Apparatus

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sensors Mode-S transponder

A0B841

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14541 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A0B841
Octal
50134101
Decimal
10,532,929
Country
US
Tail
N14541
Type
A21N
Broadcasting now · callsign UAL2475 · 19,000 ft
Flights observed
447
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Current position

A0B841 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0B841 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
UAL1996 United Airlines 14 2026-06-17
UAL2088 - 10 2026-06-17
UAL2091 - 8 2026-06-29
UAL714 - 7 2026-07-19
UAL695 - 7 2026-06-20
UAL2089 - 7 2026-06-20
UAL495 - 6 2026-07-06
UAL2106 United Airlines 6 2026-07-23
UAL1119 - 6 2026-06-25
UAL1013 - 6 2026-07-11
UAL2618 United Airlines 5 2026-07-24
UAL2262 United Airlines 5 2026-04-24
UAL1740 United Airlines 5 2026-05-14
UAL1720 - 5 2026-07-16
UAL787 United Airlines 4 2026-07-20
UAL489 - 4 2026-07-16
UAL2758 - 4 2026-07-12
UAL2666 - 4 2026-07-12
UAL2481 - 4 2026-07-14
UAL2354 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL777 RSW → EWR Jul 26, 18:15 UTCJul 26, 21:40 UTC3h 25m
2026-07-26 UAL2315 BOS → ORD Jul 26, 14:00 UTCJul 26, 16:25 UTC2h 25m
2026-07-25 UAL2297 EWR → LAS Jul 25, 19:35 UTCJul 25, 23:35 UTC4h 0m
2026-07-25 UAL558 HNL → SFO Jul 25, 14:00 UTCJul 25, 17:25 UTC3h 25m
2026-07-25 UAL2610 IAD → PDX Jul 25, 01:45 UTCJul 25, 03:40 UTC1h 55m
2026-07-24 UAL374 EWR → PBI Jul 24, 19:55 UTCJul 24, 23:35 UTC3h 40m
2026-07-24 UAL2618 IAD → SFO Jul 24, 14:15 UTCJul 24, 17:30 UTC3h 15m
2026-07-24 UAL2618 IAD → SFO Jul 24, 14:18 UTCJul 24, 17:14 UTC2h 56m
2026-07-23 UAL1801 BUR → SFO Jul 23, 21:55 UTCJul 24, 01:50 UTC3h 55m
2026-07-23 UAL1568 ORD → SFO Jul 23, 15:40 UTCJul 23, 19:25 UTC3h 45m
2026-07-23 UAL2106 IAH → EWR Jul 23, 03:10 UTCJul 23, 07:15 UTC4h 5m
2026-07-22 UAL1779 MIA → EWR Jul 22, 21:15 UTCJul 23, 00:50 UTC3h 35m
2026-07-22 UAL1940 IAD → ATL Jul 22, 17:55 UTCJul 22, 20:00 UTC2h 5m
2026-07-22 UAL2154 ORD → TPA Jul 22, 12:05 UTCJul 22, 16:10 UTC4h 5m
2026-07-22 UAL2033 RNO → SFO Jul 22, 03:25 UTCJul 22, 05:25 UTC2h 0m
2026-07-21 UAL662 EWR → DFW Jul 21, 14:20 UTCJul 21, 18:55 UTC4h 35m
2026-07-21 UAL2331 ORD → BOS Jul 21, 00:45 UTCJul 21, 02:30 UTC1h 45m
2026-07-20 UAL2835 SEA → ORD Jul 20, 18:25 UTCJul 20, 22:25 UTC4h 0m
2026-07-20 UAL341 EWR → BOS Jul 20, 12:30 UTCJul 20, 16:25 UTC3h 55m
2026-07-20 UAL787 SJC → IAH Jul 20, 02:00 UTCJul 20, 04:00 UTC2h 0m
2026-07-19 UAL714 - Jul 19, 21:25 UTCJul 19, 23:45 UTC2h 20m
2026-07-19 UAL2475 MCO → ORD Jul 19, 16:40 UTCJul 19, 19:10 UTC2h 30m
2026-07-19 UAL2280 - Jul 19, 12:50 UTCJul 19, 15:00 UTC2h 10m
2026-07-19 UAL2280 ORD → MCO Jul 19, 12:53 UTCJul 19, 14:53 UTC2h 0m
2026-07-19 UAL368 EWR → FLL Jul 19, 07:00 UTCJul 19, 10:35 UTC3h 35m
2026-07-18 UAL2179 LGA → ORD Jul 18, 23:55 UTCJul 19, 03:50 UTC3h 55m
2026-07-18 UAL1641 IAD → SFO Jul 18, 18:00 UTCJul 18, 21:20 UTC3h 20m
2026-07-18 UAL2300 ORD → PDX Jul 18, 13:18 UTCJul 18, 16:48 UTC3h 30m
2026-07-18 UAL2300 - Jul 18, 13:05 UTCJul 18, 16:50 UTC3h 45m
2026-07-18 UAL2085 EWR → AUS Jul 18, 02:05 UTCJul 18, 04:05 UTC2h 1m
2026-07-17 UAL1354 RSW → DEN Jul 17, 20:35 UTCJul 18, 00:00 UTC3h 25m
2026-07-17 UAL1102 - Jul 17, 16:10 UTCJul 17, 18:50 UTC2h 40m
2026-07-17 UAL2800 - Jul 17, 11:25 UTCJul 17, 13:15 UTC1h 50m
2026-07-17 UAL1745 SFO → IAH Jul 17, 06:15 UTCJul 17, 09:25 UTC3h 10m
2026-07-17 UAL2339 - Jul 17, 01:59 UTCJul 17, 03:50 UTC1h 50m
2026-07-16 UAL489 - Jul 16, 21:55 UTCJul 17, 00:20 UTC2h 25m
2026-07-16 UAL2168 - Jul 16, 17:54 UTCJul 16, 19:50 UTC1h 55m
2026-07-16 UAL1720 - Jul 16, 13:54 UTCJul 16, 15:55 UTC2h 0m
2026-07-15 UAL2834 LGA → DEN Jul 15, 22:55 UTCJul 16, 02:20 UTC3h 25m
2026-07-15 UAL2446 - Jul 15, 16:10 UTCJul 15, 19:35 UTC3h 25m
2026-07-15 UAL1479 SFO → DEN Jul 15, 12:05 UTCJul 15, 14:10 UTC2h 5m
2026-07-14 UAL511T ORD → SFO Jul 14, 23:28 UTCJul 15, 03:15 UTC3h 47m
2026-07-14 UAL511T ORD → SFO Jul 14, 23:25 UTCJul 15, 03:25 UTC4h 0m
2026-07-14 UAL2481 MCO → ORD Jul 14, 18:35 UTCJul 14, 20:55 UTC2h 20m
2026-07-14 UAL1643 - Jul 14, 14:35 UTCJul 14, 16:45 UTC2h 10m
2026-07-14 UAL1414 BOS → ORD Jul 14, 10:17 UTCJul 14, 12:03 UTC1h 46m
2026-07-14 UAL1414 - Jul 14, 10:05 UTCJul 14, 12:00 UTC1h 55m
2026-07-14 UAL1779 ORD → BOS Jul 14, 03:25 UTCJul 14, 05:15 UTC1h 50m
2026-07-14 UAL1779 ORD → BOS Jul 14, 03:14 UTCJul 14, 05:13 UTC1h 59m
2026-07-13 UAL2487 - Jul 13, 21:40 UTCJul 14, 01:20 UTC3h 40m

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 N14541 page for operator, model, and routing details .

Mode-S A0B841 frequently asked

What is Mode-S code A0B841?
A0B841 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14541.
Where is Mode-S A0B841 registered?
Mode-S code A0B841 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 A0B841 broadcasting right now?
Yes. Mode-S A0B841 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0B841, octal 50134101, decimal 10,532,929.
What flights does A0B841 operate?
Mode-S A0B841 has broadcast 20 distinct callsigns, including UAL1996, UAL2088, UAL2091, UAL714, UAL695.