Apparatus

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sensors Mode-S transponder

A5C99E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N472MC · BOEING 747-400 · operated by ATLAS AIR INC

Hex
A5C99E
Octal
51344636
Decimal
10,865,054
Country
US
Tail
N472MC
Type
B744
No current signal · last broadcast 6d ago
Flights observed
84
Distinct callsigns
20
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A5C99E.

Country allocation

The ICAO 24-bit address A5C99E 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
GTI512 - 13 2026-06-30
GTI8290 - 9 2026-07-02
GTI8296 - 5 2026-07-05
GTI8874 - 4 2026-06-16
GTI8816 - 4 2026-06-28
GTI8815 - 4 2026-06-25
GTI8582 Atlas Air 4 2026-05-31
GTI9811 - 3 2026-06-22
GTI8523 Atlas Air 3 2026-06-09
GTI8193 - 3 2026-07-07
GTI654 Atlas Air 3 2026-06-05
GTI9447 Atlas Air 2 2026-06-04
GTI9372 Atlas Air 2 2026-05-22
GTI8754 Atlas Air 2 2026-06-06
GTI8700 Atlas Air 2 2026-06-03
GTI8692 Atlas Air 2 2026-06-02
GTI8537 - 2 2026-06-28
GTI8522 Atlas Air 2 2026-06-10
GTI8422 - 2 2026-07-04
GTI8174 Atlas Air 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-07 GTI8193 ANC → ORD Jul 7, 06:35 UTCJul 7, 12:00 UTC5h 25m
2026-07-06 GTI8193 - Jul 6, 21:05 UTCJul 7, 04:35 UTC7h 30m
2026-07-06 GTI8193 ICN → ICN Jul 6, 11:00 UTCJul 6, 19:10 UTC8h 10m
2026-07-05 GTI8296 - Jul 5, 23:20 UTCJul 5, 23:45 UTC25m
2026-07-05 GTI8296 - Jul 5, 15:20 UTCJul 5, 22:40 UTC7h 20m
2026-07-05 GTI8296 - Jul 5, 06:20 UTCJul 5, 10:10 UTC3h 50m
2026-07-04 GTI8296 - Jul 4, 19:00 UTCJul 5, 03:40 UTC8h 40m
2026-07-04 GTI8296 - Jul 4, 12:35 UTCJul 4, 14:35 UTC2h 0m
2026-07-04 GTI8422 ANC → MIA Jul 4, 02:50 UTCJul 4, 10:20 UTC7h 30m
2026-07-03 GTI8422 - Jul 3, 16:40 UTCJul 4, 00:00 UTC7h 20m
2026-07-02 GTI8421 - Jul 2, 16:50 UTCJul 2, 17:30 UTC40m
2026-07-02 GTI8290 - Jul 2, 14:20 UTCJul 2, 14:45 UTC25m
2026-07-01 GTI8290 - Jul 1, 20:55 UTCJul 2, 13:35 UTC16h 40m
2026-07-01 GTI8290 - Jul 1, 08:30 UTCJul 1, 17:25 UTC8h 55m
2026-07-01 GTI8290 - Jul 1, 03:05 UTCJul 1, 05:15 UTC2h 10m
2026-06-30 GTI512 - Jun 30, 07:15 UTCJun 30, 14:35 UTC7h 20m
2026-06-29 GTI512 ICN → ANC Jun 29, 16:29 UTCJun 30, 05:15 UTC12h 46m
2026-06-28 GTI8537 - Jun 28, 18:59 UTCJun 29, 04:30 UTC9h 30m
2026-06-28 GTI8537 - Jun 28, 11:29 UTCJun 28, 16:29 UTC5h 0m
2026-06-28 GTI8816 - Jun 28, 04:20 UTCJun 28, 05:20 UTC1h 0m
2026-06-27 GTI8816 EDF → SUU Jun 27, 21:55 UTCJun 28, 01:25 UTC3h 30m
2026-06-27 GTI8816 OSN → EDF Jun 27, 11:00 UTCJun 27, 18:09 UTC7h 10m
2026-06-27 GTI8816 - Jun 27, 06:35 UTCJun 27, 07:04 UTC30m
2026-06-25 GTI8815 - Jun 25, 10:50 UTCJun 25, 10:59 UTC10m
2026-06-25 GTI8815 - Jun 25, 06:20 UTCJun 25, 06:40 UTC20m
2026-06-25 GTI8815 - Jun 25, 01:40 UTCJun 25, 02:10 UTC30m
2026-06-24 GTI8815 - Jun 24, 20:54 UTCJun 24, 21:54 UTC1h 0m
2026-06-23 GTI512 - Jun 23, 18:29 UTCJun 23, 21:39 UTC3h 10m
2026-06-23 GTI512 - Jun 23, 09:24 UTCJun 23, 15:50 UTC6h 25m
2026-06-22 GTI512 - Jun 22, 16:54 UTCJun 23, 05:59 UTC13h 5m
2026-06-22 GTI9811 - Jun 22, 01:44 UTCJun 22, 14:05 UTC12h 20m
2026-06-21 GTI9811 - Jun 21, 20:34 UTCJun 21, 21:54 UTC1h 20m
2026-06-21 GTI9811 - Jun 21, 18:54 UTCJun 21, 19:05 UTC10m
2026-06-21 GTI792 PVG → ANC Jun 21, 09:29 UTCJun 21, 16:14 UTC6h 45m
2026-06-20 GTI792 PVG → ANC Jun 20, 17:29 UTCJun 21, 07:34 UTC14h 5m
2026-06-20 GTI811 JFK → ICN Jun 20, 01:29 UTCJun 20, 15:29 UTC14h 0m
2026-06-19 GTI812 ANC → JFK Jun 19, 15:29 UTCJun 19, 21:59 UTC6h 30m
2026-06-19 GTI812 ICN → ANC Jun 19, 00:49 UTCJun 19, 13:50 UTC13h 0m
2026-06-18 GTI8290 - Jun 18, 22:00 UTCJun 18, 22:20 UTC20m
2026-06-18 GTI8290 - Jun 18, 04:00 UTCJun 18, 14:45 UTC10h 45m
2026-06-17 GTI8290 - Jun 17, 18:20 UTCJun 18, 00:20 UTC6h 0m
2026-06-17 GTI8290 - Jun 17, 16:00 UTCJun 17, 18:15 UTC2h 15m
2026-06-17 GTI8290 - Jun 17, 10:50 UTCJun 17, 13:15 UTC2h 25m
2026-06-17 GTI532 ANC → LAX Jun 17, 00:20 UTCJun 17, 07:00 UTC6h 40m
2026-06-16 GTI532 ANC → LAX Jun 16, 09:45 UTCJun 16, 22:05 UTC12h 21m
2026-06-16 GTI8874 - Jun 16, 07:40 UTCJun 16, 08:05 UTC25m
2026-06-15 GTI8874 - Jun 15, 22:59 UTCJun 15, 23:30 UTC30m
2026-06-15 GTI8874 - Jun 15, 13:20 UTCJun 15, 16:49 UTC3h 30m
2026-06-14 GTI8874 - Jun 14, 13:40 UTCJun 14, 22:10 UTC8h 30m
2026-06-14 GTI512 - Jun 14, 08:20 UTCJun 14, 09:50 UTC1h 30m

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 N472MC page for operator, model, and routing details .

Mode-S A5C99E frequently asked

What is Mode-S code A5C99E?
A5C99E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N472MC.
Where is Mode-S A5C99E registered?
Mode-S code A5C99E 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 A5C99E broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5C99E, octal 51344636, decimal 10,865,054.
What flights does A5C99E operate?
Mode-S A5C99E has broadcast 20 distinct callsigns, including GTI512, GTI8290, GTI8296, GTI8874, GTI8816.