Apparatus

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sensors Mode-S transponder

AA2BA5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75429 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
AA2BA5
Octal
52425645
Decimal
11,152,293
Country
US
Tail
N75429
Type
B739
No current signal · last broadcast Jul 26, 01:30 UTC
Flights observed
427
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 01:30 UTC

Last known position

Most recent position reported by Mode-S AA2BA5.

Country allocation

The ICAO 24-bit address AA2BA5 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
UAL279 - 10 2026-06-15
UAL414 United Airlines 7 2026-07-23
UAL370 United Airlines 6 2026-06-11
UAL361 - 6 2026-07-16
UAL1615 - 5 2026-07-16
UAL1576 - 5 2026-06-17
UAL1195 - 5 2026-07-16
UAL2443 United Airlines 4 2026-06-09
UAL2042 - 4 2026-07-21
UAL1850 - 4 2026-06-28
UAL1623 United Airlines 4 2026-07-25
UAL1538 United Airlines 4 2026-06-14
UAL1273 United Airlines 4 2026-07-17
UAL841 United Airlines 3 2026-04-15
UAL8243 - 3 2026-07-04
UAL765 United Airlines 3 2026-05-13
UAL721 United Airlines 3 2026-07-20
UAL683 United Airlines 3 2026-05-18
UAL661 United Airlines 3 2026-05-10
UAL444 - 3 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL3896 IAH → EWR Jul 26, 00:37 UTCJul 26, 01:34 UTC57m
2026-07-26 UAL3896 IAH → EWR Jul 26, 00:15 UTCJul 26, 00:20 UTC5m
2026-07-25 UAL1623 EWR → AUS Jul 25, 21:50 UTCJul 25, 21:55 UTC5m
2026-07-25 UAL1623 EWR → AUS Jul 25, 20:10 UTCJul 25, 21:55 UTC1h 45m
2026-07-25 UAL1623 EWR → AUS Jul 25, 20:07 UTCJul 25, 21:35 UTC1h 28m
2026-07-25 UAL1623 EWR → AUS Jul 25, 17:50 UTCJul 25, 18:10 UTC20m
2026-07-25 UAL2433 JAX → EWR Jul 25, 01:00 UTCJul 25, 04:50 UTC3h 50m
2026-07-24 UAL2466 SJC → DEN Jul 24, 21:15 UTCJul 24, 23:00 UTC1h 45m
2026-07-24 UAL1401 AUS → SFO Jul 24, 19:30 UTCJul 24, 19:40 UTC10m
2026-07-24 UAL1401 AUS → SFO Jul 24, 17:40 UTCJul 24, 19:15 UTC1h 35m
2026-07-24 UAL1401 AUS → SFO Jul 24, 17:30 UTCJul 24, 19:11 UTC1h 41m
2026-07-24 UAL2471 SAN → EWR Jul 24, 13:35 UTCJul 24, 16:00 UTC2h 25m
2026-07-24 UAL8140 LGA → IAH Jul 24, 06:55 UTCJul 24, 11:25 UTC4h 30m
2026-07-24 UAL2241 EWR → SAT Jul 24, 03:05 UTCJul 24, 05:10 UTC2h 5m
2026-07-23 UAL2013 EWR → PTY Jul 23, 22:25 UTCJul 24, 00:50 UTC2h 25m
2026-07-23 UAL414 EWR → SFO Jul 23, 16:40 UTCJul 23, 20:35 UTC3h 55m
2026-07-23 UAL375 BOS → IAH Jul 23, 14:25 UTCJul 23, 15:05 UTC40m
2026-07-23 UAL2673 ORD → LGA Jul 23, 10:35 UTCJul 23, 12:25 UTC1h 50m
2026-07-23 UAL2335 LAX → EWR Jul 23, 01:40 UTCJul 23, 03:40 UTC2h 0m
2026-07-22 UAL485 LAS → EWR Jul 22, 22:35 UTCJul 23, 00:05 UTC1h 30m
2026-07-22 UAL485 LAS → EWR Jul 22, 22:18 UTCJul 22, 23:59 UTC1h 41m
2026-07-22 UAL2784 GUM → SFO Jul 22, 18:00 UTCJul 22, 19:55 UTC1h 55m
2026-07-22 UAL2784 GUM → SFO Jul 22, 17:45 UTCJul 22, 19:36 UTC1h 51m
2026-07-22 UAL2752 ORD → PHL Jul 22, 14:30 UTCJul 22, 15:55 UTC1h 25m
2026-07-22 UAL2218 SJU → EWR Jul 22, 11:10 UTCJul 22, 12:30 UTC1h 20m
2026-07-21 UAL1946 - Jul 21, 23:30 UTCJul 22, 00:30 UTC1h 0m
2026-07-21 UAL2160 PHX → SFO Jul 21, 19:30 UTCJul 21, 21:30 UTC2h 0m
2026-07-21 UAL441 EWR → FLL Jul 21, 15:50 UTCJul 21, 17:35 UTC1h 45m
2026-07-21 UAL2420 RSW → IAH Jul 21, 11:40 UTCJul 21, 13:45 UTC2h 5m
2026-07-21 UAL2042 IAD → MSY Jul 21, 00:15 UTCJul 21, 02:25 UTC2h 10m
2026-07-20 UAL721 EWR → MCO Jul 20, 18:40 UTCJul 20, 19:45 UTC1h 5m
2026-07-20 UAL1117 - Jul 20, 14:55 UTCJul 20, 16:45 UTC1h 50m
2026-07-20 UAL490 - Jul 20, 11:15 UTCJul 20, 12:15 UTC1h 0m
2026-07-20 UAL457 ORD → CLE Jul 20, 02:55 UTCJul 20, 03:40 UTC45m
2026-07-19 UAL1673 - Jul 19, 22:15 UTCJul 19, 23:20 UTC1h 5m
2026-07-19 UAL1502 EWR → ORD Jul 19, 19:45 UTCJul 19, 20:35 UTC50m
2026-07-19 UAL1502 EWR → ORD Jul 19, 19:58 UTCJul 19, 20:33 UTC35m
2026-07-19 UAL664 LAS → ORD Jul 19, 14:21 UTCJul 19, 17:10 UTC2h 49m
2026-07-19 UAL664 - Jul 19, 14:15 UTCJul 19, 17:15 UTC3h 0m
2026-07-19 UAL1764 IAD → LAS Jul 19, 04:50 UTCJul 19, 09:00 UTC4h 10m
2026-07-19 UAL2437 ORD → IAD Jul 19, 00:00 UTCJul 19, 01:35 UTC1h 35m
2026-07-18 UAL8131 BWI → YYZ Jul 18, 18:20 UTCJul 18, 20:15 UTC1h 55m
2026-07-18 UAL2277 ORD → SAT Jul 18, 14:10 UTCJul 18, 15:35 UTC1h 25m
2026-07-18 UAL2277 ORD → SAT Jul 18, 14:13 UTCJul 18, 15:36 UTC1h 23m
2026-07-18 UAL8183 LGA → YUL Jul 18, 03:55 UTCJul 18, 06:00 UTC2h 5m
2026-07-18 UAL8183 LGA → YUL Jul 18, 03:52 UTCJul 18, 05:45 UTC1h 53m
2026-07-17 UAL2741 - Jul 17, 23:45 UTCJul 18, 02:29 UTC2h 45m
2026-07-17 UAL2741 - Jul 17, 20:44 UTCJul 17, 21:55 UTC1h 10m
2026-07-17 UAL1653 - Jul 17, 13:20 UTCJul 17, 17:50 UTC4h 30m
2026-07-17 UAL1145 SFO → CUN Jul 17, 07:14 UTCJul 17, 11:55 UTC4h 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 N75429 page for operator, model, and routing details .

Mode-S AA2BA5 frequently asked

What is Mode-S code AA2BA5?
AA2BA5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75429.
Where is Mode-S AA2BA5 registered?
Mode-S code AA2BA5 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 AA2BA5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 01:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA2BA5, octal 52425645, decimal 11,152,293.
What flights does AA2BA5 operate?
Mode-S AA2BA5 has broadcast 20 distinct callsigns, including UAL279, UAL414, UAL370, UAL361, UAL1615.