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 UAL2633 · 13,825 ft
Flights observed
350
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

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
UAL1721 United Airlines 20 2026-07-26
UAL1722 United Airlines 19 2026-07-26
UAL1509 - 15 2026-07-15
UAL1654 United Airlines 14 2026-07-26
UAL1718 - 12 2026-07-16
UAL1719 - 11 2026-07-16
UAL1636 - 11 2026-07-13
UAL1224 - 10 2026-07-12
UAL373 - 9 2026-07-14
UAL501 United Airlines 8 2026-07-22
UAL2348 United Airlines 8 2026-07-22
UAL1829 United Airlines 8 2026-07-23
UAL1221 - 8 2026-07-15
UAL2268 - 7 2026-07-16
UAL1495 - 7 2026-06-25
UAL1022 United Airlines 7 2026-07-23
UAL638 United Airlines 6 2026-07-22
UAL1431 United Airlines 6 2026-07-20
UAL1116 - 6 2026-06-24
UAL798 United Airlines 5 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1722 OGG → SFO Jul 26, 22:15 UTCJul 26, 22:30 UTC15m
2026-07-26 UAL1721 SFO → KOA Jul 26, 20:45 UTCJul 26, 20:50 UTC5m
2026-07-26 UAL1721 SFO → KOA Jul 26, 15:55 UTCJul 26, 16:35 UTC40m
2026-07-26 UAL2367 PIT → SFO Jul 26, 11:25 UTCJul 26, 13:35 UTC2h 10m
2026-07-26 UAL1654 OMA → SFO Jul 26, 00:00 UTCJul 26, 02:00 UTC2h 0m
2026-07-25 UAL8104 YUL → YFC Jul 25, 20:26 UTCJul 25, 22:09 UTC1h 43m
2026-07-25 UAL8104 YUL → YFC Jul 25, 20:20 UTCJul 25, 22:15 UTC1h 55m
2026-07-25 UAL1865 SLC → EWR Jul 25, 14:20 UTCJul 25, 17:30 UTC3h 10m
2026-07-25 UAL2282 SAN → IAD Jul 25, 07:05 UTCJul 25, 11:25 UTC4h 20m
2026-07-24 UAL1967 DEN → MSN Jul 24, 23:58 UTCJul 25, 03:20 UTC3h 22m
2026-07-24 UAL1967 DEN → MSN Jul 24, 23:55 UTCJul 25, 03:25 UTC3h 30m
2026-07-24 UAL1954 RDM → SFO Jul 24, 18:20 UTCJul 24, 21:55 UTC3h 35m
2026-07-24 UAL2391 ORD → EWR Jul 24, 13:58 UTCJul 24, 16:31 UTC2h 33m
2026-07-24 UAL2391 ORD → EWR Jul 24, 14:25 UTCJul 24, 16:30 UTC2h 5m
2026-07-24 UAL1654 OMA → SFO Jul 24, 00:55 UTCJul 24, 03:15 UTC2h 20m
2026-07-23 UAL1829 EWR → SFO Jul 23, 20:20 UTCJul 23, 22:25 UTC2h 5m
2026-07-23 UAL1022 DEN → SAT Jul 23, 14:15 UTCJul 23, 17:30 UTC3h 15m
2026-07-22 UAL501 MCO → EWR Jul 22, 20:10 UTCJul 22, 23:15 UTC3h 5m
2026-07-22 UAL2348 IAH → LGA Jul 22, 16:15 UTCJul 22, 18:20 UTC2h 5m
2026-07-22 UAL638 MCO → ORD Jul 22, 02:20 UTCJul 22, 13:40 UTC11h 20m
2026-07-20 UAL3863 SJC → SFO Jul 20, 17:35 UTCJul 20, 22:10 UTC4h 35m
2026-07-20 UAL1431 IAH → SNA Jul 20, 00:58 UTCJul 20, 06:03 UTC5h 5m
2026-07-20 UAL1431 IAH → SNA Jul 20, 00:55 UTCJul 20, 06:05 UTC5h 10m
2026-07-19 UAL1868 LAX → EWR Jul 19, 17:10 UTCJul 19, 21:30 UTC4h 20m
2026-07-17 UAL2087 DEN → IAD Jul 17, 16:49 UTCJul 17, 19:45 UTC2h 55m
2026-07-16 UAL599 IAD → DEN Jul 16, 22:40 UTCJul 17, 01:35 UTC2h 55m
2026-07-16 UAL2268 - Jul 16, 15:30 UTCJul 16, 20:05 UTC4h 35m
2026-07-16 UAL1719 KOA → LAX Jul 16, 08:28 UTCJul 16, 13:08 UTC4h 40m
2026-07-16 UAL1719 - Jul 16, 08:40 UTCJul 16, 08:45 UTC5m
2026-07-16 UAL1718 - Jul 16, 05:35 UTCJul 16, 05:45 UTC10m
2026-07-16 UAL1718 - Jul 16, 00:35 UTCJul 16, 01:05 UTC30m
2026-07-16 UAL1718 LAX → KOA Jul 16, 00:36 UTCJul 16, 05:49 UTC5h 13m
2026-07-15 UAL1221 - Jul 15, 21:10 UTCJul 15, 22:15 UTC1h 5m
2026-07-15 UAL1221 - Jul 15, 17:15 UTCJul 15, 17:35 UTC20m
2026-07-15 UAL1509 SFO → HNL Jul 15, 00:41 UTCJul 15, 05:40 UTC4h 59m
2026-07-15 UAL1509 SFO → HNL Jul 15, 00:50 UTCJul 15, 05:50 UTC5h 0m
2026-07-14 UAL373 - Jul 14, 17:15 UTCJul 14, 17:30 UTC15m
2026-07-14 UAL373 HNL → SFO Jul 14, 17:28 UTCJul 14, 21:45 UTC4h 17m
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

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 UAL1721, UAL1722, UAL1509, UAL1654, UAL1718.