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
- 202
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2h 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 |
|---|---|---|---|
| UAL152 | United Airlines | 8 | 2026-06-17 |
| UAL199 | - | 7 | 2026-07-12 |
| UAL178 | United Airlines | 7 | 2026-06-11 |
| UAL153 | United Airlines | 7 | 2026-06-18 |
| UAL1227 | - | 7 | 2026-06-22 |
| UAL935 | - | 6 | 2026-07-11 |
| UAL923 | - | 6 | 2026-07-10 |
| UAL760 | United Airlines | 6 | 2026-06-12 |
| UAL263 | United Airlines | 6 | 2026-05-10 |
| UAL198 | - | 6 | 2026-07-12 |
| UAL182 | United Airlines | 6 | 2026-06-08 |
| UAL78 | United Airlines | 5 | 2026-04-13 |
| UAL761 | United Airlines | 5 | 2026-06-12 |
| UAL7 | - | 5 | 2026-07-02 |
| UAL27 | United Airlines | 5 | 2026-06-09 |
| UAL262 | United Airlines | 5 | 2026-05-10 |
| UAL181 | United Airlines | 5 | 2026-06-09 |
| UAL177 | United Airlines | 5 | 2026-06-11 |
| UAL863 | - | 4 | 2026-06-23 |
| UAL842 | - | 4 | 2026-07-07 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | UAL353 | - | Jul 13, 23:15 UTC | Jul 14, 03:30 UTC | 4h 15m |
| 2026-07-13 | UAL2096 | - | Jul 13, 15:40 UTC | Jul 13, 20:25 UTC | 4h 45m |
| 2026-07-13 | UAL2096 | LAX → EWR | Jul 13, 15:41 UTC | Jul 13, 20:26 UTC | 4h 45m |
| 2026-07-12 | UAL199 | - | Jul 12, 16:30 UTC | Jul 12, 18:05 UTC | 1h 35m |
| 2026-07-12 | UAL199 | PVG → LAX | Jul 12, 15:36 UTC | Jul 13, 02:55 UTC | 11h 19m |
| 2026-07-12 | UAL199 | - | Jul 12, 10:30 UTC | Jul 13, 03:01 UTC | 16h 30m |
| 2026-07-12 | UAL198 | - | Jul 12, 01:00 UTC | Jul 12, 12:30 UTC | 11h 30m |
| 2026-07-12 | UAL198 | LAX → PVG | Jul 12, 01:01 UTC | Jul 12, 13:21 UTC | 12h 20m |
| 2026-07-11 | UAL935 | - | Jul 11, 12:30 UTC | Jul 11, 22:55 UTC | 10h 25m |
| 2026-07-10 | UAL923 | - | Jul 10, 23:00 UTC | Jul 11, 08:50 UTC | 9h 50m |
| 2026-07-10 | UAL99 | MEL → LAX | Jul 10, 00:00 UTC | Jul 10, 14:05 UTC | 14h 5m |
| 2026-07-09 | UAL98 | - | Jul 9, 06:45 UTC | Jul 9, 21:30 UTC | 14h 45m |
| 2026-07-09 | UAL98 | LAX → MEL | Jul 9, 06:09 UTC | Jul 9, 21:34 UTC | 15h 25m |
| 2026-07-08 | UAL199 | PVG → LAX | Jul 8, 13:05 UTC | Jul 8, 14:55 UTC | 1h 50m |
| 2026-07-08 | UAL199 | - | Jul 8, 06:45 UTC | Jul 8, 23:50 UTC | 17h 5m |
| 2026-07-07 | UAL198 | - | Jul 7, 20:40 UTC | Jul 8, 07:30 UTC | 10h 50m |
| 2026-07-07 | UAL198 | LAX → PVG | Jul 7, 20:31 UTC | Jul 8, 09:22 UTC | 12h 51m |
| 2026-07-07 | UAL842 | SYD → LAX | Jul 7, 00:01 UTC | Jul 7, 13:06 UTC | 13h 5m |
| 2026-07-07 | UAL842 | - | Jul 7, 00:10 UTC | Jul 7, 01:10 UTC | 1h 0m |
| 2026-07-06 | UAL839 | - | Jul 6, 06:30 UTC | Jul 6, 20:50 UTC | 14h 20m |
| 2026-07-05 | UAL935 | - | Jul 5, 12:25 UTC | Jul 5, 22:45 UTC | 10h 20m |
| 2026-07-04 | UAL923 | - | Jul 4, 22:50 UTC | Jul 5, 08:55 UTC | 10h 5m |
| 2026-07-04 | UAL923 | LAX → LHR | Jul 4, 22:53 UTC | Jul 5, 08:48 UTC | 9h 55m |
| 2026-07-04 | UAL38 | HND → LAX | Jul 4, 09:35 UTC | Jul 4, 18:53 UTC | 9h 18m |
| 2026-07-04 | UAL38 | - | Jul 4, 09:25 UTC | Jul 4, 18:55 UTC | 9h 30m |
| 2026-07-03 | UAL39 | LAX → HND | Jul 3, 19:35 UTC | Jul 4, 06:35 UTC | 11h 0m |
| 2026-07-03 | UAL33 | - | Jul 3, 07:55 UTC | Jul 3, 17:30 UTC | 9h 35m |
| 2026-07-02 | UAL7 | - | Jul 2, 16:00 UTC | Jul 3, 04:30 UTC | 12h 30m |
| 2026-07-02 | UAL63 | - | Jul 2, 01:20 UTC | Jul 2, 10:50 UTC | 9h 30m |
| 2026-07-01 | UAL62 | - | Jul 1, 00:20 UTC | Jul 1, 09:20 UTC | 9h 0m |
| 2026-06-30 | UAL6 | - | Jun 30, 08:15 UTC | Jun 30, 19:25 UTC | 11h 10m |
| 2026-06-29 | UAL32 | - | Jun 29, 18:19 UTC | Jun 30, 05:30 UTC | 11h 11m |
| 2026-06-28 | UAL935 | - | Jun 28, 12:35 UTC | Jun 28, 22:39 UTC | 10h 5m |
| 2026-06-28 | UAL948 | SFO → LHR | Jun 28, 00:14 UTC | Jun 28, 09:58 UTC | 9h 44m |
| 2026-06-28 | UAL948 | SFO → LHR | Jun 28, 00:15 UTC | Jun 28, 10:00 UTC | 9h 45m |
| 2026-06-26 | UAL969 | - | Jun 26, 13:34 UTC | Jun 26, 23:55 UTC | 10h 20m |
| 2026-06-26 | UAL969 | AMS → SFO | Jun 26, 13:36 UTC | Jun 26, 23:52 UTC | 10h 16m |
| 2026-06-25 | UAL968 | - | Jun 25, 22:29 UTC | Jun 26, 08:20 UTC | 9h 50m |
| 2026-06-25 | UAL892 | - | Jun 25, 09:20 UTC | Jun 25, 19:05 UTC | 9h 45m |
| 2026-06-24 | UAL893 | SFO → ICN | Jun 24, 19:29 UTC | Jun 25, 07:25 UTC | 11h 55m |
| 2026-06-24 | UAL870 | - | Jun 24, 01:44 UTC | Jun 24, 02:40 UTC | 55m |
| 2026-06-24 | UAL870 | SYD → SFO | Jun 24, 01:30 UTC | Jun 24, 14:34 UTC | 13h 4m |
| 2026-06-23 | UAL863 | SFO → SYD | Jun 23, 07:19 UTC | Jun 23, 21:54 UTC | 14h 35m |
| 2026-06-22 | UAL1227 | EWR → SFO | Jun 22, 17:42 UTC | Jun 22, 23:31 UTC | 5h 49m |
| 2026-06-22 | UAL1227 | - | Jun 22, 18:09 UTC | Jun 22, 23:29 UTC | 5h 20m |
| 2026-06-22 | UAL123 | - | Jun 22, 07:14 UTC | Jun 22, 14:14 UTC | 7h 0m |
| 2026-06-22 | UAL123 | LHR → EWR | Jun 22, 07:02 UTC | Jun 22, 14:14 UTC | 7h 12m |
| 2026-06-21 | UAL122 | EWR → LHR | Jun 21, 14:04 UTC | Jun 21, 19:59 UTC | 5h 55m |
| 2026-06-21 | UAL122 | - | Jun 21, 13:39 UTC | Jun 21, 13:44 UTC | 5m |
| 2026-06-20 | UAL2480 | SFO → EWR | Jun 20, 21:55 UTC | Jun 21, 02:35 UTC | 4h 40m |
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 .