Apparatus

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sensors Mode-S transponder

A0B849

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14549 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A0B849
Octal
50134111
Decimal
10,532,937
Country
US
Tail
N14549
Type
A21N
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
402
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A0B849.

Country allocation

The ICAO 24-bit address A0B849 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
UAL800 - 8 2026-07-08
UAL2292 - 7 2026-07-12
UAL1568 United Airlines 7 2026-06-26
UAL1132 United Airlines 6 2026-05-17
UAL540 - 5 2026-06-20
UAL2845 - 5 2026-07-13
UAL2610 - 5 2026-07-12
UAL1232 - 5 2026-07-08
UAL534 - 4 2026-07-17
UAL2843 United Airlines 4 2026-07-24
UAL2794 - 4 2026-07-03
UAL2666 United Airlines 4 2026-07-24
UAL2132 United Airlines 4 2026-05-18
UAL2099 - 4 2026-07-07
UAL2088 United Airlines 4 2026-06-05
UAL1775 - 4 2026-06-24
UAL1755 - 4 2026-06-22
UAL8188 United Airlines 3 2026-04-14
UAL8156 - 3 2026-04-13
UAL714 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1779 MIA → EWR Jul 26, 21:20 UTCJul 26, 22:15 UTC55m
2026-07-26 UAL1940 IAD → ATL Jul 26, 17:30 UTCJul 26, 19:25 UTC1h 55m
2026-07-26 UAL1758 DEN → KOA Jul 26, 13:34 UTCJul 26, 15:25 UTC1h 51m
2026-07-26 UAL1758 DEN → KOA Jul 26, 13:25 UTCJul 26, 14:15 UTC50m
2026-07-26 UAL1007 ORD → ALB Jul 26, 00:25 UTCJul 26, 02:30 UTC2h 5m
2026-07-25 UAL577 IAD → DEN Jul 25, 17:40 UTCJul 25, 21:10 UTC3h 30m
2026-07-25 UAL2345 IAD → BDL Jul 25, 12:10 UTCJul 25, 15:20 UTC3h 10m
2026-07-25 UAL767 IAH → ANC Jul 25, 01:25 UTCJul 25, 03:25 UTC2h 0m
2026-07-24 UAL1023 DEN → TPA Jul 24, 21:20 UTCJul 24, 23:25 UTC2h 5m
2026-07-24 UAL2843 FRA → SFO Jul 24, 17:20 UTCJul 24, 19:15 UTC1h 55m
2026-07-24 UAL2843 FRA → SFO Jul 24, 17:33 UTCJul 24, 19:07 UTC1h 34m
2026-07-24 UAL2666 ORD → DEN Jul 24, 13:45 UTCJul 24, 15:45 UTC2h 0m
2026-07-24 UAL1066 MEX → EWR Jul 24, 04:10 UTCJul 24, 06:05 UTC1h 55m
2026-07-24 UAL1585 SFO → PVR Jul 24, 00:35 UTCJul 24, 02:35 UTC2h 0m
2026-07-24 UAL1585 SFO → PVR Jul 24, 00:17 UTCJul 24, 02:33 UTC2h 16m
2026-07-23 UAL1565 SFO → PHX Jul 23, 20:30 UTCJul 23, 22:55 UTC2h 25m
2026-07-23 UAL1565 SFO → PHX Jul 23, 19:58 UTCJul 23, 22:40 UTC2h 42m
2026-07-23 UAL660 EWR → CHS Jul 23, 14:16 UTCJul 23, 18:24 UTC4h 8m
2026-07-23 UAL660 EWR → CHS Jul 23, 14:55 UTCJul 23, 18:30 UTC3h 35m
2026-07-22 UAL706 LAX → ORD Jul 22, 22:20 UTCJul 23, 01:15 UTC2h 55m
2026-07-22 UAL2440 ORD → AUS Jul 22, 16:29 UTCJul 22, 19:30 UTC3h 1m
2026-07-22 UAL2440 ORD → AUS Jul 22, 16:10 UTCJul 22, 19:35 UTC3h 25m
2026-07-21 UAL2113 EWR → ATL Jul 21, 18:05 UTCJul 21, 21:35 UTC3h 30m
2026-07-21 UAL2361 SFO → IAH Jul 21, 12:45 UTCJul 21, 16:20 UTC3h 35m
2026-07-21 UAL2258 DEN → ORD Jul 21, 01:45 UTCJul 21, 03:40 UTC1h 55m
2026-07-20 UAL2297 EWR → LAS Jul 20, 19:15 UTCJul 20, 23:20 UTC4h 5m
2026-07-20 UAL558 HNL → SFO Jul 20, 13:50 UTCJul 20, 17:25 UTC3h 35m
2026-07-20 UAL2339 - Jul 20, 01:50 UTCJul 20, 03:40 UTC1h 50m
2026-07-19 UAL489 - Jul 19, 22:15 UTCJul 20, 00:15 UTC2h 0m
2026-07-19 UAL2455 EWR → ATL Jul 19, 17:05 UTCJul 19, 20:35 UTC3h 30m
2026-07-19 UAL1233 ORD → SFO Jul 19, 13:10 UTCJul 19, 14:35 UTC1h 25m
2026-07-18 UAL1233 ORD → SFO Jul 18, 21:15 UTCJul 19, 00:20 UTC3h 5m
2026-07-18 UAL1311 EWR → CLT Jul 18, 13:00 UTCJul 18, 16:30 UTC3h 30m
2026-07-18 UAL1374 DEN → ORF Jul 18, 00:29 UTCJul 18, 03:55 UTC3h 26m
2026-07-17 UAL1411 PDX → DEN Jul 17, 20:04 UTCJul 17, 22:15 UTC2h 10m
2026-07-17 UAL1994 - Jul 17, 15:10 UTCJul 17, 18:44 UTC3h 35m
2026-07-17 UAL530 - Jul 17, 10:20 UTCJul 17, 12:10 UTC1h 50m
2026-07-17 UAL534 ORD → EWR Jul 17, 00:40 UTCJul 17, 02:10 UTC1h 30m
2026-07-16 UAL1641 PDX → ORD Jul 16, 18:15 UTCJul 16, 22:19 UTC4h 5m
2026-07-16 UAL2300 - Jul 16, 12:55 UTCJul 16, 16:49 UTC3h 55m
2026-07-16 UAL212 - Jul 16, 00:15 UTCJul 16, 03:50 UTC3h 35m
2026-07-15 UAL1363 ORD → LAX Jul 15, 18:29 UTCJul 15, 21:50 UTC3h 21m
2026-07-15 UAL1363 - Jul 15, 18:20 UTCJul 15, 21:55 UTC3h 35m
2026-07-15 UAL2683 MCO → ORD Jul 15, 13:50 UTCJul 15, 16:15 UTC2h 25m
2026-07-15 UAL259 DEN → MCO Jul 15, 00:25 UTCJul 15, 03:45 UTC3h 20m
2026-07-14 UAL1323 LAS → DEN Jul 14, 20:45 UTCJul 14, 22:20 UTC1h 35m
2026-07-14 UAL526C DEN → LAS Jul 14, 17:40 UTCJul 14, 19:05 UTC1h 25m
2026-07-14 UAL792 IAD → DEN Jul 14, 12:25 UTCJul 14, 15:20 UTC2h 55m
2026-07-14 UAL1924 DEN → IAD Jul 14, 06:15 UTCJul 14, 09:20 UTC3h 5m
2026-07-14 UAL767 - Jul 14, 01:25 UTCJul 14, 03:10 UTC1h 45m

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 N14549 page for operator, model, and routing details .

Mode-S A0B849 frequently asked

What is Mode-S code A0B849?
A0B849 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14549.
Where is Mode-S A0B849 registered?
Mode-S code A0B849 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 A0B849 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0B849, octal 50134111, decimal 10,532,937.
What flights does A0B849 operate?
Mode-S A0B849 has broadcast 20 distinct callsigns, including UAL800, UAL2292, UAL1568, UAL1132, UAL540.