Apparatus

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sensors Mode-S transponder

A89D59

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N654UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A89D59
Octal
52116531
Decimal
11,050,329
Country
US
Tail
N654UA
Type
B763
No current signal · last broadcast 17h ago
Flights observed
188
Distinct callsigns
20
Country
US
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S A89D59.

Country allocation

The ICAO 24-bit address A89D59 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 20 distinct

Callsign Airline Flights Last seen
UAL20 - 21 2026-07-10
UAL21 United Airlines 18 2026-07-06
UAL946 - 16 2026-07-06
UAL128 - 16 2026-06-26
UAL947 - 15 2026-07-11
UAL321 - 13 2026-07-12
UAL322 - 12 2026-07-13
UAL129 - 11 2026-06-25
UAL243 - 9 2026-07-03
UAL749 - 7 2026-07-04
UAL748 - 6 2026-07-04
UAL855 - 5 2026-07-10
UAL854 - 5 2026-07-09
UAL242 - 5 2026-07-02
UAL53 United Airlines 4 2026-06-11
UAL52 United Airlines 4 2026-06-10
UAL50 United Airlines 3 2026-05-06
UAL992 United Airlines 2 2026-05-17
UAL991 United Airlines 2 2026-05-18
UAL51 United Airlines 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL322 - Jul 13, 08:05 UTCJul 13, 17:10 UTC9h 5m
2026-07-12 UAL321 IAD → VCE Jul 12, 21:30 UTCJul 13, 06:05 UTC8h 35m
2026-07-12 UAL322 - Jul 12, 07:55 UTCJul 12, 16:50 UTC8h 55m
2026-07-11 UAL321 - Jul 11, 21:35 UTCJul 12, 05:30 UTC7h 55m
2026-07-11 UAL947 - Jul 11, 09:35 UTCJul 11, 17:40 UTC8h 5m
2026-07-10 UAL20 - Jul 10, 21:45 UTCJul 11, 06:55 UTC9h 10m
2026-07-10 UAL20 IAH → AMS Jul 10, 21:47 UTCJul 11, 06:40 UTC8h 53m
2026-07-10 UAL855 - Jul 10, 06:45 UTCJul 10, 12:40 UTC5h 55m
2026-07-09 UAL854 - Jul 9, 21:50 UTCJul 10, 03:40 UTC5h 50m
2026-07-06 UAL21 AMS → IAH Jul 6, 09:30 UTCJul 6, 19:45 UTC10h 15m
2026-07-06 UAL946 IAD → AMS Jul 6, 00:25 UTCJul 6, 07:20 UTC6h 55m
2026-07-05 UAL947 - Jul 5, 11:25 UTCJul 5, 19:20 UTC7h 55m
2026-07-05 UAL946 IAD → AMS Jul 5, 02:13 UTCJul 5, 09:15 UTC7h 2m
2026-07-05 UAL946 - Jul 5, 02:25 UTCJul 5, 04:25 UTC2h 0m
2026-07-04 UAL749 GVA → IAD Jul 4, 09:20 UTCJul 4, 18:05 UTC8h 45m
2026-07-04 UAL748 - Jul 4, 04:45 UTCJul 4, 05:30 UTC45m
2026-07-03 UAL748 - Jul 3, 22:05 UTCJul 4, 04:40 UTC6h 35m
2026-07-03 UAL243 NCE → IAD Jul 3, 08:40 UTCJul 3, 17:30 UTC8h 50m
2026-07-03 UAL243 NCE → IAD Jul 3, 08:44 UTCJul 3, 17:31 UTC8h 47m
2026-07-02 UAL242 IAD → NCE Jul 2, 21:55 UTCJul 3, 05:45 UTC7h 50m
2026-07-01 UAL331 - Jul 1, 15:20 UTCJul 1, 23:35 UTC8h 15m
2026-07-01 UAL330 IAD → CDG Jul 1, 03:20 UTCJul 1, 10:30 UTC7h 10m
2026-06-30 UAL749 GVA → IAD Jun 30, 16:50 UTCJul 1, 01:20 UTC8h 30m
2026-06-30 UAL956 EWR → GVA Jun 30, 08:15 UTCJun 30, 15:00 UTC6h 45m
2026-06-29 UAL3938 SEA → SFO Jun 29, 21:19 UTCJun 30, 00:20 UTC3h 0m
2026-06-29 UAL21 AMS → IAH Jun 29, 09:25 UTCJun 29, 19:29 UTC10h 5m
2026-06-28 UAL946 - Jun 28, 21:59 UTCJun 29, 05:09 UTC7h 10m
2026-06-28 UAL947 - Jun 28, 09:45 UTCJun 28, 12:15 UTC2h 30m
2026-06-28 UAL947 AMS → IAD Jun 28, 09:45 UTCJun 28, 17:55 UTC8h 10m
2026-06-27 UAL20 - Jun 27, 22:04 UTCJun 28, 07:05 UTC9h 0m
2026-06-27 UAL855 - Jun 27, 09:55 UTCJun 27, 12:09 UTC2h 15m
2026-06-26 UAL854 - Jun 26, 21:35 UTCJun 26, 21:50 UTC15m
2026-06-26 UAL854 IAH → LIM Jun 26, 21:42 UTCJun 27, 03:40 UTC5h 58m
2026-06-26 UAL128 - Jun 26, 05:10 UTCJun 26, 10:25 UTC5h 15m
2026-06-26 UAL128 GIG → IAH Jun 26, 00:26 UTCJun 26, 10:40 UTC10h 14m
2026-06-26 UAL128 - Jun 26, 00:24 UTCJun 26, 00:35 UTC10m
2026-06-25 UAL129 - Jun 25, 01:35 UTCJun 25, 11:15 UTC9h 40m
2026-06-24 UAL21 AMS → IAH Jun 24, 09:29 UTCJun 24, 19:24 UTC9h 55m
2026-06-23 UAL946 IAD → AMS Jun 23, 22:28 UTCJun 24, 05:10 UTC6h 42m
2026-06-23 UAL946 - Jun 23, 22:25 UTCJun 24, 04:15 UTC5h 50m
2026-06-23 UAL947 AMS → IAD Jun 23, 09:54 UTCJun 23, 18:25 UTC8h 30m
2026-06-22 UAL20 - Jun 22, 22:19 UTCJun 23, 02:15 UTC3h 55m
2026-06-22 UAL20 IAH → AMS Jun 22, 22:22 UTCJun 23, 07:19 UTC8h 57m
2026-06-22 UAL128 - Jun 22, 00:20 UTCJun 22, 01:00 UTC40m
2026-06-22 UAL128 GIG → IAH Jun 22, 00:26 UTCJun 22, 10:20 UTC9h 54m
2026-06-21 UAL129 - Jun 21, 01:35 UTCJun 21, 11:05 UTC9h 30m
2026-06-20 UAL21 AMS → IAH Jun 20, 09:19 UTCJun 20, 19:34 UTC10h 15m
2026-06-19 UAL946 - Jun 19, 22:24 UTCJun 20, 05:14 UTC6h 50m
2026-06-18 UAL749 - Jun 18, 09:25 UTCJun 18, 10:15 UTC50m
2026-06-18 UAL749 GVA → IAD Jun 18, 09:17 UTCJun 18, 17:50 UTC8h 33m

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 N654UA page for operator, model, and routing details .

Mode-S A89D59 frequently asked

What is Mode-S code A89D59?
A89D59 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N654UA.
Where is Mode-S A89D59 registered?
Mode-S code A89D59 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 A89D59 broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A89D59, octal 52116531, decimal 11,050,329.
What flights does A89D59 operate?
Mode-S A89D59 has broadcast 20 distinct callsigns, including UAL20, UAL21, UAL946, UAL128, UAL947.