How to Mark Your Drone With Your FAA Registration Number

Registration is only half of the requirement. Once the FAA issues your number, that number has to appear on the aircraft itself, so that a drone recovered from a field, a rooftop, or a lake can be connected to its operator. It is the least technical rule in the whole process and, for that reason, the one people most often leave for later and then forget.

What the rule actually requires

The marking must be legible and located on the exterior surface of the aircraft, readable without taking the drone apart. Alternatively, it may be placed inside an enclosed compartment — typically the battery bay — provided that compartment can be opened without the use of any tools. A hinged battery door or a slide-out battery tray qualifies. A panel held on by four screws does not.

For small drones there is no prescribed character height. The test is practical rather than dimensional: someone holding the aircraft in daylight should be able to read the number without a magnifier. That said, "as large as the airframe allows" is the right instinct. Use the registration number exactly as issued, including any letters, and do not abbreviate it, stylise it, or split it across two surfaces.

Choosing a spot on the airframe

The best locations are flat, light-colored, and out of the airflow: the underside of the fuselage between the landing legs, the top of the body shell behind the gimbal, or the inside of a hinged battery door. Avoid arms and props, which flex and vibrate more than anything else on the aircraft, and avoid anything hot. Motors and the area immediately around a fast-charging battery contact plate will cook an adhesive label over a season.

On folding models, check the marking is still readable when the drone is unfolded for flight as well as folded for transport — a label placed on a surface that ends up hidden behind an arm is easy to create by accident.

Labelling methods that work

Engraved metal or plastic plates. The most durable option by a wide margin. A small anodized aluminum plate with the number engraved or laser-etched, fixed with high-strength double-sided tape or a dab of epoxy, will outlast the aircraft. Ideal for drones that fly in rain, salt air, or dust.

Permanent marker directly on the shell. Free, instant, and completely acceptable. Clean the surface with isopropyl alcohol first so the ink bonds, write the number in clear block capitals, and let it dry fully. On dark shells, a white or silver paint pen reads far better than black ink. Expect to touch it up occasionally.

Laminated stickers. Print the number, laminate it or cover it with clear packing-grade film, cut it close, and apply it to a degreased surface. The lamination is what makes this work — it stops sunlight fading the print and stops moisture lifting the ink.

P-touch and similar label-printer tapes. An excellent balance of neatness and durability. Laminated cassette tape from a handheld label printer is designed to resist abrasion and UV, sticks well to plastic shells, and produces a marking that looks factory-fitted. Use the largest font the tape width allows.

Vinyl lettering or a custom engraved tag is a fine choice too, and several suppliers sell purpose-made FAA registration labels. Some providers send out free or low-cost registration labels — worth checking before you pay much for one, since the requirement is legibility, not craftsmanship.

What does not work

A loose slip of paper tucked into the battery bay is the most common failure. It falls out, it turns to pulp in damp air, and it does not constitute a marking on the aircraft.

Ordinary tape — masking tape, cellophane tape, electrical tape with a number written on it — releases as soon as the airframe warms up in the sun or after a battery cycle, and the curled edge catches airflow until it is gone.

Also avoid: plain inkjet paper stickers without lamination, which smear in the first drizzle; ballpoint or pencil on plastic, which will not bond; the number written on the battery only, which leaves the aircraft unmarked when you swap packs mid-session; and any marking placed behind a screwed-down panel.

Why the marking is worth getting right

A missing or unreadable marking is a violation of the registration requirement, and it falls inside the same enforcement framework as not registering at all — see penalties for not registering. Deliberately obscuring or removing a marking is treated more seriously still, because it implies intent to avoid identification.

The more mundane benefit is recovery. Drones do get lost, land in someone's yard, or end up in a park's lost property. A clearly marked registration number, ideally alongside a phone number or email, is the single most effective thing that gets an aircraft returned to its owner.

When the number changes

Recreational flyers normally keep the same number at renewal, so the existing marking stays valid — but confirm it against the new certificate rather than assuming. If a new number is issued, remove the old marking completely before applying the new one; two numbers on one airframe is worse than a faded single one. The same applies when you buy a used drone, as covered in selling or transferring a drone. For the renewal timeline itself, see the renewal guide and the free expiration checker.

Frequently asked questions

Where does the FAA registration number have to go on a drone?

On the exterior of the aircraft, where it can be read without disassembly. A battery compartment is also acceptable, as long as it can be opened without any tools.

How big does the registration marking have to be?

There is no minimum character height for small drones. The requirement is that the number is legible and readable in normal daylight — in practice, print it as large as the airframe comfortably allows.

Can I write my registration number with a permanent marker?

Yes. A permanent marker on a clean, light-colored surface is entirely acceptable, and is the fastest legal way to mark a drone before its first flight.

Can the number go inside the battery compartment?

Yes, provided the compartment opens without tools. If a screwdriver is needed to reach it, the marking does not meet the requirement.

Do I need to mark each of my drones?

Yes. Recreational flyers use one registration number, but every drone they fly must carry that number.

What if my number wears off mid-season?

Re-apply it before the next flight. An unreadable marking is treated as no marking, so inspect the label whenever you check the props.

Do I have to display my TRUST certificate on the drone?

No. TRUST is a certificate you carry, not a marking. Only the registration number goes on the aircraft.