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
- Flights observed
- 58
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2d ago
Last known position
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 | 7 | 2026-05-10 |
| UAL918 | United Airlines | 7 | 2026-05-05 |
| UAL943 | United Airlines | 5 | 2026-05-13 |
| UAL942 | United Airlines | 5 | 2026-05-13 |
| UAL914 | United Airlines | 5 | 2026-05-16 |
| UAL819 | United Airlines | 3 | 2026-05-24 |
| UAL818 | United Airlines | 3 | 2026-05-25 |
| UAL160 | United Airlines | 3 | 2026-05-23 |
| UAL915 | United Airlines | 2 | 2026-05-16 |
| UAL853 | United Airlines | 2 | 2026-05-21 |
| UAL852 | United Airlines | 2 | 2026-05-22 |
| UAL194 | United Airlines | 2 | 2026-05-22 |
| UAL990 | United Airlines | 1 | 2026-04-28 |
| UAL939 | United Airlines | 1 | 2026-05-20 |
| UAL930 | United Airlines | 1 | 2026-05-20 |
| UAL880 | United Airlines | 1 | 2026-05-09 |
| UAL879 | United Airlines | 1 | 2026-05-06 |
| UAL507 | United Airlines | 1 | 2026-05-27 |
| UAL47 | United Airlines | 1 | 2026-05-07 |
| UAL46 | United Airlines | 1 | 2026-05-06 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-27 | UAL507 | DEN → LGA | May 27, 00:34 UTC | May 27, 12:05 UTC | 11h 31m |
| 2026-05-26 | UAL195 | MUC → SFO | May 26, 09:55 UTC | May 26, 21:09 UTC | 11h 15m |
| 2026-05-25 | UAL102 | IAH → MUC | May 25, 22:19 UTC | May 26, 07:45 UTC | 9h 25m |
| 2026-05-25 | UAL818 | EZE → IAH | May 25, 04:00 UTC | May 25, 10:10 UTC | 6h 10m |
| 2026-05-24 | UAL819 | IAH → EZE | May 24, 02:30 UTC | May 24, 11:35 UTC | 9h 5m |
| 2026-05-23 | UAL160 | MUC → IAH | May 23, 10:40 UTC | May 23, 14:10 UTC | 3h 30m |
| 2026-05-23 | UAL160 | MUC → IAH | May 23, 10:39 UTC | May 23, 21:34 UTC | 10h 55m |
| 2026-05-23 | UAL160 | MUC → IAH | May 23, 10:39 UTC | May 23, 21:38 UTC | 10h 59m |
| 2026-05-22 | UAL194 | SFO → MUC | May 22, 21:28 UTC | May 23, 08:28 UTC | 11h 0m |
| 2026-05-22 | UAL194 | SFO → MUC | May 22, 21:50 UTC | May 23, 08:30 UTC | 10h 40m |
| 2026-05-22 | UAL852 | TPE → SAN | May 22, 17:35 UTC | May 22, 18:15 UTC | 40m |
| 2026-05-22 | UAL852 | TPE → SAN | May 22, 06:45 UTC | May 22, 07:00 UTC | 15m |
| 2026-05-21 | UAL853 | SFO → TPE | May 21, 19:30 UTC | May 21, 19:50 UTC | 20m |
| 2026-05-21 | UAL853 | SFO → TPE | May 21, 06:55 UTC | May 21, 07:15 UTC | 20m |
| 2026-05-20 | UAL939 | LHR → SFO | May 20, 15:40 UTC | May 21, 01:55 UTC | 10h 15m |
| 2026-05-20 | UAL930 | SFO → LHR | May 20, 02:40 UTC | May 20, 12:35 UTC | 9h 56m |
| 2026-05-17 | UAL3902 | TPA → ORD | May 17, 16:15 UTC | May 17, 21:25 UTC | 5h 10m |
| 2026-05-16 | UAL914 | CDG → IAD | May 16, 11:16 UTC | May 16, 13:01 UTC | 1h 45m |
| 2026-05-16 | UAL914 | CDG → IAD | May 16, 11:24 UTC | May 16, 18:55 UTC | 7h 31m |
| 2026-05-16 | UAL915 | IAD → CDG | May 16, 00:26 UTC | May 16, 07:51 UTC | 7h 25m |
| 2026-05-16 | UAL915 | IAD → CDG | May 16, 00:45 UTC | May 16, 07:55 UTC | 7h 11m |
| 2026-05-13 | UAL943 | LIS → IAD | May 13, 12:10 UTC | May 13, 19:33 UTC | 7h 23m |
| 2026-05-13 | UAL943 | LIS → IAD | May 13, 12:05 UTC | May 13, 19:35 UTC | 7h 30m |
| 2026-05-13 | UAL942 | IAD → LIS | May 13, 03:20 UTC | May 13, 09:15 UTC | 5h 55m |
| 2026-05-13 | UAL942 | IAD → LIS | May 13, 02:48 UTC | May 13, 09:42 UTC | 6h 54m |
| 2026-05-12 | UAL943 | LIS → IAD | May 12, 12:23 UTC | May 12, 19:22 UTC | 6h 59m |
| 2026-05-12 | UAL943 | LIS → IAD | May 12, 12:25 UTC | May 12, 19:20 UTC | 6h 55m |
| 2026-05-12 | UAL942 | IAD → LIS | May 12, 03:05 UTC | May 12, 09:40 UTC | 6h 35m |
| 2026-05-12 | UAL942 | IAD → LIS | May 12, 02:59 UTC | May 12, 09:35 UTC | 6h 36m |
| 2026-05-11 | UAL943 | LIS → IAD | May 11, 11:40 UTC | May 11, 19:05 UTC | 7h 25m |
| 2026-05-11 | UAL942 | IAD → LIS | May 11, 03:00 UTC | May 11, 09:40 UTC | 6h 40m |
| 2026-05-10 | UAL919 | LHR → IAD | May 10, 11:35 UTC | May 10, 19:15 UTC | 7h 40m |
| 2026-05-10 | UAL919 | LHR → IAD | May 10, 11:40 UTC | May 10, 19:00 UTC | 7h 20m |
| 2026-05-09 | UAL880 | IAH → LHR | May 9, 21:50 UTC | May 10, 06:35 UTC | 8h 45m |
| 2026-05-09 | UAL818 | EZE → IAH | May 9, 04:10 UTC | May 9, 10:00 UTC | 5h 50m |
| 2026-05-09 | UAL818 | EZE → IAH | May 9, 00:25 UTC | May 9, 00:40 UTC | 15m |
| 2026-05-08 | UAL819 | IAH → EZE | May 8, 01:49 UTC | May 8, 11:09 UTC | 9h 20m |
| 2026-05-08 | UAL819 | IAH → EZE | May 8, 01:48 UTC | May 8, 11:03 UTC | 9h 15m |
| 2026-05-07 | UAL47 | FRA → IAH | May 7, 12:10 UTC | May 7, 22:45 UTC | 10h 35m |
| 2026-05-06 | UAL46 | IAH → FRA | May 6, 23:50 UTC | May 7, 08:55 UTC | 9h 5m |
| 2026-05-06 | UAL879 | LHR → IAH | May 6, 09:25 UTC | May 6, 19:20 UTC | 9h 54m |
| 2026-05-05 | UAL918 | IAD → LHR | May 5, 22:51 UTC | May 6, 05:39 UTC | 6h 48m |
| 2026-05-05 | UAL918 | IAD → LHR | May 5, 22:50 UTC | May 6, 05:50 UTC | 7h 0m |
| 2026-05-05 | UAL919 | LHR → IAD | May 5, 11:40 UTC | May 5, 19:05 UTC | 7h 25m |
| 2026-05-04 | UAL918 | IAD → LHR | May 4, 22:51 UTC | May 5, 05:47 UTC | 6h 56m |
| 2026-05-04 | UAL918 | IAD → LHR | May 4, 22:50 UTC | May 5, 05:55 UTC | 7h 5m |
| 2026-05-01 | UAL919 | LHR → IAD | May 1, 11:55 UTC | May 1, 19:10 UTC | 7h 15m |
| 2026-04-30 | UAL918 | IAD → LHR | Apr 30, 23:11 UTC | May 1, 06:00 UTC | 6h 49m |
| 2026-04-30 | UAL918 | IAD → LHR | Apr 30, 23:00 UTC | May 1, 06:10 UTC | 7h 10m |
| 2026-04-30 | UAL919 | LHR → IAD | Apr 30, 11:25 UTC | Apr 30, 12:35 UTC | 1h 10m |
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 .