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.
broadcast
Welles knew all along that the broadcast wasn't a true story (apex)
Address line is for your current address or P.O box.
Address 1) House number and street name Address 2) City or town Address 3) State and/or county Address 4) Zip or postal code Address 5) Country [optional]
The address before the next valid network address will be the broadcast address For Example:192.168.1.64 the broadcast address is 192.168.1.127
The IP address 255.255.255.255 is reserved for local broadcast.
The broadcast address on IPv4 networks is the subnet address, padded on the right with ones. For example, if the subnet address is 192.168.x.y, with a subnet mask of 255.255.0.0, then the broadcast address is 192.168.255.255.
It is a broadcast address
Ff:ff:ff:ff:ff:ff
the Ip address is used to broadcast messages, such as the Emergency Broadcast message recived on your television
The web address of the Museum Of Broadcast Communications is: http://www.museum.tv
local network broadcast
.248
172.16.70.47
This is easy to calculate due to the mask used. The network address would be 10.10.10.0 and the broadcast address would be 10.10.10.255.
When you set up a sub network you decide upon the subnet mask and this determines the network address (all zeros in the subnet portion of the address) and the broadcast address (all ones in the subnet portion of the address). When you assign the host addresses in your subnet, then you use the addresses between the network address and the broadcast address.