sensors Mode-S transponder
A4F6A5
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N419MC · BOEING 747-400 · operated by ATLAS AIR INC
- Hex
- A4F6A5
- Octal
- 51173245
- Decimal
- 10,811,045
- Country
- US
- Tail
- N419MC
- Type
- B744
- Flights observed
- 65
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 10d ago
Last known position
Country allocation
The ICAO 24-bit address A4F6A5 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 |
|---|---|---|---|
| GTI8174 | Atlas Air | 9 | 2026-04-15 |
| GTI8961 | - | 5 | 2026-04-13 |
| GTI8102 | Atlas Air | 4 | 2026-04-29 |
| GTI8439 | Atlas Air | 3 | 2026-04-23 |
| GTI8312 | Atlas Air | 3 | 2026-04-27 |
| GTI8282 | Atlas Air | 3 | 2026-05-06 |
| GTI8120 | Atlas Air | 3 | 2026-05-11 |
| GTI512 | Atlas Air | 3 | 2026-04-23 |
| GTI9919 | Atlas Air | 2 | 2026-05-18 |
| GTI9893 | Atlas Air | 2 | 2026-05-16 |
| GTI9681 | Atlas Air | 2 | 2026-04-30 |
| GTI8860 | Atlas Air | 2 | 2026-05-17 |
| GTI8535 | Atlas Air | 2 | 2026-05-19 |
| GTI8422 | Atlas Air | 2 | 2026-04-25 |
| GTI8311 | Atlas Air | 2 | 2026-05-15 |
| GTI8173 | - | 2 | 2026-04-13 |
| GTI8154 | Atlas Air | 2 | 2026-05-03 |
| GTI8153 | Atlas Air | 2 | 2026-05-02 |
| GTI8139 | Atlas Air | 2 | 2026-05-16 |
| GTI812 | Atlas Air | 2 | 2026-05-04 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-19 | GTI8535 | PSM → AEX | May 19, 10:10 UTC | May 19, 22:50 UTC | 12h 40m |
| 2026-05-18 | GTI8535 | PSM → AEX | May 18, 21:25 UTC | May 19, 02:20 UTC | 4h 55m |
| 2026-05-18 | GTI9919 | ORD → OKO | May 18, 03:30 UTC | May 18, 04:00 UTC | 30m |
| 2026-05-17 | GTI9919 | ORD → OKO | May 17, 16:01 UTC | May 17, 23:00 UTC | 7h 0m |
| 2026-05-17 | GTI8860 | FOE → HHN | May 17, 07:30 UTC | May 17, 12:55 UTC | 5h 25m |
| 2026-05-16 | GTI8860 | FOE → HHN | May 16, 21:20 UTC | May 17, 05:05 UTC | 7h 45m |
| 2026-05-16 | GTI8140 | DEL → HKG | May 16, 12:16 UTC | May 16, 18:50 UTC | 6h 35m |
| 2026-05-16 | GTI8139 | HKG → DEL | May 16, 07:05 UTC | May 16, 09:51 UTC | 2h 45m |
| 2026-05-16 | GTI8139 | HKG → DEL | May 16, 04:45 UTC | May 16, 04:55 UTC | 10m |
| 2026-05-16 | GTI9893 | NKW → HKG | May 16, 01:10 UTC | May 16, 01:30 UTC | 20m |
| 2026-05-15 | GTI9893 | NKW → HKG | May 15, 10:55 UTC | May 15, 23:10 UTC | 12h 14m |
| 2026-05-15 | GTI8311 | HHN → PSM | May 15, 05:40 UTC | May 15, 05:50 UTC | 10m |
| 2026-05-14 | GTI8311 | HHN → PSM | May 14, 23:30 UTC | May 15, 04:35 UTC | 5h 5m |
| 2026-05-13 | GTI9892 | ORD → OKO | May 13, 00:55 UTC | May 13, 13:31 UTC | 12h 35m |
| 2026-05-11 | GTI8120 | HOP → HHN | May 11, 18:10 UTC | May 11, 22:35 UTC | 4h 24m |
| 2026-05-11 | GTI8120 | HOP → HHN | May 11, 08:30 UTC | May 11, 15:40 UTC | 7h 10m |
| 2026-05-10 | GTI8120 | HOP → HHN | May 10, 18:25 UTC | May 11, 15:40 UTC | 21h 15m |
| 2026-05-08 | GTI8570 | HKG → GYD | May 8, 20:20 UTC | May 9, 11:25 UTC | 15h 5m |
| 2026-05-07 | GTI792 | PVG → ANC | May 7, 18:15 UTC | May 8, 00:40 UTC | 6h 24m |
| 2026-05-07 | GTI792 | PVG → ANC | May 7, 02:20 UTC | May 7, 16:10 UTC | 13h 50m |
| 2026-05-06 | GTI8282 | PSM → HHN | May 6, 19:40 UTC | May 6, 19:55 UTC | 15m |
| 2026-05-06 | GTI8282 | PSM → HHN | May 6, 01:50 UTC | May 6, 18:50 UTC | 16h 59m |
| 2026-05-05 | GTI8282 | PSM → HHN | May 5, 14:50 UTC | May 5, 23:35 UTC | 8h 45m |
| 2026-05-04 | GTI811 | LAX → ICN | May 4, 15:50 UTC | May 4, 18:40 UTC | 2h 51m |
| 2026-05-04 | GTI812 | PVG → ANC | May 4, 08:15 UTC | May 4, 13:30 UTC | 5h 15m |
| 2026-05-03 | GTI812 | PVG → ANC | May 3, 16:20 UTC | May 4, 05:35 UTC | 13h 15m |
| 2026-05-03 | GTI8154 | AMS → ORD | May 3, 07:40 UTC | May 3, 07:55 UTC | 15m |
| 2026-05-02 | GTI8154 | AMS → ORD | May 2, 20:00 UTC | May 3, 06:40 UTC | 10h 39m |
| 2026-05-02 | GTI8153 | CKG → AMS | May 2, 08:15 UTC | May 2, 12:45 UTC | 4h 30m |
| 2026-05-01 | GTI8153 | CKG → AMS | May 1, 15:30 UTC | May 2, 12:45 UTC | 21h 16m |
| 2026-04-30 | GTI9681 | MIA → ANC | Apr 30, 12:45 UTC | Apr 30, 21:25 UTC | 8h 40m |
| 2026-04-30 | GTI9681 | MIA → ANC | Apr 30, 02:40 UTC | Apr 30, 11:00 UTC | 8h 20m |
| 2026-04-29 | GTI8102 | DFW → ORD | Apr 29, 04:00 UTC | Apr 29, 12:40 UTC | 8h 41m |
| 2026-04-28 | GTI8102 | DFW → ORD | Apr 28, 19:15 UTC | Apr 29, 00:59 UTC | 5h 45m |
| 2026-04-28 | GTI8102 | DFW → ORD | Apr 28, 11:50 UTC | Apr 28, 17:25 UTC | 5h 35m |
| 2026-04-27 | GTI8102 | DFW → ORD | Apr 27, 19:55 UTC | Apr 28, 09:55 UTC | 14h 0m |
| 2026-04-27 | GTI8312 | DOV → RMS | Apr 27, 16:40 UTC | Apr 27, 17:00 UTC | 20m |
| 2026-04-27 | GTI8312 | DOV → RMS | Apr 27, 07:10 UTC | Apr 27, 16:00 UTC | 8h 50m |
| 2026-04-26 | CMB382 | - | Apr 26, 18:20 UTC | Apr 27, 03:00 UTC | 8h 40m |
| 2026-04-26 | GTI8312 | DOV → RMS | Apr 26, 08:45 UTC | Apr 26, 10:40 UTC | 1h 55m |
| 2026-04-25 | GTI8422 | ANC → MIA | Apr 25, 19:10 UTC | Apr 26, 02:25 UTC | 7h 15m |
| 2026-04-24 | GTI8422 | ANC → MIA | Apr 24, 08:20 UTC | Apr 24, 20:25 UTC | 12h 5m |
| 2026-04-23 | GTI8439 | HNL → HKG | Apr 23, 15:00 UTC | Apr 24, 06:35 UTC | 15h 35m |
| 2026-04-23 | GTI8439 | HNL → HKG | Apr 23, 11:50 UTC | Apr 23, 12:15 UTC | 25m |
| 2026-04-23 | GTI8439 | HNL → HKG | Apr 23, 06:50 UTC | Apr 23, 07:45 UTC | 55m |
| 2026-04-23 | GTI512 | ANC → ORD | Apr 23, 00:25 UTC | Apr 23, 04:05 UTC | 3h 40m |
| 2026-04-22 | GTI512 | ANC → ORD | Apr 22, 13:25 UTC | Apr 22, 18:30 UTC | 5h 5m |
| 2026-04-21 | GTI512 | ANC → ORD | Apr 21, 21:40 UTC | Apr 22, 10:45 UTC | 13h 5m |
| 2026-04-21 | GTI9038 | ORD → ICN | Apr 21, 05:30 UTC | Apr 21, 19:35 UTC | 14h 5m |
| 2026-04-15 | GTI8174 | ANC → NLU | Apr 15, 07:01 UTC | Apr 15, 08:10 UTC | 1h 10m |
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 N419MC page for operator, model, and routing details .