sensors Mode-S transponder

A4F6A5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N419MC · BOEING 747-400 · operated by ATLAS AIR INC

Hex
A4F6A5
Octal
51173245
Decimal
10,811,045
Country
US
Tail
N419MC
Type
B744
No current signal · last broadcast 10d ago
Flights observed
65
Distinct callsigns
20
Country
US
Last broadcast
10d ago

Last known position

Most recent position reported by Mode-S A4F6A5.

Country allocation

The ICAO 24-bit address A4F6A5 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
GTI8174 Atlas Air 9 2026-04-15
GTI8961 - 5 2026-04-13
GTI8102 Atlas Air 4 2026-04-29
GTI8439 Atlas Air 3 2026-04-23
GTI8312 Atlas Air 3 2026-04-27
GTI8282 Atlas Air 3 2026-05-06
GTI8120 Atlas Air 3 2026-05-11
GTI512 Atlas Air 3 2026-04-23
GTI9919 Atlas Air 2 2026-05-18
GTI9893 Atlas Air 2 2026-05-16
GTI9681 Atlas Air 2 2026-04-30
GTI8860 Atlas Air 2 2026-05-17
GTI8535 Atlas Air 2 2026-05-19
GTI8422 Atlas Air 2 2026-04-25
GTI8311 Atlas Air 2 2026-05-15
GTI8173 - 2 2026-04-13
GTI8154 Atlas Air 2 2026-05-03
GTI8153 Atlas Air 2 2026-05-02
GTI8139 Atlas Air 2 2026-05-16
GTI812 Atlas Air 2 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-19 GTI8535 PSM → AEX May 19, 10:10 UTCMay 19, 22:50 UTC12h 40m
2026-05-18 GTI8535 PSM → AEX May 18, 21:25 UTCMay 19, 02:20 UTC4h 55m
2026-05-18 GTI9919 ORD → OKO May 18, 03:30 UTCMay 18, 04:00 UTC30m
2026-05-17 GTI9919 ORD → OKO May 17, 16:01 UTCMay 17, 23:00 UTC7h 0m
2026-05-17 GTI8860 FOE → HHN May 17, 07:30 UTCMay 17, 12:55 UTC5h 25m
2026-05-16 GTI8860 FOE → HHN May 16, 21:20 UTCMay 17, 05:05 UTC7h 45m
2026-05-16 GTI8140 DEL → HKG May 16, 12:16 UTCMay 16, 18:50 UTC6h 35m
2026-05-16 GTI8139 HKG → DEL May 16, 07:05 UTCMay 16, 09:51 UTC2h 45m
2026-05-16 GTI8139 HKG → DEL May 16, 04:45 UTCMay 16, 04:55 UTC10m
2026-05-16 GTI9893 NKW → HKG May 16, 01:10 UTCMay 16, 01:30 UTC20m
2026-05-15 GTI9893 NKW → HKG May 15, 10:55 UTCMay 15, 23:10 UTC12h 14m
2026-05-15 GTI8311 HHN → PSM May 15, 05:40 UTCMay 15, 05:50 UTC10m
2026-05-14 GTI8311 HHN → PSM May 14, 23:30 UTCMay 15, 04:35 UTC5h 5m
2026-05-13 GTI9892 ORD → OKO May 13, 00:55 UTCMay 13, 13:31 UTC12h 35m
2026-05-11 GTI8120 HOP → HHN May 11, 18:10 UTCMay 11, 22:35 UTC4h 24m
2026-05-11 GTI8120 HOP → HHN May 11, 08:30 UTCMay 11, 15:40 UTC7h 10m
2026-05-10 GTI8120 HOP → HHN May 10, 18:25 UTCMay 11, 15:40 UTC21h 15m
2026-05-08 GTI8570 HKG → GYD May 8, 20:20 UTCMay 9, 11:25 UTC15h 5m
2026-05-07 GTI792 PVG → ANC May 7, 18:15 UTCMay 8, 00:40 UTC6h 24m
2026-05-07 GTI792 PVG → ANC May 7, 02:20 UTCMay 7, 16:10 UTC13h 50m
2026-05-06 GTI8282 PSM → HHN May 6, 19:40 UTCMay 6, 19:55 UTC15m
2026-05-06 GTI8282 PSM → HHN May 6, 01:50 UTCMay 6, 18:50 UTC16h 59m
2026-05-05 GTI8282 PSM → HHN May 5, 14:50 UTCMay 5, 23:35 UTC8h 45m
2026-05-04 GTI811 LAX → ICN May 4, 15:50 UTCMay 4, 18:40 UTC2h 51m
2026-05-04 GTI812 PVG → ANC May 4, 08:15 UTCMay 4, 13:30 UTC5h 15m
2026-05-03 GTI812 PVG → ANC May 3, 16:20 UTCMay 4, 05:35 UTC13h 15m
2026-05-03 GTI8154 AMS → ORD May 3, 07:40 UTCMay 3, 07:55 UTC15m
2026-05-02 GTI8154 AMS → ORD May 2, 20:00 UTCMay 3, 06:40 UTC10h 39m
2026-05-02 GTI8153 CKG → AMS May 2, 08:15 UTCMay 2, 12:45 UTC4h 30m
2026-05-01 GTI8153 CKG → AMS May 1, 15:30 UTCMay 2, 12:45 UTC21h 16m
2026-04-30 GTI9681 MIA → ANC Apr 30, 12:45 UTCApr 30, 21:25 UTC8h 40m
2026-04-30 GTI9681 MIA → ANC Apr 30, 02:40 UTCApr 30, 11:00 UTC8h 20m
2026-04-29 GTI8102 DFW → ORD Apr 29, 04:00 UTCApr 29, 12:40 UTC8h 41m
2026-04-28 GTI8102 DFW → ORD Apr 28, 19:15 UTCApr 29, 00:59 UTC5h 45m
2026-04-28 GTI8102 DFW → ORD Apr 28, 11:50 UTCApr 28, 17:25 UTC5h 35m
2026-04-27 GTI8102 DFW → ORD Apr 27, 19:55 UTCApr 28, 09:55 UTC14h 0m
2026-04-27 GTI8312 DOV → RMS Apr 27, 16:40 UTCApr 27, 17:00 UTC20m
2026-04-27 GTI8312 DOV → RMS Apr 27, 07:10 UTCApr 27, 16:00 UTC8h 50m
2026-04-26 CMB382 - Apr 26, 18:20 UTCApr 27, 03:00 UTC8h 40m
2026-04-26 GTI8312 DOV → RMS Apr 26, 08:45 UTCApr 26, 10:40 UTC1h 55m
2026-04-25 GTI8422 ANC → MIA Apr 25, 19:10 UTCApr 26, 02:25 UTC7h 15m
2026-04-24 GTI8422 ANC → MIA Apr 24, 08:20 UTCApr 24, 20:25 UTC12h 5m
2026-04-23 GTI8439 HNL → HKG Apr 23, 15:00 UTCApr 24, 06:35 UTC15h 35m
2026-04-23 GTI8439 HNL → HKG Apr 23, 11:50 UTCApr 23, 12:15 UTC25m
2026-04-23 GTI8439 HNL → HKG Apr 23, 06:50 UTCApr 23, 07:45 UTC55m
2026-04-23 GTI512 ANC → ORD Apr 23, 00:25 UTCApr 23, 04:05 UTC3h 40m
2026-04-22 GTI512 ANC → ORD Apr 22, 13:25 UTCApr 22, 18:30 UTC5h 5m
2026-04-21 GTI512 ANC → ORD Apr 21, 21:40 UTCApr 22, 10:45 UTC13h 5m
2026-04-21 GTI9038 ORD → ICN Apr 21, 05:30 UTCApr 21, 19:35 UTC14h 5m
2026-04-15 GTI8174 ANC → NLU Apr 15, 07:01 UTCApr 15, 08:10 UTC1h 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 N419MC page for operator, model, and routing details .

Mode-S A4F6A5 frequently asked

What is Mode-S code A4F6A5?
A4F6A5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N419MC.
Where is Mode-S A4F6A5 registered?
Mode-S code A4F6A5 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 A4F6A5 broadcasting right now?
No active broadcast right now. Last signal was 10d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F6A5, octal 51173245, decimal 10,811,045.
What flights does A4F6A5 operate?
Mode-S A4F6A5 has broadcast 20 distinct callsigns, including GTI8174, GTI8961, GTI8102, GTI8439, GTI8312.