sensors Mode-S transponder
AD4BA3
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N956HC · CESSNA 525B Citation CJ3 · operated by HC VENTURES LLC
- Hex
- AD4BA3
- Octal
- 53245643
- Decimal
- 11,357,091
- Country
- US
- Tail
- N956HC
- Type
- C25B
- Flights observed
- 54
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 26, 22:15 UTC
Last known position
Country allocation
The ICAO 24-bit address AD4BA3 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| N956HC | - | 54 | 2026-07-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | N956HC | - | Jul 26, 21:05 UTC | Jul 26, 22:15 UTC | 1h 10m |
| 2026-07-26 | N956HC | - | Jul 26, 19:10 UTC | Jul 26, 20:10 UTC | 1h 0m |
| 2026-07-23 | N956HC | - | Jul 23, 18:00 UTC | Jul 23, 20:00 UTC | 2h 0m |
| 2026-07-22 | N956HC | - | Jul 22, 13:55 UTC | Jul 22, 15:35 UTC | 1h 40m |
| 2026-07-21 | N956HC | - | Jul 21, 18:30 UTC | Jul 21, 21:00 UTC | 2h 30m |
| 2026-07-21 | N956HC | - | Jul 21, 15:25 UTC | Jul 21, 17:30 UTC | 2h 5m |
| 2026-07-17 | N956HC | - | Jul 17, 15:40 UTC | Jul 17, 18:44 UTC | 3h 5m |
| 2026-07-16 | N956HC | - | Jul 16, 19:10 UTC | Jul 16, 19:55 UTC | 45m |
| 2026-07-15 | N956HC | - | Jul 15, 16:30 UTC | Jul 15, 17:25 UTC | 55m |
| 2026-07-09 | N956HC | - | Jul 9, 01:10 UTC | Jul 9, 01:25 UTC | 15m |
| 2026-07-08 | N956HC | - | Jul 8, 22:40 UTC | Jul 9, 00:25 UTC | 1h 45m |
| 2026-07-05 | N956HC | - | Jul 5, 21:40 UTC | Jul 5, 22:50 UTC | 1h 10m |
| 2026-07-05 | N956HC | - | Jul 5, 20:30 UTC | Jul 5, 20:55 UTC | 25m |
| 2026-06-28 | N956HC | - | Jun 28, 18:25 UTC | Jun 28, 18:44 UTC | 20m |
| 2026-06-28 | N956HC | - | Jun 28, 17:19 UTC | Jun 28, 17:44 UTC | 25m |
| 2026-06-24 | N956HC | - | Jun 24, 21:44 UTC | Jun 24, 22:10 UTC | 25m |
| 2026-06-23 | N956HC | - | Jun 23, 19:04 UTC | Jun 24, 14:04 UTC | 19h 0m |
| 2026-06-23 | N956HC | - | Jun 23, 13:45 UTC | Jun 23, 14:39 UTC | 55m |
| 2026-06-21 | N956HC | - | Jun 21, 22:00 UTC | Jun 21, 23:30 UTC | 1h 30m |
| 2026-06-18 | N956HC | - | Jun 18, 21:00 UTC | Jun 18, 23:00 UTC | 2h 0m |
| 2026-06-17 | N956HC | - | Jun 17, 21:05 UTC | Jun 17, 21:15 UTC | 10m |
| 2026-06-08 | N956HC | - | Jun 8, 21:45 UTC | Jun 8, 22:15 UTC | 30m |
| 2026-06-08 | N956HC | - | Jun 8, 18:00 UTC | Jun 8, 18:20 UTC | 20m |
| 2026-06-08 | N956HC | - | Jun 8, 14:20 UTC | Jun 8, 15:04 UTC | 45m |
| 2026-06-07 | N956HC | - | Jun 7, 17:25 UTC | Jun 7, 19:40 UTC | 2h 15m |
| 2026-06-04 | N956HC | - | Jun 4, 18:40 UTC | Jun 4, 20:50 UTC | 2h 10m |
| 2026-05-31 | N956HC | - | May 31, 20:35 UTC | May 31, 22:10 UTC | 1h 35m |
| 2026-05-31 | N956HC | - | May 31, 16:55 UTC | May 31, 18:55 UTC | 2h 0m |
| 2026-05-23 | N956HC | - | May 23, 19:10 UTC | May 23, 20:55 UTC | 1h 45m |
| 2026-05-23 | N956HC | - | May 23, 16:30 UTC | May 23, 18:20 UTC | 1h 51m |
| 2026-05-18 | N956HC | - | May 18, 17:50 UTC | May 18, 18:15 UTC | 25m |
| 2026-05-18 | N956HC | - | May 18, 16:25 UTC | May 18, 17:20 UTC | 55m |
| 2026-05-17 | N956HC | - | May 17, 18:50 UTC | May 18, 17:20 UTC | 22h 30m |
| 2026-05-17 | N956HC | - | May 17, 18:01 UTC | May 18, 16:45 UTC | 22h 45m |
| 2026-05-17 | N956HC | - | May 17, 14:01 UTC | May 17, 16:25 UTC | 2h 25m |
| 2026-05-12 | N956HC | - | May 12, 23:50 UTC | May 13, 01:45 UTC | 1h 55m |
| 2026-05-12 | N956HC | - | May 12, 21:15 UTC | May 12, 23:05 UTC | 1h 50m |
| 2026-05-12 | N956HC | - | May 12, 20:10 UTC | May 12, 20:40 UTC | 30m |
| 2026-05-05 | N956HC | - | May 5, 22:55 UTC | May 6, 02:15 UTC | 3h 20m |
| 2026-05-04 | N956HC | - | May 4, 16:30 UTC | May 4, 18:55 UTC | 2h 26m |
| 2026-05-03 | N956HC | - | May 3, 20:55 UTC | May 4, 18:55 UTC | 22h 1m |
| 2026-05-03 | N956HC | - | May 3, 20:25 UTC | May 4, 18:45 UTC | 22h 21m |
| 2026-05-01 | N956HC | - | May 1, 15:15 UTC | May 1, 17:10 UTC | 1h 55m |
| 2026-04-30 | N956HC | - | Apr 30, 15:10 UTC | Apr 30, 16:45 UTC | 1h 35m |
| 2026-04-27 | N956HC | - | Apr 27, 21:35 UTC | Apr 27, 23:45 UTC | 2h 10m |
| 2026-04-26 | N956HC | - | Apr 26, 21:10 UTC | Apr 26, 21:45 UTC | 35m |
| 2026-04-26 | N956HC | - | Apr 26, 11:40 UTC | Apr 26, 11:55 UTC | 15m |
| 2026-04-24 | N956HC | - | Apr 24, 12:15 UTC | Apr 24, 15:05 UTC | 2h 50m |
| 2026-04-22 | N956HC | - | Apr 22, 13:25 UTC | Apr 22, 16:05 UTC | 2h 40m |
| 2026-04-17 | N956HC | - | Apr 17, 17:30 UTC | Apr 17, 19:05 UTC | 1h 35m |
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 N956HC page for operator, model, and routing details .