Apparatus

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sensors Mode-S transponder

A8B75F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N66056 · BOEING 767-400 · operated by UNITED AIRLINES INC

Hex
A8B75F
Octal
52133537
Decimal
11,056,991
Country
US
Tail
N66056
Type
B764
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
273
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S A8B75F.

Country allocation

The ICAO 24-bit address A8B75F 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
UAL50 - 19 2026-07-12
UAL51 - 18 2026-07-09
UAL169 - 18 2026-07-14
UAL121 - 17 2026-06-21
UAL260 - 15 2026-07-11
UAL120 - 14 2026-06-20
UAL170 - 13 2026-07-13
UAL261 - 12 2026-07-09
UAL2143 United Airlines 12 2026-07-24
UAL509 United Airlines 10 2026-07-26
UAL385 - 9 2026-07-19
UAL1173 United Airlines 9 2026-07-24
UAL53 United Airlines 8 2026-04-29
UAL386 - 8 2026-07-19
UAL861 - 7 2026-07-10
UAL510 United Airlines 6 2026-07-26
UAL735 United Airlines 5 2026-07-22
UAL52 United Airlines 5 2026-04-28
UAL331 United Airlines 5 2026-06-07
UAL330 United Airlines 5 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL509 DEN → SFO Jul 26, 11:35 UTCJul 26, 11:45 UTC10m
2026-07-26 UAL509 DEN → SFO Jul 26, 11:22 UTCJul 26, 20:41 UTC9h 19m
2026-07-26 UAL510 EWR → FCO Jul 26, 00:30 UTCJul 26, 08:25 UTC7h 56m
2026-07-25 UAL17 LHR → EWR Jul 25, 09:45 UTCJul 25, 17:15 UTC7h 30m
2026-07-25 UAL17 LHR → EWR Jul 25, 09:40 UTCJul 25, 17:12 UTC7h 32m
2026-07-25 UAL904 EWR → LHR Jul 25, 00:40 UTCJul 25, 07:20 UTC6h 40m
2026-07-25 UAL904 EWR → LHR Jul 25, 00:20 UTCJul 25, 07:10 UTC6h 50m
2026-07-24 UAL1173 SJU → EWR Jul 24, 17:40 UTCJul 24, 21:20 UTC3h 40m
2026-07-24 UAL1173 SJU → EWR Jul 24, 17:39 UTCJul 24, 21:16 UTC3h 37m
2026-07-24 UAL2143 EWR → SJU Jul 24, 15:25 UTCJul 24, 15:45 UTC20m
2026-07-24 UAL2143 EWR → SJU Jul 24, 12:15 UTCJul 24, 13:15 UTC1h 0m
2026-07-23 UAL736 CMH → IAH Jul 23, 08:10 UTCJul 23, 17:35 UTC9h 25m
2026-07-22 UAL735 IAD → EWR Jul 22, 21:38 UTCJul 23, 05:35 UTC7h 57m
2026-07-22 UAL735 IAD → EWR Jul 22, 21:20 UTCJul 22, 21:45 UTC25m
2026-07-22 UAL3032 IAH → EWR Jul 22, 18:00 UTCJul 22, 19:05 UTC1h 5m
2026-07-21 UAL237 BOS → IAH Jul 21, 20:30 UTCJul 21, 20:55 UTC25m
2026-07-21 UAL237 BOS → IAH Jul 21, 11:45 UTCJul 21, 20:55 UTC9h 10m
2026-07-21 UAL237 BOS → IAH Jul 21, 11:06 UTCJul 21, 20:15 UTC9h 9m
2026-07-21 UAL236 BWI → ORD Jul 21, 01:35 UTCJul 21, 03:10 UTC1h 35m
2026-07-21 UAL236 BWI → ORD Jul 21, 01:23 UTCJul 21, 08:54 UTC7h 31m
2026-07-20 UAL273 - Jul 20, 14:10 UTCJul 20, 15:45 UTC1h 35m
2026-07-20 UAL273 NCE → EWR Jul 20, 13:50 UTCJul 20, 22:12 UTC8h 22m
2026-07-20 UAL273 NCE → EWR Jul 20, 13:50 UTCJul 20, 22:18 UTC8h 28m
2026-07-20 UAL272 EWR → NCE Jul 20, 03:55 UTCJul 20, 11:25 UTC7h 30m
2026-07-19 UAL386 - Jul 19, 14:15 UTCJul 20, 00:05 UTC9h 50m
2026-07-19 UAL386 DBV → EWR Jul 19, 14:21 UTCJul 20, 00:04 UTC9h 43m
2026-07-19 UAL385 EWR → DBV Jul 19, 03:45 UTCJul 19, 12:15 UTC8h 30m
2026-07-18 UAL509 - Jul 18, 11:40 UTCJul 18, 20:30 UTC8h 50m
2026-07-18 UAL509 FCO → EWR Jul 18, 11:52 UTCJul 18, 20:25 UTC8h 33m
2026-07-18 UAL510 - Jul 18, 00:55 UTCJul 18, 08:45 UTC7h 51m
2026-07-17 UAL3908 SYD → SFO Jul 17, 15:00 UTCJul 17, 22:05 UTC7h 5m
2026-07-17 UAL940 EWR → LHR Jul 17, 06:35 UTCJul 17, 13:05 UTC6h 30m
2026-07-15 UAL386 DBV → EWR Jul 15, 10:25 UTCJul 15, 19:45 UTC9h 20m
2026-07-14 UAL385 EWR → DBV Jul 14, 23:35 UTCJul 15, 08:00 UTC8h 25m
2026-07-14 UAL169 - Jul 14, 09:25 UTCJul 14, 17:55 UTC8h 30m
2026-07-13 UAL170 - Jul 13, 23:35 UTCJul 14, 07:15 UTC7h 40m
2026-07-13 UAL169 - Jul 13, 09:25 UTCJul 13, 09:45 UTC20m
2026-07-13 UAL169 VCE → EWR Jul 13, 09:29 UTCJul 13, 18:01 UTC8h 32m
2026-07-13 UAL169 VCE → EWR Jul 13, 09:29 UTCJul 13, 17:57 UTC8h 28m
2026-07-12 UAL170 EWR → VCE Jul 12, 22:55 UTCJul 13, 06:25 UTC7h 30m
2026-07-12 UAL50 - Jul 12, 09:20 UTCJul 12, 16:45 UTC7h 25m
2026-07-11 UAL260 IAD → MAD Jul 11, 22:36 UTCJul 12, 05:47 UTC7h 11m
2026-07-11 UAL260 IAD → MAD Jul 11, 22:40 UTCJul 12, 05:45 UTC7h 5m
2026-07-11 UAL860 - Jul 11, 00:45 UTCJul 11, 10:10 UTC9h 25m
2026-07-10 UAL861 - Jul 10, 03:40 UTCJul 10, 12:55 UTC9h 15m
2026-07-09 UAL261 MAD → IAD Jul 9, 09:43 UTCJul 9, 17:47 UTC8h 4m
2026-07-09 UAL51 EWR → MAD Jul 9, 00:15 UTCJul 9, 06:55 UTC6h 40m
2026-07-09 UAL51 - Jul 9, 00:05 UTCJul 9, 07:00 UTC6h 55m
2026-07-08 UAL963 - Jul 8, 11:45 UTCJul 8, 19:55 UTC8h 10m
2026-07-08 UAL963 BER → EWR Jul 8, 11:51 UTCJul 8, 19:53 UTC8h 2m

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 N66056 page for operator, model, and routing details .

Mode-S A8B75F frequently asked

What is Mode-S code A8B75F?
A8B75F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N66056.
Where is Mode-S A8B75F registered?
Mode-S code A8B75F 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 A8B75F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B75F, octal 52133537, decimal 11,056,991.
What flights does A8B75F operate?
Mode-S A8B75F has broadcast 20 distinct callsigns, including UAL50, UAL51, UAL169, UAL121, UAL260.