sensors Mode-S transponder
A31A34
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N29968 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A31A34
- Octal
- 50615064
- Decimal
- 10,689,076
- Country
- US
- Tail
- N29968
- Type
- B789
- Flights observed
- 113
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 11h ago
Last known position
Country allocation
The ICAO 24-bit address A31A34 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 |
|---|---|---|---|
| UAL61 | United Airlines | 7 | 2026-05-17 |
| UAL2023 | United Airlines | 5 | 2026-05-22 |
| UAL893 | United Airlines | 4 | 2026-05-19 |
| UAL821 | United Airlines | 4 | 2026-05-29 |
| UAL820 | United Airlines | 4 | 2026-05-29 |
| UAL806 | United Airlines | 4 | 2026-05-09 |
| UAL79 | United Airlines | 4 | 2026-04-13 |
| UAL761 | United Airlines | 4 | 2026-04-17 |
| UAL760 | United Airlines | 4 | 2026-04-17 |
| UAL60 | United Airlines | 4 | 2026-05-16 |
| UAL29 | United Airlines | 4 | 2026-05-13 |
| UAL187 | United Airlines | 4 | 2026-05-26 |
| UAL1849 | United Airlines | 4 | 2026-05-21 |
| UAL178 | United Airlines | 4 | 2026-04-15 |
| UAL177 | United Airlines | 4 | 2026-04-15 |
| UAL263 | United Airlines | 3 | 2026-04-16 |
| UAL262 | United Airlines | 3 | 2026-04-16 |
| UAL2471 | United Airlines | 3 | 2026-04-13 |
| UAL1757 | United Airlines | 3 | 2026-05-23 |
| UAL142 | United Airlines | 3 | 2026-04-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL821 | SFO → MEX | May 29, 15:00 UTC | May 29, 15:30 UTC | 30m |
| 2026-05-29 | UAL821 | SFO → MEX | May 29, 14:10 UTC | May 29, 14:30 UTC | 20m |
| 2026-05-29 | UAL821 | SFO → MEX | May 29, 11:35 UTC | May 29, 11:50 UTC | 15m |
| 2026-05-29 | UAL821 | SFO → MEX | May 29, 09:25 UTC | May 29, 10:00 UTC | 35m |
| 2026-05-29 | UAL820 | MEX → SFO | May 29, 01:30 UTC | May 29, 02:10 UTC | 40m |
| 2026-05-28 | UAL820 | MEX → SFO | May 28, 23:55 UTC | May 29, 00:10 UTC | 15m |
| 2026-05-28 | UAL820 | MEX → SFO | May 28, 07:14 UTC | May 28, 21:29 UTC | 14h 15m |
| 2026-05-28 | UAL820 | MEX → SFO | May 28, 07:10 UTC | May 28, 21:30 UTC | 14h 20m |
| 2026-05-27 | UAL2403 | RDU → EWR | May 27, 16:20 UTC | May 27, 21:25 UTC | 5h 5m |
| 2026-05-26 | UAL187 | JNB → EWR | May 26, 20:40 UTC | May 27, 12:15 UTC | 15h 36m |
| 2026-05-26 | UAL187 | JNB → EWR | May 26, 20:39 UTC | May 27, 12:13 UTC | 15h 34m |
| 2026-05-26 | UAL188 | EWR → JNB | May 26, 01:44 UTC | May 26, 15:39 UTC | 13h 55m |
| 2026-05-25 | UAL713 | ORD → DEL | May 25, 17:35 UTC | May 25, 22:19 UTC | 4h 45m |
| 2026-05-25 | UAL870 | SYD → SFO | May 25, 01:55 UTC | May 25, 13:40 UTC | 11h 45m |
| 2026-05-24 | UAL863 | SFO → SYD | May 24, 06:25 UTC | May 24, 20:40 UTC | 14h 15m |
| 2026-05-23 | UAL1757 | PIT → DEN | May 23, 22:30 UTC | May 24, 03:40 UTC | 5h 10m |
| 2026-05-22 | UAL2023 | BOS → ORD | May 22, 18:25 UTC | May 22, 18:40 UTC | 15m |
| 2026-05-22 | UAL2023 | BOS → ORD | May 22, 18:21 UTC | May 23, 09:09 UTC | 14h 48m |
| 2026-05-22 | UAL1011 | MCI → SFO | May 22, 13:05 UTC | May 22, 13:15 UTC | 10m |
| 2026-05-21 | UAL1011 | MCI → SFO | May 21, 23:00 UTC | May 22, 00:45 UTC | 1h 45m |
| 2026-05-21 | UAL1849 | MCO → EWR | May 21, 15:45 UTC | May 21, 20:15 UTC | 4h 30m |
| 2026-05-21 | UAL1849 | MCO → EWR | May 21, 15:39 UTC | May 21, 20:14 UTC | 4h 35m |
| 2026-05-20 | UAL892 | ICN → SFO | May 20, 08:15 UTC | May 20, 18:00 UTC | 9h 45m |
| 2026-05-19 | UAL893 | SFO → ICN | May 19, 17:50 UTC | May 20, 05:59 UTC | 12h 9m |
| 2026-05-19 | UAL893 | SFO → ICN | May 19, 18:15 UTC | May 20, 06:05 UTC | 11h 51m |
| 2026-05-18 | UAL892 | ICN → SFO | May 18, 07:55 UTC | May 18, 18:00 UTC | 10h 5m |
| 2026-05-17 | UAL893 | SFO → ICN | May 17, 18:06 UTC | May 18, 05:32 UTC | 11h 26m |
| 2026-05-17 | UAL893 | SFO → ICN | May 17, 18:10 UTC | May 18, 05:35 UTC | 11h 25m |
| 2026-05-17 | UAL61 | BRU → EWR | May 17, 02:05 UTC | May 17, 15:31 UTC | 13h 25m |
| 2026-05-17 | UAL61 | BRU → EWR | May 17, 01:30 UTC | May 17, 02:00 UTC | 30m |
| 2026-05-16 | UAL60 | SFO → MEL | May 16, 07:31 UTC | May 16, 22:50 UTC | 15h 20m |
| 2026-05-14 | UAL28D | SIN → SFO | May 14, 23:45 UTC | May 15, 12:50 UTC | 13h 5m |
| 2026-05-13 | UAL29 | SFO → SIN | May 13, 18:25 UTC | May 14, 10:57 UTC | 16h 32m |
| 2026-05-13 | UAL29 | SFO → SIN | May 13, 18:45 UTC | May 14, 09:30 UTC | 14h 45m |
| 2026-05-13 | UAL61 | BRU → EWR | May 13, 01:25 UTC | May 13, 15:15 UTC | 13h 50m |
| 2026-05-12 | UAL60 | SFO → MEL | May 12, 07:15 UTC | May 12, 22:31 UTC | 15h 15m |
| 2026-05-11 | UAL1757 | PIT → DEN | May 11, 22:35 UTC | May 12, 03:25 UTC | 4h 51m |
| 2026-05-11 | UAL2023 | BOS → ORD | May 11, 09:45 UTC | May 11, 09:50 UTC | 5m |
| 2026-05-10 | UAL2023 | BOS → ORD | May 10, 18:20 UTC | May 10, 18:35 UTC | 15m |
| 2026-05-10 | UAL2023 | BOS → ORD | May 10, 18:21 UTC | May 11, 09:30 UTC | 15h 9m |
| 2026-05-09 | UAL1011 | MCI → SFO | May 9, 23:05 UTC | May 10, 13:05 UTC | 14h 0m |
| 2026-05-09 | UAL1849 | MCO → EWR | May 9, 15:35 UTC | May 9, 19:55 UTC | 4h 20m |
| 2026-05-09 | UAL806 | ICN → SFO | May 9, 03:00 UTC | May 9, 12:45 UTC | 9h 45m |
| 2026-05-09 | UAL806 | ICN → SFO | May 9, 03:01 UTC | May 9, 12:40 UTC | 9h 39m |
| 2026-05-08 | UAL805 | SFO → ICN | May 8, 07:24 UTC | May 8, 19:20 UTC | 11h 55m |
| 2026-05-07 | UAL28 | SIN → SFO | May 7, 16:25 UTC | May 7, 19:45 UTC | 3h 20m |
| 2026-05-07 | UAL28 | SIN → SFO | May 7, 13:06 UTC | May 8, 03:53 UTC | 14h 47m |
| 2026-05-07 | UAL29 | SFO → SIN | May 7, 10:05 UTC | May 7, 10:15 UTC | 10m |
| 2026-05-06 | UAL29 | SFO → SIN | May 6, 18:15 UTC | May 7, 07:30 UTC | 13h 15m |
| 2026-05-06 | UAL114 | PPT → SFO | May 6, 07:15 UTC | May 6, 14:50 UTC | 7h 35m |
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 N29968 page for operator, model, and routing details .