sensors Mode-S transponder
A4095F
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N35953 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A4095F
- Octal
- 51004537
- Decimal
- 10,750,303
- Country
- US
- Tail
- N35953
- Type
- B789
- Flights observed
- 208
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 13:15 UTC
Current position
Country allocation
The ICAO 24-bit address A4095F 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 |
|---|---|---|---|
| UAL142 | - | 13 | 2026-07-16 |
| UAL182 | United Airlines | 11 | 2026-07-07 |
| UAL181 | - | 11 | 2026-07-08 |
| UAL152 | United Airlines | 11 | 2026-07-26 |
| UAL27 | - | 10 | 2026-07-09 |
| UAL178 | - | 10 | 2026-07-17 |
| UAL153 | United Airlines | 9 | 2026-07-23 |
| UAL820 | United Airlines | 8 | 2026-07-25 |
| UAL26 | - | 8 | 2026-07-09 |
| UAL177 | - | 7 | 2026-07-17 |
| UAL143 | - | 7 | 2026-07-20 |
| UAL821 | United Airlines | 6 | 2026-05-28 |
| UAL761 | - | 6 | 2026-07-19 |
| UAL760 | - | 6 | 2026-07-19 |
| UAL83 | United Airlines | 5 | 2026-05-25 |
| UAL82 | United Airlines | 5 | 2026-05-24 |
| UAL1227 | United Airlines | 5 | 2026-05-14 |
| UAL923 | United Airlines | 4 | 2026-05-21 |
| UAL63 | - | 4 | 2026-07-15 |
| UAL62 | - | 3 | 2026-07-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL152 | LAX → HKG | Jul 26, 13:05 UTC | Jul 26, 13:15 UTC | 10m |
| 2026-07-25 | UAL820 | MEX → SFO | Jul 25, 21:05 UTC | Jul 25, 21:15 UTC | 10m |
| 2026-07-25 | UAL820 | MEX → SFO | Jul 25, 07:15 UTC | Jul 25, 17:40 UTC | 10h 25m |
| 2026-07-25 | UAL820 | MEX → SFO | Jul 25, 07:14 UTC | Jul 25, 21:06 UTC | 13h 52m |
| 2026-07-24 | UAL199 | PVG → LAX | Jul 24, 12:31 UTC | Jul 25, 00:20 UTC | 11h 49m |
| 2026-07-23 | UAL198 | LAX → PVG | Jul 23, 21:20 UTC | Jul 24, 14:55 UTC | 17h 35m |
| 2026-07-23 | UAL153 | HKG → LAX | Jul 23, 05:08 UTC | Jul 23, 18:25 UTC | 13h 17m |
| 2026-07-23 | UAL153 | HKG → LAX | Jul 23, 05:15 UTC | Jul 23, 18:30 UTC | 13h 15m |
| 2026-07-23 | UAL153 | HKG → LAX | Jul 23, 01:55 UTC | Jul 23, 02:20 UTC | 25m |
| 2026-07-22 | UAL152 | - | Jul 22, 13:00 UTC | Jul 22, 13:15 UTC | 15m |
| 2026-07-22 | UAL152 | HKG → SGN | Jul 22, 12:49 UTC | Jul 22, 15:07 UTC | 2h 18m |
| 2026-07-21 | UAL152 | - | Jul 21, 20:55 UTC | Jul 21, 21:55 UTC | 1h 0m |
| 2026-07-21 | UAL152 | LAX → HKG | Jul 21, 20:43 UTC | Jul 22, 10:27 UTC | 13h 44m |
| 2026-07-21 | UAL33 | NRT → LAX | Jul 21, 08:05 UTC | Jul 21, 08:35 UTC | 30m |
| 2026-07-21 | UAL33 | NRT → LAX | Jul 21, 08:05 UTC | Jul 21, 17:52 UTC | 9h 47m |
| 2026-07-21 | UAL33 | NRT → LAX | Jul 21, 08:05 UTC | Jul 21, 18:05 UTC | 10h 0m |
| 2026-07-20 | UAL143 | - | Jul 20, 18:10 UTC | Jul 21, 05:35 UTC | 11h 24m |
| 2026-07-19 | UAL761 | - | Jul 19, 14:40 UTC | Jul 20, 00:35 UTC | 9h 55m |
| 2026-07-19 | UAL760 | DEN → MUC | Jul 19, 02:45 UTC | Jul 19, 12:10 UTC | 9h 25m |
| 2026-07-18 | UAL263 | - | Jul 18, 14:25 UTC | Jul 18, 23:10 UTC | 8h 45m |
| 2026-07-18 | UAL262 | DEN → LHR | Jul 18, 02:55 UTC | Jul 18, 11:30 UTC | 8h 35m |
| 2026-07-17 | UAL178 | - | Jul 17, 13:10 UTC | Jul 17, 13:45 UTC | 35m |
| 2026-07-17 | UAL178 | FCO → DEN | Jul 17, 12:47 UTC | Jul 17, 23:35 UTC | 10h 48m |
| 2026-07-17 | UAL177 | DEN → FCO | Jul 17, 00:40 UTC | Jul 17, 10:50 UTC | 10h 10m |
| 2026-07-16 | UAL142 | - | Jul 16, 07:55 UTC | Jul 16, 08:25 UTC | 30m |
| 2026-07-16 | UAL142 | NRT → DEN | Jul 16, 07:50 UTC | Jul 16, 18:20 UTC | 10h 30m |
| 2026-07-16 | UAL142 | NRT → DEN | Jul 16, 07:50 UTC | Jul 16, 18:16 UTC | 10h 26m |
| 2026-07-15 | UAL7 | - | Jul 15, 16:05 UTC | Jul 16, 04:40 UTC | 12h 35m |
| 2026-07-15 | UAL63 | GRU → IAH | Jul 15, 01:11 UTC | Jul 15, 10:41 UTC | 9h 30m |
| 2026-07-15 | UAL63 | - | Jul 15, 01:10 UTC | Jul 15, 10:40 UTC | 9h 30m |
| 2026-07-14 | UAL62 | - | Jul 14, 00:20 UTC | Jul 14, 09:35 UTC | 9h 15m |
| 2026-07-13 | UAL6 | - | Jul 13, 08:25 UTC | Jul 13, 20:10 UTC | 11h 45m |
| 2026-07-12 | UAL143 | - | Jul 12, 18:05 UTC | Jul 13, 05:05 UTC | 11h 0m |
| 2026-07-11 | UAL178 | IAD → DEN | Jul 11, 04:25 UTC | Jul 11, 07:40 UTC | 3h 15m |
| 2026-07-10 | UAL178 | - | Jul 10, 16:10 UTC | Jul 11, 01:05 UTC | 8h 55m |
| 2026-07-10 | UAL177 | DEN → FCO | Jul 10, 00:00 UTC | Jul 10, 10:10 UTC | 10h 10m |
| 2026-07-09 | UAL26 | LHR → DEN | Jul 9, 11:10 UTC | Jul 9, 20:00 UTC | 8h 50m |
| 2026-07-09 | UAL27 | DEN → LHR | Jul 9, 00:25 UTC | Jul 9, 09:00 UTC | 8h 35m |
| 2026-07-08 | UAL181 | FRA → DEN | Jul 8, 09:50 UTC | Jul 8, 19:25 UTC | 9h 35m |
| 2026-07-07 | UAL182 | DEN → FRA | Jul 7, 22:18 UTC | Jul 8, 06:57 UTC | 8h 39m |
| 2026-07-07 | UAL182 | DEN → FRA | Jul 7, 22:15 UTC | Jul 8, 07:10 UTC | 8h 55m |
| 2026-07-07 | UAL142 | NRT → DEN | Jul 7, 07:50 UTC | Jul 7, 17:45 UTC | 9h 55m |
| 2026-07-06 | UAL143 | DEN → NRT | Jul 6, 18:20 UTC | Jul 7, 05:15 UTC | 10h 55m |
| 2026-07-05 | UAL142 | NRT → DEN | Jul 5, 10:15 UTC | Jul 5, 20:00 UTC | 9h 45m |
| 2026-07-05 | UAL142 | NRT → DEN | Jul 5, 09:50 UTC | Jul 5, 19:58 UTC | 10h 8m |
| 2026-07-04 | UAL143 | DEN → NRT | Jul 4, 18:00 UTC | Jul 5, 05:05 UTC | 11h 5m |
| 2026-07-03 | UAL761 | MUC → DEN | Jul 3, 14:25 UTC | Jul 4, 00:35 UTC | 10h 10m |
| 2026-07-03 | UAL760 | DEN → MUC | Jul 3, 03:00 UTC | Jul 3, 11:52 UTC | 8h 52m |
| 2026-07-03 | UAL760 | - | Jul 3, 03:10 UTC | Jul 3, 04:55 UTC | 1h 45m |
| 2026-07-02 | UAL263 | - | Jul 2, 14:10 UTC | Jul 2, 23:25 UTC | 9h 15m |
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 N35953 page for operator, model, and routing details .