Attentio is a corporate intelligence service in Belgium. They have a web crawler which identifies itself as:
Attentio/Nutch-0.9-dev (Attentio's beta blog crawler; www.attentio.com; email@example.com)"
This crawler has no public benefit and the way Attentio uses the collected data qualifies them as hostile.
Their crawler operates from IP range 18.104.22.168/19. It does follow the Robots Exclusion Standard.