Apparatus

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sensors Mode-S transponder

AAA125

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N784UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AAA125
Octal
52520445
Decimal
11,182,373
Country
US
Tail
N784UA
Type
B772
No current signal · last broadcast Jul 26, 19:05 UTC
Flights observed
165
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:05 UTC

Last known position

Most recent position reported by Mode-S AAA125.

Country allocation

The ICAO 24-bit address AAA125 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
UAL919 United Airlines 13 2026-07-26
UAL880 United Airlines 10 2026-07-25
UAL918 United Airlines 9 2026-07-19
UAL818 - 8 2026-07-17
UAL879 United Airlines 7 2026-07-25
UAL819 - 7 2026-07-16
UAL943 - 6 2026-07-09
UAL942 - 6 2026-07-09
UAL925 - 6 2026-07-08
UAL914 - 6 2026-07-14
UAL149 - 6 2026-07-01
UAL915 - 4 2026-07-10
UAL47 - 4 2026-07-23
UAL46 United Airlines 4 2026-07-23
UAL160 - 4 2026-07-04
UAL148 - 4 2026-07-02
UAL984 - 3 2026-07-13
UAL924 - 3 2026-07-15
UAL57 - 3 2026-07-12
UAL5 United Airlines 3 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL919 LHR → IAD Jul 26, 11:30 UTCJul 26, 19:05 UTC7h 35m
2026-07-25 UAL880 IAH → LHR Jul 25, 22:20 UTCJul 26, 07:10 UTC8h 51m
2026-07-25 UAL880 IAH → LHR Jul 25, 22:22 UTCJul 26, 07:01 UTC8h 39m
2026-07-25 UAL879 LHR → IAH Jul 25, 10:45 UTCJul 25, 20:10 UTC9h 25m
2026-07-25 UAL879 LHR → IAH Jul 25, 09:25 UTCJul 25, 20:05 UTC10h 40m
2026-07-24 UAL880 IAH → LHR Jul 24, 21:50 UTCJul 25, 06:35 UTC8h 45m
2026-07-23 UAL47 - Jul 23, 12:40 UTCJul 23, 22:50 UTC10h 10m
2026-07-23 UAL46 IAH → FRA Jul 23, 01:10 UTCJul 23, 10:25 UTC9h 15m
2026-07-21 UAL4 LHR → IAH Jul 21, 13:40 UTCJul 21, 23:15 UTC9h 35m
2026-07-21 UAL5 IAH → LHR Jul 21, 01:30 UTCJul 21, 10:20 UTC8h 50m
2026-07-20 UAL47 - Jul 20, 12:45 UTCJul 20, 22:40 UTC9h 55m
2026-07-20 UAL46 - Jul 20, 00:40 UTCJul 20, 10:10 UTC9h 30m
2026-07-19 UAL879 - Jul 19, 13:05 UTCJul 19, 22:15 UTC9h 10m
2026-07-19 UAL918 IAD → LHR Jul 19, 03:40 UTCJul 19, 10:55 UTC7h 15m
2026-07-19 UAL918 IAD → LHR Jul 19, 03:41 UTCJul 19, 10:51 UTC7h 10m
2026-07-19 UAL919 RDU → IAD Jul 19, 00:00 UTCJul 19, 00:50 UTC50m
2026-07-18 UAL919 RDU → IAD Jul 18, 23:40 UTCJul 19, 00:52 UTC1h 12m
2026-07-18 UAL919 - Jul 18, 19:25 UTCJul 18, 20:20 UTC55m
2026-07-18 UAL919 LHR → IAD Jul 18, 11:40 UTCJul 18, 19:08 UTC7h 28m
2026-07-18 UAL919 - Jul 18, 11:50 UTCJul 18, 13:10 UTC1h 20m
2026-07-18 UAL880 - Jul 18, 07:05 UTCJul 18, 07:10 UTC5m
2026-07-17 UAL880 - Jul 17, 22:05 UTCJul 18, 07:10 UTC9h 6m
2026-07-17 UAL880 IAH → LHR Jul 17, 21:57 UTCJul 18, 06:47 UTC8h 50m
2026-07-17 UAL818 - Jul 17, 00:25 UTCJul 17, 01:15 UTC50m
2026-07-17 UAL818 EZE → IAH Jul 17, 00:26 UTCJul 17, 10:02 UTC9h 36m
2026-07-17 UAL818 EZE → IAH Jul 17, 00:26 UTCJul 17, 10:05 UTC9h 39m
2026-07-16 UAL819 - Jul 16, 01:45 UTCJul 16, 10:59 UTC9h 15m
2026-07-16 UAL819 IAH → EZE Jul 16, 01:41 UTCJul 16, 10:52 UTC9h 11m
2026-07-15 UAL4 - Jul 15, 13:05 UTCJul 15, 22:35 UTC9h 30m
2026-07-15 UAL924 IAD → LHR Jul 15, 03:05 UTCJul 15, 10:10 UTC7h 5m
2026-07-14 UAL914 - Jul 14, 10:35 UTCJul 14, 18:05 UTC7h 30m
2026-07-13 UAL990 SFO → CDG Jul 13, 22:20 UTCJul 14, 08:10 UTC9h 50m
2026-07-13 UAL984 - Jul 13, 07:45 UTCJul 13, 18:35 UTC10h 50m
2026-07-13 UAL984 CDG → SFO Jul 13, 07:39 UTCJul 13, 18:23 UTC10h 44m
2026-07-12 UAL57 EWR → CDG Jul 12, 22:13 UTCJul 13, 04:30 UTC6h 17m
2026-07-12 UAL57 EWR → CDG Jul 12, 22:00 UTCJul 13, 04:35 UTC6h 35m
2026-07-12 UAL18 MXP → EWR Jul 12, 08:40 UTCJul 12, 16:35 UTC7h 55m
2026-07-11 UAL19 EWR → MXP Jul 11, 22:08 UTCJul 12, 05:08 UTC7h 0m
2026-07-11 UAL19 EWR → MXP Jul 11, 22:05 UTCJul 12, 05:10 UTC7h 5m
2026-07-11 UAL56 - Jul 11, 08:05 UTCJul 11, 15:50 UTC7h 45m
2026-07-11 UAL56 CDG → EWR Jul 11, 08:09 UTCJul 11, 15:46 UTC7h 37m
2026-07-10 UAL915 IAD → CDG Jul 10, 22:46 UTCJul 11, 05:26 UTC6h 40m
2026-07-10 UAL915 IAD → CDG Jul 10, 22:45 UTCJul 11, 05:31 UTC6h 45m
2026-07-10 UAL885 - Jul 10, 09:25 UTCJul 10, 18:50 UTC9h 25m
2026-07-09 UAL884 IAD → FCO Jul 9, 22:35 UTCJul 10, 07:00 UTC8h 25m
2026-07-09 UAL943 LIS → IAD Jul 9, 11:25 UTCJul 9, 19:10 UTC7h 45m
2026-07-09 UAL942 IAD → LIS Jul 9, 03:05 UTCJul 9, 09:30 UTC6h 25m
2026-07-08 UAL925 - Jul 8, 15:55 UTCJul 8, 17:10 UTC1h 15m
2026-07-08 UAL925 LHR → IAD Jul 8, 16:04 UTCJul 8, 23:14 UTC7h 10m
2026-07-08 UAL5 - Jul 8, 03:00 UTCJul 8, 11:40 UTC8h 40m

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 N784UA page for operator, model, and routing details .

Mode-S AAA125 frequently asked

What is Mode-S code AAA125?
AAA125 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N784UA.
Where is Mode-S AAA125 registered?
Mode-S code AAA125 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 AAA125 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAA125, octal 52520445, decimal 11,182,373.
What flights does AAA125 operate?
Mode-S AAA125 has broadcast 20 distinct callsigns, including UAL919, UAL880, UAL918, UAL818, UAL879.