Apparatus

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sensors Mode-S transponder

A0C4A1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N149FE · BOEING 767-300 · operated by FEDERAL EXPRESS CORP

Hex
A0C4A1
Octal
50142241
Decimal
10,536,097
Country
US
Tail
N149FE
Type
B763
No current signal · last broadcast 7h ago
Flights observed
186
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A0C4A1.

Country allocation

The ICAO 24-bit address A0C4A1 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
FDX68 FedEx Express 4 2026-05-23
FDX67 FedEx Express 4 2026-05-22
FDX54 - 4 2026-07-04
FDX411 FedEx Express 4 2026-05-31
FDX1600 - 4 2026-07-09
FDX1220 - 4 2026-07-14
FDX258 FedEx Express 3 2026-05-19
FDX1717 FedEx Express 3 2026-04-17
FDX1542 FedEx Express 3 2026-06-04
FDX1265 - 3 2026-06-13
FDX1188 FedEx Express 3 2026-04-24
FDX904 FedEx Express 2 2026-05-16
FDX82 - 2 2026-06-25
FDX722 FedEx Express 2 2026-06-17
FDX721 - 2 2026-07-05
FDX605 FedEx Express 2 2026-06-21
FDX57 FedEx Express 2 2026-05-15
FDX529 FedEx Express 2 2026-04-14
FDX51 - 2 2026-07-04
FDX450 FedEx Express 2 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FDX1401 - Jul 14, 09:35 UTCJul 14, 10:35 UTC1h 0m
2026-07-14 FDX1220 - Jul 14, 03:10 UTCJul 14, 05:05 UTC1h 55m
2026-07-11 FDX1420 - Jul 11, 09:35 UTCJul 11, 11:30 UTC1h 55m
2026-07-10 FDX1358 - Jul 10, 02:30 UTCJul 10, 04:10 UTC1h 40m
2026-07-09 FDX798 MEM → MSP Jul 9, 21:25 UTCJul 9, 22:55 UTC1h 30m
2026-07-09 FDX404 - Jul 9, 11:45 UTCJul 9, 13:00 UTC1h 15m
2026-07-09 FDX1711 IND → DTW Jul 9, 08:40 UTCJul 9, 09:20 UTC40m
2026-07-09 FDX1600 EWR → IND Jul 9, 02:20 UTCJul 9, 03:55 UTC1h 35m
2026-07-08 FDX3901 - Jul 8, 14:30 UTCJul 8, 19:25 UTC4h 55m
2026-07-08 FDX1151 - Jul 8, 08:10 UTCJul 8, 10:40 UTC2h 30m
2026-07-08 FDX1151 AFW → LAX Jul 8, 08:10 UTCJul 8, 10:35 UTC2h 25m
2026-07-08 FDX1107 ORD → AFW Jul 8, 04:05 UTCJul 8, 05:40 UTC1h 35m
2026-07-07 FDX922 - Jul 7, 22:35 UTCJul 7, 23:45 UTC1h 10m
2026-07-07 FDX446 LAX → MEM Jul 7, 14:30 UTCJul 7, 17:50 UTC3h 20m
2026-07-07 FDX1750 - Jul 7, 08:30 UTCJul 7, 12:10 UTC3h 40m
2026-07-07 FDX1600 EWR → IND Jul 7, 02:35 UTCJul 7, 04:10 UTC1h 35m
2026-07-05 FDX721 - Jul 5, 20:45 UTCJul 5, 22:50 UTC2h 5m
2026-07-05 FDX721 MEM → EWR Jul 5, 20:39 UTCJul 5, 22:47 UTC2h 8m
2026-07-04 FDX62 - Jul 4, 13:45 UTCJul 4, 17:30 UTC3h 45m
2026-07-04 FDX51 - Jul 4, 11:40 UTCJul 4, 12:00 UTC20m
2026-07-04 FDX51 - Jul 4, 08:20 UTCJul 4, 10:10 UTC1h 50m
2026-07-04 FDX54 - Jul 4, 02:45 UTCJul 4, 05:15 UTC2h 30m
2026-07-04 FDX54 TLC → MEM Jul 4, 02:38 UTCJul 4, 05:15 UTC2h 37m
2026-07-03 FDX53 - Jul 3, 09:25 UTCJul 3, 11:40 UTC2h 15m
2026-07-03 FDX1378 - Jul 3, 02:00 UTCJul 3, 03:05 UTC1h 5m
2026-07-02 FDX1425 - Jul 2, 10:50 UTCJul 2, 11:35 UTC45m
2026-07-02 FDX1425 - Jul 2, 08:25 UTCJul 2, 09:30 UTC1h 5m
2026-07-01 FDX450 PHL → MEM Jul 1, 12:50 UTCJul 1, 14:35 UTC1h 45m
2026-07-01 FDX450 PHL → MEM Jul 1, 12:47 UTCJul 1, 14:38 UTC1h 51m
2026-07-01 FDX1439 - Jul 1, 08:50 UTCJul 1, 10:50 UTC2h 0m
2026-07-01 FDX1216 PDX → MEM Jul 1, 02:00 UTCJul 1, 05:40 UTC3h 40m
2026-06-30 FDX1857 OAK → PDX Jun 30, 10:00 UTCJun 30, 11:15 UTC1h 15m
2026-06-30 FDX1803 - Jun 30, 05:05 UTCJun 30, 06:00 UTC55m
2026-06-26 FDX1438 - Jun 26, 09:24 UTCJun 26, 12:44 UTC3h 20m
2026-06-25 FDX82 - Jun 25, 09:55 UTCJun 26, 04:14 UTC18h 20m
2026-06-25 FDX1229 SMF → MEM Jun 25, 01:54 UTCJun 25, 05:04 UTC3h 10m
2026-06-25 FDX1229 - Jun 25, 01:54 UTCJun 25, 05:09 UTC3h 15m
2026-06-24 FDX1429 - Jun 24, 08:49 UTCJun 24, 12:30 UTC3h 40m
2026-06-24 FDX1213 - Jun 24, 02:09 UTCJun 24, 05:05 UTC2h 55m
2026-06-23 FDX1417 - Jun 23, 08:25 UTCJun 23, 11:49 UTC3h 25m
2026-06-22 FDX54 - Jun 22, 10:19 UTCJun 23, 05:15 UTC18h 55m
2026-06-22 FDX54 - Jun 22, 09:19 UTCJun 23, 05:15 UTC19h 55m
2026-06-21 FDX605 MCO → MEM Jun 21, 13:09 UTCJun 21, 14:44 UTC1h 35m
2026-06-21 FDX605 MCO → MEM Jun 21, 11:30 UTCJun 21, 12:04 UTC35m
2026-06-20 FDX1400 - Jun 20, 08:44 UTCJun 20, 10:29 UTC1h 45m
2026-06-20 FDX1222 - Jun 20, 02:29 UTCJun 20, 05:24 UTC2h 55m
2026-06-19 FDX1754 IND → SAN Jun 19, 08:20 UTCJun 19, 11:54 UTC3h 35m
2026-06-19 FDX1622 - Jun 19, 02:09 UTCJun 19, 03:05 UTC55m
2026-06-18 FDX1446 - Jun 18, 08:40 UTCJun 18, 10:00 UTC1h 20m
2026-06-18 FDX2345 SDF → MEM Jun 18, 03:40 UTCJun 18, 04:30 UTC50m

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 N149FE page for operator, model, and routing details .

Mode-S A0C4A1 frequently asked

What is Mode-S code A0C4A1?
A0C4A1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N149FE.
Where is Mode-S A0C4A1 registered?
Mode-S code A0C4A1 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 A0C4A1 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0C4A1, octal 50142241, decimal 10,536,097.
What flights does A0C4A1 operate?
Mode-S A0C4A1 has broadcast 20 distinct callsigns, including FDX68, FDX67, FDX54, FDX411, FDX1600.