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.
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.
if the ip address is 192.168.2.1 then the subnet mask should be 255.255.255.0
Subnet mask for the above is 255.0.0.0
it is a class c address..so default subnet mask is 255.255.255.0 it is a private address...
That depends on the subnet's subnet mask.
255.255.255.0
255.255.0.0
There is no set subnet mask for different ip configurations. The most common default subnet mask is 255:255:255:0 though, if that helps.