Apparatus

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sensors Mode-S transponder

A5954E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N459UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A5954E
Octal
51312516
Decimal
10,851,662
Country
US
Tail
N459UA
Type
A320
No current signal · last broadcast Jul 26, 01:15 UTC
Flights observed
455
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 01:15 UTC

Last known position

Most recent position reported by Mode-S A5954E.

Country allocation

The ICAO 24-bit address A5954E 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
UAL348 - 5 2026-07-06
UAL2357 - 5 2026-06-23
UAL2200 United Airlines 5 2026-07-23
UAL739 United Airlines 4 2026-06-01
UAL609 - 4 2026-06-27
UAL578 United Airlines 4 2026-05-27
UAL399 United Airlines 4 2026-05-20
UAL2778 United Airlines 4 2026-06-17
UAL2671 United Airlines 4 2026-07-22
UAL2657 - 4 2026-07-02
UAL2656 - 4 2026-07-03
UAL2609 United Airlines 4 2026-04-25
UAL2225 - 4 2026-07-08
UAL1747 - 4 2026-07-13
UAL1297 United Airlines 4 2026-04-19
UAL1211 - 4 2026-06-16
UAL1184 United Airlines 4 2026-04-25
UAL1061 - 4 2026-06-23
UAL1007 United Airlines 4 2026-07-21
UAL670 United Airlines 3 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL2786 GEG → DEN Jul 25, 23:10 UTCJul 26, 01:05 UTC1h 55m
2026-07-25 UAL324 AUS → EWR Jul 25, 20:00 UTCJul 25, 21:55 UTC1h 55m
2026-07-25 UAL1944 ORD → PHX Jul 25, 15:00 UTCJul 25, 17:55 UTC2h 55m
2026-07-24 UAL1094 DEN → YYZ Jul 24, 22:30 UTCJul 25, 01:10 UTC2h 40m
2026-07-24 UAL2193 ATL → EWR Jul 24, 17:40 UTCJul 24, 21:05 UTC3h 25m
2026-07-24 UAL2742 LAX → SFO Jul 24, 14:55 UTCJul 24, 16:10 UTC1h 15m
2026-07-24 UAL645 LAX → EWR Jul 24, 01:00 UTCJul 24, 02:05 UTC1h 5m
2026-07-23 UAL447 SFO → SEA Jul 23, 20:55 UTCJul 23, 23:30 UTC2h 35m
2026-07-23 UAL1241 DEN → CLE Jul 23, 16:55 UTCJul 23, 19:15 UTC2h 20m
2026-07-23 UAL2200 EWR → SAN Jul 23, 00:20 UTCJul 23, 15:15 UTC14h 55m
2026-07-22 UAL1741 MSY → EWR Jul 22, 19:55 UTCJul 22, 21:10 UTC1h 15m
2026-07-22 UAL1402 DEN → CVG Jul 22, 17:40 UTCJul 22, 18:35 UTC55m
2026-07-22 UAL2383 PHL → DEN Jul 22, 13:05 UTCJul 22, 16:15 UTC3h 10m
2026-07-22 UAL2671 IAD → SAT Jul 22, 00:00 UTCJul 22, 03:05 UTC3h 5m
2026-07-21 UAL1007 ORD → ALB Jul 21, 18:55 UTCJul 21, 20:40 UTC1h 45m
2026-07-21 UAL2625 PHX → EWR Jul 21, 16:05 UTCJul 21, 17:50 UTC1h 45m
2026-07-21 UAL1978 - Jul 21, 14:05 UTCJul 21, 14:40 UTC35m
2026-07-21 UAL3925 DEN → JAC Jul 21, 03:42 UTCJul 21, 04:33 UTC51m
2026-07-21 UAL3925 - Jul 21, 03:35 UTCJul 21, 04:10 UTC35m
2026-07-21 UAL1717 PVR → ORD Jul 21, 02:00 UTCJul 21, 02:30 UTC30m
2026-07-21 UAL1717 PVR → ORD Jul 21, 00:57 UTCJul 21, 02:30 UTC1h 33m
2026-07-20 UAL2200 DEN → JAC Jul 20, 23:01 UTCJul 20, 23:54 UTC53m
2026-07-20 UAL2200 - Jul 20, 22:55 UTCJul 20, 23:30 UTC35m
2026-07-20 UAL1007 ORD → ALB Jul 20, 19:00 UTCJul 20, 20:45 UTC1h 45m
2026-07-20 UAL2625 PHX → EWR Jul 20, 16:05 UTCJul 20, 17:50 UTC1h 45m
2026-07-20 UAL2329 SBP → DEN Jul 20, 12:25 UTCJul 20, 14:40 UTC2h 15m
2026-07-20 UAL1237 DEN → SBP Jul 20, 01:25 UTCJul 20, 03:40 UTC2h 15m
2026-07-19 UAL2479 - Jul 19, 21:50 UTCJul 19, 23:40 UTC1h 50m
2026-07-19 UAL1819 - Jul 19, 19:50 UTCJul 19, 20:25 UTC35m
2026-07-19 UAL425 MCO → EWR Jul 19, 15:55 UTCJul 19, 17:25 UTC1h 30m
2026-07-19 UAL1030 SAT → EWR Jul 19, 12:40 UTCJul 19, 14:15 UTC1h 35m
2026-07-18 UAL2682 - Jul 18, 21:15 UTCJul 18, 21:55 UTC40m
2026-07-18 UAL1564 IAD → DFW Jul 18, 16:50 UTCJul 18, 19:30 UTC2h 40m
2026-07-18 UAL1434 - Jul 18, 13:35 UTCJul 18, 15:00 UTC1h 25m
2026-07-17 UAL293 EWR → DFW Jul 17, 22:20 UTCJul 17, 23:50 UTC1h 30m
2026-07-17 UAL358 DFW → IAD Jul 17, 17:50 UTCJul 17, 20:25 UTC2h 35m
2026-07-17 UAL358 DFW → IAD Jul 17, 17:40 UTCJul 17, 20:19 UTC2h 39m
2026-07-17 UAL528 - Jul 17, 14:10 UTCJul 17, 16:00 UTC1h 50m
2026-07-17 UAL1008 - Jul 17, 10:44 UTCJul 17, 12:15 UTC1h 30m
2026-07-17 UAL2481 - Jul 17, 01:15 UTCJul 17, 02:30 UTC1h 15m
2026-07-16 UAL2738 - Jul 16, 22:00 UTCJul 16, 23:20 UTC1h 20m
2026-07-16 UAL2765 - Jul 16, 18:19 UTCJul 16, 19:20 UTC1h 0m
2026-07-16 UAL2765 ORD → YYZ Jul 16, 18:24 UTCJul 16, 19:15 UTC51m
2026-07-16 UAL2201 DCA → ORD Jul 16, 14:50 UTCJul 16, 16:25 UTC1h 35m
2026-07-16 UAL1077 ORD → DCA Jul 16, 11:15 UTCJul 16, 12:40 UTC1h 25m
2026-07-15 UAL329 - Jul 15, 21:15 UTCJul 15, 23:20 UTC2h 5m
2026-07-15 UAL2418 DEN → BTV Jul 15, 16:15 UTCJul 15, 19:35 UTC3h 20m
2026-07-14 UAL439 AUS → DEN Jul 14, 23:35 UTCJul 15, 01:25 UTC1h 50m
2026-07-14 UAL1711 - Jul 14, 21:35 UTCJul 14, 22:05 UTC30m
2026-07-14 UAL2253 - Jul 14, 17:10 UTCJul 14, 18:05 UTC55m

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 N459UA page for operator, model, and routing details .

Mode-S A5954E frequently asked

What is Mode-S code A5954E?
A5954E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N459UA.
Where is Mode-S A5954E registered?
Mode-S code A5954E 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 A5954E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 01:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5954E, octal 51312516, decimal 10,851,662.
What flights does A5954E operate?
Mode-S A5954E has broadcast 20 distinct callsigns, including UAL348, UAL2357, UAL2200, UAL739, UAL609.