sensors Mode-S transponder
A47FD9
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N38950 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A47FD9
- Octal
- 51077731
- Decimal
- 10,780,633
- Country
- US
- Tail
- N38950
- Type
- B789
- Flights observed
- 119
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jun 11, 03:30 UTC
Last known position
Country allocation
The ICAO 24-bit address A47FD9 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 |
|---|---|---|---|
| UAL187 | United Airlines | 8 | 2026-05-16 |
| UAL821 | United Airlines | 6 | 2026-04-18 |
| UAL820 | United Airlines | 6 | 2026-04-17 |
| UAL123 | United Airlines | 5 | 2026-06-06 |
| UAL122 | United Airlines | 5 | 2026-06-05 |
| UAL761 | United Airlines | 4 | 2026-05-27 |
| UAL760 | United Airlines | 4 | 2026-05-27 |
| UAL713 | United Airlines | 4 | 2026-06-03 |
| UAL7 | United Airlines | 4 | 2026-05-20 |
| UAL62 | United Airlines | 4 | 2026-05-19 |
| UAL61 | - | 4 | 2026-04-14 |
| UAL188 | United Airlines | 4 | 2026-05-16 |
| UAL152 | United Airlines | 4 | 2026-05-12 |
| UAL83 | United Airlines | 3 | 2026-06-05 |
| UAL79 | United Airlines | 3 | 2026-05-17 |
| UAL33 | United Airlines | 3 | 2026-05-29 |
| UAL28 | United Airlines | 3 | 2026-06-09 |
| UAL2692 | United Airlines | 3 | 2026-04-15 |
| UAL263 | United Airlines | 3 | 2026-05-25 |
| UAL82 | United Airlines | 2 | 2026-06-04 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-10 | UAL3889 | MCO → EWR | Jun 10, 16:00 UTC | Jun 11, 03:30 UTC | 11h 30m |
| 2026-06-09 | UAL28 | SIN → SFO | Jun 9, 17:15 UTC | Jun 10, 04:25 UTC | 11h 10m |
| 2026-06-08 | UAL29 | SFO → SIN | Jun 8, 19:00 UTC | Jun 9, 08:20 UTC | 13h 20m |
| 2026-06-08 | UAL29 | SFO → SIN | Jun 8, 18:35 UTC | Jun 9, 10:44 UTC | 16h 9m |
| 2026-06-08 | UAL806 | ICN → SFO | Jun 8, 02:56 UTC | Jun 8, 12:19 UTC | 9h 23m |
| 2026-06-08 | UAL806 | ICN → SFO | Jun 8, 02:40 UTC | Jun 8, 12:20 UTC | 9h 40m |
| 2026-06-07 | UAL805 | SFO → ICN | Jun 7, 09:05 UTC | Jun 7, 20:55 UTC | 11h 50m |
| 2026-06-06 | UAL1227 | PHX → IAD | Jun 6, 17:40 UTC | Jun 6, 23:24 UTC | 5h 45m |
| 2026-06-06 | UAL123 | ANC → ORD | Jun 6, 06:55 UTC | Jun 6, 13:44 UTC | 6h 50m |
| 2026-06-05 | UAL122 | IAD → LHR | Jun 5, 13:50 UTC | Jun 5, 19:55 UTC | 6h 5m |
| 2026-06-05 | UAL83 | DEL → EWR | Jun 5, 00:45 UTC | Jun 5, 09:35 UTC | 8h 50m |
| 2026-06-04 | UAL83 | DEL → EWR | Jun 4, 18:35 UTC | Jun 4, 18:50 UTC | 15m |
| 2026-06-04 | UAL83 | DEL → EWR | Jun 4, 18:32 UTC | Jun 5, 09:27 UTC | 14h 55m |
| 2026-06-04 | UAL82 | EWR → DEL | Jun 4, 15:00 UTC | Jun 4, 15:25 UTC | 25m |
| 2026-06-04 | UAL82 | EWR → DEL | Jun 4, 01:35 UTC | Jun 4, 11:45 UTC | 10h 10m |
| 2026-06-03 | UAL713 | ORD → DEL | Jun 3, 17:35 UTC | Jun 3, 22:25 UTC | 4h 50m |
| 2026-06-03 | UAL870 | SYD → SFO | Jun 3, 00:50 UTC | Jun 3, 13:45 UTC | 12h 55m |
| 2026-06-02 | UAL863 | SFO → SYD | Jun 2, 06:55 UTC | Jun 2, 20:45 UTC | 13h 50m |
| 2026-06-01 | UAL1227 | PHX → IAD | Jun 1, 17:55 UTC | Jun 1, 23:50 UTC | 5h 55m |
| 2026-06-01 | UAL123 | ANC → ORD | Jun 1, 07:05 UTC | Jun 1, 13:40 UTC | 6h 35m |
| 2026-06-01 | UAL123 | ANC → ORD | Jun 1, 07:02 UTC | Jun 1, 13:41 UTC | 6h 39m |
| 2026-05-31 | UAL122 | IAD → LHR | May 31, 13:45 UTC | May 31, 19:55 UTC | 6h 10m |
| 2026-05-31 | UAL2303 | IAD → SAN | May 31, 08:25 UTC | May 31, 11:10 UTC | 2h 45m |
| 2026-05-30 | UAL199 | PVG → LAX | May 30, 13:20 UTC | May 30, 14:35 UTC | 1h 15m |
| 2026-05-30 | UAL199 | PVG → LAX | May 30, 06:40 UTC | May 30, 23:15 UTC | 16h 35m |
| 2026-05-29 | UAL198 | LAX → PVG | May 29, 20:25 UTC | May 30, 08:40 UTC | 12h 15m |
| 2026-05-29 | UAL198 | LAX → PVG | May 29, 20:31 UTC | May 30, 09:46 UTC | 13h 15m |
| 2026-05-29 | UAL33 | NRT → LAX | May 29, 08:10 UTC | May 29, 17:45 UTC | 9h 36m |
| 2026-05-28 | UAL143 | DEN → NRT | May 28, 18:05 UTC | May 29, 05:20 UTC | 11h 15m |
| 2026-05-27 | UAL761 | MUC → DEN | May 27, 14:30 UTC | May 28, 00:40 UTC | 10h 10m |
| 2026-05-27 | UAL760 | DEN → MUC | May 27, 02:49 UTC | May 27, 12:05 UTC | 9h 16m |
| 2026-05-26 | UAL761 | MUC → DEN | May 26, 14:30 UTC | May 27, 00:34 UTC | 10h 5m |
| 2026-05-26 | UAL760 | DEN → MUC | May 26, 02:55 UTC | May 26, 12:11 UTC | 9h 16m |
| 2026-05-26 | UAL760 | DEN → MUC | May 26, 03:00 UTC | May 26, 04:39 UTC | 1h 40m |
| 2026-05-25 | UAL263 | EWR → PBI | May 25, 14:20 UTC | May 25, 23:40 UTC | 9h 20m |
| 2026-05-25 | UAL262 | DEN → LHR | May 25, 03:05 UTC | May 25, 11:25 UTC | 8h 20m |
| 2026-05-24 | UAL761 | MUC → DEN | May 24, 14:30 UTC | May 24, 23:46 UTC | 9h 16m |
| 2026-05-24 | UAL761 | MUC → DEN | May 24, 14:31 UTC | May 25, 00:33 UTC | 10h 2m |
| 2026-05-24 | UAL760 | DEN → MUC | May 24, 02:40 UTC | May 24, 11:55 UTC | 9h 15m |
| 2026-05-23 | UAL263 | EWR → PBI | May 23, 14:14 UTC | May 23, 23:12 UTC | 8h 58m |
| 2026-05-23 | UAL262 | DEN → LHR | May 23, 03:35 UTC | May 23, 11:40 UTC | 8h 5m |
| 2026-05-22 | UAL263 | EWR → PBI | May 22, 16:40 UTC | May 23, 01:20 UTC | 8h 40m |
| 2026-05-22 | UAL27 | DEN → LHR | May 22, 00:15 UTC | May 22, 03:50 UTC | 3h 35m |
| 2026-05-21 | UAL27 | DEN → LHR | May 21, 23:58 UTC | May 22, 08:33 UTC | 8h 35m |
| 2026-05-21 | UAL142 | NRT → DEN | May 21, 09:00 UTC | May 21, 19:05 UTC | 10h 5m |
| 2026-05-20 | UAL7 | IAH → NRT | May 20, 17:10 UTC | May 21, 06:15 UTC | 13h 5m |
| 2026-05-20 | UAL7 | IAH → NRT | May 20, 17:12 UTC | May 21, 06:53 UTC | 13h 41m |
| 2026-05-20 | UAL63 | GRU → IAH | May 20, 01:35 UTC | May 20, 10:55 UTC | 9h 21m |
| 2026-05-19 | UAL62 | IAH → GRU | May 19, 01:50 UTC | May 19, 10:15 UTC | 8h 25m |
| 2026-05-19 | UAL62 | IAH → GRU | May 19, 01:43 UTC | May 19, 10:17 UTC | 8h 34m |
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 N38950 page for operator, model, and routing details .