Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A56050

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N44550 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A56050
Octal
51260120
Decimal
10,838,096
Country
US
Tail
N44550
Type
A21N
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
377
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S A56050.

Country allocation

The ICAO 24-bit address A56050 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
UAL1023 United Airlines 6 2026-07-25
UAL470 - 5 2026-06-18
UAL2666 United Airlines 5 2026-07-25
UAL2168 - 5 2026-07-11
UAL2124 United Airlines 5 2026-07-26
UAL2088 United Airlines 5 2026-06-12
UAL767 United Airlines 4 2026-07-26
UAL360 United Airlines 4 2026-05-26
UAL353 - 4 2026-07-06
UAL2843 United Airlines 4 2026-07-25
UAL2633 United Airlines 4 2026-04-20
UAL1994 United Airlines 4 2026-06-23
UAL1720 - 4 2026-07-11
UAL1599 - 4 2026-06-18
UAL1363 United Airlines 4 2026-05-29
UAL1338 United Airlines 4 2026-05-18
UAL670 - 3 2026-06-30
UAL647 United Airlines 3 2026-07-24
UAL571 United Airlines 3 2026-04-29
UAL534 United Airlines 3 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2451 KRK → GDN Jul 26, 19:40 UTCJul 26, 21:40 UTC2h 0m
2026-07-26 UAL2124 PDX → SFO Jul 26, 15:10 UTCJul 26, 17:20 UTC2h 10m
2026-07-26 UAL320 DEN → BOS Jul 26, 11:10 UTCJul 26, 13:10 UTC2h 0m
2026-07-26 UAL767 IAH → ANC Jul 26, 01:40 UTCJul 26, 03:35 UTC1h 55m
2026-07-26 UAL767 IAH → ANC Jul 26, 01:38 UTCJul 26, 03:33 UTC1h 55m
2026-07-25 UAL1023 DEN → TPA Jul 25, 21:20 UTCJul 25, 23:25 UTC2h 5m
2026-07-25 UAL2843 FRA → SFO Jul 25, 17:35 UTCJul 25, 19:30 UTC1h 55m
2026-07-25 UAL2666 ORD → DEN Jul 25, 13:55 UTCJul 25, 15:45 UTC1h 50m
2026-07-24 UAL2667 ORD → PHL Jul 24, 23:35 UTCJul 25, 02:45 UTC3h 10m
2026-07-24 UAL2853 DEN → EWR Jul 24, 18:45 UTCJul 24, 21:35 UTC2h 50m
2026-07-24 UAL2853 DEN → EWR Jul 24, 18:49 UTCJul 24, 21:31 UTC2h 42m
2026-07-24 UAL647 BOS → DEN Jul 24, 12:02 UTCJul 24, 16:26 UTC4h 24m
2026-07-24 UAL647 BOS → DEN Jul 24, 12:30 UTCJul 24, 16:30 UTC4h 0m
2026-07-23 UAL597 EWR → LAS Jul 23, 20:24 UTCJul 23, 23:45 UTC3h 21m
2026-07-23 UAL597 EWR → LAS Jul 23, 20:25 UTCJul 23, 23:50 UTC3h 25m
2026-07-23 UAL581 LAX → SFO Jul 23, 16:35 UTCJul 23, 18:40 UTC2h 5m
2026-07-23 UAL2616 ATL → EWR Jul 23, 11:25 UTCJul 23, 13:30 UTC2h 5m
2026-07-23 UAL2813 ORD → IAH Jul 23, 01:50 UTCJul 23, 03:45 UTC1h 55m
2026-07-22 UAL1023 DEN → TPA Jul 22, 21:15 UTCJul 22, 23:05 UTC1h 50m
2026-07-22 UAL1023 DEN → TPA Jul 22, 21:20 UTCJul 22, 22:47 UTC1h 27m
2026-07-22 UAL2843 FRA → SFO Jul 22, 17:45 UTCJul 22, 19:40 UTC1h 55m
2026-07-22 UAL2666 ORD → DEN Jul 22, 14:25 UTCJul 22, 16:20 UTC1h 55m
2026-07-19 UAL1323 EWR → JAX Jul 19, 22:30 UTCJul 20, 00:05 UTC1h 35m
2026-07-19 UAL526 DEN → LAS Jul 19, 19:20 UTCJul 19, 20:45 UTC1h 25m
2026-07-19 UAL1701 EWR → DEN Jul 19, 14:15 UTCJul 19, 17:40 UTC3h 25m
2026-07-19 UAL1701 EWR → DEN Jul 19, 13:54 UTCJul 19, 17:35 UTC3h 41m
2026-07-19 UAL3920 GVA → IAD Jul 19, 11:45 UTCJul 19, 12:20 UTC35m
2026-07-18 UAL2345 DEN → IAD Jul 18, 12:50 UTCJul 18, 16:45 UTC3h 55m
2026-07-17 UAL2667 ORD → PHL Jul 17, 23:30 UTCJul 18, 02:40 UTC3h 10m
2026-07-17 UAL2853 DEN → IAD Jul 17, 18:50 UTCJul 17, 21:50 UTC3h 0m
2026-07-17 UAL2154 LGA → DEN Jul 17, 12:10 UTCJul 17, 15:35 UTC3h 25m
2026-07-17 UAL2033 DEN → LGA Jul 17, 00:50 UTCJul 17, 04:14 UTC3h 25m
2026-07-16 UAL1565 SFO → PHX Jul 16, 20:29 UTCJul 16, 22:45 UTC2h 15m
2026-07-16 UAL660 ORD → SAN Jul 16, 15:35 UTCJul 16, 19:05 UTC3h 30m
2026-07-16 UAL368 - Jul 16, 08:00 UTCJul 16, 11:50 UTC3h 50m
2026-07-16 UAL1389 - Jul 16, 03:30 UTCJul 16, 05:35 UTC2h 5m
2026-07-15 UAL333 SEA → DEN Jul 15, 21:55 UTCJul 16, 00:05 UTC2h 10m
2026-07-15 UAL1424 DEN → SEA Jul 15, 18:00 UTCJul 15, 20:15 UTC2h 15m
2026-07-15 UAL1758 SFO → DEN Jul 15, 13:45 UTCJul 15, 15:50 UTC2h 5m
2026-07-15 UAL1007 DEN → SFO Jul 15, 01:05 UTCJul 15, 03:10 UTC2h 5m
2026-07-14 UAL540 SFO → DEN Jul 14, 21:20 UTCJul 14, 23:30 UTC2h 9m
2026-07-14 UAL1506 DEN → SFO Jul 14, 16:55 UTCJul 14, 19:15 UTC2h 20m
2026-07-14 UAL459 PDX → DEN Jul 14, 12:15 UTCJul 14, 14:20 UTC2h 5m
2026-07-14 UAL498 DEN → PDX Jul 14, 02:00 UTCJul 14, 04:10 UTC2h 10m
2026-07-13 UAL2845 MCO → DEN Jul 13, 19:55 UTCJul 13, 23:35 UTC3h 40m
2026-07-13 UAL2292 DEN → MCO Jul 13, 14:35 UTCJul 13, 17:55 UTC3h 20m
2026-07-13 UAL2666 - Jul 13, 10:05 UTCJul 13, 11:50 UTC1h 45m
2026-07-13 UAL787 - Jul 13, 02:05 UTCJul 13, 04:05 UTC2h 0m
2026-07-12 UAL714 - Jul 12, 21:45 UTCJul 13, 00:15 UTC2h 30m
2026-07-12 UAL2827 - Jul 12, 17:10 UTCJul 12, 19:10 UTC2h 0m

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 N44550 page for operator, model, and routing details .

Mode-S A56050 frequently asked

What is Mode-S code A56050?
A56050 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N44550.
Where is Mode-S A56050 registered?
Mode-S code A56050 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 A56050 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A56050, octal 51260120, decimal 10,838,096.
What flights does A56050 operate?
Mode-S A56050 has broadcast 20 distinct callsigns, including UAL1023, UAL470, UAL2666, UAL2168, UAL2124.