Apparatus

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sensors Mode-S transponder

ADD665

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N991AL · operated by AIRPLANE FACTORY INC

Hex
ADD665
Octal
53353145
Decimal
11,392,613
Country
US
Tail
N991AL
Type
SLG2
No current signal · last broadcast 2d ago
Flights observed
142
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S ADD665.

Country allocation

The ICAO 24-bit address ADD665 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N991AL - 142 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-02 N991AL - Jul 2, 21:15 UTCJul 2, 21:30 UTC15m
2026-07-01 N991AL TOA → TOA Jul 1, 18:50 UTCJul 1, 19:55 UTC1h 5m
2026-06-30 N991AL TOA → TOA Jun 30, 23:25 UTCJul 1, 00:50 UTC1h 25m
2026-06-30 N991AL TOA → TOA Jun 30, 19:30 UTCJun 30, 20:50 UTC1h 20m
2026-06-28 N991AL - Jun 28, 21:45 UTCJun 28, 22:49 UTC1h 5m
2026-06-28 N991AL - Jun 28, 20:19 UTCJun 28, 21:10 UTC50m
2026-06-28 N991AL - Jun 28, 19:04 UTCJun 28, 19:25 UTC20m
2026-06-27 N991AL CLD → TOA Jun 27, 01:00 UTCJun 27, 01:49 UTC50m
2026-06-26 N991AL TOA → CLD Jun 26, 23:55 UTCJun 27, 00:44 UTC50m
2026-06-26 N991AL TOA → TOA Jun 26, 21:39 UTCJun 26, 22:40 UTC1h 0m
2026-06-26 N991AL TOA → TOA Jun 26, 19:30 UTCJun 26, 20:44 UTC1h 15m
2026-06-26 N991AL TOA → TOA Jun 26, 01:34 UTCJun 26, 02:34 UTC1h 0m
2026-06-25 N991AL TOA → TOA Jun 25, 23:49 UTCJun 26, 00:39 UTC50m
2026-06-25 N991AL - Jun 25, 21:50 UTCJun 25, 22:54 UTC1h 5m
2026-06-25 N991AL TOA → TOA Jun 25, 18:39 UTCJun 25, 19:34 UTC55m
2026-06-25 N991AL - Jun 25, 01:35 UTCJun 25, 02:30 UTC55m
2026-06-24 N991AL TOA → TOA Jun 24, 23:34 UTCJun 25, 00:29 UTC55m
2026-06-24 N991AL - Jun 24, 21:44 UTCJun 24, 22:45 UTC1h 0m
2026-06-24 N991AL TOA → TOA Jun 24, 19:34 UTCJun 24, 20:24 UTC50m
2026-06-24 N991AL TOA → TOA Jun 24, 17:40 UTCJun 24, 18:50 UTC1h 10m
2026-06-24 N991AL - Jun 24, 00:40 UTCJun 24, 00:55 UTC15m
2026-06-22 N991AL - Jun 22, 23:20 UTCJun 22, 23:29 UTC10m
2026-06-22 N991AL - Jun 22, 21:30 UTCJun 22, 22:24 UTC55m
2026-06-20 N991AL CLD → LGB Jun 20, 21:30 UTCJun 20, 22:20 UTC50m
2026-06-20 N991AL - Jun 20, 20:25 UTCJun 20, 21:14 UTC50m
2026-06-20 N991AL - Jun 20, 01:24 UTCJun 20, 02:59 UTC1h 35m
2026-06-19 N991AL - Jun 19, 21:44 UTCJun 19, 22:55 UTC1h 10m
2026-06-19 N991AL - Jun 19, 19:29 UTCJun 19, 20:34 UTC1h 5m
2026-06-18 N991AL - Jun 18, 22:45 UTCJun 18, 23:00 UTC15m
2026-06-18 N991AL LGB → LGB Jun 18, 21:30 UTCJun 18, 21:50 UTC20m
2026-06-18 N991AL TOA → LGB Jun 18, 19:45 UTCJun 18, 20:00 UTC15m
2026-06-18 N991AL - Jun 18, 18:50 UTCJun 18, 19:00 UTC10m
2026-06-18 N991AL - Jun 18, 01:15 UTCJun 18, 02:30 UTC1h 15m
2026-06-17 N991AL - Jun 17, 21:55 UTCJun 17, 23:15 UTC1h 20m
2026-06-17 N991AL - Jun 17, 20:10 UTCJun 17, 20:55 UTC45m
2026-06-17 N991AL LGB → LGB Jun 17, 01:40 UTCJun 17, 02:50 UTC1h 10m
2026-06-16 N991AL - Jun 16, 23:55 UTCJun 17, 00:50 UTC55m
2026-06-16 N991AL - Jun 16, 21:50 UTCJun 16, 22:55 UTC1h 5m
2026-06-16 N991AL - Jun 16, 19:50 UTCJun 16, 20:55 UTC1h 5m
2026-06-16 N991AL LGB → LGB Jun 16, 17:35 UTCJun 16, 19:00 UTC1h 25m
2026-06-16 N991AL LGB → LGB Jun 16, 00:00 UTCJun 16, 00:10 UTC10m
2026-06-10 N991AL - Jun 10, 00:00 UTCJun 10, 01:00 UTC1h 0m
2026-06-09 N991AL - Jun 9, 21:25 UTCJun 9, 22:55 UTC1h 30m
2026-06-09 N991AL - Jun 9, 19:10 UTCJun 9, 20:30 UTC1h 20m
2026-06-01 N991AL - Jun 1, 20:50 UTCJun 1, 21:30 UTC40m
2026-06-01 N991AL LGB → LGB Jun 1, 19:05 UTCJun 1, 20:00 UTC55m
2026-05-30 N991AL TOA → LGB May 30, 04:30 UTCMay 30, 04:55 UTC25m
2026-05-30 N991AL - May 30, 00:00 UTCMay 30, 00:50 UTC50m
2026-05-29 N991AL - May 29, 21:45 UTCMay 29, 22:55 UTC1h 10m
2026-05-29 N991AL TOA → TOA May 29, 19:50 UTCMay 29, 20:10 UTC20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N991AL page for operator, model, and routing details .

Mode-S ADD665 frequently asked

What is Mode-S code ADD665?
ADD665 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N991AL.
Where is Mode-S ADD665 registered?
Mode-S code ADD665 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is ADD665 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD665, octal 53353145, decimal 11,392,613.
What flights does ADD665 operate?
Mode-S ADD665 has broadcast 1 distinct callsign, including N991AL.