Visvo claims that VisBot is a Nutch based bot that crawls websites "in preparation for a new type of search software". The full user agent string for this bot is "VisBot/2.0+(Visvo.com+Crawler;+
http://www.visvo.com/bot.html;+bot@visvo.com)".
Visvo claims that this bot is using
63.133.162.98 IP address however I saw requests from
72.249.60.74.
VisBot does requests robots.txt although I did not have a chance to check whether it obeys robots.txt instructions. I am going to block this bot until Visvo.com provides more details on what they are doing with the data.