sshscan is a horizontal SSH scanner that scans large swaths of IPv4 space for a single SSH user and pass. It uses iplist.txt as the input of IP addresses in the form of X.X.X.X, X.X.X.X/XX, X.X.X.X-X.X.X.X, or X.X.X.X-X with X-X in any octet.
You can download it from the following link: https://packetstormsecurity.com/files/download/118402/sshscan-0.9.txt
Source: https://packetstormsecurity.com/files/118402/SSH-Scan-0.9.html