Another interesting fact that came up with the processing of SSH banners which were captured on March 2013, is the amount of hosts using deprecated versions of SSH.

Out of 1900734 IPs, the results are the following:

SSH Version Number of Hosts
2.0 1678331
1.99 172907
1.5 21281
1.4 6
1.3 2
modified version 13

Modified versions included heavy alterations of the SSH banner, such as “SSH Secret” and “SSH 4.00”.