# http://www.opensiteexplorer.org/dotbot
User-agent: DotBot
Disallow: /
User-agent: dotbot
Disallow: /

# https://www.semrush.com/bot/
User-agent: SemrushBot
Disallow: /
User-agent: SemrushBot-SA
Disallow: /

# http://www.majestic12.co.uk/projects/dsearch/mj12bot.php
User-agent: MJ12bot
Disallow: /