Let's Encrypt Validation, Lighthouse, Linkdex Bot, LinkedIn Bot, LTX71, Lycos, Magpie-Crawler, MagpieRSS, Mail.Ru Bot, masscan, Mastodon Bot, Meanpath Bot, MetaInspector, MetaJobBot, MicroAdBot, Mixrank Bot, MJ12 Bot, Mnogosearch, MojeekBot, Monitor.Us, Munin, Nagios check_http, Nalez...