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
- 246
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 18:55 UTC
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 |
|---|---|---|---|
| UAL842 | - | 11 | 2026-07-16 |
| UAL153 | United Airlines | 11 | 2026-06-27 |
| UAL152 | United Airlines | 11 | 2026-06-26 |
| UAL839 | - | 10 | 2026-07-02 |
| UAL199 | United Airlines | 8 | 2026-06-10 |
| UAL198 | United Airlines | 8 | 2026-06-09 |
| UAL187 | United Airlines | 8 | 2026-07-20 |
| UAL142 | United Airlines | 8 | 2026-06-19 |
| UAL761 | United Airlines | 7 | 2026-06-22 |
| UAL33 | - | 7 | 2026-06-25 |
| UAL32 | - | 7 | 2026-06-15 |
| UAL182 | United Airlines | 7 | 2026-05-30 |
| UAL98 | United Airlines | 6 | 2026-05-23 |
| UAL99 | United Airlines | 5 | 2026-05-24 |
| UAL7 | - | 5 | 2026-06-24 |
| UAL63 | - | 5 | 2026-06-18 |
| UAL6 | - | 5 | 2026-06-16 |
| UAL263 | - | 5 | 2026-06-21 |
| UAL262 | - | 5 | 2026-06-21 |
| UAL2096 | - | 5 | 2026-07-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL805 | SFO → ICN | Jul 26, 07:26 UTC | Jul 26, 18:51 UTC | 11h 25m |
| 2026-07-26 | UAL805 | SFO → ICN | Jul 26, 07:15 UTC | Jul 26, 17:15 UTC | 10h 0m |
| 2026-07-25 | UAL28 | SIN → SFO | Jul 25, 14:35 UTC | Jul 26, 04:35 UTC | 14h 0m |
| 2026-07-25 | UAL28 | SIN → SFO | Jul 25, 13:16 UTC | Jul 26, 04:30 UTC | 15h 14m |
| 2026-07-24 | UAL29 | SFO → SIN | Jul 24, 18:45 UTC | Jul 25, 10:43 UTC | 15h 58m |
| 2026-07-24 | UAL29 | SFO → SIN | Jul 24, 19:10 UTC | Jul 25, 09:15 UTC | 14h 5m |
| 2026-07-23 | UAL949 | LHR → SFO | Jul 23, 13:05 UTC | Jul 23, 23:35 UTC | 10h 30m |
| 2026-07-23 | UAL948 | SFO → LHR | Jul 23, 01:30 UTC | Jul 23, 10:55 UTC | 9h 25m |
| 2026-07-22 | UAL949 | LHR → SFO | Jul 22, 12:45 UTC | Jul 22, 23:10 UTC | 10h 25m |
| 2026-07-22 | UAL122 | IAD → LHR | Jul 22, 00:54 UTC | Jul 22, 06:50 UTC | 5h 56m |
| 2026-07-22 | UAL122 | IAD → LHR | Jul 22, 00:35 UTC | Jul 22, 02:25 UTC | 1h 50m |
| 2026-07-20 | UAL187 | JNB → EWR | Jul 20, 20:25 UTC | Jul 21, 11:25 UTC | 15h 0m |
| 2026-07-20 | UAL187 | JNB → EWR | Jul 20, 20:19 UTC | Jul 21, 11:24 UTC | 15h 5m |
| 2026-07-20 | UAL188 | EWR → JNB | Jul 20, 02:50 UTC | Jul 20, 17:10 UTC | 14h 20m |
| 2026-07-18 | UAL83 | DEL → EWR | Jul 18, 18:35 UTC | Jul 19, 10:20 UTC | 15h 45m |
| 2026-07-18 | UAL82 | EWR → DEL | Jul 18, 02:14 UTC | Jul 18, 16:20 UTC | 14h 6m |
| 2026-07-17 | UAL2096 | - | Jul 17, 16:15 UTC | Jul 17, 20:50 UTC | 4h 35m |
| 2026-07-16 | UAL842 | - | Jul 16, 23:59 UTC | Jul 17, 00:35 UTC | 35m |
| 2026-07-16 | UAL842 | SYD → LAX | Jul 16, 23:51 UTC | Jul 17, 13:10 UTC | 13h 19m |
| 2026-07-16 | UAL842 | SYD → LAX | Jul 16, 23:51 UTC | Jul 17, 12:58 UTC | 13h 7m |
| 2026-07-16 | UAL863 | SFO → SYD | Jul 16, 06:25 UTC | Jul 16, 20:55 UTC | 14h 30m |
| 2026-07-15 | UAL1757 | - | Jul 15, 22:20 UTC | Jul 16, 03:25 UTC | 5h 5m |
| 2026-07-14 | UAL2023 | CPT → IAD | Jul 14, 18:10 UTC | Jul 15, 08:35 UTC | 14h 24m |
| 2026-07-14 | UAL1011 | - | Jul 14, 13:50 UTC | Jul 14, 14:00 UTC | 10m |
| 2026-07-13 | UAL1011 | - | Jul 13, 23:50 UTC | Jul 14, 00:35 UTC | 45m |
| 2026-07-12 | UAL2023 | CPT → IAD | Jul 12, 18:01 UTC | Jul 13, 09:05 UTC | 15h 5m |
| 2026-07-12 | UAL1011 | - | Jul 12, 12:50 UTC | Jul 12, 13:05 UTC | 15m |
| 2026-07-11 | UAL1011 | - | Jul 11, 22:55 UTC | Jul 12, 06:35 UTC | 7h 40m |
| 2026-07-11 | UAL1849 | SFO → IAD | Jul 11, 15:35 UTC | Jul 11, 20:05 UTC | 4h 30m |
| 2026-07-10 | UAL806 | ICN → SFO | Jul 10, 02:56 UTC | Jul 10, 12:54 UTC | 9h 58m |
| 2026-07-10 | UAL806 | - | Jul 10, 02:40 UTC | Jul 10, 03:10 UTC | 30m |
| 2026-07-09 | UAL805 | SFO → ICN | Jul 9, 07:42 UTC | Jul 9, 19:11 UTC | 11h 29m |
| 2026-07-09 | UAL805 | SFO → ICN | Jul 9, 07:40 UTC | Jul 9, 19:15 UTC | 11h 35m |
| 2026-07-08 | UAL949 | - | Jul 8, 12:30 UTC | Jul 8, 22:45 UTC | 10h 15m |
| 2026-07-08 | UAL949 | LHR → SFO | Jul 8, 12:25 UTC | Jul 8, 22:46 UTC | 10h 21m |
| 2026-07-08 | UAL948 | SFO → LHR | Jul 8, 00:34 UTC | Jul 8, 10:11 UTC | 9h 37m |
| 2026-07-08 | UAL948 | - | Jul 8, 00:40 UTC | Jul 8, 10:20 UTC | 9h 40m |
| 2026-07-06 | UAL1593 | - | Jul 6, 14:30 UTC | Jul 6, 19:35 UTC | 5h 5m |
| 2026-07-06 | UAL1141 | SFO → EWR | Jul 6, 06:00 UTC | Jul 6, 10:35 UTC | 4h 35m |
| 2026-07-05 | UAL969 | - | Jul 5, 13:15 UTC | Jul 6, 00:00 UTC | 10h 45m |
| 2026-07-04 | UAL968 | SFO → AMS | Jul 4, 22:10 UTC | Jul 5, 07:55 UTC | 9h 45m |
| 2026-07-04 | UAL892 | - | Jul 4, 08:15 UTC | Jul 4, 18:20 UTC | 10h 5m |
| 2026-07-03 | UAL893 | SFO → ICN | Jul 3, 18:10 UTC | Jul 4, 06:04 UTC | 11h 54m |
| 2026-07-03 | UAL893 | SFO → ICN | Jul 3, 18:30 UTC | Jul 4, 06:10 UTC | 11h 40m |
| 2026-07-03 | UAL870 | - | Jul 3, 00:55 UTC | Jul 3, 14:00 UTC | 13h 5m |
| 2026-07-02 | UAL839 | LAX → SYD | Jul 2, 06:44 UTC | Jul 2, 20:46 UTC | 14h 2m |
| 2026-07-02 | UAL839 | - | Jul 2, 06:41 UTC | Jul 2, 21:05 UTC | 14h 24m |
| 2026-07-01 | UAL935 | - | Jul 1, 12:30 UTC | Jul 1, 13:15 UTC | 45m |
| 2026-07-01 | UAL935 | LHR → LAX | Jul 1, 12:30 UTC | Jul 1, 22:38 UTC | 10h 8m |
| 2026-06-30 | UAL923 | - | Jun 30, 23:25 UTC | Jul 1, 08:45 UTC | 9h 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 .