Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AA3B05

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75861 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
AA3B05
Octal
52435405
Decimal
11,156,229
Country
US
Tail
N75861
Type
B753
No current signal · last broadcast 5h ago
Flights observed
218
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S AA3B05.

Country allocation

The ICAO 24-bit address AA3B05 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
UAL2109 United Airlines 11 2026-04-24
UAL1418 United Airlines 11 2026-04-24
UAL2348 United Airlines 7 2026-06-11
UAL1829 United Airlines 7 2026-06-11
UAL1221 United Airlines 7 2026-06-08
UAL501 - 6 2026-07-14
UAL1431 United Airlines 6 2026-06-06
UAL638 United Airlines 5 2026-06-11
UAL635 United Airlines 5 2026-06-05
UAL1962 United Airlines 5 2026-05-06
UAL1719 United Airlines 5 2026-06-09
UAL1654 United Airlines 5 2026-05-30
UAL1176 United Airlines 5 2026-06-11
UAL1022 United Airlines 5 2026-05-29
UAL576 United Airlines 4 2026-05-02
UAL2633 United Airlines 4 2026-06-10
UAL2475 United Airlines 4 2026-05-03
UAL2391 United Airlines 4 2026-06-10
UAL1791 United Airlines 4 2026-06-05
UAL1718 United Airlines 4 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL501 DEN → MCO Jul 14, 00:40 UTCJul 14, 03:50 UTC3h 10m
2026-07-13 UAL2767 - Jul 13, 20:40 UTCJul 13, 23:00 UTC2h 20m
2026-07-13 UAL1129 - Jul 13, 16:40 UTCJul 13, 19:05 UTC2h 25m
2026-07-13 UAL1575 - Jul 13, 12:50 UTCJul 13, 14:45 UTC1h 55m
2026-07-13 UAL2791 - Jul 13, 00:25 UTCJul 13, 02:20 UTC1h 55m
2026-07-12 UAL2767 - Jul 12, 20:35 UTCJul 12, 22:35 UTC2h 0m
2026-07-12 UAL1129 DEN → IAH Jul 12, 16:28 UTCJul 12, 18:23 UTC1h 55m
2026-07-12 UAL1129 - Jul 12, 16:30 UTCJul 12, 18:35 UTC2h 5m
2026-07-12 UAL1575 - Jul 12, 12:55 UTCJul 12, 14:45 UTC1h 50m
2026-06-11 UAL1829 EWR → SFO Jun 11, 20:00 UTCJun 11, 22:05 UTC2h 5m
2026-06-11 UAL2348 IAH → LGA Jun 11, 16:20 UTCJun 11, 18:25 UTC2h 5m
2026-06-11 UAL1176 SJC → ORD Jun 11, 13:25 UTCJun 11, 14:00 UTC35m
2026-06-11 UAL1176 SJC → ORD Jun 11, 09:25 UTCJun 11, 09:45 UTC20m
2026-06-11 UAL638 MCO → ORD Jun 11, 07:20 UTCJun 11, 07:45 UTC25m
2026-06-11 UAL638 MCO → ORD Jun 11, 02:49 UTCJun 11, 07:39 UTC4h 50m
2026-06-11 UAL638 MCO → ORD Jun 11, 02:45 UTCJun 11, 03:10 UTC25m
2026-06-10 UAL2633 PHL → IAH Jun 10, 22:15 UTCJun 11, 00:25 UTC2h 10m
2026-06-10 UAL2633 PHL → IAH Jun 10, 22:06 UTCJun 11, 00:23 UTC2h 17m
2026-06-10 UAL1604 SFO → BNA Jun 10, 18:45 UTCJun 10, 20:35 UTC1h 50m
2026-06-10 UAL2391 ORD → EWR Jun 10, 14:10 UTCJun 10, 16:25 UTC2h 15m
2026-06-09 UAL599 DEN → EWR Jun 9, 22:20 UTCJun 10, 01:50 UTC3h 30m
2026-06-09 UAL2268 IAD → MCO Jun 9, 15:35 UTCJun 9, 20:00 UTC4h 25m
2026-06-09 UAL1719 ORD → SFO Jun 9, 12:30 UTCJun 9, 13:15 UTC45m
2026-06-09 UAL1719 ORD → SFO Jun 9, 08:20 UTCJun 9, 08:30 UTC10m
2026-06-09 UAL1718 LAS → LAX Jun 9, 05:20 UTCJun 9, 05:30 UTC10m
2026-06-09 UAL1718 LAS → LAX Jun 9, 00:35 UTCJun 9, 01:00 UTC25m
2026-06-08 UAL1221 PDX → EWR Jun 8, 17:05 UTCJun 8, 22:10 UTC5h 5m
2026-06-08 UAL1221 PDX → EWR Jun 8, 17:18 UTCJun 8, 22:05 UTC4h 47m
2026-06-08 UAL1509 SFO → HNL Jun 8, 00:15 UTCJun 8, 05:01 UTC4h 46m
2026-06-08 UAL1509 SFO → HNL Jun 8, 00:20 UTCJun 8, 05:05 UTC4h 45m
2026-06-07 UAL373 BTV → ORD Jun 7, 21:45 UTCJun 7, 22:20 UTC35m
2026-06-07 UAL373 BTV → ORD Jun 7, 17:25 UTCJun 7, 17:45 UTC20m
2026-06-06 UAL1431 IAH → SNA Jun 6, 20:30 UTCJun 6, 21:40 UTC1h 10m
2026-06-06 UAL1431 IAH → SNA Jun 6, 20:33 UTCJun 7, 01:49 UTC5h 16m
2026-06-06 UAL1868 LAX → EWR Jun 6, 13:31 UTCJun 6, 17:56 UTC4h 25m
2026-06-06 UAL1868 LAX → EWR Jun 6, 13:20 UTCJun 6, 18:04 UTC4h 45m
2026-06-05 UAL1791 LAS → ORD Jun 5, 21:20 UTCJun 6, 02:00 UTC4h 40m
2026-06-05 UAL635 EWR → MSY Jun 5, 14:20 UTCJun 5, 19:30 UTC5h 10m
2026-06-05 UAL418 SAN → SFO Jun 5, 07:20 UTCJun 5, 11:40 UTC4h 20m
2026-06-05 UAL418 SAN → SFO Jun 5, 07:11 UTCJun 5, 11:47 UTC4h 36m
2026-06-05 UAL1967 DEN → MSN Jun 5, 02:02 UTCJun 5, 05:34 UTC3h 32m
2026-06-05 UAL1967 DEN → MSN Jun 5, 01:55 UTCJun 5, 05:40 UTC3h 45m
2026-06-04 UAL457 BWI → SFO Jun 4, 20:05 UTCJun 4, 23:50 UTC3h 45m
2026-06-04 UAL1868 LAX → EWR Jun 4, 13:20 UTCJun 4, 18:05 UTC4h 45m
2026-06-03 UAL1791 LAS → ORD Jun 3, 21:35 UTCJun 4, 02:15 UTC4h 40m
2026-06-03 UAL635 EWR → MSY Jun 3, 14:00 UTCJun 3, 19:10 UTC5h 10m
2026-06-02 UAL1791 LAS → ORD Jun 2, 21:10 UTCJun 3, 01:55 UTC4h 45m
2026-06-02 UAL635 EWR → MSY Jun 2, 14:15 UTCJun 2, 19:20 UTC5h 5m
2026-06-01 UAL1791 LAS → ORD Jun 1, 21:45 UTCJun 2, 02:10 UTC4h 25m
2026-06-01 UAL635 EWR → MSY Jun 1, 14:10 UTCJun 1, 19:50 UTC5h 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 N75861 page for operator, model, and routing details .

Mode-S AA3B05 frequently asked

What is Mode-S code AA3B05?
AA3B05 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75861.
Where is Mode-S AA3B05 registered?
Mode-S code AA3B05 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 AA3B05 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA3B05, octal 52435405, decimal 11,156,229.
What flights does AA3B05 operate?
Mode-S AA3B05 has broadcast 20 distinct callsigns, including UAL2109, UAL1418, UAL2348, UAL1829, UAL1221.