sensors Mode-S transponder
A2CB14
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N27959 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A2CB14
- Octal
- 50545424
- Decimal
- 10,668,820
- Country
- US
- Tail
- N27959
- Type
- B789
- Flights observed
- 98
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address A2CB14 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 |
|---|---|---|---|
| UAL152 | United Airlines | 5 | 2026-05-21 |
| UAL935 | United Airlines | 4 | 2026-05-18 |
| UAL907 | United Airlines | 4 | 2026-04-16 |
| UAL906 | United Airlines | 4 | 2026-04-16 |
| UAL806 | United Airlines | 4 | 2026-05-28 |
| UAL805 | United Airlines | 4 | 2026-05-27 |
| UAL187 | United Airlines | 4 | 2026-05-08 |
| UAL923 | United Airlines | 3 | 2026-05-17 |
| UAL821 | United Airlines | 3 | 2026-05-02 |
| UAL820 | United Airlines | 3 | 2026-05-02 |
| UAL82 | United Airlines | 3 | 2026-04-28 |
| UAL771 | United Airlines | 3 | 2026-05-03 |
| UAL3932 | United Airlines | 3 | 2026-04-17 |
| UAL29 | United Airlines | 3 | 2026-05-28 |
| UAL188 | United Airlines | 3 | 2026-05-08 |
| UAL1227 | United Airlines | 3 | 2026-04-13 |
| UAL99 | United Airlines | 2 | 2026-05-19 |
| UAL863 | United Airlines | 2 | 2026-05-16 |
| UAL83 | United Airlines | 2 | 2026-04-28 |
| UAL79 | United Airlines | 2 | 2026-05-09 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-28 | UAL29 | SFO → SIN | May 28, 19:45 UTC | May 29, 10:25 UTC | 14h 40m |
| 2026-05-28 | UAL806 | ICN → SFO | May 28, 02:56 UTC | May 28, 12:40 UTC | 9h 44m |
| 2026-05-28 | UAL806 | ICN → SFO | May 28, 02:35 UTC | May 28, 12:45 UTC | 10h 10m |
| 2026-05-27 | UAL805 | SFO → ICN | May 27, 07:10 UTC | May 27, 19:00 UTC | 11h 50m |
| 2026-05-26 | UAL1593 | LGA → DEN | May 26, 13:40 UTC | May 26, 19:05 UTC | 5h 25m |
| 2026-05-26 | UAL2303 | IAD → SAN | May 26, 06:29 UTC | May 26, 11:00 UTC | 4h 30m |
| 2026-05-25 | UAL199 | PVG → LAX | May 25, 12:40 UTC | May 25, 23:45 UTC | 11h 5m |
| 2026-05-24 | UAL198 | LAX → PVG | May 24, 20:45 UTC | May 25, 15:00 UTC | 18h 15m |
| 2026-05-22 | UAL153 | HKG → LAX | May 22, 04:55 UTC | May 22, 17:55 UTC | 13h 0m |
| 2026-05-22 | UAL153 | HKG → LAX | May 22, 02:15 UTC | May 22, 02:35 UTC | 20m |
| 2026-05-21 | UAL152 | LAX → HKG | May 21, 12:49 UTC | May 21, 14:48 UTC | 1h 59m |
| 2026-05-21 | UAL152 | LAX → HKG | May 21, 12:45 UTC | May 21, 13:01 UTC | 15m |
| 2026-05-21 | UAL152 | LAX → HKG | May 21, 09:30 UTC | May 21, 09:55 UTC | 25m |
| 2026-05-20 | UAL152 | LAX → HKG | May 20, 19:15 UTC | May 21, 08:55 UTC | 13h 40m |
| 2026-05-20 | UAL152 | LAX → HKG | May 20, 19:17 UTC | May 21, 09:52 UTC | 14h 35m |
| 2026-05-19 | UAL99 | MEL → LAX | May 19, 23:51 UTC | May 20, 13:29 UTC | 13h 38m |
| 2026-05-19 | UAL99 | MEL → LAX | May 19, 23:45 UTC | May 20, 01:40 UTC | 1h 55m |
| 2026-05-19 | UAL98 | LAX → MEL | May 19, 06:10 UTC | May 19, 21:35 UTC | 15h 25m |
| 2026-05-18 | UAL935 | LHR → LAX | May 18, 12:30 UTC | May 18, 23:00 UTC | 10h 29m |
| 2026-05-18 | UAL935 | LHR → LAX | May 18, 12:30 UTC | May 18, 22:58 UTC | 10h 28m |
| 2026-05-17 | UAL923 | LAX → LHR | May 17, 22:45 UTC | May 18, 08:25 UTC | 9h 40m |
| 2026-05-17 | UAL842 | SYD → LAX | May 17, 00:35 UTC | May 17, 13:50 UTC | 13h 15m |
| 2026-05-16 | UAL863 | SFO → SYD | May 16, 07:41 UTC | May 16, 22:08 UTC | 14h 27m |
| 2026-05-16 | UAL863 | SFO → SYD | May 16, 07:45 UTC | May 16, 22:10 UTC | 14h 25m |
| 2026-05-16 | UAL3909 | BRU → IAD | May 16, 02:00 UTC | May 16, 04:10 UTC | 2h 10m |
| 2026-05-14 | UAL761 | MUC → DEN | May 14, 14:30 UTC | May 15, 00:35 UTC | 10h 5m |
| 2026-05-14 | UAL760 | DEN → MUC | May 14, 02:40 UTC | May 14, 12:00 UTC | 9h 20m |
| 2026-05-13 | UAL142 | NRT → DEN | May 13, 07:55 UTC | May 13, 17:50 UTC | 9h 55m |
| 2026-05-12 | UAL7 | IAH → NRT | May 12, 15:45 UTC | May 13, 04:30 UTC | 12h 45m |
| 2026-05-12 | UAL63 | GRU → IAH | May 12, 10:10 UTC | May 12, 10:35 UTC | 25m |
| 2026-05-12 | UAL63 | GRU → IAH | May 12, 02:45 UTC | May 12, 08:00 UTC | 5h 15m |
| 2026-05-11 | UAL62 | IAH → GRU | May 11, 00:19 UTC | May 11, 09:45 UTC | 9h 25m |
| 2026-05-10 | UAL6 | NRT → IAH | May 10, 08:20 UTC | May 10, 19:35 UTC | 11h 15m |
| 2026-05-09 | UAL79 | EWR → NRT | May 9, 15:47 UTC | May 10, 04:32 UTC | 12h 45m |
| 2026-05-09 | UAL79 | EWR → NRT | May 9, 15:30 UTC | May 10, 04:34 UTC | 13h 5m |
| 2026-05-08 | UAL187 | JNB → EWR | May 8, 20:00 UTC | May 9, 11:15 UTC | 15h 15m |
| 2026-05-08 | UAL188 | EWR → JNB | May 8, 02:19 UTC | May 8, 16:20 UTC | 14h 0m |
| 2026-05-07 | UAL78 | NRT → EWR | May 7, 08:40 UTC | May 7, 20:40 UTC | 12h 0m |
| 2026-05-07 | UAL78 | NRT → EWR | May 7, 08:51 UTC | May 7, 20:39 UTC | 11h 48m |
| 2026-05-06 | UAL32 | LAX → NRT | May 6, 17:50 UTC | May 7, 04:35 UTC | 10h 45m |
| 2026-05-05 | UAL935 | LHR → LAX | May 5, 12:20 UTC | May 5, 22:40 UTC | 10h 20m |
| 2026-05-04 | UAL923 | LAX → LHR | May 4, 23:05 UTC | May 5, 09:00 UTC | 9h 55m |
| 2026-05-04 | UAL772 | DEN → DFW | May 4, 04:29 UTC | May 4, 15:53 UTC | 11h 24m |
| 2026-05-03 | UAL771 | BNA → ORD | May 3, 16:40 UTC | May 4, 07:05 UTC | 14h 25m |
| 2026-05-03 | UAL771 | BNA → ORD | May 3, 07:05 UTC | May 4, 07:00 UTC | 23h 55m |
| 2026-05-03 | UAL771 | BNA → ORD | May 3, 06:35 UTC | May 3, 19:00 UTC | 12h 25m |
| 2026-05-02 | UAL821 | SFO → MEX | May 2, 14:10 UTC | May 3, 03:00 UTC | 12h 50m |
| 2026-05-02 | UAL821 | SFO → MEX | May 2, 11:00 UTC | May 2, 11:05 UTC | 5m |
| 2026-05-02 | UAL821 | SFO → MEX | May 2, 08:55 UTC | May 2, 09:25 UTC | 30m |
| 2026-05-02 | UAL820 | MEX → SFO | May 2, 00:01 UTC | May 2, 02:16 UTC | 2h 15m |
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 N27959 page for operator, model, and routing details .