sensors Mode-S transponder
ABC201
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N857GT · BOEING 747-8 · operated by ATLAS AIR INC
- Hex
- ABC201
- Octal
- 52741001
- Decimal
- 11,256,321
- Country
- US
- Tail
- N857GT
- Type
- B748
- Flights observed
- 99
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 11h ago
Last known position
Country allocation
The ICAO 24-bit address ABC201 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 |
|---|---|---|---|
| GTI537 | Atlas Air | 15 | 2026-05-15 |
| GTI538 | Atlas Air | 13 | 2026-05-16 |
| GTI8676 | Atlas Air | 6 | 2026-05-22 |
| GTI8028 | Atlas Air | 6 | 2026-05-23 |
| GTI8230 | Atlas Air | 5 | 2026-05-26 |
| GTI8228 | Atlas Air | 5 | 2026-04-25 |
| GTI8439 | Atlas Air | 4 | 2026-05-28 |
| GTI8229 | Atlas Air | 3 | 2026-05-23 |
| GTI8050 | Atlas Air | 3 | 2026-05-12 |
| GTI5561 | Atlas Air | 3 | 2026-04-23 |
| GTI5559 | Atlas Air | 3 | 2026-04-28 |
| GTI554 | Atlas Air | 3 | 2026-05-05 |
| GTI056 | Atlas Air | 3 | 2026-04-27 |
| GTI8755 | Atlas Air | 2 | 2026-04-23 |
| GTI8236 | Atlas Air | 2 | 2026-05-27 |
| GTI8106 | Atlas Air | 2 | 2026-05-29 |
| GTI8052 | Atlas Air | 2 | 2026-05-17 |
| GTI8030 | Atlas Air | 2 | 2026-05-18 |
| GTI753 | Atlas Air | 2 | 2026-05-20 |
| GTI557 | Atlas Air | 2 | 2026-05-06 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | GTI8106 | ANC → DFW | May 29, 11:20 UTC | May 29, 18:55 UTC | 7h 35m |
| 2026-05-28 | GTI8106 | ANC → DFW | May 28, 17:50 UTC | May 29, 08:55 UTC | 15h 5m |
| 2026-05-28 | GTI8439 | HNL → HKG | May 28, 11:55 UTC | May 28, 14:25 UTC | 2h 30m |
| 2026-05-27 | GTI8439 | HNL → HKG | May 27, 23:15 UTC | May 27, 23:25 UTC | 10m |
| 2026-05-27 | GTI8439 | HNL → HKG | May 27, 19:35 UTC | May 27, 20:00 UTC | 25m |
| 2026-05-27 | GTI8439 | HNL → HKG | May 27, 15:15 UTC | May 27, 15:40 UTC | 25m |
| 2026-05-27 | GTI8093 | SCL → MIA | May 27, 07:45 UTC | May 27, 12:40 UTC | 4h 55m |
| 2026-05-27 | GTI8236 | SCL → MIA | May 27, 00:14 UTC | May 27, 05:04 UTC | 4h 50m |
| 2026-05-26 | GTI8236 | SCL → MIA | May 26, 21:09 UTC | May 26, 21:20 UTC | 10m |
| 2026-05-26 | GTI8230 | MIA → AMS | May 26, 14:30 UTC | May 26, 16:45 UTC | 2h 15m |
| 2026-05-26 | GTI8230 | MIA → AMS | May 26, 04:04 UTC | May 26, 11:24 UTC | 7h 20m |
| 2026-05-25 | GTI8230 | MIA → AMS | May 25, 15:55 UTC | May 25, 23:30 UTC | 7h 34m |
| 2026-05-25 | GTI8230 | MIA → AMS | May 25, 05:35 UTC | May 25, 14:25 UTC | 8h 50m |
| 2026-05-25 | GTI8230 | MIA → AMS | May 25, 04:45 UTC | May 25, 05:05 UTC | 20m |
| 2026-05-23 | GTI8229 | LAX → ANC | May 23, 20:30 UTC | May 24, 10:35 UTC | 14h 5m |
| 2026-05-23 | GTI8028 | LAX → ICN | May 23, 09:25 UTC | May 23, 17:05 UTC | 7h 40m |
| 2026-05-22 | GTI8028 | LAX → ICN | May 22, 21:35 UTC | May 23, 05:50 UTC | 8h 14m |
| 2026-05-22 | GTI8676 | ANC → GDL | May 22, 13:00 UTC | May 22, 18:45 UTC | 5h 45m |
| 2026-05-22 | GTI8676 | ANC → GDL | May 22, 04:50 UTC | May 22, 10:15 UTC | 5h 25m |
| 2026-05-21 | GTI8676 | ANC → GDL | May 21, 12:55 UTC | May 22, 02:25 UTC | 13h 30m |
| 2026-05-20 | GTI754 | ORD → ICN | May 20, 18:25 UTC | May 21, 09:25 UTC | 15h 0m |
| 2026-05-20 | GTI753 | PVG → ANC | May 20, 09:50 UTC | May 20, 14:45 UTC | 4h 55m |
| 2026-05-19 | GTI753 | PVG → ANC | May 19, 19:05 UTC | May 20, 07:45 UTC | 12h 41m |
| 2026-05-19 | GTI8028 | LAX → ICN | May 19, 04:30 UTC | May 19, 17:15 UTC | 12h 45m |
| 2026-05-18 | GTI8028 | LAX → ICN | May 18, 19:35 UTC | May 19, 00:35 UTC | 5h 0m |
| 2026-05-18 | GTI8030 | LAX → GRU | May 18, 01:25 UTC | May 18, 06:05 UTC | 4h 40m |
| 2026-05-17 | GTI8030 | LAX → GRU | May 17, 22:30 UTC | May 17, 22:40 UTC | 10m |
| 2026-05-17 | GTI8052 | ANC → MIA | May 17, 15:45 UTC | May 17, 18:05 UTC | 2h 20m |
| 2026-05-17 | GTI8052 | ANC → MIA | May 17, 03:55 UTC | May 17, 11:20 UTC | 7h 25m |
| 2026-05-16 | GTI538 | ANC → LAX | May 16, 16:20 UTC | May 16, 23:50 UTC | 7h 30m |
| 2026-05-15 | GTI538 | ANC → LAX | May 15, 18:20 UTC | May 16, 14:11 UTC | 19h 51m |
| 2026-05-15 | GTI538 | ANC → LAX | May 15, 18:00 UTC | May 16, 14:11 UTC | 20h 11m |
| 2026-05-15 | GTI537 | ANC → ICN | May 15, 05:25 UTC | May 15, 13:05 UTC | 7h 40m |
| 2026-05-12 | GTI8050 | ANC → MIA | May 12, 18:45 UTC | May 12, 19:40 UTC | 55m |
| 2026-05-12 | GTI8050 | ANC → MIA | May 12, 12:30 UTC | May 12, 18:40 UTC | 6h 10m |
| 2026-05-12 | GTI8050 | ANC → MIA | May 12, 03:30 UTC | May 12, 10:30 UTC | 7h 0m |
| 2026-05-10 | GTI8229 | LAX → ANC | May 10, 11:50 UTC | May 10, 12:15 UTC | 25m |
| 2026-05-09 | GTI8229 | LAX → ANC | May 9, 20:40 UTC | May 10, 01:04 UTC | 4h 25m |
| 2026-05-09 | GTI8028 | LAX → ICN | May 9, 08:50 UTC | May 9, 17:00 UTC | 8h 10m |
| 2026-05-08 | GTI8028 | LAX → ICN | May 8, 21:55 UTC | May 9, 05:25 UTC | 7h 30m |
| 2026-05-08 | GTI8676 | ANC → GDL | May 8, 13:10 UTC | May 8, 18:55 UTC | 5h 45m |
| 2026-05-08 | GTI8676 | ANC → GDL | May 8, 04:44 UTC | May 8, 09:59 UTC | 5h 15m |
| 2026-05-07 | GTI8676 | ANC → GDL | May 7, 13:05 UTC | May 8, 02:24 UTC | 13h 20m |
| 2026-05-06 | GTI8451 | DFW → HKG | May 6, 17:50 UTC | May 7, 07:40 UTC | 13h 50m |
| 2026-05-06 | GTI557 | ANC → ORD | May 6, 09:30 UTC | May 6, 14:40 UTC | 5h 10m |
| 2026-05-05 | GTI557 | ANC → ORD | May 5, 21:15 UTC | May 6, 06:30 UTC | 9h 15m |
| 2026-05-05 | GTI554 | ORD → ANC | May 5, 15:01 UTC | May 5, 15:35 UTC | 35m |
| 2026-05-04 | GTI554 | ORD → ANC | May 4, 15:10 UTC | May 5, 03:40 UTC | 12h 31m |
| 2026-05-04 | GTI554 | ORD → ANC | May 4, 07:15 UTC | May 4, 12:55 UTC | 5h 40m |
| 2026-04-30 | GTI5560 | SDF → MSP | Apr 30, 13:45 UTC | Apr 30, 15:40 UTC | 1h 55m |
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 N857GT page for operator, model, and routing details .