04-14-2014 04:11 AM
04-18-2014 05:11 AM
/254 is an invalid network mask. This is known as CIDR (Classless Inter-Domain Routing) notation which defines the number of bits in the address which are the network portion of the IP address. Therefore, in IPv4, because there are 32 bits in the address, your choices are from /1 through /32.
For example to scan the entire 192.168.1.0 class C subnet (192.168.1.0 through 192.168.0.255) you would specify 192.168.1.0/24. With a /24 the 1st 24 bits, 3 octets, are designated as the network portion (192.168.1) and the last octet is the host portion (.0 - .255) of the address.
If you want to scan the entire 192.168.0.0 class B network (192.168.0.0 through 192.168.255.255) then you would use 192.168.0.0/16. With a /16 the 1st 16 bits, 2 octets, are designated as the network portion.
There is a lot more to subnetting and CIDR notation but hopefully this will get you started.
04-23-2014 10:57 AM
Did Michael's answer help you? (Thank you Michael for stepping in!) The most likely network mask is 24, so you probably need to use 18.104.22.168/24. Please let me know if you are still having problems.