Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6ED3B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N54525 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A6ED3B
Octal
51566473
Decimal
10,939,707
Country
US
Tail
N54525
Type
A21N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
441
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A6ED3B.

Country allocation

The ICAO 24-bit address A6ED3B 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
UAL321 United Airlines 6 2026-05-10
UAL2835 - 6 2026-07-22
UAL1583 - 6 2026-06-18
UAL1941 United Airlines 5 2026-05-17
UAL1495 United Airlines 5 2026-04-18
UAL1377 - 5 2026-07-20
UAL747 United Airlines 4 2026-05-19
UAL706 United Airlines 4 2026-07-20
UAL704 United Airlines 4 2026-06-03
UAL647 - 4 2026-07-17
UAL558 - 4 2026-06-30
UAL2061 United Airlines 4 2026-06-04
UAL1972 United Airlines 4 2026-04-27
UAL1874 - 4 2026-07-18
UAL1842 United Airlines 4 2026-05-10
UAL1382 United Airlines 4 2026-04-28
UAL1332 United Airlines 4 2026-06-13
UAL1231 - 4 2026-06-28
UAL800 - 3 2026-07-01
UAL746 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1801 BUR → SFO Jul 26, 21:50 UTCJul 26, 22:45 UTC55m
2026-07-26 UAL2475 ORD → CLE Jul 26, 16:45 UTCJul 26, 19:15 UTC2h 30m
2026-07-26 UAL2280 LAX → BOS Jul 26, 13:10 UTCJul 26, 15:15 UTC2h 5m
2026-07-26 UAL368 EWR → FLL Jul 26, 07:30 UTCJul 26, 11:15 UTC3h 45m
2026-07-26 UAL2179 LGA → ORD Jul 26, 00:25 UTCJul 26, 04:35 UTC4h 10m
2026-07-25 UAL1641 IAD → SFO Jul 25, 18:10 UTCJul 25, 21:50 UTC3h 40m
2026-07-25 UAL2300 ORD → PWM Jul 25, 12:10 UTCJul 25, 16:00 UTC3h 50m
2026-07-24 UAL1998 ORF → ORD Jul 24, 23:30 UTCJul 25, 01:15 UTC1h 45m
2026-07-24 UAL2329 RNO → SFO Jul 24, 20:05 UTCJul 24, 21:40 UTC1h 35m
2026-07-24 UAL587 EWR → MSP Jul 24, 14:15 UTCJul 24, 17:45 UTC3h 30m
2026-07-24 UAL587 EWR → MSP Jul 24, 14:08 UTCJul 24, 17:50 UTC3h 42m
2026-07-23 UAL1107 SAN → SFO Jul 23, 21:50 UTCJul 24, 01:45 UTC3h 55m
2026-07-23 UAL2475 ORD → CLE Jul 23, 16:50 UTCJul 23, 19:10 UTC2h 20m
2026-07-23 UAL2280 LAX → BOS Jul 23, 12:50 UTCJul 23, 14:50 UTC2h 0m
2026-07-23 UAL368 EWR → FLL Jul 23, 06:55 UTCJul 23, 10:25 UTC3h 30m
2026-07-23 UAL2179 LGA → ORD Jul 23, 00:30 UTCJul 23, 04:35 UTC4h 5m
2026-07-22 UAL2835 - Jul 22, 18:45 UTCJul 22, 22:05 UTC3h 20m
2026-07-22 UAL2835 SEA → ORD Jul 22, 18:36 UTCJul 22, 21:36 UTC3h 0m
2026-07-22 UAL341 EWR → BOS Jul 22, 13:00 UTCJul 22, 17:00 UTC4h 0m
2026-07-21 UAL2088 SJU → ORD Jul 21, 22:00 UTCJul 22, 01:20 UTC3h 20m
2026-07-21 UAL2088 SJU → ORD Jul 21, 20:15 UTCJul 21, 20:30 UTC15m
2026-07-21 UAL2088 SJU → ORD Jul 21, 20:10 UTCJul 22, 01:04 UTC4h 54m
2026-07-21 UAL1996 ORD → SJU Jul 21, 14:15 UTCJul 21, 18:20 UTC4h 5m
2026-07-20 UAL706 LAX → ORD Jul 20, 22:05 UTCJul 21, 01:25 UTC3h 20m
2026-07-20 UAL2440 ORD → AUS Jul 20, 17:10 UTCJul 20, 20:25 UTC3h 15m
2026-07-20 UAL1377 DEN → ORD Jul 20, 12:18 UTCJul 20, 14:03 UTC1h 45m
2026-07-20 UAL1377 DEN → ORD Jul 20, 12:15 UTCJul 20, 14:15 UTC2h 0m
2026-07-20 UAL1974 SFO → LAX Jul 20, 00:40 UTCJul 20, 02:40 UTC2h 0m
2026-07-19 UAL617 DEN → ORD Jul 19, 20:55 UTCJul 19, 23:05 UTC2h 10m
2026-07-19 UAL1729 LGA → DEN Jul 19, 16:00 UTCJul 19, 19:25 UTC3h 25m
2026-07-19 UAL1442 PHL → LGA Jul 19, 02:10 UTCJul 19, 02:45 UTC35m
2026-07-18 UAL1442 DEN → PHL Jul 18, 14:20 UTCJul 18, 18:55 UTC4h 35m
2026-07-18 UAL1874 - Jul 18, 10:25 UTCJul 18, 12:20 UTC1h 55m
2026-07-18 UAL475 EWR → MCO Jul 18, 02:05 UTCJul 18, 03:55 UTC1h 51m
2026-07-17 UAL484 - Jul 17, 21:34 UTCJul 17, 23:30 UTC1h 55m
2026-07-17 UAL1599 - Jul 17, 19:09 UTCJul 17, 19:45 UTC35m
2026-07-17 UAL1599 - Jul 17, 17:50 UTCJul 17, 19:05 UTC1h 15m
2026-07-17 UAL647 BOS → DEN Jul 17, 11:55 UTCJul 17, 15:44 UTC3h 50m
2026-07-16 UAL597 DEN → BOS Jul 16, 20:25 UTCJul 17, 00:20 UTC3h 55m
2026-07-16 UAL581 ORD → DEN Jul 16, 16:25 UTCJul 16, 18:36 UTC2h 11m
2026-07-16 UAL581 ORD → DEN Jul 16, 16:44 UTCJul 16, 18:40 UTC1h 55m
2026-07-16 UAL1377 - Jul 16, 12:09 UTCJul 16, 14:10 UTC2h 0m
2026-07-16 UAL2829 - Jul 16, 03:05 UTCJul 16, 05:00 UTC1h 55m
2026-07-15 UAL576 - Jul 15, 21:35 UTCJul 16, 01:05 UTC3h 30m
2026-07-15 UAL1755 - Jul 15, 16:40 UTCJul 15, 20:00 UTC3h 20m
2026-07-15 UAL1421 - Jul 15, 12:40 UTCJul 15, 15:10 UTC2h 30m
2026-07-15 UAL353 - Jul 15, 05:50 UTCJul 15, 09:35 UTC3h 45m
2026-07-15 UAL1262 - Jul 15, 02:05 UTCJul 15, 03:55 UTC1h 50m
2026-07-14 UAL1354 RSW → DEN Jul 14, 20:10 UTCJul 14, 23:30 UTC3h 19m
2026-07-14 UAL1102 ORD → RSW Jul 14, 15:50 UTCJul 14, 18:15 UTC2h 25m

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 N54525 page for operator, model, and routing details .

Mode-S A6ED3B frequently asked

What is Mode-S code A6ED3B?
A6ED3B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N54525.
Where is Mode-S A6ED3B registered?
Mode-S code A6ED3B 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 A6ED3B 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 A6ED3B, octal 51566473, decimal 10,939,707.
What flights does A6ED3B operate?
Mode-S A6ED3B has broadcast 20 distinct callsigns, including UAL321, UAL2835, UAL1583, UAL1941, UAL1495.