sensors Mode-S transponder
AA92FB
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N78004 · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- AA92FB
- Octal
- 52511373
- Decimal
- 11,178,747
- Country
- US
- Tail
- N78004
- Type
- B772
- Flights observed
- 126
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Current position
Country allocation
The ICAO 24-bit address AA92FB 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 |
|---|---|---|---|
| UAL41 | United Airlines | 9 | 2026-04-19 |
| UAL915 | United Airlines | 8 | 2026-04-25 |
| UAL40 | United Airlines | 7 | 2026-04-26 |
| UAL990 | United Airlines | 6 | 2026-04-20 |
| UAL900 | United Airlines | 6 | 2026-04-16 |
| UAL131 | United Airlines | 6 | 2026-05-26 |
| UAL804 | United Airlines | 5 | 2026-05-22 |
| UAL56 | United Airlines | 5 | 2026-04-26 |
| UAL901 | United Airlines | 4 | 2026-04-16 |
| UAL876 | United Airlines | 4 | 2026-05-27 |
| UAL803 | United Airlines | 4 | 2026-05-23 |
| UAL2004 | United Airlines | 4 | 2026-04-15 |
| UAL149 | United Airlines | 4 | 2026-05-25 |
| UAL148 | United Airlines | 4 | 2026-05-26 |
| UAL914 | United Airlines | 3 | 2026-04-21 |
| UAL875 | United Airlines | 3 | 2026-05-21 |
| UAL59 | United Airlines | 3 | 2026-05-28 |
| UAL58 | United Airlines | 3 | 2026-05-27 |
| UAL2397 | United Airlines | 3 | 2026-04-14 |
| UAL130 | United Airlines | 3 | 2026-05-24 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL673 | SFO → BOS | May 29, 14:40 UTC | May 30, 00:45 UTC | 10h 5m |
| 2026-05-29 | UAL672 | EWR → ATL | May 29, 01:20 UTC | May 29, 12:10 UTC | 10h 50m |
| 2026-05-28 | UAL59 | FRA → SFO | May 28, 11:40 UTC | May 28, 22:35 UTC | 10h 55m |
| 2026-05-28 | UAL59 | FRA → SFO | May 28, 11:24 UTC | May 28, 22:29 UTC | 11h 5m |
| 2026-05-27 | UAL58 | SFO → FRA | May 27, 21:22 UTC | May 28, 07:37 UTC | 10h 15m |
| 2026-05-27 | UAL58 | SFO → FRA | May 27, 21:30 UTC | May 28, 07:50 UTC | 10h 20m |
| 2026-05-27 | UAL876 | HND → SFO | May 27, 07:10 UTC | May 27, 16:50 UTC | 9h 40m |
| 2026-05-26 | UAL131 | EWR → HND | May 26, 14:55 UTC | May 27, 04:24 UTC | 13h 30m |
| 2026-05-26 | UAL148 | GRU → EWR | May 26, 00:21 UTC | May 26, 09:25 UTC | 9h 4m |
| 2026-05-26 | UAL148 | GRU → EWR | May 26, 00:04 UTC | May 26, 00:35 UTC | 30m |
| 2026-05-25 | UAL149 | EWR → GRU | May 25, 01:36 UTC | May 25, 10:12 UTC | 8h 36m |
| 2026-05-24 | UAL130 | HND → EWR | May 24, 09:55 UTC | May 24, 21:50 UTC | 11h 55m |
| 2026-05-23 | UAL803 | IAD → HND | May 23, 17:30 UTC | May 24, 06:30 UTC | 13h 0m |
| 2026-05-22 | UAL804 | HND → IAD | May 22, 07:15 UTC | May 22, 18:55 UTC | 11h 40m |
| 2026-05-21 | UAL875 | SFO → HND | May 21, 18:45 UTC | May 22, 05:15 UTC | 10h 30m |
| 2026-05-21 | UAL875 | SFO → HND | May 21, 18:25 UTC | May 22, 05:18 UTC | 10h 53m |
| 2026-05-19 | UAL889 | PEK → SFO | May 19, 10:35 UTC | May 19, 20:35 UTC | 10h 0m |
| 2026-05-19 | UAL889 | PEK → SFO | May 19, 09:40 UTC | May 19, 09:50 UTC | 10m |
| 2026-05-18 | UAL888 | SFO → PEK | May 18, 18:15 UTC | May 19, 07:33 UTC | 13h 18m |
| 2026-05-18 | UAL888 | SFO → PEK | May 18, 18:20 UTC | May 19, 06:15 UTC | 11h 54m |
| 2026-05-17 | UAL59 | FRA → SFO | May 17, 11:10 UTC | May 17, 21:40 UTC | 10h 30m |
| 2026-05-16 | UAL58 | SFO → FRA | May 16, 21:05 UTC | May 17, 07:10 UTC | 10h 5m |
| 2026-05-16 | UAL876 | HND → SFO | May 16, 07:15 UTC | May 16, 15:46 UTC | 8h 31m |
| 2026-05-16 | UAL876 | HND → SFO | May 16, 07:11 UTC | May 16, 07:45 UTC | 35m |
| 2026-05-15 | UAL131 | EWR → HND | May 15, 14:15 UTC | May 16, 03:35 UTC | 13h 19m |
| 2026-05-15 | UAL148 | GRU → EWR | May 15, 00:20 UTC | May 15, 09:40 UTC | 9h 20m |
| 2026-05-14 | UAL149 | EWR → GRU | May 14, 01:01 UTC | May 14, 09:49 UTC | 8h 48m |
| 2026-05-14 | UAL149 | EWR → GRU | May 14, 01:00 UTC | May 14, 10:10 UTC | 9h 10m |
| 2026-05-13 | UAL130 | HND → EWR | May 13, 09:45 UTC | May 13, 21:40 UTC | 11h 55m |
| 2026-05-12 | UAL803 | IAD → HND | May 12, 17:00 UTC | May 13, 06:30 UTC | 13h 30m |
| 2026-05-11 | UAL804 | HND → IAD | May 11, 07:10 UTC | May 11, 19:14 UTC | 12h 4m |
| 2026-05-11 | UAL804 | HND → IAD | May 11, 07:10 UTC | May 11, 19:15 UTC | 12h 6m |
| 2026-05-10 | UAL131 | EWR → HND | May 10, 14:28 UTC | May 11, 03:40 UTC | 13h 12m |
| 2026-05-10 | UAL131 | EWR → HND | May 10, 14:25 UTC | May 10, 15:39 UTC | 1h 15m |
| 2026-05-10 | UAL3933 | PWM → MCO | May 10, 06:21 UTC | May 10, 11:07 UTC | 4h 46m |
| 2026-05-10 | UAL3933 | PWM → MCO | May 10, 06:30 UTC | May 10, 11:05 UTC | 4h 35m |
| 2026-05-08 | UAL45 | ZRH → SFO | May 8, 12:22 UTC | May 8, 23:44 UTC | 11h 22m |
| 2026-05-08 | UAL45 | ZRH → SFO | May 8, 12:30 UTC | May 8, 23:45 UTC | 11h 15m |
| 2026-05-07 | UAL44 | SFO → ZRH | May 7, 20:42 UTC | May 8, 07:35 UTC | 10h 53m |
| 2026-05-07 | UAL44 | SFO → ZRH | May 7, 21:00 UTC | May 8, 00:09 UTC | 3h 9m |
| 2026-05-07 | UAL876 | HND → SFO | May 7, 07:15 UTC | May 7, 16:20 UTC | 9h 5m |
| 2026-05-06 | UAL131 | EWR → HND | May 6, 15:08 UTC | May 7, 04:15 UTC | 13h 7m |
| 2026-05-06 | UAL131 | EWR → HND | May 6, 14:55 UTC | May 6, 22:05 UTC | 7h 10m |
| 2026-05-06 | UAL148 | GRU → EWR | May 6, 00:15 UTC | May 6, 09:15 UTC | 9h 0m |
| 2026-05-05 | UAL149 | EWR → GRU | May 5, 00:50 UTC | May 5, 09:55 UTC | 9h 5m |
| 2026-05-04 | UAL130 | HND → EWR | May 4, 09:10 UTC | May 4, 21:25 UTC | 12h 16m |
| 2026-05-03 | UAL803 | IAD → HND | May 3, 16:50 UTC | May 4, 06:52 UTC | 14h 2m |
| 2026-05-03 | UAL803 | IAD → HND | May 3, 16:45 UTC | May 4, 00:10 UTC | 7h 25m |
| 2026-05-02 | UAL804 | HND → IAD | May 2, 07:10 UTC | May 2, 19:30 UTC | 12h 20m |
| 2026-05-02 | UAL804 | HND → IAD | May 2, 07:15 UTC | May 2, 19:35 UTC | 12h 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 N78004 page for operator, model, and routing details .