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
- 95
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 4h ago
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 | 9 | 2026-05-17 |
| UAL59 | United Airlines | 5 | 2026-05-26 |
| UAL949 | United Airlines | 4 | 2026-05-19 |
| UAL948 | United Airlines | 4 | 2026-05-19 |
| UAL889 | United Airlines | 4 | 2026-05-18 |
| UAL853 | United Airlines | 4 | 2026-05-03 |
| UAL852 | United Airlines | 4 | 2026-05-04 |
| UAL672 | United Airlines | 4 | 2026-05-12 |
| UAL23 | United Airlines | 4 | 2026-05-23 |
| UAL1777 | United Airlines | 4 | 2026-05-23 |
| UAL58 | United Airlines | 3 | 2026-05-25 |
| UAL22 | United Airlines | 3 | 2026-05-23 |
| UAL19 | United Airlines | 3 | 2026-05-21 |
| UAL18 | United Airlines | 3 | 2026-05-22 |
| UAL148 | United Airlines | 3 | 2026-05-10 |
| UAL968 | United Airlines | 2 | 2026-05-27 |
| UAL917 | United Airlines | 2 | 2026-05-13 |
| UAL916 | United Airlines | 2 | 2026-05-14 |
| UAL915 | United Airlines | 2 | 2026-05-05 |
| UAL901 | United Airlines | 2 | 2026-04-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL804 | HND → IAD | May 29, 08:40 UTC | May 29, 20:15 UTC | 11h 35m |
| 2026-05-28 | UAL875 | SFO → HND | May 28, 18:25 UTC | May 29, 05:10 UTC | 10h 45m |
| 2026-05-27 | UAL969 | AMS → SFO | May 27, 13:45 UTC | May 28, 00:15 UTC | 10h 30m |
| 2026-05-27 | UAL968 | SFO → AMS | May 27, 00:47 UTC | May 27, 10:31 UTC | 9h 44m |
| 2026-05-27 | UAL968 | SFO → AMS | May 27, 00:55 UTC | May 27, 10:45 UTC | 9h 50m |
| 2026-05-26 | UAL59 | FRA → SFO | May 26, 11:15 UTC | May 26, 22:15 UTC | 11h 0m |
| 2026-05-25 | UAL58 | SFO → FRA | May 25, 21:45 UTC | May 26, 07:55 UTC | 10h 10m |
| 2026-05-25 | UAL876 | HND → SFO | May 25, 07:10 UTC | May 25, 16:10 UTC | 9h 0m |
| 2026-05-24 | UAL131 | EWR → HND | May 24, 15:00 UTC | May 25, 03:40 UTC | 12h 40m |
| 2026-05-24 | UAL1141 | HNL → SFO | May 24, 06:00 UTC | May 24, 10:35 UTC | 4h 35m |
| 2026-05-23 | UAL1777 | EWR → IAH | May 23, 17:27 UTC | May 23, 22:31 UTC | 5h 4m |
| 2026-05-23 | UAL1777 | EWR → IAH | May 23, 17:35 UTC | May 23, 22:45 UTC | 5h 11m |
| 2026-05-23 | UAL22 | DUB → EWR | May 23, 08:35 UTC | May 23, 15:15 UTC | 6h 40m |
| 2026-05-23 | UAL22 | DUB → EWR | May 23, 08:50 UTC | May 23, 15:18 UTC | 6h 28m |
| 2026-05-23 | UAL23 | EWR → DUB | May 23, 00:15 UTC | May 23, 05:54 UTC | 5h 39m |
| 2026-05-23 | UAL23 | EWR → DUB | May 23, 00:25 UTC | May 23, 06:00 UTC | 5h 34m |
| 2026-05-22 | UAL18 | MXP → EWR | May 22, 09:10 UTC | May 22, 17:20 UTC | 8h 10m |
| 2026-05-22 | UAL18 | MXP → EWR | May 22, 09:06 UTC | May 22, 17:21 UTC | 8h 15m |
| 2026-05-21 | UAL19 | EWR → MXP | May 21, 22:05 UTC | May 22, 04:55 UTC | 6h 50m |
| 2026-05-21 | UAL22 | DUB → EWR | May 21, 11:10 UTC | May 21, 17:50 UTC | 6h 40m |
| 2026-05-21 | UAL23 | EWR → DUB | May 21, 01:30 UTC | May 21, 08:35 UTC | 7h 5m |
| 2026-05-21 | UAL23 | EWR → DUB | May 21, 03:00 UTC | May 21, 04:20 UTC | 1h 20m |
| 2026-05-20 | UAL435 | KOA → SFO | May 20, 16:15 UTC | May 20, 21:00 UTC | 4h 45m |
| 2026-05-19 | UAL949 | LHR → SFO | May 19, 12:25 UTC | May 19, 22:30 UTC | 10h 5m |
| 2026-05-19 | UAL949 | LHR → SFO | May 19, 12:25 UTC | May 19, 22:25 UTC | 10h 0m |
| 2026-05-19 | UAL948 | SFO → LHR | May 19, 00:10 UTC | May 19, 10:00 UTC | 9h 50m |
| 2026-05-18 | UAL948 | SFO → LHR | May 18, 23:59 UTC | May 19, 10:07 UTC | 10h 8m |
| 2026-05-18 | UAL889 | PEK → SFO | May 18, 10:55 UTC | May 18, 21:05 UTC | 10h 9m |
| 2026-05-17 | UAL888 | SFO → PEK | May 17, 17:50 UTC | May 18, 06:38 UTC | 12h 48m |
| 2026-05-17 | UAL888 | SFO → PEK | May 17, 17:35 UTC | May 17, 22:45 UTC | 5h 10m |
| 2026-05-16 | UAL506 | MSN → DEN | May 16, 14:01 UTC | May 17, 01:45 UTC | 11h 44m |
| 2026-05-16 | UAL507 | DEN → LGA | May 16, 00:10 UTC | May 16, 11:25 UTC | 11h 16m |
| 2026-05-15 | UAL889 | PEK → SFO | May 15, 09:51 UTC | May 15, 21:05 UTC | 11h 14m |
| 2026-05-14 | UAL888 | SFO → PEK | May 14, 22:05 UTC | May 15, 21:10 UTC | 23h 4m |
| 2026-05-14 | UAL888 | SFO → PEK | May 14, 18:05 UTC | May 15, 12:40 UTC | 18h 35m |
| 2026-05-14 | UAL888 | SFO → PEK | May 14, 17:50 UTC | May 15, 06:13 UTC | 12h 23m |
| 2026-05-14 | UAL888 | SFO → PEK | May 14, 17:40 UTC | May 15, 12:40 UTC | 19h 0m |
| 2026-05-14 | UAL916 | AKL → SFO | May 14, 02:11 UTC | May 14, 13:35 UTC | 11h 24m |
| 2026-05-14 | UAL916 | AKL → SFO | May 14, 01:55 UTC | May 14, 13:35 UTC | 11h 40m |
| 2026-05-13 | UAL917 | SFO → AKL | May 13, 06:16 UTC | May 13, 19:01 UTC | 12h 45m |
| 2026-05-13 | UAL917 | SFO → AKL | May 13, 06:20 UTC | May 13, 06:50 UTC | 30m |
| 2026-05-12 | UAL673 | SFO → BOS | May 12, 14:20 UTC | May 13, 02:05 UTC | 11h 45m |
| 2026-05-12 | UAL672 | EWR → ATL | May 12, 02:50 UTC | May 12, 12:00 UTC | 9h 10m |
| 2026-05-12 | UAL672 | EWR → ATL | May 12, 01:09 UTC | May 12, 12:06 UTC | 10h 57m |
| 2026-05-11 | UAL59 | FRA → SFO | May 11, 11:10 UTC | May 11, 12:55 UTC | 1h 45m |
| 2026-05-11 | UAL59 | FRA → SFO | May 11, 11:14 UTC | May 11, 22:05 UTC | 10h 51m |
| 2026-05-10 | UAL58 | SFO → FRA | May 10, 20:54 UTC | May 11, 07:15 UTC | 10h 20m |
| 2026-05-10 | UAL1777 | EWR → IAH | May 10, 12:27 UTC | May 10, 18:04 UTC | 5h 37m |
| 2026-05-10 | UAL1777 | EWR → IAH | May 10, 12:49 UTC | May 10, 18:15 UTC | 5h 25m |
| 2026-05-10 | UAL148 | GRU → EWR | May 10, 00:09 UTC | May 10, 00:49 UTC | 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 N77022 page for operator, model, and routing details .