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
- 110
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 37m ago
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 |
|---|---|---|---|
| UAL984 | United Airlines | 7 | 2026-05-17 |
| UAL506 | United Airlines | 7 | 2026-05-03 |
| UAL889 | United Airlines | 5 | 2026-05-28 |
| UAL888 | United Airlines | 5 | 2026-05-27 |
| UAL804 | United Airlines | 5 | 2026-05-21 |
| UAL58 | United Airlines | 5 | 2026-05-29 |
| UAL507 | United Airlines | 5 | 2026-05-03 |
| UAL918 | United Airlines | 4 | 2026-05-22 |
| UAL875 | United Airlines | 4 | 2026-05-20 |
| UAL673 | United Airlines | 4 | 2026-05-27 |
| UAL1726 | United Airlines | 4 | 2026-04-14 |
| UAL943 | United Airlines | 3 | 2026-04-22 |
| UAL57 | United Airlines | 3 | 2026-04-17 |
| UAL41 | United Airlines | 3 | 2026-04-15 |
| UAL40 | United Airlines | 3 | 2026-04-15 |
| UAL96 | United Airlines | 2 | 2026-05-19 |
| UAL942 | United Airlines | 2 | 2026-04-22 |
| UAL927 | United Airlines | 2 | 2026-05-10 |
| UAL919 | United Airlines | 2 | 2026-05-22 |
| UAL917 | United Airlines | 2 | 2026-04-24 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL58 | SFO → FRA | May 29, 21:15 UTC | May 30, 07:00 UTC | 9h 45m |
| 2026-05-28 | UAL889 | PEK → SFO | May 28, 10:45 UTC | May 28, 20:55 UTC | 10h 10m |
| 2026-05-27 | UAL888 | SFO → PEK | May 27, 18:25 UTC | May 28, 06:15 UTC | 11h 50m |
| 2026-05-27 | UAL673 | SFO → BOS | May 27, 00:00 UTC | May 27, 05:04 UTC | 5h 5m |
| 2026-05-26 | UAL673 | SFO → BOS | May 26, 14:35 UTC | May 26, 22:05 UTC | 7h 30m |
| 2026-05-26 | UAL672 | EWR → ATL | May 26, 01:24 UTC | May 26, 12:14 UTC | 10h 50m |
| 2026-05-25 | UAL1777 | EWR → IAH | May 25, 15:50 UTC | May 25, 21:04 UTC | 5h 15m |
| 2026-05-25 | UAL148 | GRU → EWR | May 25, 06:00 UTC | May 25, 09:15 UTC | 3h 15m |
| 2026-05-24 | UAL149 | EWR → GRU | May 24, 01:01 UTC | May 24, 10:02 UTC | 9h 1m |
| 2026-05-24 | UAL149 | EWR → GRU | May 24, 01:25 UTC | May 24, 03:00 UTC | 1h 35m |
| 2026-05-23 | UAL905 | LHR → EWR | May 23, 09:00 UTC | May 23, 16:05 UTC | 7h 5m |
| 2026-05-23 | UAL905 | LHR → EWR | May 23, 08:55 UTC | May 23, 16:01 UTC | 7h 6m |
| 2026-05-22 | UAL918 | IAD → LHR | May 22, 23:26 UTC | May 23, 05:38 UTC | 6h 12m |
| 2026-05-22 | UAL918 | IAD → LHR | May 22, 23:15 UTC | May 23, 05:00 UTC | 5h 44m |
| 2026-05-22 | UAL919 | LHR → IAD | May 22, 11:40 UTC | May 22, 19:00 UTC | 7h 20m |
| 2026-05-22 | UAL919 | LHR → IAD | May 22, 11:40 UTC | May 22, 18:53 UTC | 7h 13m |
| 2026-05-21 | UAL918 | IAD → LHR | May 21, 23:11 UTC | May 22, 05:49 UTC | 6h 38m |
| 2026-05-21 | UAL918 | IAD → LHR | May 21, 23:35 UTC | May 22, 05:55 UTC | 6h 20m |
| 2026-05-21 | UAL804 | HND → IAD | May 21, 07:15 UTC | May 21, 07:55 UTC | 40m |
| 2026-05-21 | UAL804 | HND → IAD | May 21, 07:15 UTC | May 21, 19:38 UTC | 12h 23m |
| 2026-05-20 | UAL875 | SFO → HND | May 20, 18:05 UTC | May 21, 05:04 UTC | 10h 59m |
| 2026-05-20 | UAL875 | SFO → HND | May 20, 18:15 UTC | May 20, 18:40 UTC | 25m |
| 2026-05-20 | UAL97 | BNE → SFO | May 20, 00:45 UTC | May 20, 12:50 UTC | 12h 6m |
| 2026-05-19 | UAL96 | SFO → BNE | May 19, 07:06 UTC | May 19, 20:16 UTC | 13h 10m |
| 2026-05-19 | UAL96 | SFO → BNE | May 19, 07:05 UTC | May 19, 20:20 UTC | 13h 15m |
| 2026-05-18 | UAL673 | SFO → BOS | May 18, 14:50 UTC | May 19, 02:25 UTC | 11h 34m |
| 2026-05-18 | UAL673 | SFO → BOS | May 18, 14:36 UTC | May 19, 02:20 UTC | 11h 44m |
| 2026-05-18 | UAL672 | EWR → ATL | May 18, 01:05 UTC | May 18, 11:45 UTC | 10h 40m |
| 2026-05-17 | UAL984 | CDG → SFO | May 17, 07:49 UTC | May 17, 17:51 UTC | 10h 2m |
| 2026-05-17 | UAL984 | CDG → SFO | May 17, 07:35 UTC | May 17, 17:01 UTC | 9h 26m |
| 2026-05-16 | UAL915 | IAD → CDG | May 16, 22:25 UTC | May 17, 05:20 UTC | 6h 55m |
| 2026-05-16 | UAL3933 | PWM → MCO | May 16, 15:50 UTC | May 16, 16:35 UTC | 45m |
| 2026-05-16 | UAL2480 | BOS → SFO | May 16, 03:15 UTC | May 16, 08:01 UTC | 4h 46m |
| 2026-05-15 | UAL2610 | IAD → PDX | May 15, 21:35 UTC | May 16, 01:30 UTC | 3h 55m |
| 2026-05-15 | UAL3918 | EWR → SFO | May 15, 16:15 UTC | May 15, 17:50 UTC | 1h 35m |
| 2026-05-12 | UAL804 | HND → IAD | May 12, 07:15 UTC | May 12, 19:15 UTC | 12h 0m |
| 2026-05-11 | UAL875 | SFO → HND | May 11, 18:00 UTC | May 12, 04:15 UTC | 10h 15m |
| 2026-05-10 | UAL927 | FRA → SFO | May 10, 16:20 UTC | May 11, 03:30 UTC | 11h 10m |
| 2026-05-10 | UAL926 | SFO → FRA | May 10, 02:34 UTC | May 10, 13:05 UTC | 10h 30m |
| 2026-05-09 | UAL969 | AMS → SFO | May 9, 13:45 UTC | May 10, 00:09 UTC | 10h 25m |
| 2026-05-08 | UAL968 | SFO → AMS | May 8, 22:35 UTC | May 9, 08:25 UTC | 9h 50m |
| 2026-05-08 | UAL876 | HND → SFO | May 8, 07:15 UTC | May 8, 16:00 UTC | 8h 45m |
| 2026-05-08 | UAL876 | HND → SFO | May 8, 07:09 UTC | May 8, 16:00 UTC | 8h 50m |
| 2026-05-07 | UAL131 | EWR → HND | May 7, 14:40 UTC | May 8, 04:29 UTC | 13h 49m |
| 2026-05-07 | UAL2397 | EWR → PDX | May 7, 04:15 UTC | May 7, 08:25 UTC | 4h 10m |
| 2026-05-06 | UAL2238 | IAH → SFO | May 6, 20:05 UTC | May 7, 01:20 UTC | 5h 15m |
| 2026-05-06 | UAL2397 | EWR → PDX | May 6, 06:00 UTC | May 6, 10:10 UTC | 4h 10m |
| 2026-05-05 | UAL2238 | IAH → SFO | May 5, 22:50 UTC | May 6, 04:20 UTC | 5h 30m |
| 2026-05-05 | UAL435 | KOA → SFO | May 5, 16:10 UTC | May 5, 20:45 UTC | 4h 35m |
| 2026-05-03 | UAL506 | MSN → DEN | May 3, 14:30 UTC | May 3, 17:10 UTC | 2h 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 N76010 page for operator, model, and routing details .