Multi Threaded TCP Port Scanner
Multi Threaded TCP Port Scanner 4.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software is categorized as Internet & Network Tools.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free software for Mac OS X is an intellectual property of SecPoint ApS.
From the developer:
Multi Threaded TCP Port Scanner helps you to scan any IP address for open ports. You can scan single or C class ranges at high speed with the multi threaded options. You can utilize the TCP Port scanner to output your open ip, neighborhood IPs and for instance your firewall. It is recommended to often scan your local and public IP or local IP addresses for accessible ports.
You may want to check out more software for Mac, such as Angry IP Scanner, Python Port Scanner or LAN Scan - Network Scanner, which might be similar to Multi Threaded TCP Port Scanner.