Apparatus

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sensors Mode-S transponder

AA56DA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76528 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA56DA
Octal
52453332
Decimal
11,163,354
Country
US
Tail
N76528
Type
B738
Broadcasting now · callsign UAL1089 · 35,000 ft
Flights observed
418
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

AA56DA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA56DA 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
UAL669 United Airlines 8 2026-05-27
UAL2395 - 5 2026-06-20
UAL211 United Airlines 5 2026-05-04
UAL1968 - 5 2026-07-09
UAL590 - 4 2026-07-08
UAL586 - 4 2026-06-28
UAL467 United Airlines 4 2026-05-05
UAL2745 - 4 2026-06-13
UAL2627 United Airlines 4 2026-05-19
UAL2051 United Airlines 4 2026-06-12
UAL1915 - 4 2026-06-30
UAL1816 United Airlines 4 2026-05-18
UAL1720 - 4 2026-07-08
UAL1303 United Airlines 4 2026-06-29
UAL644 - 3 2026-07-13
UAL500 - 3 2026-06-17
UAL469 - 3 2026-07-14
UAL373 United Airlines 3 2026-06-15
UAL302 - 3 2026-07-01
UAL2819 - 3 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1024 - Jul 14, 13:15 UTCJul 14, 14:55 UTC1h 40m
2026-07-14 UAL469 - Jul 14, 10:45 UTCJul 14, 11:15 UTC30m
2026-07-14 UAL469 IAH → LAX Jul 14, 10:42 UTCJul 14, 11:17 UTC35m
2026-07-14 UAL2819 DEN → SAT Jul 14, 00:02 UTCJul 14, 02:09 UTC2h 7m
2026-07-14 UAL2819 DEN → SAT Jul 14, 00:20 UTCJul 14, 02:10 UTC1h 50m
2026-07-13 UAL2155 - Jul 13, 21:20 UTCJul 13, 22:20 UTC1h 0m
2026-07-13 UAL2383 - Jul 13, 18:50 UTCJul 13, 19:20 UTC30m
2026-07-13 UAL644 DFW → DEN Jul 13, 16:15 UTCJul 13, 17:45 UTC1h 30m
2026-07-13 UAL1565 DEN → DFW Jul 13, 03:15 UTCJul 13, 04:50 UTC1h 35m
2026-07-12 UAL725 - Jul 12, 22:30 UTCJul 12, 23:25 UTC55m
2026-07-12 UAL691 DEN → ABQ Jul 12, 20:10 UTCJul 12, 21:00 UTC50m
2026-07-12 UAL640 YVR → DEN Jul 12, 15:55 UTCJul 12, 18:05 UTC2h 10m
2026-07-12 UAL640 - Jul 12, 15:45 UTCJul 12, 18:05 UTC2h 20m
2026-07-12 UAL1973 - Jul 12, 04:50 UTCJul 12, 06:20 UTC1h 30m
2026-07-12 UAL2681 - Jul 12, 02:40 UTCJul 12, 03:30 UTC50m
2026-07-11 UAL244 PVR → LAX Jul 11, 22:14 UTCJul 12, 00:31 UTC2h 17m
2026-07-11 UAL244 - Jul 11, 18:25 UTCJul 12, 00:35 UTC6h 10m
2026-07-11 UAL354 - Jul 11, 12:10 UTCJul 11, 16:30 UTC4h 20m
2026-07-10 UAL1692 - Jul 10, 18:25 UTCJul 10, 22:25 UTC4h 0m
2026-07-10 UAL2318 - Jul 10, 11:50 UTCJul 10, 16:45 UTC4h 55m
2026-07-10 UAL675 ORD → BWI Jul 10, 05:53 UTCJul 10, 06:54 UTC1h 1m
2026-07-10 UAL675 ORD → BWI Jul 10, 05:40 UTCJul 10, 07:00 UTC1h 20m
2026-07-10 UAL791 - Jul 10, 02:00 UTCJul 10, 04:25 UTC2h 25m
2026-07-10 UAL791 BWI → ORD Jul 10, 01:29 UTCJul 10, 04:08 UTC2h 39m
2026-07-09 UAL2124 ORD → BWI Jul 9, 22:50 UTCJul 10, 00:25 UTC1h 35m
2026-07-09 UAL1968 YYC → ORD Jul 9, 14:49 UTCJul 9, 17:26 UTC2h 37m
2026-07-09 UAL1968 - Jul 9, 14:40 UTCJul 9, 17:45 UTC3h 5m
2026-07-09 UAL1156 ORD → YYC Jul 9, 01:22 UTCJul 9, 05:02 UTC3h 40m
2026-07-09 UAL1156 ORD → YYC Jul 9, 01:30 UTCJul 9, 05:05 UTC3h 35m
2026-07-08 UAL590 - Jul 8, 21:45 UTCJul 8, 23:25 UTC1h 40m
2026-07-08 UAL1720 - Jul 8, 17:50 UTCJul 8, 20:30 UTC2h 40m
2026-07-08 UAL722 - Jul 8, 13:55 UTCJul 8, 16:10 UTC2h 15m
2026-07-08 UAL1956 - Jul 8, 00:00 UTCJul 8, 02:05 UTC2h 5m
2026-07-07 UAL2141 - Jul 7, 13:35 UTCJul 7, 14:50 UTC1h 15m
2026-07-07 UAL2109 PIT → DEN Jul 7, 01:35 UTCJul 7, 02:30 UTC55m
2026-07-07 UAL2109 PIT → DEN Jul 7, 01:35 UTCJul 7, 03:30 UTC1h 55m
2026-07-06 UAL1867 - Jul 6, 21:00 UTCJul 6, 22:50 UTC1h 50m
2026-07-06 UAL1919 - Jul 6, 17:45 UTCJul 6, 18:00 UTC15m
2026-07-06 UAL1919 IAH → CZM Jul 6, 17:41 UTCJul 6, 19:32 UTC1h 51m
2026-07-06 UAL2319 - Jul 6, 13:25 UTCJul 6, 15:20 UTC1h 55m
2026-07-04 UAL1501 - Jul 4, 18:00 UTCJul 4, 19:50 UTC1h 50m
2026-07-04 UAL1645 - Jul 4, 10:35 UTCJul 4, 12:30 UTC1h 55m
2026-07-04 UAL1645 CLE → IAH Jul 4, 10:45 UTCJul 4, 13:00 UTC2h 15m
2026-07-02 UAL717 - Jul 2, 18:15 UTCJul 2, 22:25 UTC4h 10m
2026-07-02 UAL694 SFO → KOA Jul 2, 12:15 UTCJul 2, 15:30 UTC3h 15m
2026-07-02 UAL2332 - Jul 2, 01:00 UTCJul 2, 03:55 UTC2h 55m
2026-07-01 UAL1375 JAX → EWR Jul 1, 21:55 UTCJul 1, 22:50 UTC55m
2026-07-01 UAL430 DEN → ONT Jul 1, 18:12 UTCJul 1, 20:01 UTC1h 49m
2026-07-01 UAL430 DEN → ONT Jul 1, 18:10 UTCJul 1, 20:05 UTC1h 55m
2026-07-01 UAL2853 - Jul 1, 14:05 UTCJul 1, 15:45 UTC1h 40m

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 N76528 page for operator, model, and routing details .

Mode-S AA56DA frequently asked

What is Mode-S code AA56DA?
AA56DA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76528.
Where is Mode-S AA56DA registered?
Mode-S code AA56DA 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 AA56DA broadcasting right now?
Yes. Mode-S AA56DA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA56DA, octal 52453332, decimal 11,163,354.
What flights does AA56DA operate?
Mode-S AA56DA has broadcast 20 distinct callsigns, including UAL669, UAL2395, UAL211, UAL1968, UAL590.