sensors Mode-S transponder
50021D
ICAO 24-bit transponder address · allocated to San Marino
Currently assigned to T7-FEE · GULFSTREAM 4
- Hex
- 50021D
- Octal
- 24001035
- Decimal
- 5,243,421
- Country
- SM
- Tail
- T7-FEE
- Type
- GLF4
- Flights observed
- 37
- Distinct callsigns
- 1
- Country
- SM
- Last broadcast
- 20h ago
Last known position
Country allocation
The ICAO 24-bit address 50021D falls within the block assigned to San Marino (SM) by ICAO Annex 10, Volume III. Every aircraft registered in San Marino 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 |
|---|---|---|---|
| T7FEE | - | 37 | 2026-06-06 |
Recent flights last 37
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-06 | T7FEE | - | Jun 6, 13:49 UTC | Jun 6, 16:14 UTC | 2h 25m |
| 2026-06-04 | T7FEE | - | Jun 4, 15:50 UTC | Jun 4, 16:20 UTC | 30m |
| 2026-06-03 | T7FEE | - | Jun 3, 16:25 UTC | Jun 3, 16:55 UTC | 30m |
| 2026-06-02 | T7FEE | - | Jun 2, 06:40 UTC | Jun 2, 11:10 UTC | 4h 30m |
| 2026-05-31 | T7FEE | - | May 31, 08:25 UTC | May 31, 10:20 UTC | 1h 55m |
| 2026-05-29 | T7FEE | - | May 29, 09:15 UTC | May 29, 09:50 UTC | 35m |
| 2026-05-28 | T7FEE | BOS → BUD | May 28, 22:50 UTC | May 29, 06:40 UTC | 7h 50m |
| 2026-05-27 | T7FEE | - | May 27, 23:50 UTC | May 28, 00:35 UTC | 45m |
| 2026-05-27 | T7FEE | SFO → TEB | May 27, 02:49 UTC | May 27, 07:50 UTC | 5h 1m |
| 2026-05-24 | T7FEE | - | May 24, 23:00 UTC | May 25, 04:10 UTC | 5h 10m |
| 2026-05-23 | T7FEE | - | May 23, 18:45 UTC | May 24, 04:05 UTC | 9h 20m |
| 2026-05-23 | T7FEE | - | May 23, 15:35 UTC | May 23, 16:35 UTC | 1h 0m |
| 2026-05-21 | T7FEE | - | May 21, 19:10 UTC | May 21, 20:00 UTC | 50m |
| 2026-05-21 | T7FEE | - | May 21, 15:10 UTC | May 21, 18:10 UTC | 3h 0m |
| 2026-05-21 | T7FEE | - | May 21, 14:00 UTC | May 21, 14:30 UTC | 30m |
| 2026-05-20 | T7FEE | - | May 20, 16:45 UTC | May 20, 17:05 UTC | 20m |
| 2026-05-20 | T7FEE | ZAZ → LCG | May 20, 15:10 UTC | May 20, 16:15 UTC | 1h 5m |
| 2026-05-19 | T7FEE | - | May 19, 18:00 UTC | May 19, 23:30 UTC | 5h 30m |
| 2026-05-11 | T7FEE | - | May 11, 13:50 UTC | May 11, 16:20 UTC | 2h 30m |
| 2026-05-08 | T7FEE | - | May 8, 16:15 UTC | May 8, 19:40 UTC | 3h 25m |
| 2026-05-07 | T7FEE | TEB → DUS | May 7, 11:10 UTC | May 7, 18:05 UTC | 6h 55m |
| 2026-05-06 | T7FEE | BOS → TEB | May 6, 15:15 UTC | May 6, 16:20 UTC | 1h 5m |
| 2026-05-04 | T7FEE | IAD → BOS | May 4, 18:40 UTC | May 4, 20:00 UTC | 1h 20m |
| 2026-05-02 | T7FEE | - | May 2, 18:25 UTC | May 3, 01:50 UTC | 7h 25m |
| 2026-05-02 | T7FEE | - | May 2, 12:40 UTC | May 2, 17:35 UTC | 4h 55m |
| 2026-04-30 | T7FEE | - | Apr 30, 21:20 UTC | Apr 30, 21:35 UTC | 15m |
| 2026-04-30 | T7FEE | - | Apr 30, 19:20 UTC | Apr 30, 20:40 UTC | 1h 20m |
| 2026-04-27 | T7FEE | - | Apr 27, 10:45 UTC | Apr 27, 17:05 UTC | 6h 20m |
| 2026-04-27 | T7FEE | - | Apr 27, 08:40 UTC | Apr 27, 08:50 UTC | 10m |
| 2026-04-24 | T7FEE | - | Apr 24, 13:25 UTC | Apr 24, 16:45 UTC | 3h 20m |
| 2026-04-23 | T7FEE | - | Apr 23, 17:45 UTC | Apr 23, 21:10 UTC | 3h 25m |
| 2026-04-23 | T7FEE | - | Apr 23, 06:05 UTC | Apr 23, 12:30 UTC | 6h 25m |
| 2026-04-23 | T7FEE | - | Apr 23, 04:25 UTC | Apr 23, 05:15 UTC | 50m |
| 2026-04-20 | T7FEE | - | Apr 20, 16:40 UTC | Apr 20, 21:25 UTC | 4h 45m |
| 2026-04-20 | T7FEE | EMA → MAN | Apr 20, 14:00 UTC | Apr 20, 14:25 UTC | 25m |
| 2026-04-18 | T7FEE | - | Apr 18, 20:20 UTC | Apr 18, 20:35 UTC | 15m |
| 2026-04-18 | T7FEE | - | Apr 18, 13:50 UTC | Apr 18, 19:15 UTC | 5h 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 T7-FEE page for operator, model, and routing details .