sensors Mode-S transponder
A2FF74
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N2921S · PIPER PA-32 · operated by AIRWORTHY SERVICES LLC
- Hex
- A2FF74
- Octal
- 50577564
- Decimal
- 10,682,228
- Country
- US
- Tail
- N2921S
- Type
- PA32
- Flights observed
- 52
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 48m ago
Last known position
Country allocation
The ICAO 24-bit address A2FF74 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 |
|---|---|---|---|
| N2921S | - | 52 | 2026-07-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | N2921S | - | Jul 14, 15:50 UTC | Jul 14, 16:35 UTC | 45m |
| 2026-07-09 | N2921S | SRQ → PPM | Jul 9, 16:30 UTC | Jul 9, 17:55 UTC | 1h 25m |
| 2026-07-02 | N2921S | - | Jul 2, 17:25 UTC | Jul 2, 18:40 UTC | 1h 15m |
| 2026-07-01 | N2921S | - | Jul 1, 22:30 UTC | Jul 1, 23:20 UTC | 50m |
| 2026-06-26 | N2921S | - | Jun 26, 17:19 UTC | Jun 26, 17:44 UTC | 25m |
| 2026-06-25 | N2921S | - | Jun 25, 13:40 UTC | Jun 25, 14:55 UTC | 1h 15m |
| 2026-06-24 | N2921S | - | Jun 24, 14:20 UTC | Jun 24, 15:54 UTC | 1h 35m |
| 2026-06-22 | N2921S | - | Jun 22, 15:35 UTC | Jun 22, 17:00 UTC | 1h 25m |
| 2026-06-21 | N2921S | - | Jun 21, 20:00 UTC | Jun 21, 21:39 UTC | 1h 40m |
| 2026-06-21 | N2921S | - | Jun 21, 14:40 UTC | Jun 21, 15:40 UTC | 1h 0m |
| 2026-06-20 | N2921S | - | Jun 20, 20:49 UTC | Jun 20, 21:30 UTC | 40m |
| 2026-06-18 | N2921S | - | Jun 18, 17:00 UTC | Jun 18, 17:25 UTC | 25m |
| 2026-06-18 | N2921S | - | Jun 18, 15:30 UTC | Jun 18, 16:20 UTC | 50m |
| 2026-06-17 | N2921S | TPA → PPM | Jun 17, 18:15 UTC | Jun 17, 19:50 UTC | 1h 35m |
| 2026-06-16 | N2921S | - | Jun 16, 17:30 UTC | Jun 16, 19:00 UTC | 1h 30m |
| 2026-06-15 | N2921S | - | Jun 15, 17:30 UTC | Jun 15, 18:40 UTC | 1h 10m |
| 2026-06-14 | N2921S | - | Jun 14, 12:15 UTC | Jun 14, 15:35 UTC | 3h 20m |
| 2026-06-11 | N2921S | - | Jun 11, 13:05 UTC | Jun 11, 16:20 UTC | 3h 15m |
| 2026-06-10 | N2921S | PPM → PPM | Jun 10, 00:25 UTC | Jun 10, 01:15 UTC | 50m |
| 2026-06-08 | N2921S | - | Jun 8, 18:35 UTC | Jun 8, 19:00 UTC | 25m |
| 2026-06-08 | N2921S | - | Jun 8, 16:35 UTC | Jun 8, 17:00 UTC | 25m |
| 2026-06-05 | N2921S | - | Jun 5, 17:10 UTC | Jun 5, 18:00 UTC | 50m |
| 2026-06-05 | N2921S | - | Jun 5, 14:45 UTC | Jun 5, 15:40 UTC | 55m |
| 2026-06-01 | N2921S | - | Jun 1, 19:00 UTC | Jun 1, 19:45 UTC | 45m |
| 2026-05-24 | N2921S | - | May 24, 23:40 UTC | May 24, 23:46 UTC | 6m |
| 2026-05-24 | N2921S | - | May 24, 16:25 UTC | May 24, 17:25 UTC | 1h 0m |
| 2026-05-22 | N2921S | - | May 22, 17:25 UTC | May 22, 18:15 UTC | 50m |
| 2026-05-20 | N2921S | PPM → PPM | May 20, 21:40 UTC | May 20, 22:15 UTC | 35m |
| 2026-05-18 | N2921S | - | May 18, 18:45 UTC | May 18, 19:45 UTC | 1h 0m |
| 2026-05-18 | N2921S | - | May 18, 15:20 UTC | May 18, 16:10 UTC | 50m |
| 2026-05-17 | N2921S | - | May 17, 17:55 UTC | May 17, 19:50 UTC | 1h 55m |
| 2026-05-16 | N2921S | - | May 16, 17:20 UTC | May 16, 19:00 UTC | 1h 40m |
| 2026-05-12 | N2921S | - | May 12, 15:50 UTC | May 12, 16:45 UTC | 55m |
| 2026-05-12 | N2921S | - | May 12, 13:55 UTC | May 12, 14:50 UTC | 55m |
| 2026-05-11 | N2921S | PPM → PPM | May 11, 14:25 UTC | May 11, 16:05 UTC | 1h 40m |
| 2026-05-07 | N2921S | PPM → PPM | May 7, 16:25 UTC | May 7, 17:10 UTC | 45m |
| 2026-05-03 | N2921S | - | May 3, 22:00 UTC | May 3, 22:45 UTC | 45m |
| 2026-05-01 | N2921S | - | May 1, 13:45 UTC | May 1, 14:00 UTC | 15m |
| 2026-04-29 | N2921S | - | Apr 29, 19:45 UTC | Apr 29, 20:20 UTC | 35m |
| 2026-04-29 | N2921S | - | Apr 29, 17:05 UTC | Apr 29, 17:40 UTC | 35m |
| 2026-04-28 | N2921S | - | Apr 28, 18:05 UTC | Apr 28, 18:55 UTC | 50m |
| 2026-04-28 | N2921S | - | Apr 28, 13:55 UTC | Apr 28, 14:55 UTC | 1h 0m |
| 2026-04-26 | N2921S | - | Apr 26, 19:20 UTC | Apr 26, 19:45 UTC | 25m |
| 2026-04-26 | N2921S | - | Apr 26, 14:35 UTC | Apr 26, 15:10 UTC | 35m |
| 2026-04-21 | N2921S | - | Apr 21, 21:00 UTC | Apr 21, 22:35 UTC | 1h 35m |
| 2026-04-21 | N2921S | - | Apr 21, 11:50 UTC | Apr 21, 13:10 UTC | 1h 20m |
| 2026-04-20 | N2921S | - | Apr 20, 15:45 UTC | Apr 20, 16:25 UTC | 40m |
| 2026-04-18 | N2921S | LEE → PPM | Apr 18, 20:35 UTC | Apr 18, 22:05 UTC | 1h 30m |
| 2026-04-18 | N2921S | - | Apr 18, 14:30 UTC | Apr 18, 15:50 UTC | 1h 20m |
| 2026-04-17 | N2921S | - | Apr 17, 18:05 UTC | Apr 17, 19:20 UTC | 1h 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 N2921S page for operator, model, and routing details .