Welcome to WebmasterWorld Guest from 22.214.171.124
and about 3 minutes later with:
Mozilla/5.0 (Windows NT 6.1; Win64; x64; +https://www.ubtsupport.com/legal/Streamline3Bot.php) Streamline3Bot/1.0
That is it, just M.
UBT provides a classification service for public websites based on their content. To classify your website, we use the Streamline3Bot to crawl the web on a daily basis.