Apparatus

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sensors Mode-S transponder

A524E1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N430UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A524E1
Octal
51222341
Decimal
10,822,881
Country
US
Tail
N430UA
Type
A320
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
499
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A524E1.

Country allocation

The ICAO 24-bit address A524E1 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
UAL697 United Airlines 10 2026-06-14
UAL750 United Airlines 8 2026-04-20
UAL537 United Airlines 8 2026-04-20
UAL1508 United Airlines 7 2026-07-24
UAL2811 United Airlines 6 2026-07-22
UAL1640 United Airlines 6 2026-04-21
UAL513 - 5 2026-07-21
UAL335 United Airlines 5 2026-07-24
UAL255 United Airlines 5 2026-07-26
UAL2426 - 5 2026-07-08
UAL2082 United Airlines 5 2026-07-26
UAL1452 United Airlines 5 2026-04-26
UAL1204 United Airlines 5 2026-07-26
UAL1061 United Airlines 5 2026-05-23
UAL671 United Airlines 4 2026-07-23
UAL561 United Airlines 4 2026-06-04
UAL355 - 4 2026-07-03
UAL2831 - 4 2026-07-14
UAL2753 - 4 2026-07-11
UAL2479 - 4 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2262 LAS → SFO Jul 26, 21:20 UTCJul 26, 22:15 UTC55m
2026-07-26 UAL2082 MDT → ORD Jul 26, 17:45 UTCJul 26, 19:50 UTC2h 5m
2026-07-26 UAL255 ATL → EWR Jul 26, 14:10 UTCJul 26, 16:15 UTC2h 5m
2026-07-26 UAL1204 DEN → SJC Jul 26, 00:25 UTCJul 26, 02:15 UTC1h 50m
2026-07-26 UAL1204 DEN → SJC Jul 26, 00:15 UTCJul 26, 02:08 UTC1h 53m
2026-07-25 UAL1942 MSY → SFO Jul 25, 21:00 UTCJul 25, 23:00 UTC2h 0m
2026-07-25 UAL790 DEN → AUS Jul 25, 18:15 UTCJul 25, 19:15 UTC1h 0m
2026-07-25 UAL790 DEN → AUS Jul 25, 18:17 UTCJul 25, 19:12 UTC55m
2026-07-25 UAL336 SFO → EWR Jul 25, 15:05 UTCJul 25, 17:10 UTC2h 5m
2026-07-25 UAL8114 ORD → DCA Jul 25, 01:25 UTCJul 25, 02:45 UTC1h 20m
2026-07-25 UAL8114 ORD → DCA Jul 25, 01:34 UTCJul 25, 02:52 UTC1h 18m
2026-07-24 UAL454 BOS → EWR Jul 24, 20:45 UTCJul 25, 00:05 UTC3h 20m
2026-07-24 UAL1062 DEN → SFO Jul 24, 15:55 UTCJul 24, 19:07 UTC3h 12m
2026-07-24 UAL1062 DEN → SFO Jul 24, 16:00 UTCJul 24, 19:15 UTC3h 15m
2026-07-24 UAL335 DEN → IAD Jul 24, 13:10 UTCJul 24, 14:30 UTC1h 20m
2026-07-24 UAL335 DEN → IAD Jul 24, 13:13 UTCJul 24, 14:24 UTC1h 11m
2026-07-24 UAL1508 IAD → EWR Jul 24, 05:40 UTCJul 24, 06:45 UTC1h 5m
2026-07-24 UAL1508 IAD → EWR Jul 24, 05:43 UTCJul 24, 06:43 UTC1h 0m
2026-07-24 UAL1508 IAD → EWR Jul 24, 03:25 UTCJul 24, 04:15 UTC50m
2026-07-23 UAL2764 IAD → EWR Jul 23, 23:30 UTCJul 24, 00:20 UTC50m
2026-07-23 UAL2305 RSW → ORD Jul 23, 21:45 UTCJul 23, 22:35 UTC50m
2026-07-23 UAL671 DEN → BZN Jul 23, 17:45 UTCJul 23, 19:50 UTC2h 5m
2026-07-23 UAL255 ATL → EWR Jul 23, 14:05 UTCJul 23, 16:20 UTC2h 15m
2026-07-23 UAL255 ATL → EWR Jul 23, 13:45 UTCJul 23, 16:15 UTC2h 30m
2026-07-23 UAL1204 DEN → SJC Jul 23, 04:50 UTCJul 23, 07:05 UTC2h 15m
2026-07-23 UAL1204 DEN → SJC Jul 23, 04:43 UTCJul 23, 06:54 UTC2h 11m
2026-07-23 UAL2791 BWI → EWR Jul 23, 02:40 UTCJul 23, 03:10 UTC30m
2026-07-22 UAL2110 SAN → SFO Jul 22, 17:40 UTCJul 22, 19:15 UTC1h 35m
2026-07-22 UAL2811 CLE → SFO Jul 22, 02:05 UTCJul 22, 15:55 UTC13h 50m
2026-07-21 UAL1322 SFO → RNO Jul 21, 23:10 UTCJul 22, 00:15 UTC1h 5m
2026-07-21 UAL513 DEN → BZN Jul 21, 20:03 UTCJul 21, 21:08 UTC1h 5m
2026-07-21 UAL513 - Jul 21, 19:55 UTCJul 21, 20:35 UTC40m
2026-07-21 UAL1505 SEA → DEN Jul 21, 16:10 UTCJul 21, 18:25 UTC2h 15m
2026-07-21 UAL1482 SAT → SFO Jul 21, 12:30 UTCJul 21, 14:45 UTC2h 15m
2026-07-20 UAL1354 SAT → IAD Jul 20, 02:05 UTCJul 20, 13:40 UTC11h 35m
2026-07-19 UAL1322 SFO → RNO Jul 19, 23:45 UTCJul 20, 00:25 UTC40m
2026-07-19 UAL513 - Jul 19, 20:05 UTCJul 19, 20:45 UTC40m
2026-07-19 UAL513 DEN → BZN Jul 19, 20:03 UTCJul 19, 21:24 UTC1h 21m
2026-07-19 UAL2232 ORD → MSP Jul 19, 17:05 UTCJul 19, 18:35 UTC1h 30m
2026-07-19 UAL773 DEN → MSP Jul 19, 13:55 UTCJul 19, 15:30 UTC1h 35m
2026-07-19 UAL1442 - Jul 19, 11:10 UTCJul 19, 12:20 UTC1h 10m
2026-07-19 UAL1787 - Jul 19, 03:35 UTCJul 19, 04:40 UTC1h 5m
2026-07-18 UAL2246 RSW → EWR Jul 18, 20:15 UTCJul 19, 01:15 UTC5h 0m
2026-07-18 UAL1944 YYZ → DEN Jul 18, 15:10 UTCJul 18, 18:10 UTC3h 0m
2026-07-17 UAL1094 DEN → YYZ Jul 17, 23:48 UTCJul 18, 02:31 UTC2h 43m
2026-07-17 UAL1094 DEN → YYZ Jul 17, 23:45 UTCJul 18, 02:14 UTC2h 30m
2026-07-17 UAL1766 - Jul 17, 20:10 UTCJul 17, 22:25 UTC2h 15m
2026-07-17 UAL1766 BNA → DEN Jul 17, 20:05 UTCJul 17, 22:25 UTC2h 20m
2026-07-17 UAL1048 DEN → BNA Jul 17, 16:29 UTCJul 17, 18:44 UTC2h 15m
2026-07-17 UAL724 - Jul 17, 13:55 UTCJul 17, 15:10 UTC1h 15m

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 N430UA page for operator, model, and routing details .

Mode-S A524E1 frequently asked

What is Mode-S code A524E1?
A524E1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N430UA.
Where is Mode-S A524E1 registered?
Mode-S code A524E1 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 A524E1 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 A524E1, octal 51222341, decimal 10,822,881.
What flights does A524E1 operate?
Mode-S A524E1 has broadcast 20 distinct callsigns, including UAL697, UAL750, UAL537, UAL1508, UAL2811.