Any tools that can scan ports which are opened on server

Dear All

Any tools that can scan ports which are open in the internet ? such as i have port mapping to one of the server, and i want to verify which port has been opened for this server, any good tool i can use ? i,m currently using "angry ip" but only allow to scan 1 port number at a time, is there any tools that i can scan for example port 1 - 1024 at once for a server ?

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bbaoIT ConsultantCommented:
the most well-known free and open source scanner is NMAP. the latest version is 6.4 and available on multiple platforms. try it here.

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