What an FCC ASR number means
An ASR number is the unique identifier assigned to an antenna structure in the Federal Communications Commission’s Antenna Structure Registration system. The record follows the structure itself and provides a consistent way to distinguish it from nearby towers, poles, rooftops, and other communications sites.
Registration is primarily an aviation-safety system. Structures that may affect navigable airspace can be subject to painting, lighting, notice, and registration requirements. That makes the database valuable for infrastructure research, but it also explains why “registered antenna structure” and “cell tower” are not interchangeable terms.
What this directory includes
Antenna Registry joins public registration, coordinate, and entity files into pages that are easier to scan. Depending on what was reported, a tower profile may show overall height above ground, ground elevation, approximate height above mean sea level, latitude and longitude, city and county, owner or registrant details, file number, registration date, and FAA study number.
What the registry does not prove
A nearby tower is not proof of mobile coverage. The public ASR files do not provide a live inventory of carriers, tenants, antennas, radio bands, lease terms, signal strength, or network capacity at each structure. A structure can support broadcasting, public safety, microwave, cellular, or several services at once.
Many real-world mobile sites also sit outside the ASR system. Short poles, rooftop installations, indoor systems, and small cells may not meet registration thresholds. For signal research, treat tower proximity as one clue alongside your phone’s field-test readings, carrier coverage information, terrain, and building materials.
Finding tower ownership information
The “owner” shown here is the entity attached to the imported FCC record. It may be a tower company, broadcaster, utility, government body, communications provider, or another registrant. Corporate names and addresses can change, so legal, transaction, or contact decisions should always be checked against the current FCC record and other authoritative sources.