Multiple Listing Service Network Protocol (MLSN)
Multiple Listing Service Network (MLSN) Protocol is a request response messaging protocol for allowing users to query property listing information on reserved internet port 32801. The numbering scheme is comprised of two parts separated by an '@' symbol: (1) a triple-dotted notation of three decimal integers ranging from 1 to 65,535 and (2) a double-dotted notation number composed of a postal code and country code standardized by ISO 3166-1. Taking in consideration for expired listings, MLSN offers a reusable feature which allows assigning a new, double-dotted notation number to a preexisting triple-dotted number thereby creating a new MLSN property listing number. Together with a standard protocol and unique numbering schema, MLSN provides a Uniform Resource Locator (URL) to users for conducting a more efficient and convenient real estate property searching on the Internet.
MLSN standard is currently in working draft status.