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 Jul 26, 21:15 UTC
Flights observed
278
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

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
UAL638 United Airlines 12 2026-07-23
UAL2109 United Airlines 11 2026-04-24
UAL1418 United Airlines 11 2026-04-24
UAL1829 - 10 2026-07-21
UAL1719 - 10 2026-07-20
UAL1221 - 10 2026-07-19
UAL2633 United Airlines 9 2026-07-22
UAL2391 United Airlines 9 2026-07-22
UAL2348 United Airlines 8 2026-07-23
UAL1718 United Airlines 8 2026-07-20
UAL1431 United Airlines 8 2026-07-24
UAL1654 United Airlines 7 2026-07-22
UAL1604 United Airlines 7 2026-07-22
UAL1176 United Airlines 7 2026-07-25
UAL599 United Airlines 6 2026-07-20
UAL501 - 6 2026-07-14
UAL1022 - 6 2026-07-14
UAL635 United Airlines 5 2026-06-05
UAL2268 - 5 2026-07-20
UAL1962 United Airlines 5 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL457 BWI → SFO Jul 26, 20:35 UTCJul 26, 21:15 UTC40m
2026-07-26 UAL2814 EWR → IAH Jul 26, 14:20 UTCJul 26, 17:45 UTC3h 25m
2026-07-26 UAL2278 ORD → SEA Jul 26, 06:10 UTCJul 26, 09:50 UTC3h 41m
2026-07-25 UAL1722 OGG → SFO Jul 25, 22:37 UTCJul 26, 02:58 UTC4h 21m
2026-07-25 UAL1722 OGG → SFO Jul 25, 22:35 UTCJul 25, 22:45 UTC10m
2026-07-25 UAL1721 SFO → KOA Jul 25, 20:55 UTCJul 25, 21:05 UTC10m
2026-07-25 UAL1721 SFO → KOA Jul 25, 16:00 UTCJul 25, 16:45 UTC45m
2026-07-25 UAL1176 SJC → ORD Jul 25, 13:15 UTCJul 25, 14:00 UTC45m
2026-07-25 UAL1176 SJC → ORD Jul 25, 09:00 UTCJul 25, 09:35 UTC35m
2026-07-24 UAL1431 IAH → SNA Jul 24, 20:35 UTCJul 24, 21:00 UTC25m
2026-07-24 UAL1431 IAH → SNA Jul 24, 20:33 UTCJul 25, 01:42 UTC5h 9m
2026-07-24 UAL1868 LAX → EWR Jul 24, 13:30 UTCJul 24, 18:15 UTC4h 45m
2026-07-23 UAL347 PHL → DEN Jul 23, 20:10 UTCJul 23, 23:00 UTC2h 50m
2026-07-23 UAL2348 IAH → LGA Jul 23, 16:00 UTCJul 23, 18:05 UTC2h 5m
2026-07-23 UAL3910 HKG → SFO Jul 23, 09:17 UTCJul 23, 14:10 UTC4h 53m
2026-07-23 UAL638 MCO → ORD Jul 23, 08:15 UTCJul 23, 08:30 UTC15m
2026-07-23 UAL638 MCO → ORD Jul 23, 03:19 UTCJul 23, 08:27 UTC5h 8m
2026-07-23 UAL638 MCO → ORD Jul 23, 03:20 UTCJul 23, 04:00 UTC40m
2026-07-22 UAL2633 PHL → IAH Jul 22, 23:05 UTCJul 23, 01:35 UTC2h 30m
2026-07-22 UAL2633 PHL → IAH Jul 22, 22:11 UTCJul 23, 01:24 UTC3h 13m
2026-07-22 UAL1604 SFO → BNA Jul 22, 18:15 UTCJul 22, 20:20 UTC2h 5m
2026-07-22 UAL2391 ORD → EWR Jul 22, 14:25 UTCJul 22, 16:25 UTC2h 0m
2026-07-22 UAL2391 ORD → EWR Jul 22, 13:58 UTCJul 22, 16:21 UTC2h 23m
2026-07-22 UAL1654 OMA → SFO Jul 22, 01:20 UTCJul 22, 03:15 UTC1h 55m
2026-07-21 UAL1829 - Jul 21, 21:50 UTCJul 21, 23:40 UTC1h 50m
2026-07-21 UAL1604 SFO → DEN Jul 21, 18:15 UTCJul 21, 20:20 UTC2h 5m
2026-07-21 UAL2391 ORD → EWR Jul 21, 14:10 UTCJul 21, 16:10 UTC2h 0m
2026-07-20 UAL599 DEN → EWR Jul 20, 22:35 UTCJul 21, 01:40 UTC3h 4m
2026-07-20 UAL599 DEN → EWR Jul 20, 22:19 UTCJul 21, 01:32 UTC3h 13m
2026-07-20 UAL2268 - Jul 20, 15:35 UTCJul 20, 20:20 UTC4h 45m
2026-07-20 UAL1719 - Jul 20, 12:25 UTCJul 20, 13:10 UTC45m
2026-07-20 UAL1719 - Jul 20, 08:25 UTCJul 20, 08:35 UTC10m
2026-07-20 UAL1718 LAS → LAX Jul 20, 05:25 UTCJul 20, 05:40 UTC15m
2026-07-20 UAL1718 LAS → LAX Jul 20, 00:40 UTCJul 20, 01:05 UTC25m
2026-07-19 UAL1221 - Jul 19, 21:20 UTCJul 19, 22:10 UTC50m
2026-07-19 UAL1221 - Jul 19, 17:05 UTCJul 19, 17:20 UTC15m
2026-07-19 UAL638 MCO → ORD Jul 19, 04:10 UTCJul 19, 08:55 UTC4h 45m
2026-07-19 UAL638 MCO → ORD Jul 19, 04:09 UTCJul 19, 08:58 UTC4h 49m
2026-07-18 UAL2633 - Jul 18, 23:40 UTCJul 19, 01:45 UTC2h 5m
2026-07-18 UAL1604 - Jul 18, 18:35 UTCJul 18, 20:35 UTC2h 0m
2026-07-18 UAL2391 ORD → EWR Jul 18, 14:05 UTCJul 18, 16:15 UTC2h 10m
2026-07-17 UAL599 IAD → DEN Jul 17, 22:25 UTCJul 18, 01:39 UTC3h 15m
2026-07-17 UAL599 IAD → DEN Jul 17, 22:14 UTCJul 18, 01:31 UTC3h 17m
2026-07-17 UAL2268 - Jul 17, 15:25 UTCJul 17, 20:04 UTC4h 40m
2026-07-17 UAL1719 - Jul 17, 12:25 UTCJul 17, 13:10 UTC45m
2026-07-17 UAL1719 KOA → LAX Jul 17, 08:28 UTCJul 17, 13:04 UTC4h 36m
2026-07-17 UAL1719 - Jul 17, 08:15 UTCJul 17, 08:30 UTC15m
2026-07-17 UAL1718 - Jul 17, 05:35 UTCJul 17, 05:39 UTC5m
2026-07-17 UAL1718 - Jul 17, 00:35 UTCJul 17, 01:00 UTC25m
2026-07-16 UAL1221 - Jul 16, 17:10 UTCJul 16, 22:10 UTC5h 0m

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 Jul 26, 21:15 UTC.
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 UAL638, UAL2109, UAL1418, UAL1829, UAL1719.