portscan is a simple TCP port scanner written in Go.
Usage of portscan:
-host string
Host or IP to scan (default "localhost")
-range string
Port ranges e.g. 80,443,200-1000,8000-9000 (default "80,443")
-threads int
Threads to use (default 100)
-timeout duration
Timeout per port (default 1s)
-verbose
Show errors for failed ports