is there a way to tell what ports are opened on another computer if you have the other computer's IP?

Question

I am trying to determine what ports are opened on another computer from this computer, but any port sniffer I download only tells me what ports are opened on THIS computer. So is there any port sniffer I can download where I can enter the IP of another computer and it will tell me what ports are opened on that computer, or is there another way to tell what ports are opened on it, i.e. typing the IP along with a command into a command prompt? What command would I type into the command prompt? Or is there any other way to determine what ports are opened on another computer if I have its IP? How?

I am NOT trying to hack, I am just trying to telnet to another computer which I am unable to access directly.

Answer 1

Well most computers these days have telnet OFF by default you can open yours but unless there is a server at the other end you can't just connect.

Since telnet is a very unsecure mode of communication most servers turn the service off and use SSH or other secure communication method.

I know that didn't answer you question about port scans but those will get most people in trouble quick. All of our servers auto track any scans and report the scanning ip to the ISP that owns the offending scanner. If this is a machine you should be able to access you should know what ports are open.

Answer 2

well telnet's port 23 if it's not opened then why would you need another port . that question doesn't need answering.
and port scanner's if used right will give you all needed info your doing it wrong. superscan3

Answer 3

pay attention, choose the right port scanner available as we communicate? nmap nmap is the right port scanner, and im no longer basically asserting that, it incredibly is the only port scanner that has OS detection, port provider version detections, and IDS, and firewall detection evasion. choose nmap.