Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A8B75A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N66051 · BOEING 767-400 · operated by UNITED AIRLINES INC

Hex
A8B75A
Octal
52133532
Decimal
11,056,986
Country
US
Tail
N66051
Type
B764
No current signal · last broadcast 5d ago
Flights observed
224
Distinct callsigns
20
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A8B75A.

Country allocation

The ICAO 24-bit address A8B75A 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
UAL260 United Airlines 16 2026-07-02
UAL50 - 14 2026-07-03
UAL386 United Airlines 12 2026-06-12
UAL261 - 12 2026-07-05
UAL385 United Airlines 11 2026-06-12
UAL169 United Airlines 11 2026-06-09
UAL510 - 10 2026-06-28
UAL51 - 10 2026-07-05
UAL2143 - 9 2026-06-20
UAL170 United Airlines 9 2026-06-08
UAL885 - 8 2026-04-14
UAL121 United Airlines 8 2026-05-25
UAL884 United Airlines 7 2026-04-14
UAL861 - 7 2026-07-06
UAL71 United Airlines 7 2026-05-17
UAL509 United Airlines 7 2026-06-28
UAL30 United Airlines 7 2026-04-18
UAL120 United Airlines 7 2026-05-25
UAL1173 United Airlines 7 2026-06-20
UAL860 - 6 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 UAL3921 - Jul 8, 14:30 UTCJul 8, 23:30 UTC9h 0m
2026-07-08 UAL3921 IAD → GIG Jul 8, 13:20 UTCJul 8, 23:28 UTC10h 8m
2026-07-07 UAL860 - Jul 7, 01:05 UTCJul 7, 10:20 UTC9h 15m
2026-07-06 UAL861 - Jul 6, 05:30 UTCJul 6, 14:35 UTC9h 5m
2026-07-05 UAL261 - Jul 5, 13:35 UTCJul 5, 21:10 UTC7h 35m
2026-07-05 UAL261 MAD → IAD Jul 5, 13:35 UTCJul 5, 21:13 UTC7h 38m
2026-07-05 UAL51 - Jul 5, 04:55 UTCJul 5, 11:15 UTC6h 20m
2026-07-04 UAL736 - Jul 4, 10:10 UTCJul 4, 10:30 UTC20m
2026-07-04 UAL736 PMO → EWR Jul 4, 09:58 UTCJul 4, 19:23 UTC9h 25m
2026-07-04 UAL736 PMO → EWR Jul 4, 09:58 UTCJul 4, 19:14 UTC9h 16m
2026-07-03 UAL735 - Jul 3, 23:45 UTCJul 4, 07:45 UTC8h 0m
2026-07-03 UAL735 EWR → PMO Jul 3, 22:28 UTCJul 4, 07:42 UTC9h 14m
2026-07-03 UAL50 - Jul 3, 09:15 UTCJul 3, 10:20 UTC1h 5m
2026-07-03 UAL50 MAD → EWR Jul 3, 09:18 UTCJul 3, 16:52 UTC7h 34m
2026-07-02 UAL260 ABQ → SFO Jul 2, 22:35 UTCJul 3, 06:00 UTC7h 25m
2026-07-02 UAL860 - Jul 2, 00:45 UTCJul 2, 09:55 UTC9h 10m
2026-07-01 UAL861 IAD → GRU Jul 1, 03:18 UTCJul 1, 12:19 UTC9h 1m
2026-07-01 UAL861 - Jul 1, 03:20 UTCJul 1, 07:50 UTC4h 30m
2026-06-29 UAL261 - Jun 29, 09:34 UTCJun 29, 10:29 UTC55m
2026-06-29 UAL261 MAD → IAD Jun 29, 09:43 UTCJun 29, 17:37 UTC7h 54m
2026-06-28 UAL51 EWR → MAD Jun 28, 23:50 UTCJun 29, 06:10 UTC6h 20m
2026-06-28 UAL51 - Jun 28, 23:44 UTCJun 29, 06:14 UTC6h 30m
2026-06-28 UAL509 DEN → SFO Jun 28, 11:19 UTCJun 28, 12:29 UTC1h 10m
2026-06-28 UAL509 DEN → SFO Jun 28, 11:22 UTCJun 28, 20:19 UTC8h 57m
2026-06-28 UAL510 EWR → FCO Jun 28, 00:46 UTCJun 28, 08:08 UTC7h 22m
2026-06-28 UAL510 - Jun 28, 00:45 UTCJun 28, 08:19 UTC7h 35m
2026-06-27 UAL509 DEN → SFO Jun 27, 11:20 UTCJun 27, 20:19 UTC9h 0m
2026-06-27 UAL509 DEN → SFO Jun 27, 11:22 UTCJun 27, 20:17 UTC8h 55m
2026-06-27 UAL510 - Jun 27, 00:39 UTCJun 27, 08:20 UTC7h 40m
2026-06-26 UAL509 DEN → SFO Jun 26, 11:24 UTCJun 26, 20:34 UTC9h 10m
2026-06-26 UAL510 EWR → FCO Jun 26, 00:46 UTCJun 26, 08:36 UTC7h 50m
2026-06-26 UAL510 - Jun 26, 00:59 UTCJun 26, 08:45 UTC7h 45m
2026-06-25 UAL50 - Jun 25, 09:29 UTCJun 25, 17:30 UTC8h 0m
2026-06-25 UAL50 MAD → EWR Jun 25, 09:28 UTCJun 25, 17:32 UTC8h 4m
2026-06-24 UAL260 ABQ → SFO Jun 24, 22:25 UTCJun 25, 05:20 UTC6h 55m
2026-06-24 UAL860 GRU → IAD Jun 24, 01:14 UTCJun 24, 10:25 UTC9h 10m
2026-06-23 UAL861 BOS → GIG Jun 23, 03:07 UTCJun 23, 12:35 UTC9h 28m
2026-06-23 UAL861 BOS → GIG Jun 23, 03:25 UTCJun 23, 04:00 UTC35m
2026-06-21 UAL261 - Jun 21, 09:40 UTCJun 21, 17:54 UTC8h 15m
2026-06-21 UAL51 - Jun 21, 00:19 UTCJun 21, 06:50 UTC6h 30m
2026-06-20 UAL1173 SJU → EWR Jun 20, 20:20 UTCJun 20, 21:14 UTC55m
2026-06-20 UAL1173 SJU → EWR Jun 20, 17:34 UTCJun 20, 17:49 UTC15m
2026-06-20 UAL2143 - Jun 20, 15:34 UTCJun 20, 15:54 UTC20m
2026-06-20 UAL2143 - Jun 20, 12:14 UTCJun 20, 13:59 UTC1h 45m
2026-06-14 UAL50 MAD → EWR Jun 14, 09:20 UTCJun 14, 16:50 UTC7h 30m
2026-06-13 UAL260 ABQ → SFO Jun 13, 22:40 UTCJun 14, 05:50 UTC7h 10m
2026-06-13 UAL260 ABQ → SFO Jun 13, 22:36 UTCJun 14, 05:45 UTC7h 9m
2026-06-13 UAL261 ATL → EWR Jun 13, 11:20 UTCJun 13, 19:00 UTC7h 40m
2026-06-13 UAL261 ATL → EWR Jun 13, 10:23 UTCJun 13, 18:58 UTC8h 35m
2026-06-13 UAL51 - Jun 13, 01:20 UTCJun 13, 08:05 UTC6h 44m

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 N66051 page for operator, model, and routing details .

Mode-S A8B75A frequently asked

What is Mode-S code A8B75A?
A8B75A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N66051.
Where is Mode-S A8B75A registered?
Mode-S code A8B75A 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 A8B75A broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B75A, octal 52133532, decimal 11,056,986.
What flights does A8B75A operate?
Mode-S A8B75A has broadcast 20 distinct callsigns, including UAL260, UAL50, UAL386, UAL261, UAL385.