Check if TCP ports are open on a host.
Scan individual ports, comma-separated lists, or ranges. Useful for verifying firewall rules and debugging connectivity.
go install github.com/clarabennettdev/portcheck@latestportcheck localhost 80,443,8080
portcheck example.com 20-25
portcheck 192.168.1.1 22,80 2000 # custom timeout (ms)MIT