sensors Mode-S transponder
A31A76
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N29984 · BOEING 787-9 Dreamliner · operated by WILMINGTON TRUST CO TRUSTEE
- Hex
- A31A76
- Octal
- 50615166
- Decimal
- 10,689,142
- Country
- US
- Tail
- N29984
- Type
- B789
- Flights observed
- 109
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 53m ago
Last known position
Country allocation
The ICAO 24-bit address A31A76 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 |
|---|---|---|---|
| UAL263 | United Airlines | 6 | 2026-05-10 |
| UAL78 | United Airlines | 5 | 2026-04-13 |
| UAL262 | United Airlines | 5 | 2026-05-10 |
| UAL178 | United Airlines | 5 | 2026-05-12 |
| UAL1227 | United Airlines | 5 | 2026-05-20 |
| UAL761 | United Airlines | 4 | 2026-05-09 |
| UAL760 | United Airlines | 4 | 2026-05-09 |
| UAL27 | United Airlines | 4 | 2026-05-11 |
| UAL182 | United Airlines | 4 | 2026-05-03 |
| UAL181 | United Airlines | 4 | 2026-05-04 |
| UAL863 | United Airlines | 3 | 2026-05-21 |
| UAL806 | United Airlines | 3 | 2026-05-25 |
| UAL805 | United Airlines | 3 | 2026-05-24 |
| UAL771 | United Airlines | 3 | 2026-05-15 |
| UAL713 | United Airlines | 3 | 2026-05-28 |
| UAL7 | United Airlines | 3 | 2026-04-13 |
| UAL29 | United Airlines | 3 | 2026-05-23 |
| UAL26 | United Airlines | 3 | 2026-05-11 |
| UAL177 | United Airlines | 3 | 2026-05-12 |
| UAL153 | United Airlines | 3 | 2026-05-18 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL187 | JNB → EWR | May 29, 20:00 UTC | May 29, 23:15 UTC | 3h 15m |
| 2026-05-29 | UAL188 | EWR → JNB | May 29, 01:50 UTC | May 29, 15:40 UTC | 13h 50m |
| 2026-05-28 | UAL713 | ORD → DEL | May 28, 17:35 UTC | May 28, 22:25 UTC | 4h 50m |
| 2026-05-28 | UAL61 | BRU → EWR | May 28, 01:09 UTC | May 28, 14:49 UTC | 13h 40m |
| 2026-05-28 | UAL61 | BRU → EWR | May 28, 01:05 UTC | May 28, 01:30 UTC | 25m |
| 2026-05-27 | UAL60 | SFO → MEL | May 27, 07:45 UTC | May 27, 22:20 UTC | 14h 35m |
| 2026-05-26 | UAL1757 | PIT → DEN | May 26, 22:29 UTC | May 27, 03:29 UTC | 5h 0m |
| 2026-05-26 | UAL1849 | MCO → EWR | May 26, 16:05 UTC | May 26, 20:34 UTC | 4h 30m |
| 2026-05-25 | UAL806 | ICN → SFO | May 25, 02:40 UTC | May 25, 12:40 UTC | 10h 0m |
| 2026-05-24 | UAL805 | SFO → ICN | May 24, 08:40 UTC | May 24, 20:45 UTC | 12h 5m |
| 2026-05-23 | UAL28 | SIN → SFO | May 23, 15:30 UTC | May 24, 04:05 UTC | 12h 36m |
| 2026-05-23 | UAL28 | SIN → SFO | May 23, 13:26 UTC | May 24, 04:00 UTC | 14h 34m |
| 2026-05-23 | UAL29 | SFO → SIN | May 23, 10:45 UTC | May 23, 10:55 UTC | 10m |
| 2026-05-22 | UAL29 | SFO → SIN | May 22, 18:35 UTC | May 23, 10:53 UTC | 16h 18m |
| 2026-05-22 | UAL29 | SFO → SIN | May 22, 19:10 UTC | May 23, 08:10 UTC | 12h 59m |
| 2026-05-22 | UAL870 | SYD → SFO | May 22, 00:45 UTC | May 22, 13:50 UTC | 13h 5m |
| 2026-05-21 | UAL863 | SFO → SYD | May 21, 06:25 UTC | May 21, 21:00 UTC | 14h 35m |
| 2026-05-20 | UAL1227 | PHX → IAD | May 20, 17:50 UTC | May 20, 23:20 UTC | 5h 30m |
| 2026-05-20 | UAL123 | ANC → ORD | May 20, 07:05 UTC | May 20, 14:05 UTC | 7h 0m |
| 2026-05-20 | UAL123 | ANC → ORD | May 20, 07:02 UTC | May 20, 14:05 UTC | 7h 3m |
| 2026-05-19 | UAL122 | IAD → LHR | May 19, 13:55 UTC | May 19, 20:10 UTC | 6h 15m |
| 2026-05-18 | UAL1855 | ORD → BOS | May 18, 20:35 UTC | May 19, 01:25 UTC | 4h 50m |
| 2026-05-18 | UAL153 | HKG → LAX | May 18, 05:45 UTC | May 18, 17:20 UTC | 11h 35m |
| 2026-05-18 | UAL153 | HKG → LAX | May 18, 04:51 UTC | May 18, 05:05 UTC | 15m |
| 2026-05-18 | UAL153 | HKG → LAX | May 18, 01:50 UTC | May 18, 02:15 UTC | 25m |
| 2026-05-17 | UAL152 | LAX → HKG | May 17, 12:55 UTC | May 17, 13:15 UTC | 20m |
| 2026-05-17 | UAL152 | LAX → HKG | May 17, 10:30 UTC | May 17, 10:55 UTC | 25m |
| 2026-05-16 | UAL152 | LAX → HKG | May 16, 19:45 UTC | May 17, 10:00 UTC | 14h 15m |
| 2026-05-15 | UAL772 | DEN → DFW | May 15, 17:35 UTC | May 16, 15:50 UTC | 22h 16m |
| 2026-05-15 | UAL772 | DEN → DFW | May 15, 16:40 UTC | May 16, 15:31 UTC | 22h 51m |
| 2026-05-15 | UAL771 | BNA → ORD | May 15, 10:30 UTC | May 16, 07:20 UTC | 20h 50m |
| 2026-05-15 | UAL771 | BNA → ORD | May 15, 07:35 UTC | May 16, 07:20 UTC | 23h 45m |
| 2026-05-15 | UAL771 | BNA → ORD | May 15, 06:20 UTC | May 16, 05:30 UTC | 23h 9m |
| 2026-05-14 | UAL33 | NRT → LAX | May 14, 13:50 UTC | May 14, 23:20 UTC | 9h 30m |
| 2026-05-14 | UAL33 | NRT → LAX | May 14, 13:45 UTC | May 14, 23:11 UTC | 9h 26m |
| 2026-05-14 | UAL143 | DEN → NRT | May 14, 00:54 UTC | May 14, 11:39 UTC | 10h 45m |
| 2026-05-14 | UAL143 | DEN → NRT | May 14, 00:55 UTC | May 14, 11:35 UTC | 10h 40m |
| 2026-05-12 | UAL178 | KIX → GUM | May 12, 12:40 UTC | May 12, 13:30 UTC | 50m |
| 2026-05-12 | UAL178 | KIX → GUM | May 12, 12:47 UTC | May 12, 23:34 UTC | 10h 47m |
| 2026-05-12 | UAL177 | GUM → KIX | May 12, 06:50 UTC | May 12, 09:30 UTC | 2h 40m |
| 2026-05-11 | UAL26 | LHR → DEN | May 11, 11:30 UTC | May 11, 20:35 UTC | 9h 5m |
| 2026-05-11 | UAL27 | DEN → LHR | May 11, 01:10 UTC | May 11, 09:30 UTC | 8h 20m |
| 2026-05-10 | UAL263 | EWR → PBI | May 10, 14:20 UTC | May 10, 15:24 UTC | 1h 5m |
| 2026-05-10 | UAL263 | EWR → PBI | May 10, 14:14 UTC | May 10, 23:05 UTC | 8h 51m |
| 2026-05-10 | UAL262 | DEN → LHR | May 10, 02:56 UTC | May 10, 11:06 UTC | 8h 10m |
| 2026-05-10 | UAL262 | DEN → LHR | May 10, 02:50 UTC | May 10, 11:05 UTC | 8h 15m |
| 2026-05-09 | UAL761 | MUC → DEN | May 9, 14:25 UTC | May 10, 00:30 UTC | 10h 5m |
| 2026-05-09 | UAL760 | DEN → MUC | May 9, 02:40 UTC | May 9, 12:05 UTC | 9h 25m |
| 2026-05-08 | UAL761 | MUC → DEN | May 8, 14:25 UTC | May 9, 00:10 UTC | 9h 45m |
| 2026-05-08 | UAL760 | DEN → MUC | May 8, 02:39 UTC | May 8, 11:55 UTC | 9h 15m |
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 N29984 page for operator, model, and routing details .