Apparatus

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sensors Mode-S transponder

AA2BC1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75432 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
AA2BC1
Octal
52425701
Decimal
11,152,321
Country
US
Tail
N75432
Type
B739
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
440
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AA2BC1.

Country allocation

The ICAO 24-bit address AA2BC1 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
UAL546 - 6 2026-06-19
UAL503 United Airlines 5 2026-05-12
UAL2466 - 5 2026-06-22
UAL2326 - 5 2026-06-17
UAL2433 - 4 2026-06-23
UAL2223 - 4 2026-06-17
UAL2053 - 4 2026-06-22
UAL1140 - 4 2026-07-08
UAL2737 United Airlines 3 2026-07-20
UAL2630 United Airlines 3 2026-06-16
UAL2608 United Airlines 3 2026-07-24
UAL2425 - 3 2026-07-14
UAL2258 United Airlines 3 2026-04-18
UAL2013 - 3 2026-07-17
UAL1875 United Airlines 3 2026-06-04
UAL1801 United Airlines 3 2026-04-17
UAL1761 United Airlines 3 2026-04-22
UAL1689 - 3 2026-07-11
UAL1550 - 3 2026-07-12
UAL1490 United Airlines 3 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1773 MIA → EWR Jul 26, 20:30 UTCJul 26, 22:15 UTC1h 45m
2026-07-26 UAL1834 DFW → EWR Jul 26, 16:45 UTCJul 26, 18:50 UTC2h 5m
2026-07-26 UAL1834 DFW → EWR Jul 26, 12:30 UTCJul 26, 14:45 UTC2h 15m
2026-07-25 UAL2161 EWR → MCO Jul 25, 22:10 UTCJul 26, 01:25 UTC3h 15m
2026-07-25 UAL744 IAD → EWR Jul 25, 19:40 UTCJul 25, 20:10 UTC30m
2026-07-25 UAL1859 IAD → BTV Jul 25, 17:30 UTCJul 25, 18:00 UTC30m
2026-07-25 UAL1361 SNA → IAH Jul 25, 12:40 UTCJul 25, 15:50 UTC3h 10m
2026-07-25 UAL444 BNA → IAD Jul 25, 02:50 UTCJul 25, 03:45 UTC55m
2026-07-25 UAL444 BNA → IAD Jul 25, 02:40 UTCJul 25, 03:46 UTC1h 6m
2026-07-24 UAL2136 LAX → BOS Jul 24, 23:50 UTCJul 25, 01:00 UTC1h 10m
2026-07-24 UAL1957 PHL → IAH Jul 24, 17:55 UTCJul 24, 21:15 UTC3h 20m
2026-07-24 UAL2608 LAS → IAH Jul 24, 13:30 UTCJul 24, 16:10 UTC2h 40m
2026-07-24 UAL1764 SFO → IAH Jul 24, 00:25 UTCJul 24, 04:40 UTC4h 15m
2026-07-23 UAL2437 LGA → DEN Jul 23, 21:35 UTCJul 23, 22:55 UTC1h 20m
2026-07-23 UAL2437 LGA → DEN Jul 23, 21:29 UTCJul 23, 22:55 UTC1h 26m
2026-07-23 UAL2443 MSN → ORD Jul 23, 18:20 UTCJul 23, 19:15 UTC55m
2026-07-23 UAL2389 LGA → ORD Jul 23, 16:00 UTCJul 23, 16:50 UTC50m
2026-07-23 UAL1297 LAS → EWR Jul 23, 12:20 UTCJul 23, 14:10 UTC1h 50m
2026-07-23 UAL1989 SFO → IAH Jul 23, 00:00 UTCJul 23, 01:30 UTC1h 30m
2026-07-23 UAL1989 SFO → IAH Jul 23, 00:09 UTCJul 23, 01:24 UTC1h 15m
2026-07-22 UAL636 CHS → EWR Jul 22, 20:00 UTCJul 22, 21:55 UTC1h 55m
2026-07-22 UAL1180 DEN → CID Jul 22, 13:55 UTCJul 22, 16:50 UTC2h 55m
2026-07-22 UAL1180 DEN → CID Jul 22, 14:10 UTCJul 22, 17:06 UTC2h 56m
2026-07-21 UAL456 EWR → SRQ Jul 21, 18:25 UTCJul 21, 20:45 UTC2h 20m
2026-07-21 UAL1688 IAD → IAH Jul 21, 14:40 UTCJul 21, 16:45 UTC2h 5m
2026-07-20 UAL2737 LCQ → EWR Jul 20, 22:05 UTCJul 20, 22:10 UTC5m
2026-07-20 UAL2737 LCQ → EWR Jul 20, 18:20 UTCJul 20, 22:10 UTC3h 50m
2026-07-20 UAL2737 LCQ → EWR Jul 20, 18:18 UTCJul 20, 21:48 UTC3h 30m
2026-07-20 UAL2736 STI → EWR Jul 20, 13:35 UTCJul 20, 15:40 UTC2h 5m
2026-07-20 UAL2736 STI → EWR Jul 20, 13:38 UTCJul 20, 16:44 UTC3h 6m
2026-07-20 UAL1490 SFO → BOI Jul 20, 06:45 UTCJul 20, 10:05 UTC3h 20m
2026-07-20 UAL2738 ORD → PDX Jul 20, 01:15 UTCJul 20, 05:05 UTC3h 50m
2026-07-19 UAL2627 EWR → ORD Jul 19, 21:20 UTCJul 19, 23:50 UTC2h 30m
2026-07-19 UAL2643 DEN → BOS Jul 19, 16:00 UTCJul 19, 19:20 UTC3h 20m
2026-07-19 UAL1232 EWR → ORD Jul 19, 13:10 UTCJul 19, 14:10 UTC1h 0m
2026-07-19 UAL2769 DEN → SLC Jul 19, 01:48 UTCJul 19, 03:03 UTC1h 15m
2026-07-19 UAL2769 DEN → SLC Jul 19, 01:50 UTCJul 19, 02:55 UTC1h 5m
2026-07-18 UAL287 - Jul 18, 20:15 UTCJul 19, 00:15 UTC4h 0m
2026-07-18 UAL2804 - Jul 18, 17:15 UTCJul 18, 18:50 UTC1h 35m
2026-07-18 UAL2804 ORD → PWM Jul 18, 17:05 UTCJul 18, 18:56 UTC1h 51m
2026-07-18 UAL2749 - Jul 18, 13:50 UTCJul 18, 15:25 UTC1h 35m
2026-07-18 UAL1340 FLL → EWR Jul 18, 06:15 UTCJul 18, 11:15 UTC5h 0m
2026-07-18 UAL2241 EWR → SAT Jul 18, 02:50 UTCJul 18, 04:50 UTC2h 0m
2026-07-18 UAL2241 EWR → SAT Jul 18, 02:41 UTCJul 18, 04:37 UTC1h 56m
2026-07-17 UAL2013 DEN → SEA Jul 17, 22:35 UTCJul 18, 00:55 UTC2h 20m
2026-07-17 UAL2013 DEN → SEA Jul 17, 22:31 UTCJul 18, 00:51 UTC2h 20m
2026-07-17 UAL757 SEA → DEN Jul 17, 18:55 UTCJul 17, 21:05 UTC2h 10m
2026-07-17 UAL757 SEA → DEN Jul 17, 18:46 UTCJul 17, 21:00 UTC2h 14m
2026-07-17 UAL2271 LAX → SEA Jul 17, 14:24 UTCJul 17, 16:40 UTC2h 15m
2026-07-17 UAL1291 LAS → DEN Jul 17, 01:39 UTCJul 17, 03:10 UTC1h 30m

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 N75432 page for operator, model, and routing details .

Mode-S AA2BC1 frequently asked

What is Mode-S code AA2BC1?
AA2BC1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75432.
Where is Mode-S AA2BC1 registered?
Mode-S code AA2BC1 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 AA2BC1 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 AA2BC1, octal 52425701, decimal 11,152,321.
What flights does AA2BC1 operate?
Mode-S AA2BC1 has broadcast 20 distinct callsigns, including UAL546, UAL503, UAL2466, UAL2326, UAL2433.