If you are getting this IP from your ISP you must ask them. It most likely is 255.255.255.248 This IP seems to be a Default Gateway, your address would be 74.176.12.142 with the above mentioned subnet mask. Now if this is for your homewaork or exam, then this answer is not correct and you should have paid attention in class to Subnets.
The correct term is subnet mask instead of subnet mass. A subnet mask separates an IP address into the host address and the network address. It is a 32-bit number that can mask an IP address.
Example IP address of 192.168.1.123 with a subnet mask of 255.255.255.0
This is a network address
255.255.255.0
what is the subnet mask for this hst IP prefix format ? Host IP Address: 183.91.104.16
Because each IP defines certain subnet mask.
Subnet mask for the above is 255.0.0.0
if the ip address is 192.168.2.1 then the subnet mask should be 255.255.255.0
it is a class c address..so default subnet mask is 255.255.255.0 it is a private address...
255.255.0.0
255.255.255.0
That depends on the subnet's subnet mask.