Apparatus

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sensors Mode-S transponder

A6EDC3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N54561 · operated by UNITED AIRLINES INC

Hex
A6EDC3
Octal
51566703
Decimal
10,939,843
Country
US
Tail
N54561
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
68
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A6EDC3.

Country allocation

The ICAO 24-bit address A6EDC3 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
UAL2832 - 3 2026-07-14
UAL2481 - 3 2026-07-17
UAL2446 United Airlines 3 2026-07-26
UAL534 United Airlines 2 2026-07-18
UAL526 United Airlines 2 2026-07-22
UAL498T - 2 2026-07-13
UAL459 - 2 2026-07-13
UAL3896 - 2 2026-07-04
UAL3873 - 2 2026-07-12
UAL2834 United Airlines 2 2026-07-26
UAL2769 United Airlines 2 2026-07-23
UAL259 United Airlines 2 2026-07-23
UAL2494 United Airlines 2 2026-07-24
UAL2106 United Airlines 2 2026-07-20
UAL1779 United Airlines 2 2026-07-19
UAL1714 United Airlines 2 2026-07-23
UAL1479 United Airlines 2 2026-07-26
UAL1323 United Airlines 2 2026-07-23
UAL745 United Airlines 1 2026-07-24
UAL729 - 1 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2834 GUM → SFO Jul 26, 21:30 UTCJul 26, 22:45 UTC1h 15m
2026-07-26 UAL2446 FLL → EWR Jul 26, 16:00 UTCJul 26, 19:20 UTC3h 20m
2026-07-26 UAL2446 FLL → EWR Jul 26, 16:10 UTCJul 26, 19:16 UTC3h 6m
2026-07-26 UAL1479 IAD → EWR Jul 26, 12:20 UTCJul 26, 14:25 UTC2h 5m
2026-07-26 UAL1389 CMH → DEN Jul 26, 02:45 UTCJul 26, 04:55 UTC2h 10m
2026-07-25 UAL1596 PDX → SFO Jul 25, 21:50 UTCJul 25, 23:50 UTC2h 0m
2026-07-25 UAL1561 SFO → PDX Jul 25, 17:50 UTCJul 25, 20:00 UTC2h 10m
2026-07-25 UAL2368 SFO → DEN Jul 25, 13:50 UTCJul 25, 15:40 UTC1h 50m
2026-07-24 UAL745 FLL → DEN Jul 24, 21:45 UTCJul 25, 01:20 UTC3h 35m
2026-07-24 UAL2494 IAH → EWR Jul 24, 16:42 UTCJul 24, 18:47 UTC2h 5m
2026-07-24 UAL2494 IAH → EWR Jul 24, 16:30 UTCJul 24, 19:05 UTC2h 35m
2026-07-24 UAL1740 ORD → RSW Jul 24, 12:50 UTCJul 24, 15:05 UTC2h 15m
2026-07-24 UAL2085 EWR → AUS Jul 24, 02:25 UTCJul 24, 04:25 UTC2h 0m
2026-07-23 UAL2769 DEN → LAS Jul 23, 22:10 UTCJul 24, 00:55 UTC2h 45m
2026-07-23 UAL2769 DEN → LAS Jul 23, 21:45 UTCJul 24, 00:41 UTC2h 56m
2026-07-23 UAL2865 DEN → ORD Jul 23, 17:40 UTCJul 23, 19:40 UTC2h 0m
2026-07-23 UAL1714 LAS → IAH Jul 23, 12:05 UTCJul 23, 15:25 UTC3h 20m
2026-07-23 UAL259 DEN → MCO Jul 23, 04:45 UTCJul 23, 07:50 UTC3h 5m
2026-07-23 UAL1323 EWR → JAX Jul 23, 01:50 UTCJul 23, 03:20 UTC1h 30m
2026-07-22 UAL526 AMM → IAD Jul 22, 17:40 UTCJul 22, 19:05 UTC1h 25m
2026-07-22 UAL1758 DEN → KOA Jul 22, 13:35 UTCJul 22, 15:45 UTC2h 10m
2026-07-21 UAL511 IAH → SFO Jul 21, 22:25 UTCJul 22, 02:15 UTC3h 50m
2026-07-21 UAL1755 EWR → IAH Jul 21, 16:40 UTCJul 21, 19:45 UTC3h 5m
2026-07-21 UAL1421 ORD → FLL Jul 21, 12:20 UTCJul 21, 14:50 UTC2h 30m
2026-07-21 UAL2649 ORD → LAX Jul 21, 03:20 UTCJul 21, 05:15 UTC1h 55m
2026-07-20 UAL2834 GUM → SFO Jul 20, 21:25 UTCJul 21, 01:15 UTC3h 49m
2026-07-20 UAL2446 DEN → LGA Jul 20, 16:10 UTCJul 20, 19:30 UTC3h 20m
2026-07-20 UAL1479 SFO → DEN Jul 20, 12:15 UTCJul 20, 14:25 UTC2h 10m
2026-07-20 UAL2106 IAH → EWR Jul 20, 03:33 UTCJul 20, 07:35 UTC4h 2m
2026-07-20 UAL2106 IAH → EWR Jul 20, 03:40 UTCJul 20, 07:40 UTC4h 0m
2026-07-19 UAL1779 MIA → EWR Jul 19, 21:15 UTCJul 20, 00:50 UTC3h 35m
2026-07-19 UAL1940 DEN → SAN Jul 19, 17:40 UTCJul 19, 19:25 UTC1h 45m
2026-07-19 UAL1714 MCO → DEN Jul 19, 12:15 UTCJul 19, 15:20 UTC3h 5m
2026-07-19 UAL259 DEN → MCO Jul 19, 00:35 UTCJul 19, 03:50 UTC3h 15m
2026-07-18 UAL1323 EWR → JAX Jul 18, 21:00 UTCJul 18, 22:30 UTC1h 30m
2026-07-18 UAL526 DEN → LAS Jul 18, 18:10 UTCJul 18, 19:30 UTC1h 20m
2026-07-18 UAL1701 EWR → DEN Jul 18, 12:10 UTCJul 18, 16:31 UTC4h 21m
2026-07-18 UAL534 HNL → LAX Jul 18, 02:29 UTCJul 18, 04:00 UTC1h 31m
2026-07-18 UAL534 HNL → LAX Jul 18, 02:37 UTCJul 18, 03:58 UTC1h 21m
2026-07-17 UAL2481 ORD → ORD Jul 17, 23:30 UTCJul 17, 23:35 UTC5m
2026-07-17 UAL2481 MCO → ORD Jul 17, 20:44 UTCJul 17, 23:35 UTC2h 50m
2026-07-17 UAL2481 MCO → ORD Jul 17, 20:16 UTCJul 17, 23:13 UTC2h 57m
2026-07-17 UAL1643 ORD → MCO Jul 17, 15:00 UTCJul 17, 17:15 UTC2h 15m
2026-07-17 UAL1414 BOS → ORD Jul 17, 10:15 UTCJul 17, 12:55 UTC2h 40m
2026-07-17 UAL1779 ORD → BOS Jul 17, 03:34 UTCJul 17, 05:15 UTC1h 40m
2026-07-16 UAL2088 - Jul 16, 14:10 UTCJul 17, 00:35 UTC10h 25m
2026-07-16 UAL706 LAS → ORD Jul 16, 09:05 UTCJul 16, 12:14 UTC3h 10m
2026-07-15 UAL2440 ORD → LAS Jul 15, 16:30 UTCJul 15, 19:30 UTC3h 0m
2026-07-15 UAL2616 - Jul 15, 11:20 UTCJul 15, 13:25 UTC2h 5m
2026-07-14 UAL1585 - Jul 14, 23:30 UTCJul 15, 01:25 UTC1h 55m

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 N54561 page for operator, model, and routing details .

Mode-S A6EDC3 frequently asked

What is Mode-S code A6EDC3?
A6EDC3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N54561.
Where is Mode-S A6EDC3 registered?
Mode-S code A6EDC3 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 A6EDC3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6EDC3, octal 51566703, decimal 10,939,843.
What flights does A6EDC3 operate?
Mode-S A6EDC3 has broadcast 20 distinct callsigns, including UAL2832, UAL2481, UAL2446, UAL534, UAL526.