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
Broadcasting now · callsign GTI8602 · 36,000 ft
Flights observed
101
Distinct callsigns
6
Country
US
Last broadcast
2h ago

Current position

A523C6 is currently broadcasting. Map zoomed to live 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

Callsign Airline Flights Last seen
GTI8603 Atlas Air 52 2026-05-28
GTI8602 Atlas Air 43 2026-05-30
GTI8439 Atlas Air 2 2026-05-06
GTI812 Atlas Air 2 2026-05-08
GTI9377 Atlas Air 1 2026-05-06
GTI9031 Atlas Air 1 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 GTI8602 ORD → ICN May 30, 02:30 UTCMay 30, 05:25 UTC2h 55m
2026-05-28 GTI8603 MIA → MST May 28, 13:15 UTCMay 28, 19:25 UTC6h 10m
2026-05-27 GTI8603 MIA → MST May 27, 17:15 UTCMay 28, 11:25 UTC18h 10m
2026-05-27 GTI8603 MIA → MST May 27, 11:35 UTCMay 28, 11:25 UTC23h 50m
2026-05-27 GTI8602 ORD → ICN May 27, 11:05 UTCMay 28, 05:40 UTC18h 35m
2026-05-27 GTI8602 ORD → ICN May 27, 02:24 UTCMay 27, 09:15 UTC6h 50m
2026-05-26 GTI8603 MIA → MST May 26, 11:15 UTCMay 26, 17:25 UTC6h 10m
2026-05-25 GTI8603 MIA → MST May 25, 13:40 UTCMay 26, 09:25 UTC19h 44m
2026-05-25 GTI8602 ORD → ICN May 25, 12:15 UTCMay 26, 09:25 UTC21h 10m
2026-05-25 GTI8602 ORD → ICN May 25, 04:00 UTCMay 25, 10:35 UTC6h 35m
2026-05-24 GTI8603 MIA → MST May 24, 11:25 UTCMay 24, 17:40 UTC6h 15m
2026-05-23 GTI8603 MIA → MST May 23, 17:15 UTCMay 24, 09:05 UTC15h 51m
2026-05-23 GTI8603 MIA → MST May 23, 11:35 UTCMay 24, 09:05 UTC21h 30m
2026-05-23 GTI8602 ORD → ICN May 23, 11:20 UTCMay 24, 09:05 UTC21h 45m
2026-05-23 GTI8602 ORD → ICN May 23, 02:40 UTCMay 23, 09:20 UTC6h 40m
2026-05-21 GTI8603 MIA → MST May 21, 11:45 UTCMay 21, 18:05 UTC6h 20m
2026-05-20 GTI8603 MIA → MST May 20, 17:55 UTCMay 21, 09:30 UTC15h 35m
2026-05-20 GTI8603 MIA → MST May 20, 11:45 UTCMay 21, 09:30 UTC21h 45m
2026-05-20 GTI8602 ORD → ICN May 20, 02:50 UTCMay 20, 09:35 UTC6h 46m
2026-05-19 GTI8603 MIA → MST May 19, 11:45 UTCMay 19, 18:10 UTC6h 25m
2026-05-18 GTI8603 MIA → MST May 18, 17:25 UTCMay 19, 09:30 UTC16h 4m
2026-05-18 GTI8603 MIA → MST May 18, 11:35 UTCMay 19, 09:30 UTC21h 54m
2026-05-18 GTI8602 ORD → ICN May 18, 11:20 UTCMay 19, 09:30 UTC22h 9m
2026-05-18 GTI8602 ORD → ICN May 18, 02:10 UTCMay 18, 08:55 UTC6h 45m
2026-05-17 GTI8603 MIA → MST May 17, 13:15 UTCMay 17, 19:20 UTC6h 5m
2026-05-16 GTI8603 MIA → MST May 16, 17:55 UTCMay 17, 11:20 UTC17h 25m
2026-05-16 GTI8603 MIA → MST May 16, 11:46 UTCMay 17, 11:20 UTC23h 35m
2026-05-16 GTI8602 ORD → ICN May 16, 02:25 UTCMay 16, 09:10 UTC6h 46m
2026-05-14 GTI8603 MIA → MST May 14, 13:15 UTCMay 14, 19:35 UTC6h 20m
2026-05-13 GTI8603 MIA → MST May 13, 15:35 UTCMay 14, 11:30 UTC19h 55m
2026-05-13 GTI8603 MIA → MST May 13, 14:55 UTCMay 14, 11:30 UTC20h 35m
2026-05-13 GTI8602 ORD → ICN May 13, 04:15 UTCMay 13, 11:10 UTC6h 55m
2026-05-12 GTI8603 MIA → MST May 12, 11:45 UTCMay 12, 18:00 UTC6h 15m
2026-05-11 GTI8603 MIA → MST May 11, 17:35 UTCMay 12, 09:10 UTC15h 35m
2026-05-11 GTI8602 ORD → ICN May 11, 11:35 UTCMay 12, 09:10 UTC21h 36m
2026-05-11 GTI8602 ORD → ICN May 11, 02:25 UTCMay 11, 09:15 UTC6h 50m
2026-05-10 GTI8603 MIA → MST May 10, 14:34 UTCMay 10, 20:45 UTC6h 10m
2026-05-09 GTI8603 MIA → MST May 9, 18:05 UTCMay 10, 12:25 UTC18h 20m
2026-05-09 GTI8602 ORD → ICN May 9, 11:40 UTCMay 10, 11:30 UTC23h 50m
2026-05-09 GTI8602 ORD → ICN May 9, 02:55 UTCMay 9, 09:40 UTC6h 45m
2026-05-08 GTI812 PVG → ANC May 8, 12:44 UTCMay 8, 18:50 UTC6h 5m
2026-05-07 GTI812 PVG → ANC May 7, 17:55 UTCMay 8, 06:50 UTC12h 55m
2026-05-06 GTI8439 HNL → HKG May 6, 20:36 UTCMay 7, 12:40 UTC16h 4m
2026-05-06 GTI8439 HNL → HKG May 6, 11:35 UTCMay 6, 16:30 UTC4h 55m
2026-05-06 GTI9377 ORD → ICN May 6, 05:15 UTCMay 6, 08:01 UTC2h 45m
2026-05-01 GTI9031 MIA → LAX May 1, 08:15 UTCMay 1, 12:15 UTC4h 0m
2026-04-30 GTI8603 MIA → MST Apr 30, 11:25 UTCApr 30, 17:45 UTC6h 20m
2026-04-29 GTI8603 MIA → MST Apr 29, 17:55 UTCApr 30, 09:30 UTC15h 34m
2026-04-29 GTI8603 MIA → MST Apr 29, 11:35 UTCApr 30, 09:30 UTC21h 54m
2026-04-29 GTI8602 ORD → ICN Apr 29, 02:09 UTCApr 29, 08:55 UTC6h 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 .

Mode-S A523C6 frequently asked

What is Mode-S code A523C6?
A523C6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N430GT.
Where is Mode-S A523C6 registered?
Mode-S code A523C6 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A523C6 broadcasting right now?
Yes. Mode-S A523C6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A523C6, octal 51221706, decimal 10,822,598.
What flights does A523C6 operate?
Mode-S A523C6 has broadcast 6 distinct callsigns, including GTI8603, GTI8602, GTI8439, GTI812, GTI9377.