Apparatus

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sensors Mode-S transponder

AA44AD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76055 · BOEING 767-400 · operated by UNITED AIRLINES INC

Hex
AA44AD
Octal
52442255
Decimal
11,158,701
Country
US
Tail
N76055
Type
B764
Broadcasting now · callsign UAL261 · 32,000 ft
Flights observed
274
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 16:30 UTC

Current position

AA44AD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA44AD 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
UAL509 - 18 2026-07-22
UAL386 - 18 2026-07-12
UAL385 - 14 2026-07-12
UAL860 United Airlines 13 2026-07-25
UAL510 United Airlines 12 2026-07-22
UAL50 United Airlines 12 2026-07-26
UAL170 - 12 2026-07-09
UAL861 United Airlines 11 2026-07-24
UAL53 United Airlines 11 2026-04-27
UAL52 United Airlines 11 2026-04-26
UAL260 United Airlines 10 2026-07-25
UAL169 - 10 2026-07-10
UAL120 - 10 2026-06-18
UAL51 United Airlines 9 2026-07-22
UAL261 United Airlines 9 2026-07-23
UAL2143 United Airlines 9 2026-07-21
UAL121 - 9 2026-06-19
UAL992 United Airlines 8 2026-04-23
UAL963 United Airlines 8 2026-04-30
UAL991 United Airlines 6 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL50 MAD → EWR Jul 26, 09:10 UTCJul 26, 16:25 UTC7h 15m
2026-07-25 UAL260 ABQ → SFO Jul 25, 23:05 UTCJul 26, 06:20 UTC7h 15m
2026-07-25 UAL860 GRU → IAD Jul 25, 01:00 UTCJul 25, 10:30 UTC9h 30m
2026-07-24 UAL861 BOS → GIG Jul 24, 04:00 UTCJul 24, 13:00 UTC9h 0m
2026-07-23 UAL261 ATL → EWR Jul 23, 09:35 UTCJul 23, 17:25 UTC7h 50m
2026-07-22 UAL51 EWR → MAD Jul 22, 23:45 UTCJul 23, 06:25 UTC6h 40m
2026-07-22 UAL509 - Jul 22, 11:50 UTCJul 22, 20:35 UTC8h 45m
2026-07-22 UAL510 EWR → FCO Jul 22, 01:35 UTCJul 22, 03:10 UTC1h 35m
2026-07-21 UAL1173 - Jul 21, 21:00 UTCJul 21, 23:40 UTC2h 40m
2026-07-21 UAL1173 - Jul 21, 19:25 UTCJul 21, 19:35 UTC10m
2026-07-21 UAL2143 EWR → SJU Jul 21, 17:40 UTCJul 21, 17:55 UTC15m
2026-07-21 UAL2143 EWR → SJU Jul 21, 14:45 UTCJul 21, 15:25 UTC40m
2026-07-21 UAL3939 LAX → SFO Jul 21, 11:35 UTCJul 21, 12:15 UTC40m
2026-07-20 UAL860 - Jul 20, 01:50 UTCJul 20, 10:50 UTC9h 0m
2026-07-19 UAL861 - Jul 19, 14:25 UTCJul 19, 23:30 UTC9h 5m
2026-07-18 UAL347 DEN → IAD Jul 18, 20:12 UTCJul 18, 23:39 UTC3h 27m
2026-07-18 UAL347 DEN → IAD Jul 18, 20:10 UTCJul 18, 23:40 UTC3h 30m
2026-07-18 UAL1865 SLC → EWR Jul 18, 15:15 UTCJul 18, 18:10 UTC2h 55m
2026-07-18 UAL860 - Jul 18, 01:00 UTCJul 18, 10:20 UTC9h 21m
2026-07-18 UAL860 GRU → IAD Jul 18, 01:01 UTCJul 18, 10:19 UTC9h 18m
2026-07-17 UAL861 IAD → GRU Jul 17, 03:33 UTCJul 17, 12:25 UTC8h 52m
2026-07-17 UAL861 - Jul 17, 03:34 UTCJul 17, 08:10 UTC4h 35m
2026-07-15 UAL261 - Jul 15, 09:55 UTCJul 15, 17:55 UTC8h 0m
2026-07-15 UAL261 MAD → IAD Jul 15, 09:43 UTCJul 15, 17:58 UTC8h 15m
2026-07-14 UAL51 - Jul 14, 23:45 UTCJul 15, 06:45 UTC7h 0m
2026-07-14 UAL509 - Jul 14, 11:40 UTCJul 14, 20:30 UTC8h 50m
2026-07-14 UAL509 FCO → EWR Jul 14, 11:22 UTCJul 14, 20:28 UTC9h 6m
2026-07-14 UAL510 - Jul 14, 00:35 UTCJul 14, 08:30 UTC7h 55m
2026-07-13 UAL1173 - Jul 13, 20:15 UTCJul 13, 21:15 UTC1h 0m
2026-07-13 UAL2143 - Jul 13, 15:10 UTCJul 13, 15:35 UTC25m
2026-07-13 UAL2143 EWR → SJU Jul 13, 12:27 UTCJul 13, 15:34 UTC3h 7m
2026-07-13 UAL2143 - Jul 13, 12:10 UTCJul 13, 12:55 UTC45m
2026-07-12 UAL386 DBV → EWR Jul 12, 10:56 UTCJul 12, 19:59 UTC9h 3m
2026-07-12 UAL386 DBV → EWR Jul 12, 10:56 UTCJul 12, 19:50 UTC8h 54m
2026-07-12 UAL386 - Jul 12, 10:35 UTCJul 12, 14:05 UTC3h 30m
2026-07-12 UAL385 EWR → DBV Jul 12, 00:25 UTCJul 12, 08:49 UTC8h 24m
2026-07-12 UAL385 - Jul 12, 00:35 UTCJul 12, 02:05 UTC1h 30m
2026-07-11 UAL386 DBV → EWR Jul 11, 11:15 UTCJul 11, 20:50 UTC9h 35m
2026-07-10 UAL385 - Jul 10, 23:55 UTCJul 11, 08:10 UTC8h 15m
2026-07-10 UAL169 - Jul 10, 09:25 UTCJul 10, 18:25 UTC9h 0m
2026-07-09 UAL170 - Jul 9, 23:50 UTCJul 10, 07:15 UTC7h 25m
2026-07-09 UAL170 EWR → VCE Jul 9, 23:09 UTCJul 10, 07:15 UTC8h 6m
2026-07-09 UAL169 - Jul 9, 10:25 UTCJul 9, 18:50 UTC8h 25m
2026-07-09 UAL170 EWR → VCE Jul 9, 00:34 UTCJul 9, 08:10 UTC7h 36m
2026-07-09 UAL170 - Jul 9, 00:30 UTCJul 9, 08:15 UTC7h 45m
2026-07-07 UAL941 - Jul 7, 15:30 UTCJul 7, 16:40 UTC1h 10m
2026-07-07 UAL941 LHR → EWR Jul 7, 15:34 UTCJul 7, 22:36 UTC7h 2m
2026-07-07 UAL146 - Jul 7, 03:30 UTCJul 7, 05:05 UTC1h 35m
2026-07-07 UAL146 EWR → LHR Jul 7, 02:29 UTCJul 7, 10:00 UTC7h 31m
2026-07-06 UAL1173 SJU → EWR Jul 6, 18:50 UTCJul 6, 22:40 UTC3h 50m

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 N76055 page for operator, model, and routing details .

Mode-S AA44AD frequently asked

What is Mode-S code AA44AD?
AA44AD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76055.
Where is Mode-S AA44AD registered?
Mode-S code AA44AD 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 AA44AD broadcasting right now?
Yes. Mode-S AA44AD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA44AD, octal 52442255, decimal 11,158,701.
What flights does AA44AD operate?
Mode-S AA44AD has broadcast 20 distinct callsigns, including UAL509, UAL386, UAL385, UAL860, UAL510.