sensors Mode-S transponder
A2CB32
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N27964 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A2CB32
- Octal
- 50545462
- Decimal
- 10,668,850
- Country
- US
- Tail
- N27964
- Type
- B789
- Flights observed
- 125
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Current position
Country allocation
The ICAO 24-bit address A2CB32 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 |
|---|---|---|---|
| UAL820 | United Airlines | 13 | 2026-04-22 |
| UAL152 | United Airlines | 13 | 2026-05-04 |
| UAL153 | United Airlines | 11 | 2026-05-05 |
| UAL28 | United Airlines | 9 | 2026-05-18 |
| UAL83 | United Airlines | 7 | 2026-04-13 |
| UAL29 | United Airlines | 7 | 2026-05-18 |
| UAL821 | United Airlines | 5 | 2026-04-22 |
| UAL839 | United Airlines | 4 | 2026-05-23 |
| UAL60 | United Airlines | 4 | 2026-05-19 |
| UAL62 | United Airlines | 3 | 2026-05-29 |
| UAL61 | United Airlines | 3 | 2026-05-20 |
| UAL32 | United Airlines | 3 | 2026-05-24 |
| UAL27 | United Airlines | 3 | 2026-04-26 |
| UAL2692 | - | 3 | 2026-04-13 |
| UAL772 | United Airlines | 2 | 2026-04-20 |
| UAL63 | United Airlines | 2 | 2026-05-30 |
| UAL6 | United Airlines | 2 | 2026-05-28 |
| UAL26 | United Airlines | 2 | 2026-04-27 |
| UAL199 | United Airlines | 2 | 2026-05-06 |
| UAL198 | United Airlines | 2 | 2026-05-05 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | UAL63 | GRU → IAH | May 30, 01:20 UTC | May 30, 01:55 UTC | 35m |
| 2026-05-29 | UAL62 | IAH → GRU | May 29, 00:25 UTC | May 29, 02:30 UTC | 2h 5m |
| 2026-05-29 | UAL62 | IAH → GRU | May 29, 00:28 UTC | May 29, 09:32 UTC | 9h 4m |
| 2026-05-28 | UAL6 | NRT → IAH | May 28, 08:10 UTC | May 28, 19:35 UTC | 11h 25m |
| 2026-05-27 | UAL7 | IAH → NRT | May 27, 16:30 UTC | May 28, 05:10 UTC | 12h 40m |
| 2026-05-27 | UAL63 | GRU → IAH | May 27, 01:05 UTC | May 27, 10:45 UTC | 9h 40m |
| 2026-05-26 | UAL62 | IAH → GRU | May 26, 00:04 UTC | May 26, 09:04 UTC | 9h 0m |
| 2026-05-25 | UAL6 | NRT → IAH | May 25, 08:30 UTC | May 25, 19:59 UTC | 11h 29m |
| 2026-05-24 | UAL32 | LAX → NRT | May 24, 18:10 UTC | May 25, 05:10 UTC | 11h 0m |
| 2026-05-23 | UAL842 | SYD → LAX | May 23, 23:50 UTC | May 24, 12:20 UTC | 12h 30m |
| 2026-05-23 | UAL839 | LAX → SYD | May 23, 06:30 UTC | May 23, 20:55 UTC | 14h 25m |
| 2026-05-23 | UAL839 | LAX → SYD | May 23, 06:09 UTC | May 23, 20:54 UTC | 14h 45m |
| 2026-05-22 | UAL2403 | RDU → EWR | May 22, 16:20 UTC | May 22, 21:25 UTC | 5h 5m |
| 2026-05-21 | UAL187 | JNB → EWR | May 21, 20:10 UTC | May 22, 11:35 UTC | 15h 24m |
| 2026-05-21 | UAL188 | EWR → JNB | May 21, 03:45 UTC | May 21, 17:40 UTC | 13h 55m |
| 2026-05-20 | UAL713 | ORD → DEL | May 20, 18:05 UTC | May 20, 22:40 UTC | 4h 35m |
| 2026-05-20 | UAL61 | BRU → EWR | May 20, 01:19 UTC | May 20, 14:47 UTC | 13h 28m |
| 2026-05-20 | UAL61 | BRU → EWR | May 20, 01:10 UTC | May 20, 14:50 UTC | 13h 41m |
| 2026-05-19 | UAL60 | SFO → MEL | May 19, 07:02 UTC | May 19, 22:16 UTC | 15h 14m |
| 2026-05-19 | UAL60 | SFO → MEL | May 19, 07:15 UTC | May 19, 07:40 UTC | 25m |
| 2026-05-18 | UAL28 | SIN → SFO | May 18, 13:06 UTC | May 19, 03:56 UTC | 14h 50m |
| 2026-05-18 | UAL28 | SIN → SFO | May 18, 15:00 UTC | May 19, 04:10 UTC | 13h 9m |
| 2026-05-18 | UAL29 | SFO → SIN | May 18, 10:30 UTC | May 18, 10:40 UTC | 10m |
| 2026-05-17 | UAL29 | SFO → SIN | May 17, 18:15 UTC | May 18, 09:10 UTC | 14h 55m |
| 2026-05-16 | UAL28 | SIN → SFO | May 16, 15:25 UTC | May 17, 03:50 UTC | 12h 25m |
| 2026-05-16 | UAL28 | SIN → SFO | May 16, 13:55 UTC | May 16, 14:05 UTC | 10m |
| 2026-05-16 | UAL28 | SIN → SFO | May 16, 14:01 UTC | May 17, 03:43 UTC | 13h 42m |
| 2026-05-15 | UAL29 | SFO → SIN | May 15, 19:35 UTC | May 16, 11:17 UTC | 15h 42m |
| 2026-05-15 | UAL29 | SFO → SIN | May 15, 19:30 UTC | May 16, 09:40 UTC | 14h 11m |
| 2026-05-15 | UAL114 | PPT → SFO | May 15, 08:25 UTC | May 15, 16:35 UTC | 8h 9m |
| 2026-05-14 | UAL115 | SFO → PPT | May 14, 21:00 UTC | May 15, 05:10 UTC | 8h 10m |
| 2026-05-14 | UAL28 | SIN → SFO | May 14, 05:55 UTC | May 14, 16:55 UTC | 11h 0m |
| 2026-05-13 | UAL29D | SFO → SIN | May 13, 06:50 UTC | May 13, 21:40 UTC | 14h 50m |
| 2026-05-11 | UAL28 | SIN → SFO | May 11, 15:25 UTC | May 11, 16:10 UTC | 45m |
| 2026-05-11 | UAL28 | SIN → SFO | May 11, 13:11 UTC | May 12, 03:59 UTC | 14h 48m |
| 2026-05-11 | UAL28 | SIN → SFO | May 11, 13:11 UTC | May 12, 03:59 UTC | 14h 48m |
| 2026-05-10 | UAL29 | SFO → SIN | May 10, 18:35 UTC | May 11, 16:10 UTC | 21h 35m |
| 2026-05-10 | UAL29 | SFO → SIN | May 10, 18:05 UTC | May 11, 08:05 UTC | 14h 0m |
| 2026-05-10 | UAL29 | SFO → SIN | May 10, 17:55 UTC | May 11, 10:34 UTC | 16h 39m |
| 2026-05-10 | UAL61 | BRU → EWR | May 10, 01:14 UTC | May 10, 14:40 UTC | 13h 25m |
| 2026-05-09 | UAL60 | SFO → MEL | May 9, 07:26 UTC | May 9, 22:35 UTC | 15h 9m |
| 2026-05-09 | UAL60 | SFO → MEL | May 9, 07:25 UTC | May 9, 22:39 UTC | 15h 15m |
| 2026-05-08 | UAL870 | SYD → SFO | May 8, 01:24 UTC | May 8, 14:20 UTC | 12h 55m |
| 2026-05-07 | UAL839 | LAX → SYD | May 7, 06:35 UTC | May 7, 11:40 UTC | 5h 5m |
| 2026-05-07 | UAL839 | LAX → SYD | May 7, 06:29 UTC | May 7, 21:05 UTC | 14h 36m |
| 2026-05-06 | UAL199 | PVG → LAX | May 6, 06:30 UTC | May 6, 23:55 UTC | 17h 24m |
| 2026-05-06 | UAL199 | PVG → LAX | May 6, 01:15 UTC | May 6, 23:55 UTC | 22h 39m |
| 2026-05-05 | UAL198 | LAX → PVG | May 5, 20:35 UTC | May 6, 14:50 UTC | 18h 15m |
| 2026-05-05 | UAL198 | LAX → PVG | May 5, 20:10 UTC | May 6, 14:50 UTC | 18h 40m |
| 2026-05-05 | UAL153 | HKG → LAX | May 5, 05:00 UTC | May 5, 17:40 UTC | 12h 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 N27964 page for operator, model, and routing details .