Apparatus

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sensors Mode-S transponder

A0A903

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14118 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A0A903
Octal
50124403
Decimal
10,529,027
Country
US
Tail
N14118
Type
B752
No current signal · last broadcast Jul 26, 18:50 UTC
Flights observed
282
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:50 UTC

Last known position

Most recent position reported by Mode-S A0A903.

Country allocation

The ICAO 24-bit address A0A903 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
UAL2191 United Airlines 10 2026-07-23
UAL271 United Airlines 8 2026-06-29
UAL270 - 8 2026-06-29
UAL1981 United Airlines 7 2026-05-18
UAL2115 - 6 2026-07-14
UAL1095 - 6 2026-07-09
UAL634 United Airlines 5 2026-06-26
UAL37 United Airlines 5 2026-06-09
UAL36 United Airlines 5 2026-06-09
UAL336 - 5 2026-07-08
UAL332 United Airlines 5 2026-05-08
UAL310 United Airlines 5 2026-06-13
UAL2743 United Airlines 5 2026-05-03
UAL2445 United Airlines 5 2026-05-24
UAL2359 United Airlines 5 2026-05-06
UAL2080 - 5 2026-07-16
UAL1626 United Airlines 5 2026-04-26
UAL1597 - 5 2026-07-09
UAL145 United Airlines 5 2026-07-26
UAL1340 United Airlines 5 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL145 OPO → EWR Jul 26, 12:00 UTCJul 26, 18:40 UTC6h 40m
2026-07-26 UAL145 OPO → EWR Jul 26, 11:45 UTCJul 26, 12:20 UTC35m
2026-07-26 UAL144 EWR → OPO Jul 26, 02:10 UTCJul 26, 08:50 UTC6h 41m
2026-07-25 UAL316 DUB → EWR Jul 25, 12:56 UTCJul 25, 19:41 UTC6h 45m
2026-07-25 UAL316 DUB → EWR Jul 25, 12:50 UTCJul 25, 19:45 UTC6h 55m
2026-07-25 UAL317 IAH → PHL Jul 25, 03:35 UTCJul 25, 09:35 UTC6h 0m
2026-07-25 UAL317 IAH → PHL Jul 25, 03:25 UTCJul 25, 03:30 UTC5m
2026-07-24 UAL2227 MFR → SFO Jul 24, 19:30 UTCJul 25, 00:20 UTC4h 50m
2026-07-23 UAL2191 EUG → SFO Jul 23, 18:45 UTCJul 23, 23:55 UTC5h 10m
2026-07-23 UAL2191 EUG → SFO Jul 23, 18:38 UTCJul 23, 23:46 UTC5h 8m
2026-07-23 UAL239 ORD → BNA Jul 23, 08:25 UTCJul 23, 15:25 UTC7h 0m
2026-07-22 UAL238 CLE → ORD Jul 22, 23:30 UTCJul 23, 05:50 UTC6h 20m
2026-07-22 UAL139 EWR → KEF Jul 22, 11:50 UTCJul 22, 17:55 UTC6h 5m
2026-07-22 UAL138 KEF → EWR Jul 22, 01:55 UTCJul 22, 03:35 UTC1h 40m
2026-07-21 UAL351 DCA → SFO Jul 21, 08:05 UTCJul 21, 16:00 UTC7h 55m
2026-07-20 UAL350 EWR → AGP Jul 20, 23:20 UTCJul 21, 06:23 UTC7h 3m
2026-07-20 UAL350 - Jul 20, 23:30 UTCJul 21, 00:45 UTC1h 14m
2026-07-20 UAL145 OPO → EWR Jul 20, 12:00 UTCJul 20, 19:05 UTC7h 5m
2026-07-20 UAL144 EWR → OPO Jul 20, 03:30 UTCJul 20, 09:50 UTC6h 20m
2026-07-19 UAL2127 - Jul 19, 17:35 UTCJul 19, 22:30 UTC4h 55m
2026-07-19 UAL2434 - Jul 19, 10:20 UTCJul 19, 15:15 UTC4h 55m
2026-07-18 UAL274 RDU → EWR Jul 18, 23:20 UTCJul 19, 04:05 UTC4h 45m
2026-07-18 UAL274 RDU → EWR Jul 18, 21:48 UTCJul 19, 04:02 UTC6h 14m
2026-07-17 UAL648 - Jul 17, 15:35 UTCJul 17, 20:50 UTC5h 15m
2026-07-17 UAL648 EWR → SFO Jul 17, 15:27 UTCJul 17, 20:46 UTC5h 19m
2026-07-17 UAL698 SFO → EWR Jul 17, 04:59 UTCJul 17, 09:50 UTC4h 50m
2026-07-16 UAL2080 EWR → SFO Jul 16, 21:30 UTCJul 17, 02:45 UTC5h 15m
2026-07-16 UAL2080 EWR → EWR Jul 16, 21:15 UTCJul 16, 21:19 UTC5m
2026-07-16 UAL2301 ORD → EWR Jul 16, 18:25 UTCJul 16, 19:50 UTC1h 25m
2026-07-16 UAL289 - Jul 16, 08:50 UTCJul 16, 16:15 UTC7h 25m
2026-07-16 UAL289 SNN → ORD Jul 16, 08:47 UTCJul 16, 16:10 UTC7h 23m
2026-07-15 UAL288 ORD → SNN Jul 15, 23:57 UTCJul 16, 06:31 UTC6h 34m
2026-07-15 UAL288 - Jul 15, 23:55 UTCJul 16, 01:45 UTC1h 50m
2026-07-15 UAL2788 EWR → ORD Jul 15, 19:00 UTCJul 15, 20:50 UTC1h 50m
2026-07-14 UAL274 SFO → EWR Jul 14, 18:40 UTCJul 14, 23:45 UTC5h 4m
2026-07-14 UAL2115 - Jul 14, 10:25 UTCJul 14, 15:30 UTC5h 5m
2026-07-13 UAL2626 SFO → EWR Jul 13, 23:40 UTCJul 14, 04:45 UTC5h 5m
2026-07-13 UAL1343 - Jul 13, 16:45 UTCJul 13, 21:55 UTC5h 10m
2026-07-09 UAL1597 SFO → EWR Jul 9, 22:15 UTCJul 10, 03:00 UTC4h 45m
2026-07-09 UAL1095 - Jul 9, 12:25 UTCJul 9, 17:30 UTC5h 5m
2026-07-08 UAL336 SFO → IAD Jul 8, 18:20 UTCJul 8, 22:50 UTC4h 30m
2026-07-08 UAL2115 - Jul 8, 10:20 UTCJul 8, 15:45 UTC5h 25m
2026-07-07 UAL316 DUB → EWR Jul 7, 14:11 UTCJul 7, 20:50 UTC6h 39m
2026-07-07 UAL317 EWR → DUB Jul 7, 06:00 UTCJul 7, 11:55 UTC5h 55m
2026-07-06 UAL1700 - Jul 6, 23:35 UTCJul 7, 04:15 UTC4h 40m
2026-07-06 UAL2679 DEN → ORD Jul 6, 16:50 UTCJul 6, 21:45 UTC4h 55m
2026-07-06 UAL887 - Jul 6, 05:45 UTCJul 6, 13:20 UTC7h 35m
2026-07-06 UAL887 LIM → EWR Jul 6, 05:28 UTCJul 6, 13:07 UTC7h 39m
2026-07-05 UAL886 EWR → LIM Jul 5, 20:00 UTCJul 5, 23:55 UTC3h 55m
2026-07-05 UAL886 EWR → LIM Jul 5, 19:53 UTCJul 6, 03:14 UTC7h 21m

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 N14118 page for operator, model, and routing details .

Mode-S A0A903 frequently asked

What is Mode-S code A0A903?
A0A903 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14118.
Where is Mode-S A0A903 registered?
Mode-S code A0A903 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 A0A903 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A903, octal 50124403, decimal 10,529,027.
What flights does A0A903 operate?
Mode-S A0A903 has broadcast 20 distinct callsigns, including UAL2191, UAL271, UAL270, UAL1981, UAL2115.