How to find out who owns a cell tower

Start with the number on the sign

Federal rules require the owner of a registered antenna structure to post its Antenna Structure Registration (ASR) number where the public can read it: near the base of the structure, along the nearest publicly accessible road or path. If the site is fenced or gated, the number should be on the fence or gate. Where several registered towers share one fenced compound, each number goes on the fence or gate and near the base of each tower.

The ASR number is a unique seven-digit identifier the FCC assigns when a structure is registered, and it stays with that structure in every later filing. With it in hand, the lookup takes seconds.

Look the number up

There are two public places to turn the number into an owner:

1. The FCC's ASR Registration Search. Search by registration number, and the result shows the registered owner, the structure's coordinates, height, FAA study number and lighting and painting requirements. The same tool also searches by owner name, FAA study number, owner FRN or the FCC's "L number" licensee ID.
2. TowerCensus. Every registration has its own page here, built from the FCC's weekly bulk file, with the owner linked to a portfolio page listing that owner's other registered structures. Browse by state from Towers by state, or start from the owner directory.

If you are standing near a tower with no visible sign, the FCC search also works by location: enter coordinates and a radius, or a city and state, and narrow by height.

What "owner" means in the registration

The FCC defines the antenna structure owner as the person or company holding ownership, equitable ownership, dominion or title to the structure. Even if the owner hires someone else to maintain the tower, the owner remains responsible for compliance with the FCC's tower rules.

The FCC's search help describes the owner as the party responsible for registering the structure, keeping its painting and lighting in line with the rules, and telling the FCC about changes in height, coordinates, ownership, painting or lighting, and about dismantlement. Owners must report a change in height or ownership information within five days.

That makes the registered owner the right party for questions about the structure itself: a lighting outage, a lease inquiry for ground or tower space, or who to contact about a structure near your property.

The owner is often not the carrier on the tower

A single tower usually hosts antennas for several wireless carriers and other licensees, and the FCC's rules treat these as tenants: the owner must notify every tenant licensee and permittee when the structure is registered. The carrier whose logo you associate with a site is frequently a tenant renting space, not the owner.

In TowerCensus's copy of the FCC file, the largest registrant by far files as American Towers LLC, with 19,591 constructed structures under one FCC licensee ID. Entities such as Cellco Partnership, New Cingular Wireless and several companies with T-Mobile or AT&T in their names also hold large numbers of registrations, so the answer depends on the specific structure. See the largest tower owners ranking for the current order.

Why one company can appear under many names

Large owners often register structures through many separate legal entities. The FCC groups filings by a licensee ID (the "L number") rather than by brand, so a corporate family can show up as dozens of distinct owners.

In the October 2026 data, constructed structures registered to entity names beginning with "SBA" total 14,167 across 26 separate licensee IDs, and names containing "Crown Castle" account for 5,813 across 9 IDs, before counting other affiliates with different names. TowerCensus groups registrations by the FCC's licensee ID exactly as filed and does not merge corporate families, so check the parent company's other entities when you need a full portfolio.

When there is no registration to find

Registration is required only for structures that need FAA notice as a physical obstruction: in general, anything more than 200 feet above ground, or shorter structures close enough to an airport or heliport to penetrate its notification slope. Antenna structures 20 feet tall or less are exempt unless they add height to another structure.

Many cell sites fall outside that net: rooftop antennas, small cells on light and utility poles, and monopoles under 200 feet away from airports. For those, there may be no ASR record at all. The FCC's registration search only covers registered structures, so a missing result does not mean a structure is unlicensed. The carriers' own station licenses are a separate system.