Apparatus

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sensors Mode-S transponder

A61592

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N491UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A61592
Octal
51412622
Decimal
10,884,498
Country
US
Tail
N491UA
Type
A320
No current signal · last broadcast Jul 26, 02:10 UTC
Flights observed
493
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 02:10 UTC

Last known position

Most recent position reported by Mode-S A61592.

Country allocation

The ICAO 24-bit address A61592 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
UAL303 - 7 2026-07-05
UAL1061 - 7 2026-07-05
UAL561 - 6 2026-06-27
UAL2299 United Airlines 5 2026-05-11
UAL2195 United Airlines 5 2026-05-11
UAL1935 United Airlines 5 2026-05-10
UAL1237 United Airlines 5 2026-05-11
UAL1180 United Airlines 5 2026-06-23
UAL636 - 4 2026-06-14
UAL578 United Airlines 4 2026-06-11
UAL2774 - 4 2026-07-02
UAL2483 - 4 2026-06-23
UAL247 United Airlines 4 2026-06-22
UAL224 - 4 2026-06-19
UAL215 United Airlines 4 2026-06-24
UAL2148 United Airlines 4 2026-05-08
UAL1712 United Airlines 4 2026-05-05
UAL1508 United Airlines 4 2026-07-23
UAL1483 - 4 2026-07-15
UAL1369 - 4 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL3890 NAS → EWR Jul 26, 00:25 UTCJul 26, 02:10 UTC1h 45m
2026-07-25 UAL1838 MEX → IAH Jul 25, 20:35 UTCJul 25, 22:25 UTC1h 50m
2026-07-25 UAL1088 IAH → MEX Jul 25, 17:15 UTCJul 25, 18:55 UTC1h 40m
2026-07-25 UAL2662 DEN → PDX Jul 25, 13:25 UTCJul 25, 15:05 UTC1h 40m
2026-07-25 UAL2662 DEN → PDX Jul 25, 13:15 UTCJul 25, 15:01 UTC1h 46m
2026-07-25 UAL1436 BOS → ORD Jul 25, 02:05 UTCJul 25, 03:05 UTC1h 0m
2026-07-24 UAL1741 MSY → EWR Jul 24, 23:40 UTCJul 25, 00:55 UTC1h 15m
2026-07-24 UAL1402 DEN → CVG Jul 24, 21:25 UTCJul 24, 22:13 UTC48m
2026-07-24 UAL1402 DEN → CVG Jul 24, 21:20 UTCJul 24, 22:15 UTC55m
2026-07-24 UAL1023 DEN → TPA Jul 24, 18:05 UTCJul 24, 20:00 UTC1h 55m
2026-07-24 UAL2149 DEN → SMF Jul 24, 14:15 UTCJul 24, 16:15 UTC2h 0m
2026-07-24 UAL355 BUR → SFO Jul 24, 11:20 UTCJul 24, 12:40 UTC1h 20m
2026-07-24 UAL1515 SNA → EWR Jul 24, 03:55 UTCJul 24, 06:45 UTC2h 50m
2026-07-23 UAL1508 IAD → EWR Jul 23, 03:20 UTCJul 23, 04:10 UTC50m
2026-07-22 UAL2764 IAD → EWR Jul 22, 23:30 UTCJul 23, 00:25 UTC55m
2026-07-22 UAL1482 SAT → SFO Jul 22, 17:50 UTCJul 22, 19:40 UTC1h 50m
2026-07-22 UAL1708 MCO → EWR Jul 22, 14:35 UTCJul 22, 16:00 UTC1h 25m
2026-07-22 UAL1508 IAD → EWR Jul 22, 02:45 UTCJul 22, 03:35 UTC50m
2026-07-21 UAL2764 IAD → EWR Jul 21, 23:41 UTCJul 22, 00:20 UTC39m
2026-07-21 UAL2764 IAD → EWR Jul 21, 23:30 UTCJul 22, 00:25 UTC55m
2026-07-21 UAL2305 RSW → ORD Jul 21, 21:20 UTCJul 21, 22:05 UTC45m
2026-07-21 UAL671 DEN → BZN Jul 21, 18:20 UTCJul 21, 20:15 UTC1h 55m
2026-07-21 UAL255 ATL → EWR Jul 21, 14:55 UTCJul 21, 16:55 UTC2h 0m
2026-07-21 UAL1204 DEN → ATW Jul 21, 01:50 UTCJul 21, 03:35 UTC1h 45m
2026-07-20 UAL400 AUS → IAD Jul 20, 20:20 UTCJul 20, 23:45 UTC3h 25m
2026-07-20 UAL400 AUS → IAD Jul 20, 20:26 UTCJul 20, 23:34 UTC3h 8m
2026-07-20 UAL2030 DEN → CUN Jul 20, 16:05 UTCJul 20, 18:50 UTC2h 45m
2026-07-20 UAL340 SFO → DEN Jul 20, 11:50 UTCJul 20, 14:20 UTC2h 30m
2026-07-20 UAL1305 EWR → RDU Jul 20, 00:25 UTCJul 20, 02:55 UTC2h 30m
2026-07-19 UAL514 AUS → EWR Jul 19, 20:35 UTCJul 19, 22:10 UTC1h 35m
2026-07-19 UAL476 SFO → ORD Jul 19, 17:35 UTCJul 19, 19:00 UTC1h 25m
2026-07-19 UAL2742 LAX → SFO Jul 19, 14:51 UTCJul 19, 15:56 UTC1h 5m
2026-07-19 UAL2742 LAX → SFO Jul 19, 14:50 UTCJul 19, 15:55 UTC1h 5m
2026-07-19 UAL645 LAX → EWR Jul 19, 00:25 UTCJul 19, 01:35 UTC1h 10m
2026-07-18 UAL514 AUS → EWR Jul 18, 21:30 UTCJul 18, 23:00 UTC1h 30m
2026-07-18 UAL514 AUS → EWR Jul 18, 20:26 UTCJul 18, 22:58 UTC2h 32m
2026-07-18 UAL476 DEN → CID Jul 18, 17:35 UTCJul 18, 19:10 UTC1h 35m
2026-07-18 UAL1610 ORD → LGA Jul 18, 14:25 UTCJul 18, 15:50 UTC1h 25m
2026-07-18 UAL1126 DEN → FAR Jul 18, 01:05 UTCJul 18, 02:29 UTC1h 25m
2026-07-17 UAL1866 - Jul 17, 20:44 UTCJul 17, 23:30 UTC2h 45m
2026-07-17 UAL1786 - Jul 17, 16:40 UTCJul 17, 19:25 UTC2h 45m
2026-07-17 UAL1846 - Jul 17, 12:15 UTCJul 17, 14:39 UTC2h 25m
2026-07-17 UAL1220 DEN → DTW Jul 17, 00:35 UTCJul 17, 02:50 UTC2h 15m
2026-07-16 UAL2447 AUS → DEN Jul 16, 20:01 UTCJul 16, 21:41 UTC1h 40m
2026-07-16 UAL2447 AUS → DEN Jul 16, 19:55 UTCJul 16, 21:45 UTC1h 50m
2026-07-16 UAL1026 DEN → AUS Jul 16, 16:30 UTCJul 16, 18:19 UTC1h 50m
2026-07-16 UAL2418 - Jul 16, 12:55 UTCJul 16, 14:25 UTC1h 30m
2026-07-16 UAL1762 DEN → TUS Jul 16, 01:30 UTCJul 16, 02:55 UTC1h 25m
2026-07-15 UAL447 - Jul 15, 20:45 UTCJul 15, 23:15 UTC2h 30m
2026-07-15 UAL1241 - Jul 15, 16:30 UTCJul 15, 18:55 UTC2h 25m

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 N491UA page for operator, model, and routing details .

Mode-S A61592 frequently asked

What is Mode-S code A61592?
A61592 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N491UA.
Where is Mode-S A61592 registered?
Mode-S code A61592 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 A61592 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 02:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61592, octal 51412622, decimal 10,884,498.
What flights does A61592 operate?
Mode-S A61592 has broadcast 20 distinct callsigns, including UAL303, UAL1061, UAL561, UAL2299, UAL2195.