ppscan is yet another portscanner. However, it can scan an entire Class C subnet for a range of ports not only using tcp-syn/tcp-connect but also by tunneling through HTTP proxies (either HTTP GET or HTTP CONNECT), or using FTP servers which allow arbitrary connections via PORT bounce method. It is multi-threaded, so it can blaze through connection attempts.
You can download it from the following link: https://packetstormsecurity.com/files/download/82897/ppscan-0.3.tar.gz
Source: https://packetstormsecurity.com/files/82897/PPScan-Portscanner-0.3.html