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
- 86
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2h ago
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 |
|---|---|---|---|
| UAL821 | United Airlines | 6 | 2026-05-28 |
| UAL153 | United Airlines | 6 | 2026-05-21 |
| UAL152 | United Airlines | 6 | 2026-05-20 |
| UAL83 | United Airlines | 5 | 2026-05-25 |
| UAL820 | United Airlines | 5 | 2026-05-28 |
| UAL82 | United Airlines | 5 | 2026-05-24 |
| UAL1227 | United Airlines | 5 | 2026-05-14 |
| UAL923 | United Airlines | 4 | 2026-05-21 |
| UAL61 | United Airlines | 3 | 2026-05-16 |
| UAL98 | United Airlines | 2 | 2026-05-07 |
| UAL935 | United Airlines | 2 | 2026-05-22 |
| UAL863 | United Airlines | 2 | 2026-04-29 |
| UAL805 | United Airlines | 2 | 2026-04-27 |
| UAL60 | United Airlines | 2 | 2026-05-15 |
| UAL32 | United Airlines | 2 | 2026-05-29 |
| UAL3019 | - | 2 | 2026-04-13 |
| UAL28 | United Airlines | 2 | 2026-04-26 |
| UAL2692 | United Airlines | 2 | 2026-05-04 |
| UAL199 | United Airlines | 2 | 2026-05-09 |
| UAL123 | United Airlines | 2 | 2026-05-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL32 | LAX → NRT | May 29, 18:20 UTC | May 30, 05:25 UTC | 11h 5m |
| 2026-05-29 | UAL32 | LAX → NRT | May 29, 18:15 UTC | May 30, 05:21 UTC | 11h 6m |
| 2026-05-28 | UAL821 | SFO → MEX | May 28, 14:05 UTC | May 29, 02:50 UTC | 12h 45m |
| 2026-05-28 | UAL821 | SFO → MEX | May 28, 11:05 UTC | May 28, 11:25 UTC | 20m |
| 2026-05-28 | UAL821 | SFO → MEX | May 28, 09:00 UTC | May 28, 10:20 UTC | 1h 20m |
| 2026-05-28 | UAL820 | MEX → SFO | May 28, 00:20 UTC | May 28, 02:25 UTC | 2h 5m |
| 2026-05-27 | UAL820 | MEX → SFO | May 27, 07:30 UTC | May 27, 21:40 UTC | 14h 10m |
| 2026-05-26 | UAL353 | SAN → EWR | May 26, 23:10 UTC | May 27, 04:04 UTC | 4h 55m |
| 2026-05-25 | UAL83 | DEL → EWR | May 25, 18:50 UTC | May 26, 10:39 UTC | 15h 49m |
| 2026-05-24 | UAL82 | EWR → DEL | May 24, 19:50 UTC | May 25, 15:25 UTC | 19h 35m |
| 2026-05-24 | UAL82 | EWR → DEL | May 24, 17:50 UTC | May 25, 15:25 UTC | 21h 35m |
| 2026-05-24 | UAL114 | PPT → SFO | May 24, 07:30 UTC | May 24, 14:55 UTC | 7h 25m |
| 2026-05-23 | UAL115 | SFO → PPT | May 23, 21:00 UTC | May 24, 05:30 UTC | 8h 30m |
| 2026-05-23 | UAL1593 | LGA → DEN | May 23, 13:50 UTC | May 23, 19:00 UTC | 5h 11m |
| 2026-05-23 | UAL2303 | IAD → SAN | May 23, 06:35 UTC | May 23, 11:10 UTC | 4h 35m |
| 2026-05-22 | UAL935 | LHR → LAX | May 22, 13:05 UTC | May 22, 23:05 UTC | 10h 0m |
| 2026-05-21 | UAL923 | LAX → LHR | May 21, 23:00 UTC | May 22, 02:20 UTC | 3h 20m |
| 2026-05-21 | UAL923 | LAX → LHR | May 21, 23:01 UTC | May 22, 09:08 UTC | 10h 7m |
| 2026-05-21 | UAL153 | HKG → LAX | May 21, 05:08 UTC | May 21, 17:46 UTC | 12h 38m |
| 2026-05-21 | UAL153 | HKG → LAX | May 21, 05:00 UTC | May 21, 17:50 UTC | 12h 50m |
| 2026-05-21 | UAL153 | HKG → LAX | May 21, 02:10 UTC | May 21, 02:30 UTC | 20m |
| 2026-05-20 | UAL152 | LAX → HKG | May 20, 12:55 UTC | May 20, 13:10 UTC | 15m |
| 2026-05-19 | UAL152 | LAX → HKG | May 19, 20:00 UTC | May 20, 10:35 UTC | 14h 36m |
| 2026-05-18 | UAL2679 | DEN → ORD | May 18, 14:45 UTC | May 18, 19:55 UTC | 5h 9m |
| 2026-05-17 | UAL83 | DEL → EWR | May 17, 20:35 UTC | May 18, 03:45 UTC | 7h 10m |
| 2026-05-17 | UAL83 | DEL → EWR | May 17, 20:27 UTC | May 18, 11:48 UTC | 15h 21m |
| 2026-05-17 | UAL83 | DEL → EWR | May 17, 20:27 UTC | May 18, 11:41 UTC | 15h 14m |
| 2026-05-17 | UAL82 | EWR → DEL | May 17, 01:10 UTC | May 17, 15:20 UTC | 14h 10m |
| 2026-05-16 | UAL713 | ORD → DEL | May 16, 18:05 UTC | May 16, 23:05 UTC | 5h 0m |
| 2026-05-16 | UAL61 | BRU → EWR | May 16, 01:15 UTC | May 16, 01:45 UTC | 30m |
| 2026-05-16 | UAL61 | BRU → EWR | May 16, 01:19 UTC | May 16, 14:51 UTC | 13h 32m |
| 2026-05-16 | UAL61 | BRU → EWR | May 16, 01:19 UTC | May 16, 14:40 UTC | 13h 21m |
| 2026-05-15 | UAL60 | SFO → MEL | May 15, 21:45 UTC | May 15, 22:20 UTC | 35m |
| 2026-05-15 | UAL60 | SFO → MEL | May 15, 07:15 UTC | May 15, 21:40 UTC | 14h 24m |
| 2026-05-14 | UAL1227 | PHX → IAD | May 14, 17:55 UTC | May 14, 23:15 UTC | 5h 20m |
| 2026-05-14 | UAL1227 | PHX → IAD | May 14, 17:52 UTC | May 14, 23:11 UTC | 5h 19m |
| 2026-05-14 | UAL123 | ANC → ORD | May 14, 07:00 UTC | May 14, 14:10 UTC | 7h 10m |
| 2026-05-14 | UAL123 | ANC → ORD | May 14, 07:02 UTC | May 14, 14:14 UTC | 7h 12m |
| 2026-05-13 | UAL122 | IAD → LHR | May 13, 14:00 UTC | May 13, 20:30 UTC | 6h 30m |
| 2026-05-12 | UAL1855 | ORD → BOS | May 12, 20:30 UTC | May 13, 01:10 UTC | 4h 40m |
| 2026-05-12 | UAL153 | HKG → LAX | May 12, 05:45 UTC | May 12, 17:35 UTC | 11h 50m |
| 2026-05-12 | UAL153 | HKG → LAX | May 12, 05:08 UTC | May 12, 17:20 UTC | 12h 12m |
| 2026-05-12 | UAL153 | HKG → LAX | May 12, 05:00 UTC | May 12, 05:15 UTC | 15m |
| 2026-05-11 | UAL152 | LAX → HKG | May 11, 13:00 UTC | May 11, 13:10 UTC | 10m |
| 2026-05-11 | UAL152 | LAX → HKG | May 11, 09:30 UTC | May 11, 09:50 UTC | 20m |
| 2026-05-10 | UAL152 | LAX → HKG | May 10, 19:15 UTC | May 11, 08:55 UTC | 13h 40m |
| 2026-05-10 | UAL152 | LAX → HKG | May 10, 19:17 UTC | May 11, 09:49 UTC | 14h 32m |
| 2026-05-09 | UAL199 | PVG → LAX | May 9, 06:30 UTC | May 9, 23:25 UTC | 16h 55m |
| 2026-05-09 | UAL199 | PVG → LAX | May 9, 00:30 UTC | May 9, 23:25 UTC | 22h 55m |
| 2026-05-08 | UAL198 | LAX → PVG | May 8, 20:05 UTC | May 9, 14:30 UTC | 18h 25m |
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 .