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
- 237
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 23:00 UTC
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 | - | 14 | 2026-07-15 |
| UAL820 | United Airlines | 12 | 2026-07-22 |
| UAL60 | - | 11 | 2026-07-14 |
| UAL821 | United Airlines | 10 | 2026-07-22 |
| UAL29 | - | 8 | 2026-07-12 |
| UAL82 | United Airlines | 7 | 2026-07-26 |
| UAL893 | - | 6 | 2026-07-06 |
| UAL187 | United Airlines | 6 | 2026-07-24 |
| UAL892 | - | 5 | 2026-07-07 |
| UAL839 | - | 5 | 2026-06-18 |
| UAL83 | United Airlines | 5 | 2026-07-26 |
| UAL806 | United Airlines | 5 | 2026-06-09 |
| UAL28 | - | 5 | 2026-07-12 |
| UAL2023 | United Airlines | 5 | 2026-05-22 |
| UAL199 | United Airlines | 5 | 2026-06-06 |
| UAL1849 | - | 5 | 2026-07-13 |
| UAL115 | - | 5 | 2026-07-10 |
| UAL969 | - | 4 | 2026-07-08 |
| UAL870 | - | 4 | 2026-06-26 |
| UAL863 | - | 4 | 2026-06-25 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL83 | DEL → EWR | Jul 26, 18:15 UTC | Jul 26, 23:00 UTC | 4h 45m |
| 2026-07-26 | UAL82 | EWR → DEL | Jul 26, 01:48 UTC | Jul 26, 15:34 UTC | 13h 46m |
| 2026-07-26 | UAL82 | EWR → DEL | Jul 26, 01:50 UTC | Jul 26, 15:30 UTC | 13h 41m |
| 2026-07-24 | UAL187 | JNB → EWR | Jul 24, 20:05 UTC | Jul 25, 11:30 UTC | 15h 25m |
| 2026-07-24 | UAL187 | JNB → EWR | Jul 24, 20:19 UTC | Jul 25, 11:24 UTC | 15h 5m |
| 2026-07-24 | UAL188 | EWR → JNB | Jul 24, 02:15 UTC | Jul 24, 16:25 UTC | 14h 10m |
| 2026-07-23 | UAL2096 | LAX → EWR | Jul 23, 15:41 UTC | Jul 23, 20:13 UTC | 4h 32m |
| 2026-07-23 | UAL2096 | - | Jul 23, 15:40 UTC | Jul 23, 20:20 UTC | 4h 40m |
| 2026-07-22 | UAL821 | SFO → MEX | Jul 22, 14:10 UTC | Jul 23, 03:05 UTC | 12h 55m |
| 2026-07-22 | UAL821 | SFO → MEX | Jul 22, 11:10 UTC | Jul 22, 11:30 UTC | 20m |
| 2026-07-22 | UAL820 | MEX → SFO | Jul 22, 00:00 UTC | Jul 22, 02:15 UTC | 2h 15m |
| 2026-07-21 | UAL820 | MEX → SFO | Jul 21, 07:10 UTC | Jul 21, 18:25 UTC | 11h 15m |
| 2026-07-21 | UAL820 | MEX → SFO | Jul 21, 07:14 UTC | Jul 21, 20:47 UTC | 13h 33m |
| 2026-07-20 | UAL821 | SFO → MEX | Jul 20, 14:10 UTC | Jul 20, 17:20 UTC | 3h 10m |
| 2026-07-20 | UAL821 | SFO → MEX | Jul 20, 14:06 UTC | Jul 21, 03:28 UTC | 13h 22m |
| 2026-07-20 | UAL821 | SFO → MEX | Jul 20, 11:00 UTC | Jul 20, 11:20 UTC | 20m |
| 2026-07-20 | UAL821 | SFO → MEX | Jul 20, 09:00 UTC | Jul 20, 09:30 UTC | 30m |
| 2026-07-20 | UAL820 | MEX → SFO | Jul 20, 03:05 UTC | Jul 20, 03:25 UTC | 20m |
| 2026-07-20 | UAL820 | MEX → SFO | Jul 20, 01:10 UTC | Jul 20, 01:25 UTC | 15m |
| 2026-07-20 | UAL820 | MEX → SFO | Jul 20, 00:51 UTC | Jul 20, 03:15 UTC | 2h 24m |
| 2026-07-19 | UAL820 | MEX → SFO | Jul 19, 09:10 UTC | Jul 19, 10:10 UTC | 1h 0m |
| 2026-07-19 | UAL820 | MEX → SFO | Jul 19, 08:59 UTC | Jul 19, 22:49 UTC | 13h 50m |
| 2026-07-19 | UAL353T | EWR → LAX | Jul 19, 00:39 UTC | Jul 19, 06:45 UTC | 6h 6m |
| 2026-07-19 | UAL353T | EWR → LAX | Jul 19, 01:55 UTC | Jul 19, 06:50 UTC | 4h 55m |
| 2026-07-18 | UAL8152 | - | Jul 18, 16:00 UTC | Jul 18, 20:45 UTC | 4h 45m |
| 2026-07-17 | UAL353 | SAN → EWR | Jul 17, 23:35 UTC | Jul 18, 04:30 UTC | 4h 56m |
| 2026-07-16 | UAL83 | DEL → EWR | Jul 16, 18:44 UTC | Jul 17, 10:05 UTC | 15h 20m |
| 2026-07-16 | UAL82 | - | Jul 16, 01:50 UTC | Jul 16, 15:55 UTC | 14h 5m |
| 2026-07-15 | UAL713 | SFO → EWR | Jul 15, 18:15 UTC | Jul 15, 23:05 UTC | 4h 50m |
| 2026-07-15 | UAL61 | - | Jul 15, 01:35 UTC | Jul 15, 15:30 UTC | 13h 55m |
| 2026-07-15 | UAL61 | MEL → SFO | Jul 15, 01:09 UTC | Jul 15, 15:19 UTC | 14h 10m |
| 2026-07-14 | UAL60 | SFO → MEL | Jul 14, 07:06 UTC | Jul 14, 22:18 UTC | 15h 12m |
| 2026-07-14 | UAL60 | - | Jul 14, 07:15 UTC | Jul 14, 07:45 UTC | 30m |
| 2026-07-13 | UAL1757 | IAD → SFO | Jul 13, 22:25 UTC | Jul 14, 03:00 UTC | 4h 35m |
| 2026-07-13 | UAL1849 | SFO → IAD | Jul 13, 15:25 UTC | Jul 13, 20:00 UTC | 4h 35m |
| 2026-07-12 | UAL28 | - | Jul 12, 15:15 UTC | Jul 13, 05:20 UTC | 14h 5m |
| 2026-07-12 | UAL29 | - | Jul 12, 11:05 UTC | Jul 12, 11:15 UTC | 10m |
| 2026-07-11 | UAL29 | - | Jul 11, 19:05 UTC | Jul 12, 07:10 UTC | 12h 5m |
| 2026-07-11 | UAL114 | - | Jul 11, 07:25 UTC | Jul 11, 14:55 UTC | 7h 30m |
| 2026-07-10 | UAL115 | SFO → PPT | Jul 10, 21:27 UTC | Jul 11, 05:13 UTC | 7h 46m |
| 2026-07-10 | UAL115 | - | Jul 10, 21:20 UTC | Jul 11, 05:01 UTC | 7h 40m |
| 2026-07-10 | UAL61 | - | Jul 10, 01:05 UTC | Jul 10, 15:05 UTC | 14h 0m |
| 2026-07-09 | UAL60 | SFO → MEL | Jul 9, 06:51 UTC | Jul 9, 21:56 UTC | 15h 5m |
| 2026-07-09 | UAL60 | - | Jul 9, 07:00 UTC | Jul 9, 07:30 UTC | 30m |
| 2026-07-08 | UAL969 | - | Jul 8, 13:30 UTC | Jul 8, 23:50 UTC | 10h 20m |
| 2026-07-07 | UAL968 | - | Jul 7, 22:30 UTC | Jul 8, 08:15 UTC | 9h 45m |
| 2026-07-07 | UAL892 | - | Jul 7, 08:40 UTC | Jul 7, 10:20 UTC | 1h 40m |
| 2026-07-07 | UAL892 | ICN → SFO | Jul 7, 08:41 UTC | Jul 7, 18:42 UTC | 10h 1m |
| 2026-07-06 | UAL893 | SFO → ICN | Jul 6, 19:05 UTC | Jul 7, 06:35 UTC | 11h 30m |
| 2026-07-06 | UAL61 | MEL → SFO | Jul 6, 01:05 UTC | Jul 6, 14:35 UTC | 13h 30m |
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 .