Ever need an IP or port scanner but didn’t have one installed or the permission to install one? Here’s a quick trick I came up with using the little used built-in functions of the Windows Command-line:
for /L %A in (1,1,254) do ping -n 1 192.168.1.%A
FOR /L %A IN (1,1,254) DO FOR /L %B IN (1,1,1024) DO telnet 192.168.1.%A %B
Windows has a built-in for loop function and when used with the /L switch, it will act like a traditional counting for loop as in C and other program languages.
The code loops through values from 1 to 254, incrementing by 1 and pings 192.168.1.%A, where %A is the value of the loop variable.
The second line of code uses nested loops to telnet to IP addresses in the same range as above and port numbers from 1 to 1024 inclusive. There is a hitch where if it connects it just hangs there, but you can only work with what you got.
Here’s a sample run: