Apparatus

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sensors Mode-S transponder

AA2BA2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75426 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
AA2BA2
Octal
52425642
Decimal
11,152,290
Country
US
Tail
N75426
Type
B739
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
430
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S AA2BA2.

Country allocation

The ICAO 24-bit address AA2BA2 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
UAL538 United Airlines 4 2026-06-11
UAL519 - 4 2026-06-15
UAL2631 United Airlines 4 2026-04-21
UAL2331 United Airlines 4 2026-07-06
UAL1516 United Airlines 4 2026-04-29
UAL1512 United Airlines 4 2026-04-25
UAL1279 - 4 2026-07-02
UAL1206 - 4 2026-07-04
UAL1198 United Airlines 4 2026-05-05
UAL1056 - 4 2026-07-14
UAL779 United Airlines 3 2026-04-17
UAL684 - 3 2026-07-12
UAL656 - 3 2026-07-10
UAL577 - 3 2026-06-27
UAL2851 United Airlines 3 2026-06-15
UAL2774 United Airlines 3 2026-06-10
UAL2460 - 3 2026-04-15
UAL2318 - 3 2026-07-11
UAL1969 United Airlines 3 2026-05-16
UAL1902 United Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1596 PDX → SFO Jul 26, 22:20 UTCJul 26, 22:30 UTC10m
2026-07-26 UAL1561 SFO → PDX Jul 26, 18:05 UTCJul 26, 20:15 UTC2h 10m
2026-07-26 UAL728 AUS → EWR Jul 26, 13:50 UTCJul 26, 16:25 UTC2h 35m
2026-07-25 UAL1843 SFO → ORD Jul 25, 23:55 UTCJul 26, 02:15 UTC2h 20m
2026-07-25 UAL1961 LAS → IAD Jul 25, 20:10 UTCJul 25, 22:15 UTC2h 5m
2026-07-25 UAL2145 MFR → SFO Jul 25, 15:05 UTCJul 25, 18:50 UTC3h 45m
2026-07-25 UAL2672 DEN → MSN Jul 25, 10:15 UTCJul 25, 12:35 UTC2h 20m
2026-07-24 UAL1680 MIA → EWR Jul 24, 23:30 UTCJul 25, 02:40 UTC3h 10m
2026-07-24 UAL2724 LAS → SFO Jul 24, 19:35 UTCJul 24, 21:40 UTC2h 5m
2026-07-24 UAL2724 LAS → SFO Jul 24, 15:10 UTCJul 24, 17:30 UTC2h 20m
2026-07-23 UAL2725 PDX → SFO Jul 23, 21:35 UTCJul 24, 00:15 UTC2h 40m
2026-07-23 UAL2234 IAH → LAX Jul 23, 17:00 UTCJul 23, 19:15 UTC2h 15m
2026-07-23 UAL2168 JAX → IAH Jul 23, 12:15 UTCJul 23, 15:30 UTC3h 15m
2026-07-23 UAL2241 EWR → SAT Jul 23, 03:30 UTCJul 23, 05:20 UTC1h 50m
2026-07-22 UAL2013 EWR → PTY Jul 22, 23:55 UTCJul 23, 02:15 UTC2h 20m
2026-07-22 UAL414 EWR → SFO Jul 22, 16:35 UTCJul 22, 20:45 UTC4h 10m
2026-07-21 UAL1117 - Jul 21, 14:55 UTCJul 21, 16:40 UTC1h 45m
2026-07-21 UAL2333 ORD → SFO Jul 21, 10:25 UTCJul 21, 12:25 UTC2h 0m
2026-07-21 UAL2362 LGA → ORD Jul 21, 00:20 UTCJul 21, 01:55 UTC1h 35m
2026-07-20 UAL1748 PHX → ORD Jul 20, 18:25 UTCJul 20, 21:30 UTC3h 5m
2026-07-20 UAL659 EWR → IAD Jul 20, 16:00 UTCJul 20, 17:00 UTC1h 0m
2026-07-20 UAL2110 SAN → SFO Jul 20, 11:15 UTCJul 20, 14:05 UTC2h 50m
2026-07-19 UAL8193 YYG → YUL Jul 19, 22:05 UTCJul 20, 01:35 UTC3h 30m
2026-07-19 UAL794 EWR → SAN Jul 19, 18:25 UTCJul 19, 20:15 UTC1h 50m
2026-07-19 UAL794 EWR → SAN Jul 19, 18:29 UTCJul 19, 20:15 UTC1h 46m
2026-07-19 UAL343 DCA → ORD Jul 19, 15:25 UTCJul 19, 16:50 UTC1h 25m
2026-07-19 UAL2175 ORD → BNA Jul 19, 12:40 UTCJul 19, 13:35 UTC55m
2026-07-19 UAL2094 PDX → ORD Jul 19, 05:50 UTCJul 19, 09:00 UTC3h 10m
2026-07-18 UAL2817 ORD → PDX Jul 18, 18:45 UTCJul 18, 22:35 UTC3h 50m
2026-07-15 UAL664 LAS → ORD Jul 15, 14:20 UTCJul 15, 17:45 UTC3h 25m
2026-07-14 UAL2658 - Jul 14, 23:25 UTCJul 15, 01:55 UTC2h 30m
2026-07-14 UAL1056 - Jul 14, 19:00 UTCJul 14, 21:30 UTC2h 30m
2026-07-14 UAL1056 CUN → IAH Jul 14, 19:01 UTCJul 14, 21:29 UTC2h 28m
2026-07-14 UAL1014 - Jul 14, 15:55 UTCJul 14, 17:35 UTC1h 40m
2026-07-14 UAL1014 IAH → CUN Jul 14, 15:44 UTCJul 14, 17:34 UTC1h 50m
2026-07-14 UAL320 - Jul 14, 11:00 UTCJul 14, 13:05 UTC2h 5m
2026-07-14 UAL1218 - Jul 14, 03:00 UTCJul 14, 05:05 UTC2h 5m
2026-07-13 UAL2279 SFO → SEA Jul 13, 23:53 UTCJul 14, 01:12 UTC1h 19m
2026-07-13 UAL2279 SFO → SEA Jul 13, 23:50 UTCJul 14, 01:15 UTC1h 25m
2026-07-13 UAL8220 LAS → SFO Jul 13, 21:10 UTCJul 13, 22:10 UTC1h 0m
2026-07-13 UAL8220 LAS → SFO Jul 13, 21:02 UTCJul 13, 22:09 UTC1h 7m
2026-07-13 UAL611 - Jul 13, 18:20 UTCJul 13, 19:30 UTC1h 10m
2026-07-13 UAL2322 - Jul 13, 14:50 UTCJul 13, 16:50 UTC2h 0m
2026-07-13 UAL2191 - Jul 13, 02:35 UTCJul 13, 04:35 UTC2h 0m
2026-07-13 UAL2191 LAX → YVR Jul 13, 02:44 UTCJul 13, 04:31 UTC1h 47m
2026-07-12 UAL684 - Jul 12, 19:35 UTCJul 13, 00:15 UTC4h 40m
2026-07-12 UAL1869 ORD → IAD Jul 12, 16:35 UTCJul 12, 18:01 UTC1h 25m
2026-07-12 UAL490 - Jul 12, 11:20 UTCJul 12, 12:20 UTC1h 0m
2026-07-12 UAL490 ORD → SAT Jul 12, 11:18 UTCJul 12, 12:09 UTC51m
2026-07-12 UAL8241 - Jul 12, 04:40 UTCJul 12, 08:45 UTC4h 5m

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 N75426 page for operator, model, and routing details .

Mode-S AA2BA2 frequently asked

What is Mode-S code AA2BA2?
AA2BA2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75426.
Where is Mode-S AA2BA2 registered?
Mode-S code AA2BA2 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 AA2BA2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA2BA2, octal 52425642, decimal 11,152,290.
What flights does AA2BA2 operate?
Mode-S AA2BA2 has broadcast 20 distinct callsigns, including UAL538, UAL519, UAL2631, UAL2331, UAL1516.