Apparatus

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sensors Mode-S transponder

A5DC31

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N477MC · BOEING 747-400 · operated by ATLAS AIR INC

Hex
A5DC31
Octal
51356061
Decimal
10,869,809
Country
US
Tail
N477MC
Type
B744
No current signal · last broadcast Jul 26, 22:05 UTC
Flights observed
126
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:05 UTC

Last known position

Most recent position reported by Mode-S A5DC31.

Country allocation

The ICAO 24-bit address A5DC31 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
GTI8193 Atlas Air 10 2026-06-11
GTI8284 - 9 2026-07-14
GTI8523 - 7 2026-07-13
GTI863 - 6 2026-07-08
GTI862 - 5 2026-07-07
GTI8676 Atlas Air 4 2026-05-31
GTI8192 Atlas Air 4 2026-06-10
GTI9976 Atlas Air 3 2026-06-03
GTI8998 Atlas Air 3 2026-07-26
GTI856D Atlas Air 3 2026-07-23
GTI8522 - 3 2026-07-12
GTI8174 Atlas Air 3 2026-07-24
GTI8102 Atlas Air 3 2026-05-28
GTI8084 Atlas Air 3 2026-07-19
GTI6081 Atlas Air 3 2026-06-18
GTI6075 Atlas Air 3 2026-06-20
THY6092 - 2 2026-06-19
THY6075 Turkish Airlines 2 2026-06-20
GTI9462 Atlas Air 2 2026-05-30
GTI9460 Atlas Air 2 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GTI8998 CHS → HHN Jul 26, 20:35 UTCJul 26, 22:05 UTC1h 30m
2026-07-26 GTI8998 CHS → HHN Jul 26, 00:50 UTCJul 26, 18:35 UTC17h 46m
2026-07-25 GTI8998 CHS → HHN Jul 25, 20:20 UTCJul 26, 18:35 UTC22h 16m
2026-07-25 GTI8997 RMS → BWI Jul 25, 18:30 UTCJul 26, 18:15 UTC23h 46m
2026-07-25 GTI8997 RMS → BWI Jul 25, 07:55 UTCJul 25, 15:55 UTC8h 0m
2026-07-24 GTI8174 ANC → NLU Jul 24, 22:45 UTCJul 25, 02:00 UTC3h 15m
2026-07-24 GTI8174 ANC → NLU Jul 24, 12:45 UTCJul 24, 18:40 UTC5h 55m
2026-07-23 GTI8174 ANC → NLU Jul 23, 16:40 UTCJul 24, 10:55 UTC18h 15m
2026-07-23 GTI8173 LAX → PVG Jul 23, 08:20 UTCJul 24, 05:20 UTC21h 0m
2026-07-23 GTI8173 LAX → PVG Jul 23, 07:15 UTCJul 24, 05:20 UTC22h 5m
2026-07-23 GTI856D EHU → ICN Jul 23, 00:20 UTCJul 23, 04:50 UTC4h 30m
2026-07-22 GTI856D EHU → ICN Jul 22, 14:20 UTCJul 22, 21:25 UTC7h 5m
2026-07-22 GTI856D - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 GTI855D HAN → EHU Jul 22, 03:15 UTCJul 22, 03:25 UTC10m
2026-07-21 GTI8117 ORD → ICN Jul 21, 20:45 UTCJul 21, 21:30 UTC45m
2026-07-21 GTI8559 GRK → SEA Jul 21, 06:10 UTCJul 21, 18:20 UTC12h 10m
2026-07-20 GTI8500 SUU → PSM Jul 20, 13:40 UTCJul 20, 17:25 UTC3h 45m
2026-07-20 GTI8577 MST → GSP Jul 20, 04:00 UTCJul 20, 09:40 UTC5h 40m
2026-07-19 GTI8577 MST → GSP Jul 19, 17:25 UTCJul 20, 01:50 UTC8h 25m
2026-07-19 GTI8576 ICN → TPE Jul 19, 12:15 UTCJul 19, 14:25 UTC2h 10m
2026-07-19 GTI8084 NGU → PSM Jul 19, 09:20 UTCJul 19, 09:45 UTC25m
2026-07-18 GTI8084 NGU → PSM Jul 18, 23:50 UTCJul 19, 08:35 UTC8h 45m
2026-07-17 CMB591 - Jul 17, 20:29 UTCJul 18, 06:05 UTC9h 36m
2026-07-16 GTI8084 - Jul 16, 11:25 UTCJul 16, 14:40 UTC3h 15m
2026-07-16 GTI825 - Jul 16, 00:20 UTCJul 16, 07:25 UTC7h 5m
2026-07-15 GTI825 - Jul 15, 12:20 UTCJul 15, 22:05 UTC9h 45m
2026-07-14 GTI8284 - Jul 14, 23:10 UTCJul 14, 23:45 UTC35m
2026-07-14 GTI8284 - Jul 14, 15:20 UTCJul 14, 21:25 UTC6h 5m
2026-07-14 GTI8284 - Jul 14, 07:05 UTCJul 14, 10:40 UTC3h 35m
2026-07-13 GTI8284 - Jul 13, 18:00 UTCJul 14, 03:25 UTC9h 25m
2026-07-13 GTI8284 - Jul 13, 12:55 UTCJul 13, 14:50 UTC1h 55m
2026-07-13 GTI8523 ANC → ORD Jul 13, 04:25 UTCJul 13, 09:45 UTC5h 20m
2026-07-12 GTI8523 HKG → ANC Jul 12, 17:10 UTCJul 13, 02:35 UTC9h 25m
2026-07-12 GTI8523 - Jul 12, 13:01 UTCJul 12, 14:30 UTC1h 30m
2026-07-12 GTI8522 - Jul 12, 09:30 UTCJul 12, 09:40 UTC10m
2026-07-12 GTI8522 - Jul 12, 08:20 UTCJul 12, 08:30 UTC10m
2026-07-12 GTI9045 - Jul 12, 03:40 UTCJul 12, 03:55 UTC15m
2026-07-12 GTI9045 - Jul 12, 01:00 UTCJul 12, 03:05 UTC2h 5m
2026-07-11 GTI8898 - Jul 11, 22:25 UTCJul 11, 23:00 UTC35m
2026-07-11 GTI894 - Jul 11, 03:15 UTCJul 11, 23:00 UTC19h 45m
2026-07-10 GTI892 ICN → NRT Jul 10, 16:00 UTCJul 11, 00:35 UTC8h 35m
2026-07-09 GTI890 - Jul 9, 08:10 UTCJul 9, 22:30 UTC14h 20m
2026-07-08 GTI891 - Jul 8, 20:45 UTCJul 9, 04:25 UTC7h 40m
2026-07-08 GTI863 - Jul 8, 00:05 UTCJul 8, 14:00 UTC13h 55m
2026-07-07 GTI863 - Jul 7, 17:40 UTCJul 8, 14:00 UTC20h 20m
2026-07-07 GTI863 - Jul 7, 14:55 UTCJul 8, 14:00 UTC23h 5m
2026-07-07 GTI862 - Jul 7, 10:20 UTCJul 8, 10:15 UTC23h 55m
2026-07-07 GTI862 - Jul 7, 08:30 UTCJul 8, 00:20 UTC15h 50m
2026-07-06 GTI862 - Jul 6, 09:15 UTCJul 6, 17:00 UTC7h 45m
2026-07-05 GTI604 - Jul 5, 19:25 UTCJul 6, 04:20 UTC8h 55m

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 N477MC page for operator, model, and routing details .

Mode-S A5DC31 frequently asked

What is Mode-S code A5DC31?
A5DC31 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N477MC.
Where is Mode-S A5DC31 registered?
Mode-S code A5DC31 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 A5DC31 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5DC31, octal 51356061, decimal 10,869,809.
What flights does A5DC31 operate?
Mode-S A5DC31 has broadcast 20 distinct callsigns, including GTI8193, GTI8284, GTI8523, GTI863, GTI862.