Apparatus

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sensors Mode-S transponder

AA44AC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76054 · BOEING 767-400 · operated by UNITED AIRLINES INC

Hex
AA44AC
Octal
52442254
Decimal
11,158,700
Country
US
Tail
N76054
Type
B764
No current signal · last broadcast Jul 25, 17:40 UTC
Flights observed
263
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 17:40 UTC

Last known position

Most recent position reported by Mode-S AA44AC.

Country allocation

The ICAO 24-bit address AA44AC 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
UAL170 United Airlines 17 2026-07-23
UAL50 United Airlines 15 2026-07-21
UAL261 United Airlines 14 2026-07-25
UAL169 United Airlines 14 2026-07-24
UAL1173 - 13 2026-07-16
UAL260 - 12 2026-07-20
UAL861 - 11 2026-06-30
UAL51 United Airlines 11 2026-07-24
UAL860 - 10 2026-07-01
UAL510 - 9 2026-07-13
UAL2143 - 9 2026-07-15
UAL884 United Airlines 8 2026-04-17
UAL748 - 8 2026-06-26
UAL509 - 8 2026-07-13
UAL885 United Airlines 7 2026-04-17
UAL749 - 7 2026-06-27
UAL53 United Airlines 7 2026-05-14
UAL31 United Airlines 6 2026-06-12
UAL121 United Airlines 6 2026-06-05
UAL120 United Airlines 6 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL261 ATL → EWR Jul 25, 09:55 UTCJul 25, 11:10 UTC1h 15m
2026-07-25 UAL261 ATL → EWR Jul 25, 09:43 UTCJul 25, 17:36 UTC7h 53m
2026-07-24 UAL51 EWR → MAD Jul 24, 23:45 UTCJul 25, 06:50 UTC7h 5m
2026-07-24 UAL169 VCE → EWR Jul 24, 09:25 UTCJul 24, 17:40 UTC8h 15m
2026-07-23 UAL170 EWR → VCE Jul 23, 23:19 UTCJul 24, 06:55 UTC7h 36m
2026-07-23 UAL170 EWR → VCE Jul 23, 23:20 UTCJul 24, 00:50 UTC1h 30m
2026-07-23 UAL169 VCE → EWR Jul 23, 09:25 UTCJul 23, 18:25 UTC9h 0m
2026-07-23 UAL169 VCE → EWR Jul 23, 09:29 UTCJul 23, 18:22 UTC8h 53m
2026-07-22 UAL170 EWR → VCE Jul 22, 23:09 UTCJul 23, 06:29 UTC7h 20m
2026-07-22 UAL170 EWR → VCE Jul 22, 22:55 UTCJul 23, 05:00 UTC6h 5m
2026-07-22 UAL237 BOS → IAH Jul 22, 10:20 UTCJul 22, 16:35 UTC6h 15m
2026-07-21 UAL236 BWI → ORD Jul 21, 21:03 UTCJul 22, 04:37 UTC7h 34m
2026-07-21 UAL236 BWI → ORD Jul 21, 21:30 UTCJul 22, 04:45 UTC7h 15m
2026-07-21 UAL50 MAD → EWR Jul 21, 09:15 UTCJul 21, 16:25 UTC7h 10m
2026-07-21 UAL50 MAD → EWR Jul 21, 09:18 UTCJul 21, 16:36 UTC7h 18m
2026-07-20 UAL260 IAD → MAD Jul 20, 22:36 UTCJul 21, 05:45 UTC7h 9m
2026-07-20 UAL260 - Jul 20, 22:40 UTCJul 21, 05:55 UTC7h 15m
2026-07-20 UAL261 - Jul 20, 09:35 UTCJul 20, 17:25 UTC7h 50m
2026-07-19 UAL260 - Jul 19, 22:55 UTCJul 20, 05:55 UTC7h 0m
2026-07-17 UAL261 MAD → IAD Jul 17, 09:50 UTCJul 17, 17:44 UTC7h 55m
2026-07-17 UAL261 MAD → IAD Jul 17, 09:43 UTCJul 17, 17:43 UTC8h 0m
2026-07-16 UAL51 EWR → MAD Jul 16, 23:50 UTCJul 17, 06:07 UTC6h 17m
2026-07-16 UAL51 - Jul 16, 23:44 UTCJul 17, 06:20 UTC6h 35m
2026-07-16 UAL1173 SJU → EWR Jul 16, 17:39 UTCJul 16, 21:02 UTC3h 23m
2026-07-16 UAL1173 EWR → EWR Jul 16, 12:14 UTCJul 16, 21:05 UTC8h 50m
2026-07-15 UAL1173 PHL → EWR Jul 15, 23:35 UTCJul 16, 00:10 UTC35m
2026-07-15 UAL1173 - Jul 15, 20:05 UTCJul 15, 21:45 UTC1h 40m
2026-07-15 UAL1173 - Jul 15, 17:40 UTCJul 15, 17:50 UTC10m
2026-07-15 UAL2143 - Jul 15, 15:00 UTCJul 15, 15:20 UTC20m
2026-07-15 UAL2143 EWR → SJU Jul 15, 12:27 UTCJul 15, 15:18 UTC2h 51m
2026-07-15 UAL2143 - Jul 15, 12:05 UTCJul 15, 12:10 UTC5m
2026-07-14 UAL271 - Jul 14, 12:05 UTCJul 14, 18:20 UTC6h 15m
2026-07-14 UAL270 - Jul 14, 04:10 UTCJul 14, 09:45 UTC5h 35m
2026-07-13 UAL509 - Jul 13, 11:10 UTCJul 13, 20:15 UTC9h 5m
2026-07-13 UAL510 EWR → FCO Jul 13, 00:46 UTCJul 13, 08:19 UTC7h 33m
2026-07-13 UAL510 - Jul 13, 00:35 UTCJul 13, 08:25 UTC7h 50m
2026-07-12 UAL1173 - Jul 12, 20:25 UTCJul 12, 21:25 UTC1h 0m
2026-07-12 UAL1173 - Jul 12, 18:01 UTCJul 12, 18:15 UTC15m
2026-07-12 UAL1173 SJU → EWR Jul 12, 18:04 UTCJul 12, 21:19 UTC3h 15m
2026-07-12 UAL2143 - Jul 12, 12:20 UTCJul 12, 15:45 UTC3h 25m
2026-07-10 UAL386 DBV → EWR Jul 10, 10:25 UTCJul 10, 20:00 UTC9h 35m
2026-07-10 UAL385 EWR → DBV Jul 10, 00:20 UTCJul 10, 08:22 UTC8h 2m
2026-07-10 UAL385 - Jul 10, 00:15 UTCJul 10, 01:00 UTC45m
2026-07-09 UAL736 - Jul 9, 12:15 UTCJul 9, 15:00 UTC2h 45m
2026-07-09 UAL736 PMO → EWR Jul 9, 11:33 UTCJul 9, 21:14 UTC9h 41m
2026-07-09 UAL735 - Jul 9, 00:55 UTCJul 9, 09:15 UTC8h 20m
2026-07-08 UAL1173 - Jul 8, 21:20 UTCJul 8, 22:25 UTC1h 5m
2026-07-08 UAL1173 - Jul 8, 19:00 UTCJul 8, 19:10 UTC10m
2026-07-08 UAL1173 SJU → EWR Jul 8, 19:11 UTCJul 8, 22:21 UTC3h 10m
2026-07-08 UAL2143 - Jul 8, 17:10 UTCJul 8, 17:35 UTC25m

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 N76054 page for operator, model, and routing details .

Mode-S AA44AC frequently asked

What is Mode-S code AA44AC?
AA44AC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76054.
Where is Mode-S AA44AC registered?
Mode-S code AA44AC 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 AA44AC broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 17:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA44AC, octal 52442254, decimal 11,158,700.
What flights does AA44AC operate?
Mode-S AA44AC has broadcast 20 distinct callsigns, including UAL170, UAL50, UAL261, UAL169, UAL1173.