sensors Mode-S transponder
A523C6
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N430GT · BOEING 747-400 · operated by ATLAS AIR INC
- Hex
- A523C6
- Octal
- 51221706
- Decimal
- 10,822,598
- Country
- US
- Tail
- N430GT
- Type
- B744
- Flights observed
- 101
- Distinct callsigns
- 6
- Country
- US
- Last broadcast
- 2h ago
Current position
Country allocation
The ICAO 24-bit address A523C6 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 6 distinct
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | GTI8602 | ORD → ICN | May 30, 02:30 UTC | May 30, 05:25 UTC | 2h 55m |
| 2026-05-28 | GTI8603 | MIA → MST | May 28, 13:15 UTC | May 28, 19:25 UTC | 6h 10m |
| 2026-05-27 | GTI8603 | MIA → MST | May 27, 17:15 UTC | May 28, 11:25 UTC | 18h 10m |
| 2026-05-27 | GTI8603 | MIA → MST | May 27, 11:35 UTC | May 28, 11:25 UTC | 23h 50m |
| 2026-05-27 | GTI8602 | ORD → ICN | May 27, 11:05 UTC | May 28, 05:40 UTC | 18h 35m |
| 2026-05-27 | GTI8602 | ORD → ICN | May 27, 02:24 UTC | May 27, 09:15 UTC | 6h 50m |
| 2026-05-26 | GTI8603 | MIA → MST | May 26, 11:15 UTC | May 26, 17:25 UTC | 6h 10m |
| 2026-05-25 | GTI8603 | MIA → MST | May 25, 13:40 UTC | May 26, 09:25 UTC | 19h 44m |
| 2026-05-25 | GTI8602 | ORD → ICN | May 25, 12:15 UTC | May 26, 09:25 UTC | 21h 10m |
| 2026-05-25 | GTI8602 | ORD → ICN | May 25, 04:00 UTC | May 25, 10:35 UTC | 6h 35m |
| 2026-05-24 | GTI8603 | MIA → MST | May 24, 11:25 UTC | May 24, 17:40 UTC | 6h 15m |
| 2026-05-23 | GTI8603 | MIA → MST | May 23, 17:15 UTC | May 24, 09:05 UTC | 15h 51m |
| 2026-05-23 | GTI8603 | MIA → MST | May 23, 11:35 UTC | May 24, 09:05 UTC | 21h 30m |
| 2026-05-23 | GTI8602 | ORD → ICN | May 23, 11:20 UTC | May 24, 09:05 UTC | 21h 45m |
| 2026-05-23 | GTI8602 | ORD → ICN | May 23, 02:40 UTC | May 23, 09:20 UTC | 6h 40m |
| 2026-05-21 | GTI8603 | MIA → MST | May 21, 11:45 UTC | May 21, 18:05 UTC | 6h 20m |
| 2026-05-20 | GTI8603 | MIA → MST | May 20, 17:55 UTC | May 21, 09:30 UTC | 15h 35m |
| 2026-05-20 | GTI8603 | MIA → MST | May 20, 11:45 UTC | May 21, 09:30 UTC | 21h 45m |
| 2026-05-20 | GTI8602 | ORD → ICN | May 20, 02:50 UTC | May 20, 09:35 UTC | 6h 46m |
| 2026-05-19 | GTI8603 | MIA → MST | May 19, 11:45 UTC | May 19, 18:10 UTC | 6h 25m |
| 2026-05-18 | GTI8603 | MIA → MST | May 18, 17:25 UTC | May 19, 09:30 UTC | 16h 4m |
| 2026-05-18 | GTI8603 | MIA → MST | May 18, 11:35 UTC | May 19, 09:30 UTC | 21h 54m |
| 2026-05-18 | GTI8602 | ORD → ICN | May 18, 11:20 UTC | May 19, 09:30 UTC | 22h 9m |
| 2026-05-18 | GTI8602 | ORD → ICN | May 18, 02:10 UTC | May 18, 08:55 UTC | 6h 45m |
| 2026-05-17 | GTI8603 | MIA → MST | May 17, 13:15 UTC | May 17, 19:20 UTC | 6h 5m |
| 2026-05-16 | GTI8603 | MIA → MST | May 16, 17:55 UTC | May 17, 11:20 UTC | 17h 25m |
| 2026-05-16 | GTI8603 | MIA → MST | May 16, 11:46 UTC | May 17, 11:20 UTC | 23h 35m |
| 2026-05-16 | GTI8602 | ORD → ICN | May 16, 02:25 UTC | May 16, 09:10 UTC | 6h 46m |
| 2026-05-14 | GTI8603 | MIA → MST | May 14, 13:15 UTC | May 14, 19:35 UTC | 6h 20m |
| 2026-05-13 | GTI8603 | MIA → MST | May 13, 15:35 UTC | May 14, 11:30 UTC | 19h 55m |
| 2026-05-13 | GTI8603 | MIA → MST | May 13, 14:55 UTC | May 14, 11:30 UTC | 20h 35m |
| 2026-05-13 | GTI8602 | ORD → ICN | May 13, 04:15 UTC | May 13, 11:10 UTC | 6h 55m |
| 2026-05-12 | GTI8603 | MIA → MST | May 12, 11:45 UTC | May 12, 18:00 UTC | 6h 15m |
| 2026-05-11 | GTI8603 | MIA → MST | May 11, 17:35 UTC | May 12, 09:10 UTC | 15h 35m |
| 2026-05-11 | GTI8602 | ORD → ICN | May 11, 11:35 UTC | May 12, 09:10 UTC | 21h 36m |
| 2026-05-11 | GTI8602 | ORD → ICN | May 11, 02:25 UTC | May 11, 09:15 UTC | 6h 50m |
| 2026-05-10 | GTI8603 | MIA → MST | May 10, 14:34 UTC | May 10, 20:45 UTC | 6h 10m |
| 2026-05-09 | GTI8603 | MIA → MST | May 9, 18:05 UTC | May 10, 12:25 UTC | 18h 20m |
| 2026-05-09 | GTI8602 | ORD → ICN | May 9, 11:40 UTC | May 10, 11:30 UTC | 23h 50m |
| 2026-05-09 | GTI8602 | ORD → ICN | May 9, 02:55 UTC | May 9, 09:40 UTC | 6h 45m |
| 2026-05-08 | GTI812 | PVG → ANC | May 8, 12:44 UTC | May 8, 18:50 UTC | 6h 5m |
| 2026-05-07 | GTI812 | PVG → ANC | May 7, 17:55 UTC | May 8, 06:50 UTC | 12h 55m |
| 2026-05-06 | GTI8439 | HNL → HKG | May 6, 20:36 UTC | May 7, 12:40 UTC | 16h 4m |
| 2026-05-06 | GTI8439 | HNL → HKG | May 6, 11:35 UTC | May 6, 16:30 UTC | 4h 55m |
| 2026-05-06 | GTI9377 | ORD → ICN | May 6, 05:15 UTC | May 6, 08:01 UTC | 2h 45m |
| 2026-05-01 | GTI9031 | MIA → LAX | May 1, 08:15 UTC | May 1, 12:15 UTC | 4h 0m |
| 2026-04-30 | GTI8603 | MIA → MST | Apr 30, 11:25 UTC | Apr 30, 17:45 UTC | 6h 20m |
| 2026-04-29 | GTI8603 | MIA → MST | Apr 29, 17:55 UTC | Apr 30, 09:30 UTC | 15h 34m |
| 2026-04-29 | GTI8603 | MIA → MST | Apr 29, 11:35 UTC | Apr 30, 09:30 UTC | 21h 54m |
| 2026-04-29 | GTI8602 | ORD → ICN | Apr 29, 02:09 UTC | Apr 29, 08:55 UTC | 6h 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 N430GT page for operator, model, and routing details .