Linux: How to scan remote host for open ports ?
Linux : How to find a remote port is opened or not ? Helllo Team, If you are trying to findout whether a remote server port is opened or closed, then there are so many ways. Here In this article I am posting on same using telnet and nc commands. Using telnet Telnet usually holds prompt, so to avoid that, we are using echo in front of the command. > $ echo | telnet xxxxxx 22 Trying xxxxxx .. . Connected to xxxxx. Escape character is '^]' . Connection closed by foreign host. Using nc with nc command, its direct. > $ nc -z -v -u xxxxx 22 Connection to xxxx port 22 [ udp/ssh ] succeeded ! # -z: Just perform scans without sending any data to the respective service running on the given port. # -v : Verbose # -u: UDP packets, without this it will be default tcp. Hope it helps. Thanks