1.254.
255.255.255.0
The default subnet mask has a standard size. The custom subnet mask allows you to make subnets that are smaller or larger than the default.
The default subnet would be 255.0.0.0 (class A)
That would depend on the router.
If this is a default subnet mask, then it would be a class C subnet mask. If you are subnetting a network and this is not the default subnet mask, then it could be either a class A or class B.
255.0.0.0The default subnet mask of a class A network is 255.0.0.0
A default gateway entry is only needed if the two computers are on different subnets. This is true whether you use IP addresses or have some sort of name resolution. The default gateway points to a router that routes packets between subnets.For instance:Computer 1 - 201.13.16.99, subnet mask 255.255.0.0Computer 2 - 199.27.12.43, subnet mask 255.255.0.0These two computers are on different subnets, and would require a router AND a default gateway entry pointing to that router to communicate.Computer 1 - 192.168.2.100, subnet mask 255.255.255.0Computer 2 - 192.168.2.67, subnet mask 255.255.255.0These two computers are on the same subnet, and will be able to communicate as long as they have a physical ethernet connection between the two. No default gateway entry or router is needed.The default gateway IP is never used by the TCP/IP stack unless a connection outside the local subnet is needed.Note that this has nothing to do with whether you use IP's or netbios names resolved by a WINS server or DNS names resolved by a DNS server. All these schemes eventually resolve down to an IP (and then to a MAC address for the actual communication) so the above still applies.
Automatic providing IP address Subnet mask DNS server Domain name Default getaway or router
255.0.0.0