sensors Mode-S transponder
4BB439
ICAO 24-bit transponder address · allocated to Turkey
Currently assigned to TC-MAY · GULFSTREAM 4
- Hex
- 4BB439
- Octal
- 22732071
- Decimal
- 4,961,337
- Country
- TR
- Tail
- TC-MAY
- Type
- GLF4
- Flights observed
- 35
- Distinct callsigns
- 1
- Country
- TR
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 4BB439 falls within the block assigned to Turkey (TR) by ICAO Annex 10, Volume III. Every aircraft registered in Turkey 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 |
|---|---|---|---|
| TCMAY | - | 15 | 2026-06-11 |
Recent flights last 35
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-11 | TCMAY | - | Jun 11, 13:35 UTC | Jun 11, 14:30 UTC | 55m |
| 2026-06-11 | TCMAY | - | Jun 11, 04:25 UTC | Jun 11, 05:15 UTC | 50m |
| 2026-06-09 | TCMAY | - | Jun 9, 11:05 UTC | Jun 9, 14:20 UTC | 3h 15m |
| 2026-06-08 | TCMAY | - | Jun 8, 19:15 UTC | Jun 9, 14:20 UTC | 19h 5m |
| 2026-06-08 | TCMAY | BXN → ISL | Jun 8, 14:30 UTC | Jun 8, 16:05 UTC | 1h 35m |
| 2026-06-03 | TCMAY | - | Jun 3, 10:35 UTC | Jun 3, 11:15 UTC | 40m |
| 2026-06-02 | TCMAY | - | Jun 2, 14:20 UTC | Jun 3, 11:15 UTC | 20h 55m |
| 2026-06-02 | TCMAY | - | Jun 2, 13:50 UTC | Jun 3, 11:15 UTC | 21h 25m |
| 2026-06-02 | TCMAY | - | Jun 2, 11:15 UTC | Jun 2, 11:55 UTC | 40m |
| 2026-05-29 | TCMAY | - | May 29, 03:00 UTC | May 29, 06:40 UTC | 3h 40m |
| 2026-05-28 | TCMAY | - | May 28, 03:25 UTC | May 28, 05:55 UTC | 2h 30m |
| 2026-05-27 | TCMAY | - | May 27, 23:25 UTC | May 28, 01:40 UTC | 2h 15m |
| 2026-05-21 | TCMAY | - | May 21, 07:00 UTC | May 21, 11:05 UTC | 4h 5m |
| 2026-05-21 | TCMAY | - | May 21, 04:55 UTC | May 21, 05:20 UTC | 25m |
| 2026-05-20 | TCMAY | - | May 20, 11:20 UTC | May 20, 11:40 UTC | 20m |
| 2026-05-19 | - | - | May 19, 23:10 UTC | May 19, 23:20 UTC | 10m |
| 2026-05-19 | - | - | May 19, 15:55 UTC | May 19, 17:15 UTC | 1h 20m |
| 2026-05-18 | - | - | May 18, 16:20 UTC | May 19, 16:15 UTC | 23h 54m |
| 2026-05-18 | - | - | May 18, 15:50 UTC | May 18, 16:50 UTC | 1h 0m |
| 2026-05-15 | - | - | May 15, 10:05 UTC | May 15, 10:40 UTC | 35m |
| 2026-05-12 | - | - | May 12, 12:40 UTC | May 12, 13:05 UTC | 25m |
| 2026-05-11 | - | - | May 11, 14:25 UTC | May 12, 13:05 UTC | 22h 41m |
| 2026-05-11 | - | - | May 11, 11:50 UTC | May 11, 15:50 UTC | 4h 0m |
| 2026-05-07 | - | - | May 7, 13:00 UTC | May 7, 13:25 UTC | 25m |
| 2026-05-04 | - | - | May 4, 12:25 UTC | May 4, 17:15 UTC | 4h 50m |
| 2026-05-02 | - | - | May 2, 08:45 UTC | May 2, 09:05 UTC | 20m |
| 2026-05-01 | - | - | May 1, 13:25 UTC | May 1, 17:45 UTC | 4h 20m |
| 2026-04-30 | - | - | Apr 30, 20:50 UTC | May 1, 00:55 UTC | 4h 5m |
| 2026-04-26 | - | - | Apr 26, 14:20 UTC | Apr 26, 14:40 UTC | 20m |
| 2026-04-26 | - | - | Apr 26, 00:40 UTC | Apr 26, 01:50 UTC | 1h 10m |
| 2026-04-21 | - | - | Apr 21, 13:55 UTC | Apr 21, 15:05 UTC | 1h 10m |
| 2026-04-19 | - | - | Apr 19, 11:15 UTC | Apr 19, 12:05 UTC | 50m |
| 2026-04-17 | - | - | Apr 17, 12:00 UTC | Apr 17, 12:25 UTC | 25m |
| 2026-04-15 | - | - | Apr 15, 19:10 UTC | Apr 15, 19:40 UTC | 30m |
| 2026-04-13 | - | - | Apr 13, 21:05 UTC | Apr 13, 21:30 UTC | 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 TC-MAY page for operator, model, and routing details .