sensors Mode-S transponder
AA441C
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N76010 · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- AA441C
- Octal
- 52442034
- Decimal
- 11,158,556
- Country
- US
- Tail
- N76010
- Type
- B772
- Flights observed
- 229
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 22:25 UTC
Last known position
Country allocation
The ICAO 24-bit address AA441C 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 |
|---|---|---|---|
| UAL673 | - | 10 | 2026-07-09 |
| UAL943 | United Airlines | 8 | 2026-06-25 |
| UAL888 | United Airlines | 8 | 2026-07-26 |
| UAL984 | United Airlines | 7 | 2026-05-17 |
| UAL918 | United Airlines | 7 | 2026-06-03 |
| UAL506 | United Airlines | 7 | 2026-05-03 |
| UAL942 | - | 6 | 2026-06-25 |
| UAL889 | - | 6 | 2026-07-11 |
| UAL875 | - | 6 | 2026-06-16 |
| UAL804 | - | 6 | 2026-06-17 |
| UAL97 | United Airlines | 5 | 2026-07-26 |
| UAL925 | - | 5 | 2026-07-16 |
| UAL884 | - | 5 | 2026-06-29 |
| UAL876 | United Airlines | 5 | 2026-07-24 |
| UAL672 | - | 5 | 2026-07-09 |
| UAL58 | United Airlines | 5 | 2026-05-29 |
| UAL507 | United Airlines | 5 | 2026-05-03 |
| UAL96 | United Airlines | 4 | 2026-07-25 |
| UAL919 | - | 4 | 2026-06-29 |
| UAL885 | - | 4 | 2026-06-30 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL888 | SFO → PEK | Jul 26, 18:20 UTC | Jul 26, 22:25 UTC | 4h 5m |
| 2026-07-26 | UAL97 | BNE → SFO | Jul 26, 00:50 UTC | Jul 26, 13:35 UTC | 12h 46m |
| 2026-07-26 | UAL97 | BNE → SFO | Jul 26, 00:43 UTC | Jul 26, 13:30 UTC | 12h 47m |
| 2026-07-25 | UAL96 | SFO → BNE | Jul 25, 07:30 UTC | Jul 25, 20:45 UTC | 13h 15m |
| 2026-07-24 | UAL876 | HND → SFO | Jul 24, 07:10 UTC | Jul 24, 16:55 UTC | 9h 45m |
| 2026-07-23 | UAL131 | EWR → HND | Jul 23, 15:05 UTC | Jul 24, 04:40 UTC | 13h 35m |
| 2026-07-23 | UAL148 | GRU → EWR | Jul 23, 00:20 UTC | Jul 23, 09:15 UTC | 8h 55m |
| 2026-07-22 | UAL149 | EWR → GRU | Jul 22, 04:25 UTC | Jul 22, 13:15 UTC | 8h 50m |
| 2026-07-22 | UAL149 | EWR → GRU | Jul 22, 04:11 UTC | Jul 22, 13:10 UTC | 8h 59m |
| 2026-07-21 | UAL71 | AMS → EWR | Jul 21, 10:15 UTC | Jul 21, 17:45 UTC | 7h 30m |
| 2026-07-21 | UAL71 | AMS → EWR | Jul 21, 09:47 UTC | Jul 21, 17:57 UTC | 8h 10m |
| 2026-07-20 | UAL70 | - | Jul 20, 23:00 UTC | Jul 21, 05:45 UTC | 6h 45m |
| 2026-07-20 | UAL121 | BCN → EWR | Jul 20, 10:30 UTC | Jul 20, 18:40 UTC | 8h 10m |
| 2026-07-20 | UAL120 | EWR → BCN | Jul 20, 00:35 UTC | Jul 20, 07:35 UTC | 7h 0m |
| 2026-07-19 | UAL3016 | OGG → SFO | Jul 19, 18:40 UTC | Jul 19, 19:30 UTC | 50m |
| 2026-07-18 | UAL130 | HND → EWR | Jul 18, 09:20 UTC | Jul 18, 22:00 UTC | 12h 40m |
| 2026-07-17 | UAL803 | IAD → HND | Jul 17, 17:09 UTC | Jul 18, 06:15 UTC | 13h 6m |
| 2026-07-16 | UAL925 | - | Jul 16, 23:25 UTC | Jul 16, 23:40 UTC | 15m |
| 2026-07-16 | UAL925 | - | Jul 16, 16:09 UTC | Jul 16, 23:20 UTC | 7h 10m |
| 2026-07-16 | UAL5 | - | Jul 16, 02:05 UTC | Jul 16, 11:15 UTC | 9h 10m |
| 2026-07-15 | UAL47 | - | Jul 15, 13:00 UTC | Jul 15, 22:55 UTC | 9h 55m |
| 2026-07-15 | UAL46 | - | Jul 15, 00:20 UTC | Jul 15, 09:40 UTC | 9h 20m |
| 2026-07-14 | UAL160 | - | Jul 14, 10:55 UTC | Jul 14, 21:35 UTC | 10h 40m |
| 2026-07-13 | UAL194 | SFO → MUC | Jul 13, 21:36 UTC | Jul 14, 07:49 UTC | 10h 13m |
| 2026-07-13 | UAL194 | - | Jul 13, 21:40 UTC | Jul 14, 07:50 UTC | 10h 10m |
| 2026-07-13 | UAL34 | - | Jul 13, 08:05 UTC | Jul 13, 17:55 UTC | 9h 50m |
| 2026-07-12 | UAL35 | SFO → KIX | Jul 12, 18:35 UTC | Jul 13, 05:22 UTC | 10h 47m |
| 2026-07-12 | UAL35 | SFO → KIX | Jul 12, 18:40 UTC | Jul 13, 05:20 UTC | 10h 40m |
| 2026-07-11 | UAL889 | - | Jul 11, 03:30 UTC | Jul 11, 22:20 UTC | 18h 50m |
| 2026-07-10 | UAL888 | SFO → PEK | Jul 10, 18:15 UTC | Jul 11, 06:57 UTC | 12h 42m |
| 2026-07-10 | UAL888 | - | Jul 10, 18:15 UTC | Jul 11, 13:50 UTC | 19h 35m |
| 2026-07-09 | UAL673 | BCN → SFO | Jul 9, 14:31 UTC | Jul 10, 01:59 UTC | 11h 28m |
| 2026-07-09 | UAL673 | BCN → SFO | Jul 9, 14:31 UTC | Jul 10, 01:56 UTC | 11h 25m |
| 2026-07-09 | UAL673 | - | Jul 9, 14:30 UTC | Jul 9, 17:55 UTC | 3h 25m |
| 2026-07-09 | UAL672 | SFO → BCN | Jul 9, 01:30 UTC | Jul 9, 12:10 UTC | 10h 40m |
| 2026-07-08 | UAL45 | - | Jul 8, 12:10 UTC | Jul 8, 23:20 UTC | 11h 10m |
| 2026-07-07 | UAL44 | SFO → ZRH | Jul 7, 22:10 UTC | Jul 8, 08:35 UTC | 10h 25m |
| 2026-07-07 | UAL852 | - | Jul 7, 07:00 UTC | Jul 7, 18:25 UTC | 11h 25m |
| 2026-07-06 | UAL853 | SFO → TPE | Jul 6, 07:37 UTC | Jul 6, 20:11 UTC | 12h 34m |
| 2026-07-06 | UAL853 | SFO → TPE | Jul 6, 07:40 UTC | Jul 6, 20:15 UTC | 12h 35m |
| 2026-07-05 | UAL876 | HND → SFO | Jul 5, 08:30 UTC | Jul 5, 17:49 UTC | 9h 19m |
| 2026-07-05 | UAL876 | HND → SFO | Jul 5, 08:50 UTC | Jul 5, 17:50 UTC | 9h 0m |
| 2026-07-04 | UAL131 | - | Jul 4, 17:55 UTC | Jul 5, 06:25 UTC | 12h 30m |
| 2026-07-03 | UAL121 | BCN → EWR | Jul 3, 10:45 UTC | Jul 3, 18:30 UTC | 7h 45m |
| 2026-07-03 | UAL120 | - | Jul 3, 01:00 UTC | Jul 3, 08:15 UTC | 7h 15m |
| 2026-07-02 | UAL22 | DUB → EWR | Jul 2, 08:45 UTC | Jul 2, 15:25 UTC | 6h 40m |
| 2026-07-02 | UAL23 | EWR → DUB | Jul 2, 00:15 UTC | Jul 2, 05:55 UTC | 5h 40m |
| 2026-07-02 | UAL23 | EWR → DUB | Jul 2, 00:25 UTC | Jul 2, 06:15 UTC | 5h 50m |
| 2026-07-01 | UAL56 | CDG → EWR | Jul 1, 08:10 UTC | Jul 1, 15:40 UTC | 7h 30m |
| 2026-06-30 | UAL915 | IAD → CDG | Jun 30, 22:25 UTC | Jul 1, 05:30 UTC | 7h 5m |
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 N76010 page for operator, model, and routing details .