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
- 222
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 6h 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 |
|---|---|---|---|
| UAL153 | United Airlines | 11 | 2026-06-27 |
| UAL152 | United Airlines | 11 | 2026-06-26 |
| UAL839 | - | 10 | 2026-07-02 |
| UAL842 | - | 8 | 2026-06-14 |
| UAL199 | United Airlines | 8 | 2026-06-10 |
| UAL198 | United Airlines | 8 | 2026-06-09 |
| 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 |
| UAL187 | - | 6 | 2026-06-29 |
| 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 |
| UAL178 | United Airlines | 5 | 2026-06-20 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 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 |
| 2026-06-30 | UAL2692 | - | Jun 30, 14:20 UTC | Jun 30, 19:05 UTC | 4h 45m |
| 2026-06-29 | UAL187 | - | Jun 29, 20:00 UTC | Jun 30, 11:35 UTC | 15h 36m |
| 2026-06-29 | UAL188 | EWR → JNB | Jun 29, 02:25 UTC | Jun 29, 03:05 UTC | 40m |
| 2026-06-29 | UAL188 | EWR → JNB | Jun 29, 02:05 UTC | Jun 29, 16:18 UTC | 14h 13m |
| 2026-06-27 | UAL1855 | - | Jun 27, 21:19 UTC | Jun 28, 01:29 UTC | 4h 10m |
| 2026-06-27 | UAL153 | HKG → LAX | Jun 27, 05:39 UTC | Jun 27, 18:49 UTC | 13h 10m |
| 2026-06-27 | UAL153 | HKG → LAX | Jun 27, 02:20 UTC | Jun 27, 02:25 UTC | 5m |
| 2026-06-26 | UAL152 | LAX → HKG | Jun 26, 13:04 UTC | Jun 26, 13:10 UTC | 5m |
| 2026-06-26 | UAL152 | LAX → HKG | Jun 26, 12:49 UTC | Jun 26, 14:57 UTC | 2h 8m |
| 2026-06-25 | UAL152 | LAX → HKG | Jun 25, 20:14 UTC | Jun 26, 10:15 UTC | 14h 0m |
| 2026-06-25 | UAL33 | - | Jun 25, 07:59 UTC | Jun 25, 08:30 UTC | 30m |
| 2026-06-25 | UAL33 | NRT → LAX | Jun 25, 08:05 UTC | Jun 25, 17:32 UTC | 9h 27m |
| 2026-06-24 | UAL7 | - | Jun 24, 15:54 UTC | Jun 25, 04:49 UTC | 12h 55m |
| 2026-06-24 | UAL3936 | DEN → SFO | Jun 24, 02:40 UTC | Jun 24, 04:34 UTC | 1h 55m |
| 2026-06-24 | UAL3936 | DEN → SFO | Jun 24, 02:18 UTC | Jun 24, 04:36 UTC | 2h 18m |
| 2026-06-22 | UAL761 | MUC → DEN | Jun 22, 15:14 UTC | Jun 22, 17:15 UTC | 2h 0m |
| 2026-06-22 | UAL761 | MUC → DEN | Jun 22, 15:06 UTC | Jun 23, 00:54 UTC | 9h 48m |
| 2026-06-22 | UAL760 | DEN → MUC | Jun 22, 03:54 UTC | Jun 22, 13:05 UTC | 9h 10m |
| 2026-06-21 | UAL263 | - | Jun 21, 14:40 UTC | Jun 21, 23:14 UTC | 8h 35m |
| 2026-06-21 | UAL263 | LHR → DEN | Jun 21, 14:14 UTC | Jun 21, 23:41 UTC | 9h 27m |
| 2026-06-21 | UAL262 | DEN → LHR | Jun 21, 02:47 UTC | Jun 21, 10:55 UTC | 8h 8m |
| 2026-06-21 | UAL262 | - | Jun 21, 02:45 UTC | Jun 21, 04:39 UTC | 1h 55m |
| 2026-06-20 | UAL178 | KIX → GUM | Jun 20, 13:04 UTC | Jun 20, 23:14 UTC | 10h 10m |
| 2026-06-20 | UAL178 | KIX → GUM | Jun 20, 12:47 UTC | Jun 20, 23:31 UTC | 10h 44m |
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 .