If a computer have an IP address is 10.1.1.5 and subnet mask is 255.255.255.0 then what does it mean.

It means this is a host ip which is in the Class A private address, with subnet 255.255.255.0, which means in the subnetwork range of 10.1.1.0

The given ip address is converted network to host bit

The range come like
Class A network

Subnet mast: 255.255.255.0
Mask Bit : 24
Max Subnet : 65534
Max Host per subnet : 254
Subnet Host Host address range : 10.1.1.1 - 10.1.1.254
Subnet ID : 10.1.1.0
Subnet Broadcast : 10.1.1.255
if you convert into binary it come : 00001010.00000001.00000001.00000101

That means, the given IP address belongs to class a address and it is a private ip address, range of private class a addresses is (10.0.0.0 to 10.255.255.255)

In general, if you have X.Y.Z.W and subnet mask 255.0.0.0, or 255.255.0.0, or 255.255.255.0. the 255 octet indicates the fixed range of the network ID, and 0s indicates that IPs you can use..

Example x.y.z.w subnet mask 255.255.255.0, the x.y.z are fixed, and w are the usable IPs that you may use for your network. as you notice 0-255 = 256 IPs - 2 ( 1 IP for Network ID, and 1 IP for Broadcasting) = 254 usable IPs...

If a computer has such an address, it means that it has got a class A ip address range but it has been subnetted. it can have 253 hosts in this subnet.

Hi,

If a Computer has ip address 10.1.1.5 and subnet Mask 255.255.255.0 then it means it is classless ip address where class is not defined or not a subnetted ip address.

It means that it is in class c network