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
- 112
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 13h ago
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 |
|---|---|---|---|
| UAL821 | United Airlines | 8 | 2026-05-24 |
| UAL820 | United Airlines | 6 | 2026-05-24 |
| UAL842 | United Airlines | 5 | 2026-05-26 |
| UAL32 | United Airlines | 5 | 2026-04-30 |
| UAL839 | United Airlines | 4 | 2026-05-25 |
| UAL83 | United Airlines | 4 | 2026-05-18 |
| UAL27 | United Airlines | 4 | 2026-04-18 |
| UAL181 | United Airlines | 4 | 2026-04-17 |
| UAL82 | United Airlines | 3 | 2026-05-18 |
| UAL78 | United Airlines | 3 | 2026-05-13 |
| UAL3731 | United Airlines | 3 | 2026-04-26 |
| UAL353 | United Airlines | 3 | 2026-05-22 |
| UAL2096 | United Airlines | 3 | 2026-05-26 |
| UAL182 | United Airlines | 3 | 2026-04-17 |
| UAL153 | United Airlines | 3 | 2026-04-14 |
| UAL152 | United Airlines | 3 | 2026-04-13 |
| UAL143 | United Airlines | 3 | 2026-05-12 |
| UAL142 | United Airlines | 3 | 2026-04-16 |
| UAL123 | United Airlines | 3 | 2026-05-17 |
| UAL870 | United Airlines | 2 | 2026-05-05 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL1593 | LGA → DEN | May 29, 13:50 UTC | May 29, 18:45 UTC | 4h 55m |
| 2026-05-28 | UAL2222 | IAD → CPT | May 28, 18:10 UTC | May 28, 18:35 UTC | 25m |
| 2026-05-28 | UAL2222 | IAD → CPT | May 28, 18:12 UTC | May 29, 09:25 UTC | 15h 13m |
| 2026-05-28 | UAL1122 | EWR → CPT | May 28, 01:06 UTC | May 28, 14:39 UTC | 13h 33m |
| 2026-05-28 | UAL1122 | EWR → CPT | May 28, 00:55 UTC | May 28, 14:40 UTC | 13h 45m |
| 2026-05-26 | UAL2096 | LAX → EWR | May 26, 16:55 UTC | May 26, 21:29 UTC | 4h 35m |
| 2026-05-26 | UAL842 | SYD → LAX | May 26, 01:14 UTC | May 26, 14:24 UTC | 13h 10m |
| 2026-05-25 | UAL839 | LAX → SYD | May 25, 06:00 UTC | May 25, 20:24 UTC | 14h 24m |
| 2026-05-24 | UAL821 | SFO → MEX | May 24, 13:55 UTC | May 25, 03:00 UTC | 13h 5m |
| 2026-05-24 | UAL821 | SFO → MEX | May 24, 09:05 UTC | May 24, 09:30 UTC | 25m |
| 2026-05-24 | UAL821 | SFO → MEX | May 24, 09:05 UTC | May 24, 11:25 UTC | 2h 20m |
| 2026-05-24 | UAL820 | MEX → SFO | May 24, 01:30 UTC | May 24, 02:05 UTC | 35m |
| 2026-05-23 | UAL820 | MEX → SFO | May 23, 23:55 UTC | May 24, 00:00 UTC | 5m |
| 2026-05-23 | UAL820 | MEX → SFO | May 23, 07:14 UTC | May 23, 21:27 UTC | 14h 13m |
| 2026-05-23 | UAL820 | MEX → SFO | May 23, 07:20 UTC | May 23, 21:25 UTC | 14h 5m |
| 2026-05-22 | UAL353 | SAN → EWR | May 22, 23:25 UTC | May 23, 04:30 UTC | 5h 4m |
| 2026-05-22 | UAL2096 | LAX → EWR | May 22, 16:30 UTC | May 22, 20:55 UTC | 4h 25m |
| 2026-05-22 | UAL353 | SAN → EWR | May 22, 01:05 UTC | May 22, 06:20 UTC | 5h 15m |
| 2026-05-21 | UAL2096 | LAX → EWR | May 21, 16:20 UTC | May 21, 20:55 UTC | 4h 35m |
| 2026-05-21 | UAL842 | SYD → LAX | May 21, 00:05 UTC | May 21, 12:35 UTC | 12h 30m |
| 2026-05-20 | UAL842 | SYD → LAX | May 20, 23:56 UTC | May 21, 12:32 UTC | 12h 36m |
| 2026-05-20 | UAL839 | LAX → SYD | May 20, 06:20 UTC | May 20, 21:00 UTC | 14h 40m |
| 2026-05-19 | UAL2692 | IAD → PHL | May 19, 13:45 UTC | May 19, 19:05 UTC | 5h 20m |
| 2026-05-18 | UAL83 | DEL → EWR | May 18, 18:35 UTC | May 19, 09:50 UTC | 15h 15m |
| 2026-05-18 | UAL82 | EWR → DEL | May 18, 01:20 UTC | May 18, 15:20 UTC | 14h 0m |
| 2026-05-17 | UAL123 | ANC → ORD | May 17, 06:50 UTC | May 17, 13:55 UTC | 7h 5m |
| 2026-05-16 | UAL122 | IAD → LHR | May 16, 13:55 UTC | May 16, 20:00 UTC | 6h 5m |
| 2026-05-15 | UAL1855 | ORD → BOS | May 15, 20:35 UTC | May 16, 01:05 UTC | 4h 30m |
| 2026-05-15 | UAL2692 | IAD → PHL | May 15, 13:40 UTC | May 15, 18:35 UTC | 4h 54m |
| 2026-05-14 | UAL83 | DEL → EWR | May 14, 18:40 UTC | May 15, 10:10 UTC | 15h 30m |
| 2026-05-14 | UAL83 | DEL → EWR | May 14, 18:42 UTC | May 15, 10:09 UTC | 15h 27m |
| 2026-05-14 | UAL82 | EWR → DEL | May 14, 01:15 UTC | May 14, 15:20 UTC | 14h 5m |
| 2026-05-13 | UAL78 | NRT → EWR | May 13, 08:40 UTC | May 13, 20:40 UTC | 12h 0m |
| 2026-05-12 | UAL143 | DEN → NRT | May 12, 17:59 UTC | May 13, 05:11 UTC | 11h 12m |
| 2026-05-12 | UAL143 | DEN → NRT | May 12, 18:00 UTC | May 13, 05:10 UTC | 11h 10m |
| 2026-05-11 | UAL178 | KIX → GUM | May 11, 16:25 UTC | May 12, 03:10 UTC | 10h 45m |
| 2026-05-10 | UAL177 | GUM → KIX | May 10, 23:50 UTC | May 11, 09:50 UTC | 10h 0m |
| 2026-05-10 | UAL3932 | EWR → IAD | May 10, 18:25 UTC | May 10, 21:50 UTC | 3h 25m |
| 2026-05-10 | UAL3932 | EWR → IAD | May 10, 18:15 UTC | May 10, 21:30 UTC | 3h 15m |
| 2026-05-10 | UAL2303 | IAD → SAN | May 10, 06:20 UTC | May 10, 10:45 UTC | 4h 25m |
| 2026-05-09 | UAL353 | SAN → EWR | May 9, 22:55 UTC | May 10, 04:09 UTC | 5h 15m |
| 2026-05-08 | UAL713 | ORD → DEL | May 8, 18:10 UTC | May 8, 22:40 UTC | 4h 30m |
| 2026-05-08 | UAL61 | BRU → EWR | May 8, 01:59 UTC | May 8, 15:50 UTC | 13h 50m |
| 2026-05-07 | UAL60 | SFO → MEL | May 7, 07:05 UTC | May 7, 22:42 UTC | 15h 37m |
| 2026-05-07 | UAL60 | SFO → MEL | May 7, 07:15 UTC | May 7, 12:10 UTC | 4h 55m |
| 2026-05-06 | UAL28 | SIN → SFO | May 6, 14:50 UTC | May 7, 04:35 UTC | 13h 44m |
| 2026-05-06 | UAL28 | SIN → SFO | May 6, 08:50 UTC | May 7, 04:35 UTC | 19h 44m |
| 2026-05-05 | UAL29 | SFO → SIN | May 5, 18:40 UTC | May 6, 16:20 UTC | 21h 40m |
| 2026-05-05 | UAL870 | SYD → SFO | May 5, 00:45 UTC | May 5, 13:43 UTC | 12h 58m |
| 2026-05-05 | UAL870 | SYD → SFO | May 5, 00:45 UTC | May 5, 13:45 UTC | 13h 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 .