Apparatus

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sensors Mode-S transponder

A290F3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2645U · BOEING 777-300ER · operated by UNITED AIRLINES INC

Hex
A290F3
Octal
50510363
Decimal
10,653,939
Country
US
Tail
N2645U
Type
B77W
No current signal · last broadcast Jul 26, 08:30 UTC
Flights observed
253
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 08:30 UTC

Last known position

Most recent position reported by Mode-S A290F3.

Country allocation

The ICAO 24-bit address A290F3 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
UAL41 United Airlines 15 2026-07-23
UAL40 United Airlines 13 2026-07-22
UAL877 United Airlines 11 2026-06-02
UAL43 - 11 2026-07-20
UAL189 - 11 2026-06-23
UAL869 - 10 2026-06-21
UAL857 United Airlines 10 2026-07-25
UAL190 - 10 2026-06-24
UAL1175 - 10 2026-06-24
UAL878 - 9 2026-06-22
UAL858 - 8 2026-07-13
UAL872 - 7 2026-07-07
UAL862 United Airlines 7 2026-05-09
UAL201 - 7 2026-06-25
UAL989 United Airlines 6 2026-07-19
UAL988 - 6 2026-07-19
UAL951 United Airlines 6 2026-06-08
UAL871 - 6 2026-07-05
UAL78 - 6 2026-07-14
UAL42 United Airlines 6 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL857 ICN → PVG Jul 25, 21:22 UTCJul 26, 09:23 UTC12h 1m
2026-07-25 UAL857 ICN → PVG Jul 25, 21:30 UTCJul 25, 22:05 UTC35m
2026-07-25 UAL1960 MCO → ORD Jul 25, 13:50 UTCJul 25, 18:55 UTC5h 5m
2026-07-25 UAL2303 IAD → SAN Jul 25, 07:00 UTCJul 25, 11:35 UTC4h 35m
2026-07-24 UAL2238 IAH → SFO Jul 24, 20:50 UTCJul 25, 01:35 UTC4h 45m
2026-07-23 UAL41 FCO → EWR Jul 23, 09:35 UTCJul 23, 18:20 UTC8h 45m
2026-07-23 UAL41 FCO → EWR Jul 23, 09:27 UTCJul 23, 18:14 UTC8h 47m
2026-07-22 UAL40 EWR → FCO Jul 22, 22:25 UTCJul 23, 06:00 UTC7h 35m
2026-07-22 UAL41 FCO → EWR Jul 22, 11:10 UTCJul 22, 18:15 UTC7h 5m
2026-07-22 UAL41 FCO → EWR Jul 22, 09:27 UTCJul 22, 18:14 UTC8h 47m
2026-07-21 UAL40 EWR → FCO Jul 21, 23:03 UTCJul 22, 07:06 UTC8h 3m
2026-07-21 UAL40 EWR → FCO Jul 21, 23:30 UTCJul 22, 00:45 UTC1h 15m
2026-07-21 UAL41 FCO → EWR Jul 21, 09:30 UTCJul 21, 18:15 UTC8h 45m
2026-07-20 UAL40 EWR → FCO Jul 20, 21:48 UTCJul 21, 05:18 UTC7h 30m
2026-07-20 UAL40 EWR → FCO Jul 20, 21:40 UTCJul 20, 22:45 UTC1h 5m
2026-07-20 UAL43 - Jul 20, 17:35 UTCJul 20, 17:45 UTC10m
2026-07-20 UAL43 - Jul 20, 09:45 UTCJul 20, 11:40 UTC1h 55m
2026-07-20 UAL43 FRA → EWR Jul 20, 09:31 UTCJul 20, 17:16 UTC7h 45m
2026-07-19 UAL989 IAD → FRA Jul 19, 22:23 UTCJul 20, 06:10 UTC7h 47m
2026-07-19 UAL989 IAD → FRA Jul 19, 22:45 UTCJul 20, 06:05 UTC7h 20m
2026-07-19 UAL988 - Jul 19, 00:10 UTCJul 19, 00:55 UTC45m
2026-07-18 UAL988 - Jul 18, 11:15 UTCJul 18, 20:25 UTC9h 10m
2026-07-18 UAL42 OGG → EWR Jul 18, 00:45 UTCJul 18, 07:55 UTC7h 11m
2026-07-17 UAL41 - Jul 17, 12:50 UTCJul 17, 21:20 UTC8h 30m
2026-07-17 UAL40 EWR → FCO Jul 17, 02:54 UTCJul 17, 10:15 UTC7h 20m
2026-07-14 UAL78 - Jul 14, 08:55 UTCJul 14, 20:55 UTC12h 0m
2026-07-14 UAL78 NRT → EWR Jul 14, 08:51 UTCJul 14, 20:47 UTC11h 56m
2026-07-13 UAL837 SFO → NRT Jul 13, 20:10 UTCJul 14, 06:00 UTC9h 50m
2026-07-13 UAL858 - Jul 13, 05:31 UTCJul 13, 16:05 UTC10h 35m
2026-07-13 UAL858 PVG → SFO Jul 13, 04:44 UTCJul 13, 16:02 UTC11h 18m
2026-07-12 UAL858 - Jul 12, 10:50 UTCJul 13, 07:20 UTC20h 30m
2026-07-12 UAL858 - Jul 12, 09:30 UTCJul 13, 07:20 UTC21h 50m
2026-07-12 UAL857 SFO → PVG Jul 12, 00:12 UTCJul 12, 12:04 UTC11h 52m
2026-07-12 UAL857 - Jul 12, 00:20 UTCJul 12, 00:40 UTC20m
2026-07-10 UAL838 - Jul 10, 08:55 UTCJul 10, 09:25 UTC30m
2026-07-10 UAL838 NRT → SFO Jul 10, 08:36 UTCJul 10, 18:33 UTC9h 57m
2026-07-09 UAL837 - Jul 9, 20:10 UTCJul 10, 06:00 UTC9h 50m
2026-07-09 UAL858 - Jul 9, 06:10 UTCJul 9, 16:15 UTC10h 5m
2026-07-09 UAL858 PVG → SFO Jul 9, 05:04 UTCJul 9, 16:09 UTC11h 5m
2026-07-08 UAL857 - Jul 8, 06:50 UTCJul 9, 06:45 UTC23h 55m
2026-07-07 UAL857 - Jul 7, 21:00 UTCJul 8, 08:15 UTC11h 15m
2026-07-07 UAL872 TPE → SFO Jul 7, 02:23 UTCJul 7, 15:00 UTC12h 37m
2026-07-07 UAL872 - Jul 7, 02:25 UTCJul 7, 03:25 UTC1h 0m
2026-07-05 UAL871 SFO → TPE Jul 5, 22:08 UTCJul 6, 10:27 UTC12h 19m
2026-07-05 UAL871 - Jul 5, 22:05 UTCJul 6, 08:45 UTC10h 40m
2026-07-05 UAL872 - Jul 5, 04:45 UTCJul 5, 13:55 UTC9h 10m
2026-07-05 UAL872 - Jul 5, 02:50 UTCJul 5, 03:00 UTC10m
2026-07-03 UAL871 SFO → TPE Jul 3, 22:28 UTCJul 4, 10:34 UTC12h 6m
2026-07-03 UAL871 - Jul 3, 22:25 UTCJul 3, 22:45 UTC20m
2026-07-03 UAL858 - Jul 3, 05:25 UTCJul 3, 15:45 UTC10h 20m

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 N2645U page for operator, model, and routing details .

Mode-S A290F3 frequently asked

What is Mode-S code A290F3?
A290F3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2645U.
Where is Mode-S A290F3 registered?
Mode-S code A290F3 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 A290F3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A290F3, octal 50510363, decimal 10,653,939.
What flights does A290F3 operate?
Mode-S A290F3 has broadcast 20 distinct callsigns, including UAL41, UAL40, UAL877, UAL43, UAL189.