What are the search tools for checking ABN, ACN, Registered Business Name and Trademarks?

The Australian Business Register (ABR) for checking an Australian Business Number (ABN) - http://abr.business.gov.au/

The Australian Securities & Investment Commission (ASIC) Connect site for looking up a Registered Business Name (RBN) or Australian Company Number (ACN) - https://connectonline.asic.gov.au/

Intellectual Property (IP) Australia for verifying a trade mark - http://pericles.ipaustralia.gov.au/atmoss/falcon.application_start