Apparatus

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sensors Mode-S transponder

A5CD55

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N473MC · BOEING 747-400 · operated by ATLAS AIR INC

Hex
A5CD55
Octal
51346525
Decimal
10,866,005
Country
US
Tail
N473MC
Type
B744
No current signal · last broadcast Jul 26, 19:45 UTC
Flights observed
155
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:45 UTC

Last known position

Most recent position reported by Mode-S A5CD55.

Country allocation

The ICAO 24-bit address A5CD55 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
GTI8815 Atlas Air 21 2026-07-23
GTI8816 Atlas Air 20 2026-07-25
GTI8811 Atlas Air 14 2026-05-07
GTI512 Atlas Air 14 2026-07-21
GTI8817 Atlas Air 12 2026-05-09
GTI8812 Atlas Air 12 2026-05-07
GTI8818 Atlas Air 10 2026-07-19
GTI654 - 6 2026-06-29
GTI8537 Atlas Air 5 2026-07-26
GTI8520 Atlas Air 4 2026-05-19
GTI8284 - 4 2026-07-01
GTI8860 Atlas Air 3 2026-05-03
GTI8193 Atlas Air 3 2026-05-12
GTI9449 Atlas Air 2 2026-05-16
GTI8916 - 2 2026-06-26
GTI8692 Atlas Air 2 2026-04-21
GTI8516 Atlas Air 2 2026-05-15
GTI8373 Atlas Air 2 2026-05-18
GTI8137 Atlas Air 2 2026-05-16
GTI8092 Atlas Air 2 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GTI8537 HNL → SYD Jul 26, 19:30 UTCJul 26, 19:45 UTC15m
2026-07-26 GTI8537 HNL → SYD Jul 26, 11:35 UTCJul 26, 16:45 UTC5h 10m
2026-07-25 GTI8816 SUU → LAX Jul 25, 07:50 UTCJul 25, 08:50 UTC1h 0m
2026-07-24 GTI8816 SUU → LAX Jul 24, 23:45 UTCJul 25, 04:05 UTC4h 20m
2026-07-24 GTI8816 SUU → LAX Jul 24, 11:55 UTCJul 24, 20:20 UTC8h 25m
2026-07-24 GTI8816 SUU → LAX Jul 24, 06:25 UTCJul 24, 08:10 UTC1h 45m
2026-07-23 GTI8815 HHN → NGU Jul 23, 12:30 UTCJul 24, 03:50 UTC15h 20m
2026-07-23 GTI8815 HHN → NGU Jul 23, 02:20 UTCJul 23, 07:45 UTC5h 25m
2026-07-22 GTI8815 - Jul 22, 20:00 UTCJul 22, 21:00 UTC1h 0m
2026-07-21 GTI512 ANC → ORD Jul 21, 17:30 UTCJul 21, 20:35 UTC3h 5m
2026-07-21 GTI512 ANC → ORD Jul 21, 14:35 UTCJul 21, 14:45 UTC10m
2026-07-21 GTI512 ANC → ORD Jul 21, 07:45 UTCJul 21, 13:55 UTC6h 10m
2026-07-20 GTI512 ANC → ORD Jul 20, 16:20 UTCJul 21, 05:20 UTC12h 59m
2026-07-19 GTI8818 UAM → HNL Jul 19, 00:30 UTCJul 19, 11:50 UTC11h 20m
2026-07-18 GTI8816 EDF → SUU Jul 18, 17:15 UTCJul 18, 21:05 UTC3h 50m
2026-07-18 GTI8816 - Jul 18, 04:20 UTCJul 18, 12:10 UTC7h 50m
2026-07-17 GTI8816 - Jul 17, 10:00 UTCJul 17, 10:40 UTC40m
2026-07-17 GTI8816 - Jul 17, 08:59 UTCJul 17, 09:15 UTC15m
2026-07-17 GTI8815 - Jul 17, 01:45 UTCJul 17, 01:55 UTC10m
2026-07-16 GTI8815 - Jul 16, 11:20 UTCJul 16, 11:45 UTC25m
2026-07-16 GTI8815 - Jul 16, 06:30 UTCJul 16, 06:55 UTC25m
2026-07-16 GTI8815 - Jul 16, 01:45 UTCJul 16, 02:20 UTC35m
2026-07-15 GTI8815 - Jul 15, 20:10 UTCJul 15, 21:05 UTC55m
2026-07-15 GTI512 - Jul 15, 08:40 UTCJul 15, 11:55 UTC3h 15m
2026-07-14 GTI512 - Jul 14, 23:00 UTCJul 15, 05:50 UTC6h 50m
2026-07-14 GTI512 ICN → ANC Jul 14, 07:30 UTCJul 14, 20:40 UTC13h 10m
2026-07-13 GTI8537 - Jul 13, 19:30 UTCJul 14, 04:50 UTC9h 20m
2026-07-13 GTI8537 - Jul 13, 16:25 UTCJul 13, 16:50 UTC25m
2026-07-13 GTI8537 - Jul 13, 12:00 UTCJul 13, 12:25 UTC25m
2026-07-13 GTI8816 - Jul 13, 07:25 UTCJul 13, 08:25 UTC1h 0m
2026-07-13 GTI8816 EDF → SUU Jul 13, 00:55 UTCJul 13, 04:50 UTC3h 55m
2026-07-12 GTI8816 - Jul 12, 14:35 UTCJul 12, 21:25 UTC6h 50m
2026-07-12 GTI8816 - Jul 12, 13:15 UTCJul 12, 13:25 UTC10m
2026-07-12 GTI8816 OSN → DNA Jul 12, 06:50 UTCJul 12, 08:30 UTC1h 40m
2026-07-10 GTI8815 HNL → OSN Jul 10, 14:25 UTCJul 11, 07:15 UTC16h 51m
2026-07-10 GTI8815 - Jul 10, 06:40 UTCJul 10, 11:45 UTC5h 5m
2026-07-10 GTI8815 LAX → SUU Jul 10, 02:05 UTCJul 10, 03:05 UTC1h 0m
2026-07-08 GTI512 - Jul 8, 07:40 UTCJul 8, 10:50 UTC3h 10m
2026-07-07 GTI512 - Jul 7, 21:50 UTCJul 8, 03:45 UTC5h 55m
2026-07-07 GTI512 ICN → ANC Jul 7, 06:10 UTCJul 7, 19:30 UTC13h 20m
2026-07-06 GTI511 - Jul 6, 15:40 UTCJul 7, 04:00 UTC12h 20m
2026-07-06 GTI512 - Jul 6, 09:50 UTCJul 6, 13:05 UTC3h 15m
2026-07-06 GTI512 - Jul 6, 05:45 UTCJul 6, 05:55 UTC10m
2026-07-05 GTI512 - Jul 5, 23:05 UTCJul 6, 05:05 UTC6h 0m
2026-07-05 GTI512 - Jul 5, 12:30 UTCJul 5, 19:50 UTC7h 20m
2026-07-01 GTI511 - Jul 1, 19:25 UTCJul 1, 19:50 UTC25m
2026-07-01 GTI8284 - Jul 1, 00:05 UTCJul 1, 00:25 UTC20m
2026-06-30 GTI8284 - Jun 30, 06:30 UTCJun 30, 23:20 UTC16h 50m
2026-06-29 GTI8284 - Jun 29, 18:14 UTCJun 30, 02:55 UTC8h 41m
2026-06-29 GTI8284 - Jun 29, 12:24 UTCJun 29, 14:34 UTC2h 10m

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 N473MC page for operator, model, and routing details .

Mode-S A5CD55 frequently asked

What is Mode-S code A5CD55?
A5CD55 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N473MC.
Where is Mode-S A5CD55 registered?
Mode-S code A5CD55 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 A5CD55 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5CD55, octal 51346525, decimal 10,866,005.
What flights does A5CD55 operate?
Mode-S A5CD55 has broadcast 20 distinct callsigns, including GTI8815, GTI8816, GTI8811, GTI512, GTI8817.