sensors Mode-S transponder
A2A3D2
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N26970 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A2A3D2
- Octal
- 50521722
- Decimal
- 10,658,770
- Country
- US
- Tail
- N26970
- Type
- B789
- Flights observed
- 102
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 7h ago
Last known position
Country allocation
The ICAO 24-bit address A2A3D2 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 |
|---|---|---|---|
| UAL821 | United Airlines | 8 | 2026-05-18 |
| UAL820 | United Airlines | 8 | 2026-05-18 |
| UAL761 | United Airlines | 8 | 2026-04-16 |
| UAL760 | United Airlines | 7 | 2026-04-16 |
| UAL198 | United Airlines | 7 | 2026-05-14 |
| UAL188 | United Airlines | 5 | 2026-05-02 |
| UAL187 | United Airlines | 5 | 2026-05-02 |
| UAL177 | - | 5 | 2026-04-13 |
| UAL153 | United Airlines | 5 | 2026-04-26 |
| UAL143 | United Airlines | 5 | 2026-04-18 |
| UAL263 | United Airlines | 4 | 2026-04-14 |
| UAL199 | United Airlines | 4 | 2026-05-14 |
| UAL842 | United Airlines | 3 | 2026-05-12 |
| UAL839 | United Airlines | 3 | 2026-05-19 |
| UAL78 | United Airlines | 3 | 2026-04-21 |
| UAL2096 | United Airlines | 3 | 2026-05-05 |
| UAL178 | United Airlines | 3 | 2026-04-13 |
| UAL152 | United Airlines | 3 | 2026-04-25 |
| UAL29 | United Airlines | 2 | 2026-05-20 |
| UAL262 | - | 2 | 2026-04-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL28 | SIN → SFO | May 29, 14:45 UTC | May 29, 16:30 UTC | 1h 45m |
| 2026-05-20 | UAL29 | SFO → SIN | May 20, 17:55 UTC | May 21, 10:26 UTC | 16h 31m |
| 2026-05-20 | UAL29 | SFO → SIN | May 20, 18:15 UTC | May 21, 08:40 UTC | 14h 25m |
| 2026-05-20 | UAL870 | SYD → SFO | May 20, 00:45 UTC | May 20, 13:45 UTC | 13h 1m |
| 2026-05-19 | UAL839 | LAX → SYD | May 19, 06:10 UTC | May 19, 07:00 UTC | 50m |
| 2026-05-19 | UAL839 | LAX → SYD | May 19, 06:04 UTC | May 19, 21:08 UTC | 15h 4m |
| 2026-05-18 | UAL821 | SFO → MEX | May 18, 14:15 UTC | May 19, 02:50 UTC | 12h 34m |
| 2026-05-18 | UAL821 | SFO → MEX | May 18, 10:55 UTC | May 18, 11:00 UTC | 5m |
| 2026-05-18 | UAL821 | SFO → MEX | May 18, 08:50 UTC | May 18, 09:20 UTC | 30m |
| 2026-05-18 | UAL820 | MEX → SFO | May 18, 01:45 UTC | May 18, 02:20 UTC | 35m |
| 2026-05-18 | UAL820 | MEX → SFO | May 18, 00:05 UTC | May 18, 00:15 UTC | 10m |
| 2026-05-17 | UAL820 | MEX → SFO | May 17, 20:01 UTC | May 17, 20:20 UTC | 20m |
| 2026-05-17 | UAL820 | MEX → SFO | May 17, 06:30 UTC | May 17, 19:30 UTC | 13h 0m |
| 2026-05-14 | UAL199 | PVG → LAX | May 14, 13:25 UTC | May 14, 14:55 UTC | 1h 30m |
| 2026-05-14 | UAL199 | PVG → LAX | May 14, 06:20 UTC | May 14, 23:35 UTC | 17h 15m |
| 2026-05-14 | UAL198 | LAX → PVG | May 14, 00:35 UTC | May 14, 23:35 UTC | 23h 0m |
| 2026-05-14 | UAL198 | LAX → PVG | May 14, 00:15 UTC | May 14, 22:30 UTC | 22h 15m |
| 2026-05-13 | UAL198 | LAX → PVG | May 13, 20:35 UTC | May 14, 14:55 UTC | 18h 20m |
| 2026-05-13 | UAL198 | LAX → PVG | May 13, 20:05 UTC | May 14, 01:50 UTC | 5h 45m |
| 2026-05-13 | UAL198 | LAX → PVG | May 13, 20:08 UTC | May 14, 08:55 UTC | 12h 47m |
| 2026-05-12 | UAL842 | SYD → LAX | May 12, 23:51 UTC | May 13, 12:55 UTC | 13h 4m |
| 2026-05-12 | UAL842 | SYD → LAX | May 12, 23:45 UTC | May 13, 12:55 UTC | 13h 10m |
| 2026-05-12 | UAL863 | SFO → SYD | May 12, 06:40 UTC | May 12, 21:01 UTC | 14h 20m |
| 2026-05-11 | UAL3908 | SYD → SFO | May 11, 20:20 UTC | May 11, 21:15 UTC | 55m |
| 2026-05-05 | UAL353 | SAN → EWR | May 5, 22:45 UTC | May 6, 04:20 UTC | 5h 35m |
| 2026-05-05 | UAL2096 | LAX → EWR | May 5, 16:00 UTC | May 5, 20:10 UTC | 4h 10m |
| 2026-05-05 | UAL2096 | LAX → EWR | May 5, 16:11 UTC | May 5, 20:07 UTC | 3h 56m |
| 2026-05-04 | UAL2679 | DEN → ORD | May 4, 14:30 UTC | May 4, 20:00 UTC | 5h 31m |
| 2026-05-02 | UAL187 | JNB → EWR | May 2, 20:05 UTC | May 3, 11:55 UTC | 15h 49m |
| 2026-05-02 | UAL188 | EWR → JNB | May 2, 03:14 UTC | May 2, 16:26 UTC | 13h 12m |
| 2026-05-02 | UAL188 | EWR → JNB | May 2, 02:50 UTC | May 2, 16:25 UTC | 13h 35m |
| 2026-05-01 | UAL2096 | LAX → EWR | May 1, 16:10 UTC | May 1, 20:25 UTC | 4h 15m |
| 2026-04-30 | UAL842 | SYD → LAX | Apr 30, 23:50 UTC | May 1, 12:40 UTC | 12h 50m |
| 2026-04-30 | UAL839 | LAX → SYD | Apr 30, 06:20 UTC | Apr 30, 21:00 UTC | 14h 40m |
| 2026-04-29 | UAL821 | SFO → MEX | Apr 29, 14:35 UTC | Apr 30, 02:25 UTC | 11h 49m |
| 2026-04-29 | UAL821 | SFO → MEX | Apr 29, 13:55 UTC | Apr 29, 14:00 UTC | 5m |
| 2026-04-29 | UAL821 | SFO → MEX | Apr 29, 11:35 UTC | Apr 29, 11:40 UTC | 5m |
| 2026-04-29 | UAL821 | SFO → MEX | Apr 29, 09:20 UTC | Apr 29, 09:50 UTC | 30m |
| 2026-04-29 | UAL821 | SFO → MEX | Apr 29, 09:05 UTC | Apr 29, 11:33 UTC | 2h 28m |
| 2026-04-29 | UAL820 | MEX → SFO | Apr 29, 02:05 UTC | Apr 29, 02:30 UTC | 25m |
| 2026-04-29 | UAL820 | MEX → SFO | Apr 29, 00:21 UTC | Apr 29, 02:39 UTC | 2h 18m |
| 2026-04-29 | UAL820 | MEX → SFO | Apr 29, 00:20 UTC | Apr 29, 00:34 UTC | 15m |
| 2026-04-28 | UAL820 | MEX → SFO | Apr 28, 07:05 UTC | Apr 28, 22:00 UTC | 14h 55m |
| 2026-04-27 | UAL199 | PVG → LAX | Apr 27, 13:55 UTC | Apr 27, 14:30 UTC | 35m |
| 2026-04-27 | UAL199 | PVG → LAX | Apr 27, 12:57 UTC | Apr 27, 23:49 UTC | 10h 52m |
| 2026-04-26 | UAL198 | LAX → PVG | Apr 26, 21:35 UTC | Apr 26, 22:40 UTC | 1h 5m |
| 2026-04-26 | UAL198 | LAX → PVG | Apr 26, 21:38 UTC | Apr 27, 10:47 UTC | 13h 9m |
| 2026-04-26 | UAL153 | HKG → LAX | Apr 26, 07:35 UTC | Apr 26, 19:05 UTC | 11h 30m |
| 2026-04-26 | UAL153 | HKG → LAX | Apr 26, 06:45 UTC | Apr 26, 07:05 UTC | 20m |
| 2026-04-26 | UAL153 | HKG → LAX | Apr 26, 06:23 UTC | Apr 26, 18:54 UTC | 12h 31m |
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 N26970 page for operator, model, and routing details .