Apparatus

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sensors Mode-S transponder

A61C53

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N493MC · BOEING 747-400 · operated by ATLAS AIR INC

Hex
A61C53
Octal
51416123
Decimal
10,886,227
Country
US
Tail
N493MC
Type
B744
No current signal · last broadcast 2h ago
Flights observed
197
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A61C53.

Country allocation

The ICAO 24-bit address A61C53 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
GTI8523 - 8 2026-07-06
GTI8193 - 7 2026-06-15
GTI8891 - 6 2026-06-27
GTI8560 - 6 2026-06-17
GTI532 - 6 2026-06-30
GTI518 - 6 2026-06-25
GTI517 - 6 2026-06-24
GTI064 - 6 2026-07-09
GTI034 - 6 2026-07-02
GTI033 - 6 2026-07-01
GTI031 - 6 2026-04-14
GTI063 - 5 2026-07-08
GTI056 - 5 2026-04-13
GTI8790 Atlas Air 4 2026-04-21
GTI8192 - 4 2026-06-14
GTI8129 Atlas Air 4 2026-04-30
GTI8074 Atlas Air 4 2026-06-04
GTI8025 - 4 2026-07-13
GTI654 Atlas Air 4 2026-05-06
GTI032 - 4 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GTI8692 - Jul 14, 01:10 UTCJul 14, 14:25 UTC13h 15m
2026-07-13 GTI8692 - Jul 13, 13:40 UTCJul 13, 23:10 UTC9h 30m
2026-07-13 GTI8025 - Jul 13, 03:50 UTCJul 13, 04:15 UTC25m
2026-07-12 GTI8025 - Jul 12, 02:30 UTCJul 12, 05:55 UTC3h 25m
2026-07-11 GTI8025 ANC → ICN Jul 11, 16:45 UTCJul 12, 00:25 UTC7h 40m
2026-07-11 GTI8025 ANC → MEX Jul 11, 09:15 UTCJul 11, 13:45 UTC4h 30m
2026-07-10 GTI8103 - Jul 10, 22:05 UTCJul 11, 02:45 UTC4h 40m
2026-07-09 GTI064 - Jul 9, 03:45 UTCJul 9, 16:00 UTC12h 15m
2026-07-08 GTI063 - Jul 8, 15:15 UTCJul 8, 22:15 UTC7h 0m
2026-07-08 GTI792 - Jul 8, 06:25 UTCJul 8, 08:50 UTC2h 25m
2026-07-07 GTI792 - Jul 7, 21:10 UTCJul 8, 03:05 UTC5h 55m
2026-07-07 GTI792 ICN → ANC Jul 7, 04:20 UTCJul 7, 18:40 UTC14h 20m
2026-07-06 GTI9060 ORD → ICN Jul 6, 10:20 UTCJul 6, 23:55 UTC13h 35m
2026-07-06 GTI8523 - Jul 6, 01:55 UTCJul 6, 07:05 UTC5h 10m
2026-07-05 GTI8523 HKG → ANC Jul 5, 14:25 UTCJul 6, 00:00 UTC9h 35m
2026-07-05 GTI8523 - Jul 5, 10:35 UTCJul 5, 10:55 UTC20m
2026-07-05 GTI8523 - Jul 5, 09:25 UTCJul 5, 09:55 UTC30m
2026-07-05 GTI8522 - Jul 5, 05:05 UTCJul 5, 06:15 UTC1h 10m
2026-07-04 GTI9447 - Jul 4, 05:00 UTCJul 4, 05:30 UTC30m
2026-07-03 GTI9447 - Jul 3, 19:05 UTCJul 3, 21:55 UTC2h 50m
2026-07-03 CMB442 - Jul 3, 06:40 UTCJul 3, 14:35 UTC7h 55m
2026-07-03 GTI8022 - Jul 3, 01:30 UTCJul 3, 03:55 UTC2h 25m
2026-07-02 GTI034 - Jul 2, 15:50 UTCJul 2, 21:00 UTC5h 10m
2026-07-02 GTI034 - Jul 2, 12:50 UTCJul 2, 13:00 UTC10m
2026-07-01 GTI033 - Jul 1, 23:05 UTCJul 1, 23:35 UTC30m
2026-07-01 GTI033 - Jul 1, 11:30 UTCJul 1, 19:25 UTC7h 55m
2026-06-30 GTI532 ANC → MIA Jun 30, 19:00 UTCJul 1, 02:35 UTC7h 35m
2026-06-30 GTI532 ICN → ANC Jun 30, 03:25 UTCJun 30, 16:40 UTC13h 15m
2026-06-29 GTI8836 - Jun 29, 11:20 UTCJun 30, 00:45 UTC13h 25m
2026-06-29 GTI8523 - Jun 29, 03:05 UTCJun 29, 08:24 UTC5h 20m
2026-06-28 GTI8523 HKG → ANC Jun 28, 15:40 UTCJun 29, 00:54 UTC9h 15m
2026-06-28 GTI8523 - Jun 28, 12:29 UTCJun 28, 12:55 UTC25m
2026-06-28 GTI8523 - Jun 28, 11:35 UTCJun 28, 11:55 UTC20m
2026-06-28 GTI8522 - Jun 28, 05:55 UTCJun 28, 07:34 UTC1h 40m
2026-06-27 GTI8891 - Jun 27, 04:00 UTCJun 27, 04:24 UTC25m
2026-06-27 GTI8891 - Jun 27, 00:44 UTCJun 27, 01:15 UTC30m
2026-06-26 GTI8891 - Jun 26, 21:55 UTCJun 26, 22:25 UTC30m
2026-06-26 GTI8891 - Jun 26, 16:54 UTCJun 26, 19:35 UTC2h 40m
2026-06-26 GTI8891 ANC → ICN Jun 26, 06:29 UTCJun 26, 14:35 UTC8h 5m
2026-06-25 GTI8891 - Jun 25, 23:19 UTCJun 26, 03:50 UTC4h 30m
2026-06-25 GTI518 - Jun 25, 15:34 UTCJun 25, 19:59 UTC4h 25m
2026-06-24 GTI518 - Jun 24, 20:44 UTCJun 25, 13:00 UTC16h 15m
2026-06-24 GTI518 - Jun 24, 14:50 UTCJun 25, 13:00 UTC22h 10m
2026-06-24 GTI517 - Jun 24, 14:00 UTCJun 25, 12:44 UTC22h 45m
2026-06-24 GTI517 - Jun 24, 10:49 UTCJun 25, 06:55 UTC20h 5m
2026-06-24 GTI517 - Jun 24, 09:19 UTCJun 25, 06:55 UTC21h 35m
2026-06-22 GTI518 - Jun 22, 08:54 UTCJun 22, 14:14 UTC5h 20m
2026-06-21 GTI518 - Jun 21, 15:34 UTCJun 22, 06:54 UTC15h 20m
2026-06-21 GTI518 - Jun 21, 10:49 UTCJun 22, 06:54 UTC20h 5m
2026-06-21 GTI517 - Jun 21, 08:54 UTCJun 22, 06:54 UTC22h 0m

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 N493MC page for operator, model, and routing details .

Mode-S A61C53 frequently asked

What is Mode-S code A61C53?
A61C53 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N493MC.
Where is Mode-S A61C53 registered?
Mode-S code A61C53 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 A61C53 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61C53, octal 51416123, decimal 10,886,227.
What flights does A61C53 operate?
Mode-S A61C53 has broadcast 20 distinct callsigns, including GTI8523, GTI8193, GTI8891, GTI8560, GTI532.