Real estate agents on Honolulu, Hawaii subscribe to a service called the MLS (Multiple Listing Service), which enables real estate agents to share their listings online with all other real estate agents on Honolulu – ex: Zillow.com, Realtor.com or HOMEiA.com, This means real estate agents who subscribe to the MLS can see all properties for sale on Honolulu, listed by other real estate agents. You may review the house you like, and then contact one of these real estate agents for support.