Apparatus

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sensors Mode-S transponder

AAA593

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N78509 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AAA593
Octal
52522623
Decimal
11,183,507
Country
US
Tail
N78509
Type
B738
Broadcasting now · callsign UAL2275 · 37,000 ft
Flights observed
441
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AAA593 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AAA593 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
UAL1911 - 8 2026-06-25
UAL275 - 6 2026-06-25
UAL294 United Airlines 5 2026-06-05
UAL728 United Airlines 4 2026-05-06
UAL644 United Airlines 4 2026-06-10
UAL2605 United Airlines 4 2026-06-30
UAL2152 United Airlines 4 2026-06-05
UAL1501 - 4 2026-06-21
UAL1098 - 4 2026-06-29
UAL8180 United Airlines 3 2026-06-04
UAL745 United Airlines 3 2026-05-27
UAL475 United Airlines 3 2026-06-08
UAL361 United Airlines 3 2026-06-06
UAL341 United Airlines 3 2026-04-13
UAL2639 United Airlines 3 2026-05-03
UAL2446 - 3 2026-07-08
UAL1867 - 3 2026-07-01
UAL1843 United Airlines 3 2026-04-16
UAL1787 United Airlines 3 2026-06-11
UAL1677 United Airlines 3 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL2275 - Jul 14, 21:10 UTCJul 14, 22:45 UTC1h 34m
2026-07-14 UAL2459 DEN → YYC Jul 14, 17:50 UTCJul 14, 19:45 UTC1h 55m
2026-07-14 UAL2270 - Jul 14, 12:10 UTCJul 14, 15:10 UTC3h 0m
2026-07-14 UAL680 DEN → ORF Jul 14, 00:30 UTCJul 14, 03:45 UTC3h 15m
2026-07-13 UAL1534 - Jul 13, 20:55 UTCJul 13, 22:40 UTC1h 45m
2026-07-13 UAL2167 - Jul 13, 17:30 UTCJul 13, 18:45 UTC1h 15m
2026-07-13 UAL2045 HWO → DEN Jul 13, 11:50 UTCJul 13, 15:25 UTC3h 35m
2026-07-12 UAL1741 - Jul 12, 22:20 UTCJul 13, 01:55 UTC3h 35m
2026-07-12 UAL1396 - Jul 12, 20:25 UTCJul 12, 21:10 UTC45m
2026-07-12 UAL1217 - Jul 12, 17:40 UTCJul 12, 18:05 UTC25m
2026-07-12 UAL2648 GRR → DEN Jul 12, 12:50 UTCJul 12, 15:01 UTC2h 10m
2026-07-12 UAL2121 DEN → GRR Jul 12, 00:18 UTCJul 12, 02:13 UTC1h 55m
2026-07-12 UAL2121 DEN → GRR Jul 12, 00:10 UTCJul 12, 02:15 UTC2h 5m
2026-07-11 UAL2821 - Jul 11, 19:45 UTCJul 11, 22:01 UTC2h 15m
2026-07-11 UAL1522 DEN → IND Jul 11, 16:20 UTCJul 11, 18:30 UTC2h 10m
2026-07-11 UAL2754 - Jul 11, 12:10 UTCJul 11, 14:10 UTC2h 0m
2026-07-11 UAL1371 - Jul 11, 02:30 UTCJul 11, 04:45 UTC2h 15m
2026-07-11 UAL1371 DEN → MRY Jul 11, 01:58 UTCJul 11, 04:42 UTC2h 44m
2026-07-10 UAL1001 - Jul 10, 20:35 UTCJul 10, 23:40 UTC3h 5m
2026-07-10 UAL2185 DEN → PNS Jul 10, 16:50 UTCJul 10, 19:15 UTC2h 25m
2026-07-10 UAL2865 SBA → DEN Jul 10, 13:30 UTCJul 10, 15:20 UTC1h 50m
2026-07-10 UAL2479 DEN → SBA Jul 10, 02:45 UTCJul 10, 04:50 UTC2h 5m
2026-07-09 UAL2239 - Jul 9, 19:50 UTCJul 10, 00:15 UTC4h 25m
2026-07-09 UAL2195 - Jul 9, 16:30 UTCJul 9, 18:10 UTC1h 40m
2026-07-09 UAL2195 ORD → BDL Jul 9, 16:32 UTCJul 9, 18:05 UTC1h 33m
2026-07-09 UAL623 - Jul 9, 12:30 UTCJul 9, 14:15 UTC1h 45m
2026-07-08 UAL1623 ORD → LGA Jul 8, 23:55 UTCJul 9, 01:35 UTC1h 40m
2026-07-08 UAL2160 PHX → SFO Jul 8, 19:30 UTCJul 8, 21:30 UTC2h 0m
2026-07-08 UAL441 EWR → FLL Jul 8, 16:10 UTCJul 8, 17:55 UTC1h 45m
2026-07-08 UAL2446 LGA → ORD Jul 8, 02:15 UTCJul 8, 04:05 UTC1h 50m
2026-07-07 UAL1617 ORD → LGA Jul 7, 22:45 UTCJul 8, 00:55 UTC2h 10m
2026-07-07 UAL1617 ORD → LGA Jul 7, 22:01 UTCJul 8, 00:52 UTC2h 51m
2026-07-07 UAL714 - Jul 7, 17:45 UTCJul 7, 19:35 UTC1h 50m
2026-07-07 UAL709 ORD → LGA Jul 7, 14:30 UTCJul 7, 16:05 UTC1h 35m
2026-07-07 UAL1856 DSM → ORD Jul 7, 11:15 UTCJul 7, 12:10 UTC55m
2026-07-07 UAL1839 - Jul 7, 03:50 UTCJul 7, 04:40 UTC50m
2026-07-06 UAL1621 MCO → ORD Jul 6, 23:55 UTCJul 7, 02:15 UTC2h 20m
2026-07-06 UAL1811 ORD → MCO Jul 6, 18:25 UTCJul 6, 21:10 UTC2h 45m
2026-07-06 UAL1310 LGA → ORD Jul 6, 14:30 UTCJul 6, 16:35 UTC2h 5m
2026-07-06 UAL1310 LGA → ORD Jul 6, 14:38 UTCJul 6, 16:14 UTC1h 36m
2026-07-06 UAL2617 - Jul 6, 11:15 UTCJul 6, 12:50 UTC1h 35m
2026-07-05 UAL433 ALB → ORD Jul 5, 21:00 UTCJul 5, 23:35 UTC2h 35m
2026-07-05 UAL433 ALB → ORD Jul 5, 20:59 UTCJul 5, 23:11 UTC2h 12m
2026-07-05 UAL1554 SJC → DEN Jul 5, 17:50 UTCJul 5, 19:20 UTC1h 30m
2026-07-05 UAL1398 GRB → ORD Jul 5, 14:10 UTCJul 5, 14:45 UTC35m
2026-07-04 UAL1398 COS → GRB Jul 4, 18:30 UTCJul 4, 21:10 UTC2h 40m
2026-07-04 UAL1082 ORD → COS Jul 4, 15:00 UTCJul 4, 17:20 UTC2h 20m
2026-07-04 UAL1793 DCA → ORD Jul 4, 10:45 UTCJul 4, 12:15 UTC1h 30m
2026-07-03 UAL1627 - Jul 3, 23:25 UTCJul 4, 02:00 UTC2h 35m
2026-07-03 UAL2457 - Jul 3, 20:35 UTCJul 3, 20:45 UTC10m

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 N78509 page for operator, model, and routing details .

Mode-S AAA593 frequently asked

What is Mode-S code AAA593?
AAA593 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N78509.
Where is Mode-S AAA593 registered?
Mode-S code AAA593 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 AAA593 broadcasting right now?
Yes. Mode-S AAA593 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAA593, octal 52522623, decimal 11,183,507.
What flights does AAA593 operate?
Mode-S AAA593 has broadcast 20 distinct callsigns, including UAL1911, UAL275, UAL294, UAL728, UAL644.