Apparatus

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sensors Mode-S transponder

A3D302

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N34551 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A3D302
Octal
50751402
Decimal
10,736,386
Country
US
Tail
N34551
Type
A21N
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
431
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A3D302.

Country allocation

The ICAO 24-bit address A3D302 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
UAL2494 - 9 2026-07-01
UAL2106 - 7 2026-07-11
UAL2430 United Airlines 6 2026-06-09
UAL597 - 5 2026-07-07
UAL540 United Airlines 5 2026-07-24
UAL1643 United Airlines 5 2026-05-09
UAL1023 - 5 2026-07-17
UAL800 United Airlines 4 2026-05-06
UAL2835 - 4 2026-07-15
UAL2803 United Airlines 4 2026-07-24
UAL2618 - 4 2026-06-14
UAL259 United Airlines 4 2026-07-25
UAL2481 United Airlines 4 2026-05-09
UAL2475 - 4 2026-07-20
UAL2179 United Airlines 4 2026-07-19
UAL1803 United Airlines 4 2026-05-30
UAL1779 - 4 2026-07-10
UAL1610 - 4 2026-06-17
UAL1583 United Airlines 4 2026-05-28
UAL1577 United Airlines 4 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2845 MCO → DEN Jul 26, 20:20 UTCJul 26, 22:30 UTC2h 10m
2026-07-26 UAL2292 EWR → DEN Jul 26, 14:25 UTCJul 26, 17:40 UTC3h 15m
2026-07-25 UAL2769 DEN → LAS Jul 25, 21:50 UTCJul 25, 23:50 UTC2h 0m
2026-07-25 UAL2865 DEN → ORD Jul 25, 17:50 UTCJul 25, 19:50 UTC2h 0m
2026-07-25 UAL1714 LAS → IAH Jul 25, 12:10 UTCJul 25, 15:30 UTC3h 20m
2026-07-25 UAL259 DEN → MCO Jul 25, 00:15 UTCJul 25, 03:25 UTC3h 10m
2026-07-24 UAL2803 DEN → SFO Jul 24, 20:05 UTCJul 24, 22:10 UTC2h 5m
2026-07-24 UAL2329 RNO → SFO Jul 24, 16:00 UTCJul 24, 18:15 UTC2h 15m
2026-07-24 UAL2806 BOG → EWR Jul 24, 11:15 UTCJul 24, 13:20 UTC2h 5m
2026-07-24 UAL1457 DEN → LGA Jul 24, 06:10 UTCJul 24, 09:35 UTC3h 25m
2026-07-24 UAL540 PDX → DEN Jul 24, 02:25 UTCJul 24, 04:20 UTC1h 55m
2026-07-23 UAL2758 IAD → EWR Jul 23, 21:45 UTCJul 23, 23:40 UTC1h 55m
2026-07-23 UAL2758 IAD → EWR Jul 23, 21:48 UTCJul 23, 23:44 UTC1h 56m
2026-07-23 UAL1013 DEN → LAX Jul 23, 18:10 UTCJul 23, 20:10 UTC2h 0m
2026-07-23 UAL792 LAX → EWR Jul 23, 12:30 UTCJul 23, 15:55 UTC3h 25m
2026-07-23 UAL2408 RSW → EWR Jul 23, 01:40 UTCJul 23, 04:30 UTC2h 50m
2026-07-22 UAL1351 FLL → EWR Jul 22, 21:50 UTCJul 23, 00:05 UTC2h 15m
2026-07-22 UAL1351 FLL → EWR Jul 22, 21:42 UTCJul 23, 00:06 UTC2h 24m
2026-07-22 UAL2099 IAH → SFO Jul 22, 15:55 UTCJul 22, 19:50 UTC3h 55m
2026-07-22 UAL2099 IAH → SFO Jul 22, 15:55 UTCJul 22, 19:45 UTC3h 50m
2026-07-22 UAL2800 - Jul 22, 11:45 UTCJul 22, 13:55 UTC2h 10m
2026-07-22 UAL2800 EWR → ORD Jul 22, 11:44 UTCJul 22, 13:40 UTC1h 56m
2026-07-22 UAL2610 IAD → PDX Jul 22, 01:55 UTCJul 22, 03:45 UTC1h 50m
2026-07-22 UAL2610 IAD → PDX Jul 22, 02:03 UTCJul 22, 03:46 UTC1h 43m
2026-07-21 UAL374 EWR → PBI Jul 21, 20:00 UTCJul 21, 23:40 UTC3h 40m
2026-07-21 UAL587 EWR → MSP Jul 21, 14:05 UTCJul 21, 17:50 UTC3h 45m
2026-07-20 UAL1107 ORD → SNA Jul 20, 22:15 UTCJul 21, 01:50 UTC3h 34m
2026-07-20 UAL2475 MCO → ORD Jul 20, 16:40 UTCJul 20, 19:25 UTC2h 45m
2026-07-20 UAL2280 - Jul 20, 12:45 UTCJul 20, 14:50 UTC2h 5m
2026-07-20 UAL368 EWR → FLL Jul 20, 07:15 UTCJul 20, 11:00 UTC3h 45m
2026-07-19 UAL2179 LGA → ORD Jul 19, 23:55 UTCJul 20, 03:50 UTC3h 55m
2026-07-19 UAL1641 IAD → SFO Jul 19, 18:20 UTCJul 19, 21:50 UTC3h 30m
2026-07-19 UAL2300 ORD → PDX Jul 19, 12:55 UTCJul 19, 16:50 UTC3h 55m
2026-07-18 UAL706 LAS → ORD Jul 18, 22:10 UTCJul 19, 01:20 UTC3h 10m
2026-07-18 UAL2440 ORD → AUS Jul 18, 17:25 UTCJul 18, 20:25 UTC3h 0m
2026-07-18 UAL1377 DEN → ORD Jul 18, 13:20 UTCJul 18, 15:30 UTC2h 10m
2026-07-18 UAL767 ORD → DEN Jul 18, 02:40 UTCJul 18, 04:30 UTC1h 51m
2026-07-17 UAL1023 DEN → ORD Jul 17, 22:49 UTCJul 18, 00:50 UTC2h 0m
2026-07-17 UAL2843 - Jul 17, 17:30 UTCJul 17, 19:25 UTC1h 55m
2026-07-17 UAL2666 DEN → SNA Jul 17, 14:00 UTCJul 17, 15:44 UTC1h 45m
2026-07-17 UAL1792 EWR → DEN Jul 17, 01:49 UTCJul 17, 05:10 UTC3h 20m
2026-07-16 UAL1505 DEN → EWR Jul 16, 19:55 UTCJul 16, 23:10 UTC3h 15m
2026-07-16 UAL2455 EWR → ATL Jul 16, 14:15 UTCJul 16, 17:40 UTC3h 25m
2026-07-16 UAL534 ORD → EWR Jul 16, 03:10 UTCJul 16, 04:35 UTC1h 25m
2026-07-15 UAL2835 - Jul 15, 21:40 UTCJul 15, 22:15 UTC35m
2026-07-15 UAL2835 SEA → ORD Jul 15, 18:12 UTCJul 15, 21:21 UTC3h 9m
2026-07-15 UAL2835 SEA → ORD Jul 15, 18:15 UTCJul 15, 22:15 UTC4h 0m
2026-07-15 UAL341 - Jul 15, 12:35 UTCJul 15, 16:20 UTC3h 45m
2026-07-14 UAL2487 - Jul 14, 21:40 UTCJul 15, 01:25 UTC3h 44m
2026-07-14 UAL2487 LAX → ORD Jul 14, 21:44 UTCJul 15, 01:07 UTC3h 23m

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 N34551 page for operator, model, and routing details .

Mode-S A3D302 frequently asked

What is Mode-S code A3D302?
A3D302 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N34551.
Where is Mode-S A3D302 registered?
Mode-S code A3D302 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 A3D302 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3D302, octal 50751402, decimal 10,736,386.
What flights does A3D302 operate?
Mode-S A3D302 has broadcast 20 distinct callsigns, including UAL2494, UAL2106, UAL2430, UAL597, UAL540.