sensors Mode-S transponder
A2007C
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N228UA · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- A2007C
- Octal
- 50400174
- Decimal
- 10,616,956
- Country
- US
- Tail
- N228UA
- Type
- B772
- Flights observed
- 210
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 9h ago
Last known position
Country allocation
The ICAO 24-bit address A2007C 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 |
|---|---|---|---|
| UAL943 | United Airlines | 11 | 2026-05-31 |
| UAL942 | United Airlines | 9 | 2026-05-31 |
| UAL35 | - | 9 | 2026-06-30 |
| UAL34 | - | 9 | 2026-07-01 |
| UAL924 | United Airlines | 8 | 2026-06-01 |
| UAL853 | - | 7 | 2026-07-07 |
| UAL852 | - | 7 | 2026-07-08 |
| UAL4 | United Airlines | 7 | 2026-05-29 |
| UAL195 | United Airlines | 7 | 2026-06-29 |
| UAL932 | United Airlines | 6 | 2026-05-19 |
| UAL880 | United Airlines | 6 | 2026-06-27 |
| UAL102 | - | 6 | 2026-06-28 |
| UAL990 | United Airlines | 5 | 2026-05-27 |
| UAL927 | United Airlines | 5 | 2026-06-11 |
| UAL926 | - | 5 | 2026-07-10 |
| UAL889 | United Airlines | 5 | 2026-07-06 |
| UAL876 | - | 5 | 2026-06-22 |
| UAL59 | - | 5 | 2026-07-13 |
| UAL44 | - | 5 | 2026-07-08 |
| UAL968 | - | 4 | 2026-06-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | UAL59 | - | Jul 13, 11:20 UTC | Jul 13, 22:30 UTC | 11h 10m |
| 2026-07-13 | UAL59 | FRA → SFO | Jul 13, 11:24 UTC | Jul 13, 22:26 UTC | 11h 2m |
| 2026-07-12 | UAL58 | SFO → FRA | Jul 12, 21:05 UTC | Jul 13, 07:05 UTC | 10h 0m |
| 2026-07-10 | UAL926 | SFO → SFO | Jul 10, 02:40 UTC | Jul 10, 03:35 UTC | 55m |
| 2026-07-09 | UAL45 | - | Jul 9, 12:25 UTC | Jul 9, 23:40 UTC | 11h 15m |
| 2026-07-08 | UAL44 | SFO → ZRH | Jul 8, 21:58 UTC | Jul 9, 08:28 UTC | 10h 30m |
| 2026-07-08 | UAL44 | SFO → ZRH | Jul 8, 22:00 UTC | Jul 9, 08:35 UTC | 10h 35m |
| 2026-07-08 | UAL852 | TPE → SFO | Jul 8, 06:51 UTC | Jul 8, 17:53 UTC | 11h 2m |
| 2026-07-08 | UAL852 | - | Jul 8, 06:30 UTC | Jul 8, 17:55 UTC | 11h 25m |
| 2026-07-07 | UAL853 | - | Jul 7, 19:45 UTC | Jul 7, 20:10 UTC | 25m |
| 2026-07-07 | UAL853 | - | Jul 7, 07:45 UTC | Jul 7, 18:40 UTC | 10h 55m |
| 2026-07-06 | UAL889 | PEK → SFO | Jul 6, 10:05 UTC | Jul 6, 10:15 UTC | 10m |
| 2026-07-06 | UAL889 | PEK → SFO | Jul 6, 09:51 UTC | Jul 6, 21:16 UTC | 11h 25m |
| 2026-07-05 | UAL888 | SFO → PEK | Jul 5, 18:20 UTC | Jul 6, 06:00 UTC | 11h 40m |
| 2026-07-05 | UAL97 | BNE → SFO | Jul 5, 01:08 UTC | Jul 5, 13:20 UTC | 12h 12m |
| 2026-07-05 | UAL97 | - | Jul 5, 01:15 UTC | Jul 5, 13:25 UTC | 12h 10m |
| 2026-07-05 | UAL97 | BNE → SFO | Jul 5, 01:08 UTC | Jul 5, 13:23 UTC | 12h 15m |
| 2026-07-04 | UAL96 | SFO → BNE | Jul 4, 06:50 UTC | Jul 4, 20:15 UTC | 13h 25m |
| 2026-07-03 | UAL852 | TPE → SFO | Jul 3, 06:51 UTC | Jul 3, 17:43 UTC | 10h 52m |
| 2026-07-03 | UAL852 | - | Jul 3, 06:40 UTC | Jul 3, 06:55 UTC | 15m |
| 2026-07-02 | UAL853 | - | Jul 2, 19:35 UTC | Jul 2, 19:55 UTC | 20m |
| 2026-07-02 | UAL853 | - | Jul 2, 07:30 UTC | Jul 2, 07:55 UTC | 25m |
| 2026-07-01 | UAL34 | - | Jul 1, 11:25 UTC | Jul 1, 20:45 UTC | 9h 20m |
| 2026-07-01 | UAL34 | KIX → SFO | Jul 1, 11:15 UTC | Jul 1, 20:29 UTC | 9h 14m |
| 2026-06-30 | UAL35 | - | Jun 30, 19:10 UTC | Jul 1, 06:05 UTC | 10h 55m |
| 2026-06-30 | UAL35 | SFO → KIX | Jun 30, 18:35 UTC | Jul 1, 05:55 UTC | 11h 20m |
| 2026-06-29 | UAL195 | MUC → SFO | Jun 29, 10:04 UTC | Jun 29, 16:59 UTC | 6h 55m |
| 2026-06-29 | UAL195 | MUC → SFO | Jun 29, 10:02 UTC | Jun 29, 20:34 UTC | 10h 32m |
| 2026-06-29 | UAL195 | MUC → SFO | Jun 29, 10:02 UTC | Jun 29, 20:39 UTC | 10h 37m |
| 2026-06-28 | UAL102 | - | Jun 28, 21:59 UTC | Jun 29, 07:34 UTC | 9h 35m |
| 2026-06-28 | UAL879 | - | Jun 28, 09:45 UTC | Jun 28, 19:04 UTC | 9h 20m |
| 2026-06-27 | UAL880 | IAH → LHR | Jun 27, 22:15 UTC | Jun 28, 06:59 UTC | 8h 45m |
| 2026-06-27 | UAL880 | IAH → LHR | Jun 27, 22:22 UTC | Jun 28, 06:53 UTC | 8h 31m |
| 2026-06-26 | UAL160 | - | Jun 26, 11:30 UTC | Jun 26, 21:55 UTC | 10h 25m |
| 2026-06-25 | UAL194 | SFO → MUC | Jun 25, 21:28 UTC | Jun 26, 08:04 UTC | 10h 36m |
| 2026-06-25 | UAL194 | - | Jun 25, 21:29 UTC | Jun 26, 07:00 UTC | 9h 30m |
| 2026-06-24 | UAL673 | - | Jun 24, 14:29 UTC | Jun 25, 01:44 UTC | 11h 15m |
| 2026-06-24 | UAL672 | SFO → BCN | Jun 24, 01:29 UTC | Jun 24, 12:01 UTC | 10h 32m |
| 2026-06-24 | UAL672 | - | Jun 24, 01:19 UTC | Jun 24, 06:39 UTC | 5h 20m |
| 2026-06-23 | UAL59 | - | Jun 23, 11:19 UTC | Jun 23, 22:19 UTC | 11h 0m |
| 2026-06-22 | UAL58 | SFO → FRA | Jun 22, 21:22 UTC | Jun 23, 07:12 UTC | 9h 50m |
| 2026-06-22 | UAL58 | SFO → FRA | Jun 22, 21:14 UTC | Jun 23, 07:25 UTC | 10h 10m |
| 2026-06-22 | UAL876 | - | Jun 22, 07:40 UTC | Jun 22, 16:50 UTC | 9h 10m |
| 2026-06-21 | UAL875 | SFO → HND | Jun 21, 18:14 UTC | Jun 22, 04:24 UTC | 10h 10m |
| 2026-06-20 | UAL59 | - | Jun 20, 11:30 UTC | Jun 20, 13:09 UTC | 1h 40m |
| 2026-06-20 | UAL59 | FRA → SFO | Jun 20, 11:29 UTC | Jun 20, 22:20 UTC | 10h 51m |
| 2026-06-19 | UAL58 | - | Jun 19, 21:14 UTC | Jun 20, 07:19 UTC | 10h 5m |
| 2026-06-19 | UAL852 | - | Jun 19, 06:44 UTC | Jun 19, 17:55 UTC | 11h 10m |
| 2026-06-18 | UAL853 | SFO → TPE | Jun 18, 07:25 UTC | Jun 18, 19:35 UTC | 12h 10m |
| 2026-06-17 | UAL969 | AMS → SFO | Jun 17, 13:30 UTC | Jun 17, 23:50 UTC | 10h 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 N228UA page for operator, model, and routing details .