sensors Mode-S transponder
A47FDE
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N38955 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A47FDE
- Octal
- 51077736
- Decimal
- 10,780,638
- Country
- US
- Tail
- N38955
- Type
- B789
- Flights observed
- 185
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 16:40 UTC
Last known position
Country allocation
The ICAO 24-bit address A47FDE 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 |
|---|---|---|---|
| UAL32 | United Airlines | 9 | 2026-07-17 |
| UAL821 | United Airlines | 8 | 2026-05-24 |
| UAL820 | United Airlines | 6 | 2026-05-24 |
| UAL181 | United Airlines | 6 | 2026-07-22 |
| UAL842 | United Airlines | 5 | 2026-05-26 |
| UAL839 | - | 5 | 2026-07-10 |
| UAL83 | - | 5 | 2026-07-14 |
| UAL27 | United Airlines | 5 | 2026-07-23 |
| UAL187 | - | 5 | 2026-07-12 |
| UAL142 | - | 5 | 2026-07-21 |
| UAL82 | - | 4 | 2026-07-14 |
| UAL62 | United Airlines | 4 | 2026-07-19 |
| UAL2692 | - | 4 | 2026-07-15 |
| UAL263 | United Airlines | 4 | 2026-07-25 |
| UAL1011 | - | 4 | 2026-06-18 |
| UAL99 | - | 3 | 2026-06-26 |
| UAL98 | United Airlines | 3 | 2026-06-25 |
| UAL870 | - | 3 | 2026-07-11 |
| UAL78 | United Airlines | 3 | 2026-05-13 |
| UAL713 | - | 3 | 2026-07-11 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL761 | MUC → DEN | Jul 26, 14:40 UTC | Jul 26, 16:40 UTC | 2h 0m |
| 2026-07-26 | UAL760 | DEN → MUC | Jul 26, 03:25 UTC | Jul 26, 12:30 UTC | 9h 6m |
| 2026-07-25 | UAL263 | EWR → PBI | Jul 25, 14:09 UTC | Jul 25, 23:16 UTC | 9h 7m |
| 2026-07-25 | UAL263 | EWR → PBI | Jul 25, 14:09 UTC | Jul 25, 23:32 UTC | 9h 23m |
| 2026-07-25 | UAL263 | EWR → PBI | Jul 25, 14:05 UTC | Jul 25, 15:20 UTC | 1h 15m |
| 2026-07-25 | UAL262 | DEN → LHR | Jul 25, 03:20 UTC | Jul 25, 11:40 UTC | 8h 20m |
| 2026-07-24 | UAL178 | KIX → GUM | Jul 24, 13:15 UTC | Jul 24, 23:55 UTC | 10h 40m |
| 2026-07-24 | UAL177 | GUM → KIX | Jul 24, 00:10 UTC | Jul 24, 09:55 UTC | 9h 45m |
| 2026-07-23 | UAL26 | LHR → DEN | Jul 23, 11:10 UTC | Jul 23, 20:20 UTC | 9h 10m |
| 2026-07-23 | UAL27 | DEN → LHR | Jul 23, 00:25 UTC | Jul 23, 08:55 UTC | 8h 30m |
| 2026-07-22 | UAL181 | FRA → DEN | Jul 22, 09:41 UTC | Jul 22, 19:28 UTC | 9h 47m |
| 2026-07-21 | UAL181 | FRA → DEN | Jul 21, 22:15 UTC | Jul 22, 19:30 UTC | 21h 15m |
| 2026-07-21 | UAL142 | - | Jul 21, 07:55 UTC | Jul 21, 18:10 UTC | 10h 15m |
| 2026-07-21 | UAL142 | NRT → DEN | Jul 21, 07:50 UTC | Jul 21, 18:02 UTC | 10h 12m |
| 2026-07-20 | UAL7 | IAH → NRT | Jul 20, 16:05 UTC | Jul 21, 04:50 UTC | 12h 45m |
| 2026-07-20 | UAL63 | GRU → IAH | Jul 20, 00:55 UTC | Jul 20, 10:15 UTC | 9h 20m |
| 2026-07-19 | UAL62 | IAH → GRU | Jul 19, 00:10 UTC | Jul 19, 09:15 UTC | 9h 5m |
| 2026-07-19 | UAL62 | IAH → GRU | Jul 19, 00:13 UTC | Jul 19, 09:13 UTC | 9h 0m |
| 2026-07-18 | UAL6 | - | Jul 18, 08:10 UTC | Jul 18, 20:00 UTC | 11h 50m |
| 2026-07-17 | UAL32 | LAX → NRT | Jul 17, 18:15 UTC | Jul 18, 04:31 UTC | 10h 16m |
| 2026-07-17 | UAL32 | LAX → NRT | Jul 17, 18:25 UTC | Jul 18, 04:25 UTC | 10h 1m |
| 2026-07-16 | UAL935 | - | Jul 16, 12:25 UTC | Jul 16, 22:45 UTC | 10h 20m |
| 2026-07-15 | UAL923 | - | Jul 15, 22:55 UTC | Jul 16, 08:55 UTC | 10h 0m |
| 2026-07-15 | UAL2692 | - | Jul 15, 14:00 UTC | Jul 15, 18:30 UTC | 4h 30m |
| 2026-07-14 | UAL83 | - | Jul 14, 18:45 UTC | Jul 15, 10:00 UTC | 15h 14m |
| 2026-07-14 | UAL82 | - | Jul 14, 02:10 UTC | Jul 14, 16:05 UTC | 13h 55m |
| 2026-07-12 | UAL187 | - | Jul 12, 20:05 UTC | Jul 12, 23:15 UTC | 3h 10m |
| 2026-07-12 | UAL187 | JNB → EWR | Jul 12, 20:19 UTC | Jul 13, 11:11 UTC | 14h 52m |
| 2026-07-12 | UAL187 | JNB → EWR | Jul 12, 20:19 UTC | Jul 13, 11:20 UTC | 15h 1m |
| 2026-07-12 | UAL188 | - | Jul 12, 02:10 UTC | Jul 12, 16:05 UTC | 13h 55m |
| 2026-07-11 | UAL713 | - | Jul 11, 18:10 UTC | Jul 11, 23:00 UTC | 4h 50m |
| 2026-07-11 | UAL870 | - | Jul 11, 00:45 UTC | Jul 11, 13:55 UTC | 13h 10m |
| 2026-07-10 | UAL839 | - | Jul 10, 06:20 UTC | Jul 10, 20:35 UTC | 14h 15m |
| 2026-07-09 | UAL935 | - | Jul 9, 12:35 UTC | Jul 9, 22:50 UTC | 10h 15m |
| 2026-07-08 | UAL923 | - | Jul 8, 22:50 UTC | Jul 9, 08:45 UTC | 9h 55m |
| 2026-07-08 | UAL2692 | - | Jul 8, 13:45 UTC | Jul 8, 18:25 UTC | 4h 40m |
| 2026-07-08 | UAL3916 | - | Jul 8, 02:00 UTC | Jul 8, 04:45 UTC | 2h 45m |
| 2026-06-30 | UAL63 | - | Jun 30, 03:10 UTC | Jun 30, 12:30 UTC | 9h 20m |
| 2026-06-28 | UAL62 | - | Jun 28, 00:04 UTC | Jun 28, 07:29 UTC | 7h 25m |
| 2026-06-28 | UAL62 | IAH → GRU | Jun 28, 00:03 UTC | Jun 28, 08:55 UTC | 8h 52m |
| 2026-06-27 | UAL6 | - | Jun 27, 08:20 UTC | Jun 27, 19:55 UTC | 11h 35m |
| 2026-06-26 | UAL32 | LAX → NRT | Jun 26, 18:15 UTC | Jun 27, 05:30 UTC | 11h 15m |
| 2026-06-26 | UAL32 | - | Jun 26, 18:24 UTC | Jun 27, 05:35 UTC | 11h 10m |
| 2026-06-26 | UAL99 | - | Jun 26, 00:59 UTC | Jun 26, 14:05 UTC | 13h 5m |
| 2026-06-26 | UAL99 | - | Jun 26, 00:20 UTC | Jun 26, 00:50 UTC | 30m |
| 2026-06-25 | UAL98 | LAX → MEL | Jun 25, 05:55 UTC | Jun 25, 21:20 UTC | 15h 25m |
| 2026-06-24 | UAL99 | - | Jun 24, 00:09 UTC | Jun 24, 13:30 UTC | 13h 20m |
| 2026-06-23 | UAL98 | LAX → MEL | Jun 23, 05:54 UTC | Jun 23, 19:29 UTC | 13h 35m |
| 2026-06-23 | UAL98 | LAX → MEL | Jun 23, 05:59 UTC | Jun 23, 21:26 UTC | 15h 27m |
| 2026-06-22 | UAL2403 | - | Jun 22, 16:24 UTC | Jun 22, 21:25 UTC | 5h 0m |
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 N38955 page for operator, model, and routing details .