sensors Mode-S transponder
A2A3B5
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N26966 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A2A3B5
- Octal
- 50521665
- Decimal
- 10,658,741
- Country
- US
- Tail
- N26966
- Type
- B789
- Flights observed
- 118
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address A2A3B5 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 |
|---|---|---|---|
| UAL142 | United Airlines | 7 | 2026-05-29 |
| UAL98 | United Airlines | 6 | 2026-05-23 |
| UAL32 | United Airlines | 6 | 2026-05-25 |
| UAL199 | United Airlines | 6 | 2026-05-22 |
| UAL198 | United Airlines | 6 | 2026-05-21 |
| UAL99 | United Airlines | 5 | 2026-05-24 |
| UAL842 | United Airlines | 5 | 2026-05-19 |
| UAL187 | United Airlines | 5 | 2026-04-15 |
| UAL182 | United Airlines | 5 | 2026-05-29 |
| UAL839 | United Airlines | 4 | 2026-05-18 |
| UAL63 | United Airlines | 4 | 2026-05-28 |
| UAL2096 | United Airlines | 4 | 2026-05-09 |
| UAL153 | United Airlines | 4 | 2026-05-01 |
| UAL821 | United Airlines | 3 | 2026-05-07 |
| UAL820 | United Airlines | 3 | 2026-05-07 |
| UAL78 | United Airlines | 3 | 2026-04-24 |
| UAL7 | United Airlines | 3 | 2026-05-28 |
| UAL62 | United Airlines | 3 | 2026-05-27 |
| UAL6 | United Airlines | 3 | 2026-05-26 |
| UAL33 | United Airlines | 3 | 2026-05-04 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL182 | DEN → FRA | May 29, 22:20 UTC | May 29, 23:15 UTC | 55m |
| 2026-05-29 | UAL142 | NRT → DEN | May 29, 07:55 UTC | May 29, 18:25 UTC | 10h 31m |
| 2026-05-29 | UAL142 | NRT → DEN | May 29, 07:50 UTC | May 29, 18:22 UTC | 10h 32m |
| 2026-05-28 | UAL7 | IAH → NRT | May 28, 16:00 UTC | May 29, 04:55 UTC | 12h 55m |
| 2026-05-28 | UAL63 | GRU → IAH | May 28, 01:25 UTC | May 28, 10:50 UTC | 9h 25m |
| 2026-05-28 | UAL63 | GRU → IAH | May 28, 01:16 UTC | May 28, 10:50 UTC | 9h 34m |
| 2026-05-27 | UAL62 | IAH → GRU | May 27, 00:25 UTC | May 27, 09:30 UTC | 9h 5m |
| 2026-05-26 | UAL6 | NRT → IAH | May 26, 08:19 UTC | May 26, 19:50 UTC | 11h 30m |
| 2026-05-25 | UAL32 | LAX → NRT | May 25, 18:35 UTC | May 26, 05:20 UTC | 10h 44m |
| 2026-05-25 | UAL32 | LAX → NRT | May 25, 18:15 UTC | May 26, 05:17 UTC | 11h 2m |
| 2026-05-24 | UAL99 | MEL → LAX | May 24, 00:01 UTC | May 24, 13:26 UTC | 13h 25m |
| 2026-05-23 | UAL99 | MEL → LAX | May 23, 23:50 UTC | May 24, 13:30 UTC | 13h 40m |
| 2026-05-23 | UAL98 | LAX → MEL | May 23, 06:10 UTC | May 23, 21:35 UTC | 15h 25m |
| 2026-05-23 | UAL98 | LAX → MEL | May 23, 05:59 UTC | May 23, 21:27 UTC | 15h 28m |
| 2026-05-22 | UAL199 | PVG → LAX | May 22, 13:35 UTC | May 22, 15:05 UTC | 1h 30m |
| 2026-05-22 | UAL199 | PVG → LAX | May 22, 07:00 UTC | May 22, 23:40 UTC | 16h 40m |
| 2026-05-21 | UAL198 | LAX → PVG | May 21, 20:45 UTC | May 21, 21:40 UTC | 55m |
| 2026-05-21 | UAL198 | LAX → PVG | May 21, 20:46 UTC | May 22, 09:42 UTC | 12h 56m |
| 2026-05-19 | UAL842 | SYD → LAX | May 19, 00:05 UTC | May 19, 12:45 UTC | 12h 40m |
| 2026-05-18 | UAL839 | LAX → SYD | May 18, 06:25 UTC | May 18, 21:35 UTC | 15h 9m |
| 2026-05-16 | UAL99 | MEL → LAX | May 16, 23:45 UTC | May 17, 13:25 UTC | 13h 40m |
| 2026-05-16 | UAL98 | LAX → MEL | May 16, 06:10 UTC | May 16, 21:15 UTC | 15h 5m |
| 2026-05-16 | UAL98 | LAX → MEL | May 16, 05:59 UTC | May 16, 21:26 UTC | 15h 27m |
| 2026-05-15 | UAL99 | MEL → LAX | May 15, 00:01 UTC | May 15, 13:30 UTC | 13h 29m |
| 2026-05-14 | UAL99 | MEL → LAX | May 14, 23:45 UTC | May 15, 13:30 UTC | 13h 45m |
| 2026-05-14 | UAL98 | LAX → MEL | May 14, 06:10 UTC | May 14, 19:15 UTC | 13h 5m |
| 2026-05-14 | UAL98 | LAX → MEL | May 14, 05:59 UTC | May 14, 21:15 UTC | 15h 16m |
| 2026-05-11 | UAL2679 | DEN → ORD | May 11, 14:25 UTC | May 11, 19:25 UTC | 5h 0m |
| 2026-05-10 | UAL83 | DEL → EWR | May 10, 19:00 UTC | May 10, 19:15 UTC | 15m |
| 2026-05-10 | UAL83 | DEL → EWR | May 10, 18:55 UTC | May 11, 11:02 UTC | 16h 7m |
| 2026-05-10 | UAL82 | EWR → DEL | May 10, 02:00 UTC | May 10, 16:20 UTC | 14h 20m |
| 2026-05-09 | UAL2096 | LAX → EWR | May 9, 16:35 UTC | May 9, 21:00 UTC | 4h 25m |
| 2026-05-08 | UAL842 | SYD → LAX | May 8, 23:55 UTC | May 9, 12:55 UTC | 13h 0m |
| 2026-05-08 | UAL839 | LAX → SYD | May 8, 06:54 UTC | May 8, 21:37 UTC | 14h 43m |
| 2026-05-08 | UAL839 | LAX → SYD | May 8, 06:59 UTC | May 8, 21:30 UTC | 14h 30m |
| 2026-05-07 | UAL821 | SFO → MEX | May 7, 14:50 UTC | May 8, 02:29 UTC | 11h 39m |
| 2026-05-07 | UAL821 | SFO → MEX | May 7, 14:05 UTC | May 7, 14:20 UTC | 15m |
| 2026-05-07 | UAL821 | SFO → MEX | May 7, 09:05 UTC | May 7, 11:18 UTC | 2h 13m |
| 2026-05-07 | UAL820 | MEX → SFO | May 7, 01:40 UTC | May 7, 02:20 UTC | 40m |
| 2026-05-07 | UAL820 | MEX → SFO | May 7, 00:00 UTC | May 7, 00:15 UTC | 15m |
| 2026-05-06 | UAL820 | MEX → SFO | May 6, 06:25 UTC | May 6, 21:25 UTC | 15h 0m |
| 2026-05-05 | UAL199 | PVG → LAX | May 5, 13:15 UTC | May 5, 14:35 UTC | 1h 20m |
| 2026-05-05 | UAL199 | PVG → LAX | May 5, 06:50 UTC | May 5, 23:40 UTC | 16h 50m |
| 2026-05-04 | UAL198 | LAX → PVG | May 4, 20:10 UTC | May 5, 08:50 UTC | 12h 40m |
| 2026-05-04 | UAL198 | LAX → PVG | May 4, 20:08 UTC | May 5, 10:02 UTC | 13h 54m |
| 2026-05-04 | UAL33 | NRT → LAX | May 4, 08:10 UTC | May 4, 17:45 UTC | 9h 35m |
| 2026-05-03 | UAL32 | LAX → NRT | May 3, 17:50 UTC | May 4, 04:39 UTC | 10h 50m |
| 2026-05-03 | UAL32 | LAX → NRT | May 3, 17:55 UTC | May 4, 04:39 UTC | 10h 44m |
| 2026-05-02 | UAL199 | PVG → LAX | May 2, 13:25 UTC | May 2, 14:40 UTC | 1h 15m |
| 2026-05-02 | UAL199 | PVG → LAX | May 2, 06:25 UTC | May 2, 23:45 UTC | 17h 20m |
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 N26966 page for operator, model, and routing details .