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
- 183
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2d 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 |
|---|---|---|---|
| GTI538 | - | 28 | 2026-07-08 |
| GTI537 | - | 27 | 2026-07-07 |
| GTI8228 | - | 9 | 2026-06-30 |
| GTI8028 | - | 8 | 2026-06-30 |
| GTI8050 | - | 7 | 2026-06-24 |
| GTI8676 | Atlas Air | 6 | 2026-05-22 |
| GTI8106 | - | 6 | 2026-07-10 |
| GTI8052 | Atlas Air | 6 | 2026-06-07 |
| GTI8230 | Atlas Air | 5 | 2026-05-26 |
| GTI8439 | Atlas Air | 4 | 2026-05-28 |
| GTI8298 | Atlas Air | 4 | 2026-06-22 |
| GTI8755 | - | 3 | 2026-06-27 |
| GTI8418 | - | 3 | 2026-07-11 |
| GTI8414 | Atlas Air | 3 | 2026-06-04 |
| GTI8229 | Atlas Air | 3 | 2026-05-23 |
| GTI8030 | Atlas Air | 3 | 2026-06-08 |
| 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 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-11 | GTI8418 | - | Jul 11, 23:45 UTC | Jul 12, 00:05 UTC | 20m |
| 2026-07-11 | GTI8418 | - | Jul 11, 12:10 UTC | Jul 11, 22:55 UTC | 10h 45m |
| 2026-07-10 | GTI8418 | - | Jul 10, 22:55 UTC | Jul 11, 06:50 UTC | 7h 55m |
| 2026-07-10 | GTI8106 | - | Jul 10, 08:55 UTC | Jul 10, 16:20 UTC | 7h 25m |
| 2026-07-09 | GTI8106 | ICN → ANC | Jul 9, 16:15 UTC | Jul 10, 06:30 UTC | 14h 15m |
| 2026-07-09 | GTI9846 | IAH → CVG | Jul 9, 00:00 UTC | Jul 9, 12:40 UTC | 12h 40m |
| 2026-07-08 | GTI9846 | IAH → CVG | Jul 8, 16:35 UTC | Jul 8, 20:55 UTC | 4h 20m |
| 2026-07-08 | GTI538 | - | Jul 8, 05:45 UTC | Jul 8, 13:20 UTC | 7h 35m |
| 2026-07-07 | GTI538 | - | Jul 7, 08:20 UTC | Jul 8, 03:25 UTC | 19h 5m |
| 2026-07-07 | GTI537 | ANC → ANC | Jul 7, 07:00 UTC | Jul 8, 03:25 UTC | 20h 25m |
| 2026-07-06 | GTI537 | - | Jul 6, 20:25 UTC | Jul 7, 04:25 UTC | 8h 0m |
| 2026-07-06 | GTI8106 | - | Jul 6, 09:45 UTC | Jul 6, 16:55 UTC | 7h 10m |
| 2026-07-05 | GTI8106 | - | Jul 5, 23:50 UTC | Jul 6, 07:10 UTC | 7h 20m |
| 2026-07-03 | GTI8107 | ANC → ICN | Jul 3, 04:25 UTC | Jul 3, 05:00 UTC | 35m |
| 2026-07-02 | GTI8286 | - | Jul 2, 12:45 UTC | Jul 3, 01:25 UTC | 12h 40m |
| 2026-07-02 | GTI8286 | - | Jul 2, 05:40 UTC | Jul 2, 10:15 UTC | 4h 35m |
| 2026-07-01 | GTI032 | VCP → MIA | Jul 1, 17:45 UTC | Jul 2, 01:20 UTC | 7h 35m |
| 2026-07-01 | GTI031 | - | Jul 1, 13:45 UTC | Jul 1, 14:30 UTC | 45m |
| 2026-07-01 | GTI031 | - | Jul 1, 02:55 UTC | Jul 1, 10:55 UTC | 8h 0m |
| 2026-06-30 | GTI8028 | - | Jun 30, 20:35 UTC | Jun 30, 22:25 UTC | 1h 50m |
| 2026-06-30 | GTI8028 | - | Jun 30, 14:35 UTC | Jun 30, 14:45 UTC | 10m |
| 2026-06-30 | GTI8228 | - | Jun 30, 08:15 UTC | Jun 30, 11:10 UTC | 2h 55m |
| 2026-06-29 | GTI8228 | - | Jun 29, 20:15 UTC | Jun 30, 03:35 UTC | 7h 21m |
| 2026-06-28 | GTI8228 | - | Jun 28, 10:10 UTC | Jun 28, 17:34 UTC | 7h 25m |
| 2026-06-27 | GTI8228 | - | Jun 27, 21:50 UTC | Jun 28, 07:14 UTC | 9h 25m |
| 2026-06-27 | GTI8755 | - | Jun 27, 14:29 UTC | Jun 27, 15:00 UTC | 30m |
| 2026-06-26 | GTI8185 | - | Jun 26, 05:19 UTC | Jun 26, 05:44 UTC | 25m |
| 2026-06-25 | GTI8185 | - | Jun 25, 18:10 UTC | Jun 26, 04:24 UTC | 10h 15m |
| 2026-06-25 | GTI5219 | - | Jun 25, 04:35 UTC | Jun 25, 12:40 UTC | 8h 5m |
| 2026-06-24 | GTI8050 | - | Jun 24, 12:54 UTC | Jun 25, 00:44 UTC | 11h 50m |
| 2026-06-24 | GTI8050 | - | Jun 24, 01:55 UTC | Jun 24, 09:24 UTC | 7h 30m |
| 2026-06-23 | GTI8050 | - | Jun 23, 13:05 UTC | Jun 23, 20:19 UTC | 7h 15m |
| 2026-06-23 | GTI8050 | HKG → ANC | Jun 23, 01:25 UTC | Jun 23, 10:44 UTC | 9h 20m |
| 2026-06-22 | GTI8298 | NGU → HHN | Jun 22, 18:44 UTC | Jun 22, 19:14 UTC | 30m |
| 2026-06-22 | GTI8298 | NGU → HHN | Jun 22, 01:49 UTC | Jun 22, 18:00 UTC | 16h 10m |
| 2026-06-21 | GTI8298 | NGU → HHN | Jun 21, 14:44 UTC | Jun 21, 23:30 UTC | 8h 45m |
| 2026-06-21 | GTI8298 | NGU → HHN | Jun 21, 08:15 UTC | Jun 21, 10:19 UTC | 2h 5m |
| 2026-06-20 | GTI538 | - | Jun 20, 12:14 UTC | Jun 20, 19:24 UTC | 7h 10m |
| 2026-06-19 | GTI538 | - | Jun 19, 14:44 UTC | Jun 20, 10:09 UTC | 19h 25m |
| 2026-06-19 | GTI538 | - | Jun 19, 10:19 UTC | Jun 20, 10:09 UTC | 23h 50m |
| 2026-06-19 | GTI537 | - | Jun 19, 08:50 UTC | Jun 20, 04:20 UTC | 19h 30m |
| 2026-06-18 | GTI537 | - | Jun 18, 22:20 UTC | Jun 19, 06:39 UTC | 8h 19m |
| 2026-06-18 | GTI538 | ANC → MIA | Jun 18, 10:45 UTC | Jun 18, 17:45 UTC | 7h 0m |
| 2026-06-17 | GTI538 | - | Jun 17, 15:46 UTC | Jun 18, 07:30 UTC | 15h 45m |
| 2026-06-17 | GTI538 | - | Jun 17, 10:20 UTC | Jun 18, 07:30 UTC | 21h 10m |
| 2026-06-17 | GTI537 | - | Jun 17, 10:10 UTC | Jun 18, 07:30 UTC | 21h 20m |
| 2026-06-16 | GTI537 | - | Jun 16, 23:55 UTC | Jun 17, 07:40 UTC | 7h 45m |
| 2026-06-16 | GTI538 | ANC → MIA | Jun 16, 07:55 UTC | Jun 16, 14:50 UTC | 6h 55m |
| 2026-06-15 | GTI538 | - | Jun 15, 10:20 UTC | Jun 16, 05:34 UTC | 19h 15m |
| 2026-06-15 | GTI537 | ANC → ANC | Jun 15, 08:49 UTC | Jun 16, 05:34 UTC | 20h 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 N857GT page for operator, model, and routing details .