The StrikeIron 24-hour Accurate Residential Lookup Web Services provides programmatic interfaces to directory information for any residence in the U.S. and Puerto Rico. This information is updated nightly making it the most accurate and up-to-date resource of its kind. Accurate residential listings are a fundamental need of every business. Each year, up to 60% of directory listings change, causing records to quickly become obsolete. Businesses have had to rely on labor-intensive and inaccurate sources in an attempt to keep records up-to-date, using processes that are both costly and ineffective.