sensors Mode-S transponder
A4DCA4
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N412MC · BOEING 747-400 · operated by ATLAS AIR INC
- Hex
- A4DCA4
- Octal
- 51156244
- Decimal
- 10,804,388
- Country
- US
- Tail
- N412MC
- Type
- B744
- Flights observed
- 105
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 6h ago
Last known position
Country allocation
The ICAO 24-bit address A4DCA4 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| GTI612 | Atlas Air | 9 | 2026-04-18 |
| GTI5528 | Atlas Air | 9 | 2026-04-17 |
| GTI733 | Atlas Air | 7 | 2026-05-25 |
| GTI033 | Atlas Air | 7 | 2026-05-27 |
| GTI8838 | Atlas Air | 5 | 2026-05-30 |
| GTI734 | Atlas Air | 4 | 2026-05-25 |
| GTI654 | Atlas Air | 4 | 2026-05-08 |
| GTI5529 | - | 4 | 2026-04-15 |
| GTI036 | Atlas Air | 4 | 2026-05-26 |
| GTI034 | Atlas Air | 4 | 2026-05-28 |
| GTI031 | Atlas Air | 4 | 2026-05-19 |
| GTI8676 | Atlas Air | 3 | 2026-05-10 |
| GTI046 | Atlas Air | 3 | 2026-05-29 |
| GTI8575 | Atlas Air | 2 | 2026-04-24 |
| GTI8499 | Atlas Air | 2 | 2026-05-04 |
| GTI079 | Atlas Air | 2 | 2026-05-17 |
| GTI061 | Atlas Air | 2 | 2026-05-22 |
| GTI058 | Atlas Air | 2 | 2026-05-24 |
| GTI057 | Atlas Air | 2 | 2026-05-23 |
| GTI040 | - | 2 | 2026-04-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | GTI8838 | MIA → LGG | May 30, 03:30 UTC | May 30, 05:10 UTC | 1h 40m |
| 2026-05-29 | GTI046 | GIG → SCL | May 29, 14:20 UTC | May 29, 18:55 UTC | 4h 35m |
| 2026-05-29 | GTI046 | GIG → SCL | May 29, 11:25 UTC | May 29, 11:35 UTC | 10m |
| 2026-05-29 | GTI046 | GIG → SCL | May 29, 04:45 UTC | May 29, 06:35 UTC | 1h 50m |
| 2026-05-28 | GTI045 | MIA → GIG | May 28, 18:20 UTC | May 29, 01:35 UTC | 7h 15m |
| 2026-05-28 | GTI034 | SCL → MIA | May 28, 09:20 UTC | May 28, 14:05 UTC | 4h 45m |
| 2026-05-28 | GTI034 | SCL → MIA | May 28, 06:35 UTC | May 28, 06:45 UTC | 10m |
| 2026-05-27 | GTI033 | MIA → EZE | May 27, 21:45 UTC | May 27, 22:15 UTC | 30m |
| 2026-05-27 | GTI033 | MIA → EZE | May 27, 11:40 UTC | May 27, 19:35 UTC | 7h 55m |
| 2026-05-26 | GTI036 | UIO → MIA | May 26, 11:30 UTC | May 27, 04:04 UTC | 16h 35m |
| 2026-05-25 | GTI734 | SCL → MIA | May 25, 13:00 UTC | May 25, 17:45 UTC | 4h 45m |
| 2026-05-25 | GTI733 | MIA → BOG | May 25, 05:35 UTC | May 25, 06:05 UTC | 30m |
| 2026-05-25 | GTI733 | MIA → BOG | May 25, 01:55 UTC | May 25, 02:10 UTC | 15m |
| 2026-05-24 | GTI733 | MIA → BOG | May 24, 18:05 UTC | May 24, 19:40 UTC | 1h 35m |
| 2026-05-24 | GTI058 | VCP → UIO | May 24, 00:05 UTC | May 24, 11:25 UTC | 11h 20m |
| 2026-05-23 | GTI057 | MIA → VCP | May 23, 13:55 UTC | May 23, 21:05 UTC | 7h 10m |
| 2026-05-23 | GTI062 | SCL → MIA | May 23, 05:10 UTC | May 23, 10:00 UTC | 4h 50m |
| 2026-05-22 | GTI061 | VCP → SCL | May 22, 19:15 UTC | May 22, 21:25 UTC | 2h 10m |
| 2026-05-22 | GTI061 | VCP → SCL | May 22, 08:55 UTC | May 22, 16:05 UTC | 7h 10m |
| 2026-05-21 | GTI9944 | VCP → MIA | May 21, 17:40 UTC | May 22, 01:55 UTC | 8h 15m |
| 2026-05-21 | GTI8667 | MHZ → SPM | May 21, 05:10 UTC | May 21, 14:20 UTC | 9h 10m |
| 2026-05-20 | GTI9445 | RZE → HKG | May 20, 22:25 UTC | May 21, 00:55 UTC | 2h 30m |
| 2026-05-20 | GTI072 | BOG → MIA | May 20, 15:25 UTC | May 20, 18:40 UTC | 3h 15m |
| 2026-05-20 | GTI071 | MIA → BOG | May 20, 09:50 UTC | May 20, 12:45 UTC | 2h 55m |
| 2026-05-19 | GTI032 | VCP → MIA | May 19, 22:35 UTC | May 20, 06:10 UTC | 7h 36m |
| 2026-05-19 | GTI031 | GIG → VCP | May 19, 18:15 UTC | May 19, 19:05 UTC | 50m |
| 2026-05-19 | GTI031 | GIG → VCP | May 19, 08:20 UTC | May 19, 15:50 UTC | 7h 30m |
| 2026-05-18 | GTI734 | SCL → MIA | May 18, 20:05 UTC | May 19, 01:05 UTC | 5h 0m |
| 2026-05-18 | GTI734 | SCL → MIA | May 18, 17:20 UTC | May 18, 17:30 UTC | 10m |
| 2026-05-18 | GTI733 | MIA → BOG | May 18, 12:35 UTC | May 18, 13:00 UTC | 25m |
| 2026-05-18 | GTI733 | MIA → BOG | May 18, 01:20 UTC | May 18, 08:50 UTC | 7h 30m |
| 2026-05-17 | GTI080 | BOG → MIA | May 17, 15:31 UTC | May 17, 18:40 UTC | 3h 10m |
| 2026-05-17 | GTI079 | MIA → BOG | May 17, 10:00 UTC | May 17, 10:25 UTC | 25m |
| 2026-05-17 | GTI079 | MIA → BOG | May 17, 07:25 UTC | May 17, 08:55 UTC | 1h 30m |
| 2026-05-11 | GTI8540 | ICN → MCO | May 11, 01:55 UTC | May 11, 09:25 UTC | 7h 30m |
| 2026-05-10 | GTI8676 | ANC → GDL | May 10, 16:25 UTC | May 10, 21:59 UTC | 5h 35m |
| 2026-05-10 | GTI8676 | ANC → GDL | May 10, 07:55 UTC | May 10, 13:25 UTC | 5h 30m |
| 2026-05-09 | GTI8676 | ANC → GDL | May 9, 16:05 UTC | May 10, 05:40 UTC | 13h 35m |
| 2026-05-08 | GTI9878 | CVG → CVG | May 8, 08:55 UTC | May 8, 23:10 UTC | 14h 15m |
| 2026-05-08 | GTI654 | ANC → ORD | May 8, 01:00 UTC | May 8, 05:54 UTC | 4h 55m |
| 2026-05-07 | GTI654 | ANC → ORD | May 7, 15:25 UTC | May 7, 22:40 UTC | 7h 15m |
| 2026-05-07 | GTI654 | ANC → ORD | May 7, 12:30 UTC | May 7, 13:10 UTC | 40m |
| 2026-05-07 | GTI654 | ANC → ORD | May 7, 10:00 UTC | May 7, 11:40 UTC | 1h 40m |
| 2026-05-04 | GTI8499 | PSM → GRK | May 4, 01:00 UTC | May 4, 16:10 UTC | 15h 10m |
| 2026-05-03 | GTI8499 | PSM → GRK | May 3, 15:20 UTC | May 3, 21:10 UTC | 5h 50m |
| 2026-05-01 | GTI074 | BOG → MIA | May 1, 10:15 UTC | May 1, 10:40 UTC | 25m |
| 2026-05-01 | GTI073 | BOG → MIA | May 1, 02:10 UTC | May 1, 03:45 UTC | 1h 35m |
| 2026-04-30 | GTI034 | SCL → MIA | Apr 30, 18:15 UTC | Apr 30, 23:05 UTC | 4h 50m |
| 2026-04-30 | GTI033 | MIA → EZE | Apr 30, 11:05 UTC | Apr 30, 11:30 UTC | 25m |
| 2026-04-29 | GTI033 | MIA → EZE | Apr 29, 23:55 UTC | Apr 30, 07:40 UTC | 7h 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 N412MC page for operator, model, and routing details .