Apparatus

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sensors Mode-S transponder

AA3AE2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75851 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
AA3AE2
Octal
52435342
Decimal
11,156,194
Country
US
Tail
N75851
Type
B753
Broadcasting now · callsign UAL373 · 28,450 ft
Flights observed
313
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Current position

AA3AE2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA3AE2 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
UAL1722 - 18 2026-06-24
UAL1721 United Airlines 18 2026-06-23
UAL1509 - 13 2026-07-14
UAL1654 - 12 2026-06-29
UAL1636 - 11 2026-07-13
UAL1224 - 10 2026-07-12
UAL1719 - 9 2026-07-03
UAL1718 - 9 2026-07-03
UAL373 - 8 2026-07-14
UAL501 - 7 2026-06-28
UAL2348 - 7 2026-06-17
UAL1829 United Airlines 7 2026-06-29
UAL1495 - 7 2026-06-25
UAL2268 United Airlines 6 2026-06-02
UAL1221 United Airlines 6 2026-07-02
UAL1116 - 6 2026-06-24
UAL1022 United Airlines 6 2026-06-29
UAL798 United Airlines 5 2026-05-17
UAL638 - 5 2026-06-15
UAL2633 United Airlines 5 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL373 - Jul 14, 17:15 UTCJul 14, 17:30 UTC15m
2026-07-14 UAL1509 - Jul 14, 06:15 UTCJul 14, 06:35 UTC20m
2026-07-14 UAL1509 - Jul 14, 01:45 UTCJul 14, 02:10 UTC25m
2026-07-13 UAL1577 - Jul 13, 20:35 UTCJul 14, 00:05 UTC3h 30m
2026-07-13 UAL1941 - Jul 13, 14:15 UTCJul 13, 18:05 UTC3h 50m
2026-07-13 UAL1636 - Jul 13, 06:05 UTCJul 13, 06:45 UTC40m
2026-07-13 UAL1636 - Jul 13, 01:45 UTCJul 13, 02:01 UTC15m
2026-07-12 UAL1224 - Jul 12, 18:50 UTCJul 12, 19:15 UTC25m
2026-07-12 UAL1224 LAX → HNL Jul 12, 18:50 UTCJul 12, 23:50 UTC5h 0m
2026-07-12 UAL1636 - Jul 12, 01:35 UTCJul 12, 01:50 UTC15m
2026-07-12 UAL1636 HNL → LAX Jul 12, 01:33 UTCJul 12, 06:35 UTC5h 2m
2026-07-11 UAL1224 - Jul 11, 18:55 UTCJul 11, 23:55 UTC5h 0m
2026-07-11 UAL1224 LAX → HNL Jul 11, 18:25 UTCJul 11, 23:53 UTC5h 28m
2026-07-11 UAL1636 - Jul 11, 06:30 UTCJul 11, 07:10 UTC40m
2026-07-11 UAL1636 - Jul 11, 02:20 UTCJul 11, 02:40 UTC20m
2026-07-11 UAL1636 HNL → LAX Jul 11, 02:03 UTCJul 11, 07:04 UTC5h 1m
2026-07-11 UAL1224 - Jul 11, 00:10 UTCJul 11, 00:35 UTC25m
2026-07-10 UAL1224 - Jul 10, 19:05 UTCJul 10, 19:35 UTC30m
2026-07-10 UAL1636 - Jul 10, 01:45 UTCJul 10, 06:35 UTC4h 50m
2026-07-09 UAL1224 LAX → HNL Jul 9, 18:25 UTCJul 9, 23:52 UTC5h 27m
2026-07-09 UAL1224 - Jul 9, 18:25 UTCJul 9, 23:50 UTC5h 25m
2026-07-09 UAL1636 - Jul 9, 05:40 UTCJul 9, 06:30 UTC50m
2026-07-09 UAL1636 - Jul 9, 01:35 UTCJul 9, 01:55 UTC20m
2026-07-08 UAL1224 - Jul 8, 18:40 UTCJul 8, 23:50 UTC5h 10m
2026-07-03 UAL1719 - Jul 3, 12:10 UTCJul 3, 12:45 UTC35m
2026-07-03 UAL1719 - Jul 3, 08:15 UTCJul 3, 08:20 UTC5m
2026-07-03 UAL1718 - Jul 3, 05:40 UTCJul 3, 05:45 UTC5m
2026-07-03 UAL1718 - Jul 3, 00:50 UTCJul 3, 01:20 UTC30m
2026-07-02 UAL1221 PDX → EWR Jul 2, 17:05 UTCJul 2, 22:00 UTC4h 55m
2026-07-01 UAL1431 - Jul 1, 23:40 UTCJul 2, 05:05 UTC5h 25m
2026-07-01 UAL1431 LAX → HNL Jul 1, 23:33 UTCJul 2, 04:58 UTC5h 25m
2026-07-01 UAL1868 - Jul 1, 13:30 UTCJul 1, 18:20 UTC4h 50m
2026-06-30 UAL2087 DEN → IAD Jun 30, 16:45 UTCJun 30, 19:45 UTC3h 0m
2026-06-29 UAL1654 - Jun 29, 23:49 UTCJun 30, 01:40 UTC1h 51m
2026-06-29 UAL1654 IAH → DEN Jun 29, 23:40 UTCJun 30, 01:36 UTC1h 56m
2026-06-29 UAL1829 EWR → SFO Jun 29, 19:44 UTCJun 29, 21:39 UTC1h 55m
2026-06-29 UAL1022 DEN → SAT Jun 29, 14:29 UTCJun 29, 17:34 UTC3h 5m
2026-06-28 UAL501 DEN → MCO Jun 28, 23:39 UTCJun 29, 02:36 UTC2h 57m
2026-06-28 UAL501 DEN → MCO Jun 28, 23:39 UTCJun 29, 02:39 UTC3h 0m
2026-06-28 UAL1022 DEN → SAT Jun 28, 18:29 UTCJun 28, 21:45 UTC3h 15m
2026-06-27 UAL501 - Jun 27, 20:19 UTCJun 27, 23:55 UTC3h 35m
2026-06-27 UAL1865 IAD → DEN Jun 27, 14:25 UTCJun 27, 17:39 UTC3h 15m
2026-06-27 UAL2282 - Jun 27, 07:04 UTCJun 27, 11:20 UTC4h 15m
2026-06-26 UAL2276 - Jun 26, 22:40 UTCJun 27, 03:34 UTC4h 55m
2026-06-26 UAL2087 DEN → IAD Jun 26, 16:54 UTCJun 26, 19:35 UTC2h 40m
2026-06-26 UAL1214 - Jun 26, 01:05 UTCJun 26, 04:10 UTC3h 5m
2026-06-25 UAL8200 DEN → SFO Jun 25, 19:05 UTCJun 25, 21:20 UTC2h 15m
2026-06-25 UAL1758 SFO → DEN Jun 25, 13:45 UTCJun 25, 15:40 UTC1h 55m
2026-06-25 UAL1495 - Jun 25, 03:10 UTCJun 25, 07:49 UTC4h 40m
2026-06-25 UAL1495 ORD → SFO Jun 25, 02:28 UTCJun 25, 07:44 UTC5h 16m

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 N75851 page for operator, model, and routing details .

Mode-S AA3AE2 frequently asked

What is Mode-S code AA3AE2?
AA3AE2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75851.
Where is Mode-S AA3AE2 registered?
Mode-S code AA3AE2 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 AA3AE2 broadcasting right now?
Yes. Mode-S AA3AE2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA3AE2, octal 52435342, decimal 11,156,194.
What flights does AA3AE2 operate?
Mode-S AA3AE2 has broadcast 20 distinct callsigns, including UAL1722, UAL1721, UAL1509, UAL1654, UAL1636.