sensors Mode-S transponder
AA6BC0
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N77022 · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- AA6BC0
- Octal
- 52465700
- Decimal
- 11,168,704
- Country
- US
- Tail
- N77022
- Type
- B772
- Flights observed
- 229
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 22:00 UTC
Last known position
Country allocation
The ICAO 24-bit address AA6BC0 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 |
|---|---|---|---|
| UAL888 | United Airlines | 11 | 2026-06-13 |
| UAL876 | United Airlines | 9 | 2026-07-26 |
| UAL852 | - | 9 | 2026-07-05 |
| UAL853 | - | 8 | 2026-07-04 |
| UAL148 | United Airlines | 8 | 2026-07-25 |
| UAL507 | United Airlines | 7 | 2026-07-22 |
| UAL506 | United Airlines | 7 | 2026-07-22 |
| UAL149 | United Airlines | 7 | 2026-07-24 |
| UAL131 | United Airlines | 7 | 2026-07-25 |
| UAL926 | - | 6 | 2026-07-07 |
| UAL889 | United Airlines | 6 | 2026-06-14 |
| UAL45 | - | 6 | 2026-07-06 |
| UAL927 | - | 5 | 2026-07-07 |
| UAL880 | - | 5 | 2026-07-14 |
| UAL59 | United Airlines | 5 | 2026-05-26 |
| UAL195 | - | 5 | 2026-07-16 |
| UAL949 | United Airlines | 4 | 2026-05-19 |
| UAL948 | United Airlines | 4 | 2026-05-19 |
| UAL917 | - | 4 | 2026-07-08 |
| UAL879 | - | 4 | 2026-07-15 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL44 | SFO → ZRH | Jul 26, 21:50 UTC | Jul 26, 22:00 UTC | 10m |
| 2026-07-26 | UAL876 | HND → SFO | Jul 26, 07:15 UTC | Jul 26, 16:35 UTC | 9h 20m |
| 2026-07-25 | UAL131 | EWR → HND | Jul 25, 14:50 UTC | Jul 26, 04:00 UTC | 13h 10m |
| 2026-07-25 | UAL148 | GRU → EWR | Jul 25, 00:20 UTC | Jul 25, 09:15 UTC | 8h 55m |
| 2026-07-24 | UAL149 | EWR → GRU | Jul 24, 01:16 UTC | Jul 24, 09:53 UTC | 8h 37m |
| 2026-07-24 | UAL149 | EWR → GRU | Jul 24, 01:10 UTC | Jul 24, 05:40 UTC | 4h 30m |
| 2026-07-23 | UAL1141 | HNL → SFO | Jul 23, 06:10 UTC | Jul 23, 10:45 UTC | 4h 35m |
| 2026-07-22 | UAL506 | MSN → DEN | Jul 22, 14:05 UTC | Jul 23, 02:20 UTC | 12h 15m |
| 2026-07-22 | UAL507 | DEN → LGA | Jul 22, 00:30 UTC | Jul 22, 11:40 UTC | 11h 10m |
| 2026-07-21 | UAL876 | HND → SFO | Jul 21, 10:00 UTC | Jul 21, 19:25 UTC | 9h 25m |
| 2026-07-20 | UAL131 | EWR → HND | Jul 20, 17:18 UTC | Jul 21, 07:44 UTC | 14h 26m |
| 2026-07-20 | UAL131 | EWR → HND | Jul 20, 17:10 UTC | Jul 21, 07:45 UTC | 14h 35m |
| 2026-07-20 | UAL148 | GRU → EWR | Jul 20, 00:15 UTC | Jul 20, 09:15 UTC | 9h 0m |
| 2026-07-19 | UAL149D | EWR → GRU | Jul 19, 12:35 UTC | Jul 19, 21:40 UTC | 9h 5m |
| 2026-07-18 | UAL1141 | HNL → SFO | Jul 18, 06:26 UTC | Jul 18, 10:59 UTC | 4h 33m |
| 2026-07-18 | UAL1141 | HNL → SFO | Jul 18, 06:20 UTC | Jul 18, 11:00 UTC | 4h 40m |
| 2026-07-17 | UAL506 | - | Jul 17, 14:50 UTC | Jul 17, 16:00 UTC | 1h 10m |
| 2026-07-17 | UAL506 | FCO → SFO | Jul 17, 14:07 UTC | Jul 18, 02:51 UTC | 12h 44m |
| 2026-07-17 | UAL507 | DEN → LGA | Jul 17, 00:30 UTC | Jul 17, 11:37 UTC | 11h 7m |
| 2026-07-17 | UAL507 | DEN → LGA | Jul 17, 00:40 UTC | Jul 17, 11:45 UTC | 11h 5m |
| 2026-07-16 | UAL195 | - | Jul 16, 10:29 UTC | Jul 16, 21:35 UTC | 11h 5m |
| 2026-07-16 | UAL195 | MUC → SFO | Jul 16, 10:02 UTC | Jul 16, 21:35 UTC | 11h 33m |
| 2026-07-15 | UAL102 | - | Jul 15, 22:35 UTC | Jul 16, 08:10 UTC | 9h 35m |
| 2026-07-15 | UAL102 | IAH → MUC | Jul 15, 22:37 UTC | Jul 16, 08:06 UTC | 9h 29m |
| 2026-07-15 | UAL879 | - | Jul 15, 10:05 UTC | Jul 15, 19:35 UTC | 9h 30m |
| 2026-07-14 | UAL880 | - | Jul 14, 22:00 UTC | Jul 15, 07:25 UTC | 9h 24m |
| 2026-07-14 | UAL818 | - | Jul 14, 00:20 UTC | Jul 14, 01:30 UTC | 1h 10m |
| 2026-07-14 | UAL818 | EZE → IAH | Jul 14, 00:16 UTC | Jul 14, 10:01 UTC | 9h 45m |
| 2026-07-13 | UAL819 | - | Jul 13, 01:40 UTC | Jul 13, 10:45 UTC | 9h 5m |
| 2026-07-12 | UAL47 | FRA → IAH | Jul 12, 12:26 UTC | Jul 12, 22:31 UTC | 10h 5m |
| 2026-07-12 | UAL47 | - | Jul 12, 12:35 UTC | Jul 12, 14:01 UTC | 1h 25m |
| 2026-07-12 | UAL46 | - | Jul 12, 00:05 UTC | Jul 12, 09:55 UTC | 9h 50m |
| 2026-07-10 | UAL160 | - | Jul 10, 11:05 UTC | Jul 10, 21:45 UTC | 10h 40m |
| 2026-07-09 | UAL194 | SFO → MUC | Jul 9, 22:13 UTC | Jul 10, 08:56 UTC | 10h 43m |
| 2026-07-09 | UAL194 | - | Jul 9, 22:30 UTC | Jul 10, 08:00 UTC | 9h 30m |
| 2026-07-09 | UAL916 | - | Jul 9, 02:15 UTC | Jul 9, 13:45 UTC | 11h 30m |
| 2026-07-08 | UAL917 | SFO → AKL | Jul 8, 06:36 UTC | Jul 8, 19:00 UTC | 12h 24m |
| 2026-07-08 | UAL917 | - | Jul 8, 06:40 UTC | Jul 8, 07:10 UTC | 30m |
| 2026-07-07 | UAL927 | - | Jul 7, 15:50 UTC | Jul 8, 02:50 UTC | 11h 0m |
| 2026-07-07 | UAL926 | SFO → FRA | Jul 7, 02:44 UTC | Jul 7, 12:53 UTC | 10h 9m |
| 2026-07-07 | UAL926 | - | Jul 7, 02:45 UTC | Jul 7, 05:40 UTC | 2h 55m |
| 2026-07-06 | UAL45 | ZRH → SFO | Jul 6, 12:22 UTC | Jul 6, 23:36 UTC | 11h 14m |
| 2026-07-06 | UAL45 | - | Jul 6, 12:10 UTC | Jul 6, 15:45 UTC | 3h 35m |
| 2026-07-05 | UAL44 | SFO → ZRH | Jul 5, 21:50 UTC | Jul 6, 08:10 UTC | 10h 20m |
| 2026-07-05 | UAL852 | - | Jul 5, 08:20 UTC | Jul 5, 09:30 UTC | 1h 10m |
| 2026-07-05 | UAL852 | TPE → SFO | Jul 5, 06:51 UTC | Jul 5, 17:55 UTC | 11h 4m |
| 2026-07-05 | UAL852 | - | Jul 5, 06:40 UTC | Jul 5, 06:55 UTC | 15m |
| 2026-07-04 | UAL853 | - | Jul 4, 19:50 UTC | Jul 4, 20:00 UTC | 10m |
| 2026-07-04 | UAL853 | - | Jul 4, 07:35 UTC | Jul 4, 19:05 UTC | 11h 30m |
| 2026-07-03 | UAL927 | FRA → SFO | Jul 3, 15:51 UTC | Jul 4, 02:38 UTC | 10h 47m |
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 N77022 page for operator, model, and routing details .