sensors Mode-S transponder
AA92F8
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N78001 · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- AA92F8
- Octal
- 52511370
- Decimal
- 11,178,744
- Country
- US
- Tail
- N78001
- Type
- B772
- Flights observed
- 173
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 23, 01:15 UTC
Last known position
Country allocation
The ICAO 24-bit address AA92F8 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 |
|---|---|---|---|
| UAL889 | - | 14 | 2026-07-16 |
| UAL888 | - | 12 | 2026-07-15 |
| UAL97 | - | 11 | 2026-07-12 |
| UAL969 | United Airlines | 8 | 2026-05-07 |
| UAL673 | - | 8 | 2026-07-17 |
| UAL949 | United Airlines | 7 | 2026-04-14 |
| UAL927 | - | 7 | 2026-07-05 |
| UAL968 | United Airlines | 6 | 2026-05-06 |
| UAL96 | - | 6 | 2026-07-11 |
| UAL926 | United Airlines | 6 | 2026-07-21 |
| UAL804 | - | 4 | 2026-07-04 |
| UAL57 | United Airlines | 4 | 2026-06-28 |
| UAL506 | - | 4 | 2026-07-10 |
| UAL131 | - | 4 | 2026-07-03 |
| UAL984 | - | 3 | 2026-06-29 |
| UAL919 | United Airlines | 3 | 2026-06-02 |
| UAL918 | United Airlines | 3 | 2026-06-01 |
| UAL875 | United Airlines | 3 | 2026-05-30 |
| UAL803 | United Airlines | 3 | 2026-06-04 |
| UAL672 | - | 3 | 2026-07-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | UAL3909 | BRU → IAD | Jul 22, 16:55 UTC | Jul 23, 01:10 UTC | 8h 15m |
| 2026-07-21 | UAL926 | SFO → FRA | Jul 21, 03:10 UTC | Jul 21, 13:20 UTC | 10h 10m |
| 2026-07-20 | UAL45 | ZRH → SFO | Jul 20, 12:36 UTC | Jul 20, 23:48 UTC | 11h 12m |
| 2026-07-20 | UAL45 | ZRH → SFO | Jul 20, 12:36 UTC | Jul 20, 23:56 UTC | 11h 20m |
| 2026-07-20 | UAL45 | ZRH → SFO | Jul 20, 12:30 UTC | Jul 20, 14:40 UTC | 2h 10m |
| 2026-07-19 | UAL44 | SFO → ZRH | Jul 19, 23:20 UTC | Jul 20, 09:20 UTC | 10h 0m |
| 2026-07-19 | UAL852 | TPE → SAN | Jul 19, 08:45 UTC | Jul 19, 18:20 UTC | 9h 35m |
| 2026-07-19 | UAL852 | TPE → SAN | Jul 19, 06:50 UTC | Jul 19, 07:10 UTC | 20m |
| 2026-07-18 | UAL853 | SFO → TPE | Jul 18, 07:26 UTC | Jul 18, 19:48 UTC | 12h 22m |
| 2026-07-18 | UAL853 | - | Jul 18, 07:30 UTC | Jul 18, 08:00 UTC | 30m |
| 2026-07-17 | UAL673 | - | Jul 17, 15:25 UTC | Jul 17, 17:25 UTC | 2h 0m |
| 2026-07-17 | UAL673 | BCN → SFO | Jul 17, 15:12 UTC | Jul 18, 02:58 UTC | 11h 46m |
| 2026-07-17 | UAL673 | BCN → SFO | Jul 17, 15:12 UTC | Jul 18, 02:44 UTC | 11h 32m |
| 2026-07-17 | UAL672 | SFO → BCN | Jul 17, 02:20 UTC | Jul 17, 12:55 UTC | 10h 35m |
| 2026-07-16 | UAL889 | - | Jul 16, 10:59 UTC | Jul 16, 12:55 UTC | 1h 55m |
| 2026-07-16 | UAL889 | PEK → SFO | Jul 16, 09:51 UTC | Jul 16, 21:35 UTC | 11h 44m |
| 2026-07-16 | UAL889 | - | Jul 16, 03:40 UTC | Jul 16, 21:40 UTC | 18h 0m |
| 2026-07-15 | UAL888 | SFO → PEK | Jul 15, 18:15 UTC | Jul 16, 07:07 UTC | 12h 52m |
| 2026-07-15 | UAL888 | - | Jul 15, 18:25 UTC | Jul 16, 06:00 UTC | 11h 35m |
| 2026-07-14 | UAL673 | BCN → SFO | Jul 14, 14:31 UTC | Jul 15, 01:39 UTC | 11h 8m |
| 2026-07-14 | UAL673 | - | Jul 14, 14:20 UTC | Jul 15, 01:50 UTC | 11h 29m |
| 2026-07-14 | UAL672 | SFO → BCN | Jul 14, 01:25 UTC | Jul 14, 11:50 UTC | 10h 25m |
| 2026-07-13 | UAL889 | - | Jul 13, 12:25 UTC | Jul 13, 23:05 UTC | 10h 40m |
| 2026-07-12 | UAL888 | - | Jul 12, 18:05 UTC | Jul 13, 05:31 UTC | 11h 25m |
| 2026-07-12 | UAL97 | BNE → SFO | Jul 12, 00:43 UTC | Jul 12, 13:02 UTC | 12h 19m |
| 2026-07-12 | UAL97 | - | Jul 12, 00:40 UTC | Jul 12, 13:05 UTC | 12h 25m |
| 2026-07-12 | UAL97 | BNE → SFO | Jul 12, 00:43 UTC | Jul 12, 13:01 UTC | 12h 18m |
| 2026-07-11 | UAL96 | SFO → BNE | Jul 11, 07:00 UTC | Jul 11, 21:00 UTC | 14h 0m |
| 2026-07-10 | UAL506 | - | Jul 10, 15:05 UTC | Jul 11, 03:25 UTC | 12h 20m |
| 2026-07-10 | UAL507 | SFO → FCO | Jul 10, 00:23 UTC | Jul 10, 11:47 UTC | 11h 24m |
| 2026-07-10 | UAL507 | - | Jul 10, 00:35 UTC | Jul 10, 03:20 UTC | 2h 45m |
| 2026-07-09 | UAL889 | - | Jul 9, 10:55 UTC | Jul 9, 12:50 UTC | 1h 55m |
| 2026-07-09 | UAL889 | PEK → SFO | Jul 9, 09:56 UTC | Jul 9, 21:11 UTC | 11h 15m |
| 2026-07-09 | UAL889 | - | Jul 9, 04:10 UTC | Jul 9, 21:15 UTC | 17h 5m |
| 2026-07-08 | UAL888 | SFO → PEK | Jul 8, 18:55 UTC | Jul 9, 07:36 UTC | 12h 41m |
| 2026-07-08 | UAL888 | - | Jul 8, 18:55 UTC | Jul 9, 06:00 UTC | 11h 5m |
| 2026-07-07 | UAL889 | PEK → SFO | Jul 7, 11:35 UTC | Jul 7, 21:50 UTC | 10h 15m |
| 2026-07-06 | UAL888 | SFO → PEK | Jul 6, 18:15 UTC | Jul 7, 07:02 UTC | 12h 47m |
| 2026-07-06 | UAL888 | SFO → PEK | Jul 6, 18:10 UTC | Jul 7, 04:00 UTC | 9h 50m |
| 2026-07-05 | UAL927 | - | Jul 5, 15:55 UTC | Jul 6, 03:10 UTC | 11h 15m |
| 2026-07-05 | UAL927 | FRA → SFO | Jul 5, 15:51 UTC | Jul 6, 03:03 UTC | 11h 12m |
| 2026-07-05 | UAL932 | IAD → FRA | Jul 5, 03:08 UTC | Jul 5, 10:29 UTC | 7h 21m |
| 2026-07-05 | UAL932 | - | Jul 5, 03:05 UTC | Jul 5, 05:05 UTC | 2h 0m |
| 2026-07-04 | UAL804 | HND → IAD | Jul 4, 08:15 UTC | Jul 4, 20:00 UTC | 11h 45m |
| 2026-07-03 | UAL131 | EWR → HND | Jul 3, 15:23 UTC | Jul 4, 05:45 UTC | 14h 22m |
| 2026-07-03 | UAL131 | - | Jul 3, 15:25 UTC | Jul 3, 23:20 UTC | 7h 55m |
| 2026-07-02 | UAL1333 | SFO → EWR | Jul 2, 21:20 UTC | Jul 3, 02:00 UTC | 4h 40m |
| 2026-07-02 | UAL673 | - | Jul 2, 06:45 UTC | Jul 2, 11:50 UTC | 5h 5m |
| 2026-07-01 | UAL673 | - | Jul 1, 18:25 UTC | Jul 1, 19:55 UTC | 1h 30m |
| 2026-07-01 | UAL673 | BCN → EWR | Jul 1, 17:36 UTC | Jul 2, 02:17 UTC | 8h 41m |
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 N78001 page for operator, model, and routing details .