The company primarily operates in the US and Australia, but has hired Mulberry as its retained agency to launch its European auctions in January.
The agency will be holding press events and targeting the construction, building and engineering trade press.
IronPlanet is backed by large equipment manufacturers like Caterpillar and Volvo, and venture capital companies, such as Accel Partners.
Mulberry, which is run by CEO Chris Klopper, will be liaising with Biddy Hughes, IronPlanet's marketing manager based in the company's European headquarters in Dublin.