Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A0B803

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14529 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A0B803
Octal
50134003
Decimal
10,532,867
Country
US
Tail
N14529
Type
A21N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
410
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A0B803.

Country allocation

The ICAO 24-bit address A0B803 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
UAL2865 - 10 2026-07-15
UAL1812 - 7 2026-07-11
UAL662 - 6 2026-07-13
UAL2613 - 6 2026-07-17
UAL1565 United Airlines 6 2026-06-16
UAL1132 United Airlines 6 2026-07-26
UAL1119 United Airlines 6 2026-07-26
UAL660 - 5 2026-06-16
UAL360 - 5 2026-07-16
UAL2123 - 5 2026-07-14
UAL2033 United Airlines 5 2026-05-16
UAL1755 United Airlines 5 2026-07-24
UAL1482 - 5 2026-07-11
UAL597 - 4 2026-06-11
UAL2843 United Airlines 4 2026-07-21
UAL2769 United Airlines 4 2026-07-24
UAL2616 United Airlines 4 2026-06-11
UAL2258 United Airlines 4 2026-07-24
UAL2132 - 4 2026-06-14
UAL2099 - 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1132 ORD → PHL Jul 26, 19:45 UTCJul 26, 22:45 UTC3h 0m
2026-07-26 UAL1119 DEN → CUN Jul 26, 14:25 UTCJul 26, 18:10 UTC3h 45m
2026-07-25 UAL1770 EWR → SAV Jul 25, 21:40 UTCJul 26, 00:50 UTC3h 10m
2026-07-25 UAL1770 EWR → SAV Jul 25, 21:32 UTCJul 26, 00:51 UTC3h 19m
2026-07-25 UAL2354 BUR → SFO Jul 25, 16:40 UTCJul 25, 19:50 UTC3h 10m
2026-07-25 UAL2643 DEN → BOS Jul 25, 11:45 UTCJul 25, 13:40 UTC1h 55m
2026-07-25 UAL475 EWR → MCO Jul 25, 02:15 UTCJul 25, 04:05 UTC1h 50m
2026-07-24 UAL2769 DEN → LAS Jul 24, 21:35 UTCJul 24, 23:40 UTC2h 5m
2026-07-24 UAL1755 EWR → IAH Jul 24, 19:25 UTCJul 24, 19:35 UTC10m
2026-07-24 UAL1755 EWR → IAH Jul 24, 16:40 UTCJul 24, 19:35 UTC2h 55m
2026-07-24 UAL1755 EWR → IAH Jul 24, 16:44 UTCJul 24, 19:08 UTC2h 24m
2026-07-24 UAL1421 IAH → BWI Jul 24, 12:30 UTCJul 24, 15:05 UTC2h 35m
2026-07-24 UAL2258 DEN → BWI Jul 24, 01:30 UTCJul 24, 03:25 UTC1h 55m
2026-07-23 UAL1132 ORD → PHL Jul 23, 19:30 UTCJul 23, 23:35 UTC4h 5m
2026-07-23 UAL1119 DEN → CUN Jul 23, 14:05 UTCJul 23, 17:45 UTC3h 40m
2026-07-23 UAL407 DTW → ORD Jul 23, 01:15 UTCJul 23, 05:15 UTC4h 0m
2026-07-23 UAL407 DTW → ORD Jul 23, 01:13 UTCJul 23, 04:59 UTC3h 46m
2026-07-22 UAL1233 ORD → SFO Jul 22, 17:50 UTCJul 22, 20:50 UTC3h 0m
2026-07-22 UAL792 LAX → EWR Jul 22, 12:25 UTCJul 22, 15:45 UTC3h 20m
2026-07-22 UAL767 IAH → ANC Jul 22, 01:35 UTCJul 22, 03:40 UTC2h 5m
2026-07-21 UAL1023 DEN → TPA Jul 21, 21:15 UTCJul 21, 23:25 UTC2h 10m
2026-07-21 UAL2843 FRA → SFO Jul 21, 17:30 UTCJul 21, 19:30 UTC2h 0m
2026-07-21 UAL2666 ORD → DEN Jul 21, 13:50 UTCJul 21, 15:40 UTC1h 50m
2026-07-20 UAL407 DTW → ORD Jul 20, 23:20 UTCJul 21, 03:00 UTC3h 39m
2026-07-20 UAL2329 ORD → EWR Jul 20, 20:05 UTCJul 20, 21:45 UTC1h 40m
2026-07-20 UAL587 EWR → MSP Jul 20, 14:15 UTCJul 20, 18:00 UTC3h 45m
2026-07-19 UAL1107 - Jul 19, 22:00 UTCJul 20, 01:30 UTC3h 30m
2026-07-19 UAL1568 ORD → SFO Jul 19, 16:00 UTCJul 19, 19:35 UTC3h 35m
2026-07-19 UAL1007 ORD → ALB Jul 19, 00:30 UTCJul 19, 02:35 UTC2h 5m
2026-07-18 UAL2843 - Jul 18, 17:30 UTCJul 18, 19:30 UTC2h 0m
2026-07-18 UAL2843 SNA → DEN Jul 18, 17:33 UTCJul 18, 19:26 UTC1h 53m
2026-07-18 UAL2666 ORD → DEN Jul 18, 13:50 UTCJul 18, 15:40 UTC1h 50m
2026-07-18 UAL1792 IAH → EWR Jul 18, 01:27 UTCJul 18, 05:16 UTC3h 49m
2026-07-18 UAL1792 IAH → EWR Jul 18, 01:45 UTCJul 18, 05:20 UTC3h 36m
2026-07-17 UAL1505 DEN → EWR Jul 17, 20:04 UTCJul 17, 23:30 UTC3h 25m
2026-07-17 UAL2455 EWR → ATL Jul 17, 14:30 UTCJul 17, 17:55 UTC3h 25m
2026-07-17 UAL2613 DEN → EWR Jul 17, 00:40 UTCJul 17, 03:55 UTC3h 15m
2026-07-16 UAL360 DFW → EWR Jul 16, 20:15 UTCJul 16, 22:35 UTC2h 20m
2026-07-16 UAL405 - Jul 16, 16:25 UTCJul 16, 18:10 UTC1h 45m
2026-07-16 UAL2601 SEA → DEN Jul 16, 12:25 UTCJul 16, 14:35 UTC2h 10m
2026-07-16 UAL360 DEN → SEA Jul 16, 01:45 UTCJul 16, 04:17 UTC2h 32m
2026-07-16 UAL360 - Jul 16, 01:50 UTCJul 16, 02:45 UTC55m
2026-07-15 UAL2769 ORD → DEN Jul 15, 22:20 UTCJul 16, 00:10 UTC1h 50m
2026-07-15 UAL2865 - Jul 15, 19:45 UTCJul 15, 20:05 UTC20m
2026-07-15 UAL2865 DEN → ORD Jul 15, 17:42 UTCJul 15, 19:26 UTC1h 44m
2026-07-15 UAL2865 DEN → ORD Jul 15, 17:40 UTCJul 15, 20:05 UTC2h 25m
2026-07-14 UAL2769 ORD → DEN Jul 14, 22:15 UTCJul 15, 00:05 UTC1h 49m
2026-07-14 UAL2865 ORD → TPA Jul 14, 17:37 UTCJul 14, 19:22 UTC1h 45m
2026-07-14 UAL2865 DEN → ORD Jul 14, 17:40 UTCJul 14, 19:50 UTC2h 10m
2026-07-14 UAL1758 SFO → DEN Jul 14, 13:34 UTCJul 14, 15:58 UTC2h 24m

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 N14529 page for operator, model, and routing details .

Mode-S A0B803 frequently asked

What is Mode-S code A0B803?
A0B803 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14529.
Where is Mode-S A0B803 registered?
Mode-S code A0B803 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 A0B803 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 A0B803, octal 50134003, decimal 10,532,867.
What flights does A0B803 operate?
Mode-S A0B803 has broadcast 20 distinct callsigns, including UAL2865, UAL1812, UAL662, UAL2613, UAL1565.