sensors Mode-S transponder
A0C945
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N15QS · CESSNA 560XL Citation XLS
- Hex
- A0C945
- Octal
- 50144505
- Decimal
- 10,537,285
- Country
- US
- Tail
- N15QS
- Type
- C56X
- Flights observed
- 59
- Distinct callsigns
- 11
- Country
- US
- Last broadcast
- 14d ago
Last known position
Country allocation
The ICAO 24-bit address A0C945 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 11 distinct
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-23 | EJA15 | ICT → ADS | Jul 23, 23:00 UTC | Jul 23, 23:55 UTC | 55m |
| 2026-07-23 | EJA15 | ICT → ADS | Jul 23, 18:45 UTC | Jul 23, 19:20 UTC | 35m |
| 2026-07-23 | EJA15 | ICT → ADS | Jul 23, 00:35 UTC | Jul 23, 17:45 UTC | 17h 10m |
| 2026-07-22 | EJA15 | ICT → ADS | Jul 22, 22:40 UTC | Jul 22, 23:50 UTC | 1h 10m |
| 2026-07-22 | EJA15 | ICT → ADS | Jul 22, 19:50 UTC | Jul 22, 20:55 UTC | 1h 5m |
| 2026-07-22 | EJA15 | ICT → ADS | Jul 22, 17:00 UTC | Jul 22, 18:30 UTC | 1h 30m |
| 2026-07-21 | EJA15 | ICT → ADS | Jul 21, 23:45 UTC | Jul 22, 00:35 UTC | 50m |
| 2026-07-21 | EJA15 | ICT → ADS | Jul 21, 20:50 UTC | Jul 21, 22:25 UTC | 1h 35m |
| 2026-07-21 | EJA15 | ICT → ADS | Jul 21, 18:50 UTC | Jul 21, 19:00 UTC | 10m |
| 2026-07-20 | EJA15 | ICT → ADS | Jul 20, 22:30 UTC | Jul 21, 01:15 UTC | 2h 45m |
| 2026-07-20 | EJA15 | ICT → ADS | Jul 20, 19:45 UTC | Jul 20, 20:45 UTC | 1h 0m |
| 2026-07-20 | EJA15 | - | Jul 20, 16:30 UTC | Jul 20, 18:50 UTC | 2h 20m |
| 2026-07-20 | EJA15 | - | Jul 20, 00:35 UTC | Jul 20, 02:35 UTC | 2h 0m |
| 2026-07-19 | EJA15 | - | Jul 19, 22:20 UTC | Jul 19, 23:05 UTC | 45m |
| 2026-07-19 | EJA15 | - | Jul 19, 18:45 UTC | Jul 19, 21:00 UTC | 2h 15m |
| 2026-07-19 | EJA15 | - | Jul 19, 15:10 UTC | Jul 19, 15:30 UTC | 20m |
| 2026-07-18 | EJA15 | SBA → COE | Jul 18, 21:10 UTC | Jul 18, 23:05 UTC | 1h 55m |
| 2026-07-18 | EJA15 | COE → SBA | Jul 18, 17:20 UTC | Jul 18, 19:50 UTC | 2h 30m |
| 2026-07-18 | EJA15 | - | Jul 18, 15:05 UTC | Jul 18, 16:20 UTC | 1h 15m |
| 2026-07-17 | EJA15 | - | Jul 17, 18:44 UTC | Jul 17, 19:45 UTC | 1h 0m |
| 2026-07-14 | EJA15 | SJC → SNA | Jul 14, 16:00 UTC | Jul 14, 17:00 UTC | 1h 0m |
| 2026-07-14 | EJA15 | - | Jul 14, 00:50 UTC | Jul 14, 02:50 UTC | 2h 0m |
| 2026-07-13 | EJA15 | - | Jul 13, 01:50 UTC | Jul 13, 03:15 UTC | 1h 25m |
| 2026-07-12 | EJA15 | - | Jul 12, 20:25 UTC | Jul 12, 21:30 UTC | 1h 5m |
| 2026-07-12 | EJA15 | - | Jul 12, 16:01 UTC | Jul 12, 18:40 UTC | 2h 40m |
| 2026-07-11 | EJA15 | - | Jul 11, 21:35 UTC | Jul 12, 00:50 UTC | 3h 15m |
| 2026-07-11 | EJA15 | - | Jul 11, 18:45 UTC | Jul 11, 20:15 UTC | 1h 30m |
| 2026-07-11 | EJA15 | - | Jul 11, 15:45 UTC | Jul 11, 16:55 UTC | 1h 10m |
| 2026-07-11 | EJA15 | - | Jul 11, 13:15 UTC | Jul 11, 14:55 UTC | 1h 40m |
| 2026-07-10 | EJA15 | - | Jul 10, 19:15 UTC | Jul 10, 22:15 UTC | 3h 1m |
| 2026-07-10 | EJA15 | - | Jul 10, 17:00 UTC | Jul 10, 18:30 UTC | 1h 30m |
| 2026-07-10 | EJA15 | - | Jul 10, 14:45 UTC | Jul 10, 15:35 UTC | 50m |
| 2026-07-09 | EJA15 | - | Jul 9, 22:55 UTC | Jul 10, 02:00 UTC | 3h 5m |
| 2026-07-09 | EJA15 | - | Jul 9, 17:35 UTC | Jul 9, 18:00 UTC | 25m |
| 2026-07-09 | EJA15 | - | Jul 9, 16:25 UTC | Jul 9, 16:40 UTC | 15m |
| 2026-07-09 | EJA15 | TEB → BDR | Jul 9, 15:05 UTC | Jul 9, 15:30 UTC | 25m |
| 2026-07-07 | EJA15 | - | Jul 7, 22:40 UTC | Jul 7, 23:35 UTC | 55m |
| 2026-07-07 | EJA15 | - | Jul 7, 19:40 UTC | Jul 7, 20:25 UTC | 45m |
| 2026-07-07 | EJA15 | - | Jul 7, 15:50 UTC | Jul 7, 16:15 UTC | 25m |
| 2026-07-07 | EJA15 | - | Jul 7, 14:15 UTC | Jul 7, 14:40 UTC | 25m |
| 2026-07-07 | EJA15 | - | Jul 7, 12:10 UTC | Jul 7, 12:30 UTC | 20m |
| 2026-07-06 | EJA15 | - | Jul 6, 20:20 UTC | Jul 6, 22:35 UTC | 2h 15m |
| 2026-07-06 | EJA15 | - | Jul 6, 17:05 UTC | Jul 6, 19:15 UTC | 2h 10m |
| 2026-07-06 | EJA15 | - | Jul 6, 13:30 UTC | Jul 6, 15:20 UTC | 1h 50m |
| 2026-06-26 | EJA15 | - | Jun 26, 21:15 UTC | Jun 26, 22:14 UTC | 1h 0m |
| 2026-06-16 | CITT39 | - | Jun 16, 18:35 UTC | Jun 16, 19:35 UTC | 1h 0m |
| 2026-06-15 | N15QS | - | Jun 15, 13:45 UTC | Jun 15, 16:19 UTC | 2h 35m |
| 2026-06-04 | CITT39 | - | Jun 4, 20:35 UTC | Jun 4, 22:15 UTC | 1h 40m |
| 2026-05-30 | CITT40 | - | May 30, 20:10 UTC | May 30, 20:25 UTC | 15m |
| 2026-05-26 | CITT39 | - | May 26, 18:45 UTC | May 26, 19:30 UTC | 45m |
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 N15QS page for operator, model, and routing details .