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 28m ago
Flights observed
101
Distinct callsigns
20
Country
US
Last broadcast
28m 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
FDX258 FedEx Express 3 2026-05-19
FDX1717 FedEx Express 3 2026-04-17
FDX1220 FedEx Express 3 2026-05-22
FDX1188 FedEx Express 3 2026-04-24
FDX904 FedEx Express 2 2026-05-16
FDX57 FedEx Express 2 2026-05-15
FDX529 FedEx Express 2 2026-04-14
FDX411 FedEx Express 2 2026-04-19
FDX3702 FedEx Express 2 2026-04-15
FDX367 FedEx Express 2 2026-05-26
FDX3605 FedEx Express 2 2026-04-15
FDX239 FedEx Express 2 2026-05-23
FDX1735 FedEx Express 2 2026-04-21
FDX1706 FedEx Express 2 2026-04-16
FDX1600 FedEx Express 2 2026-04-21
FDX1492 FedEx Express 2 2026-05-07
FDX147 FedEx Express 2 2026-05-30
FDX1444 FedEx Express 2 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 FDX1468 MEM → OAK May 30, 08:35 UTCMay 30, 12:15 UTC3h 40m
2026-05-30 FDX147 YYZ → MEM May 30, 01:50 UTCMay 30, 03:40 UTC1h 50m
2026-05-30 FDX147 YYZ → MEM May 30, 01:50 UTCMay 30, 03:46 UTC1h 56m
2026-05-29 FDX208 MEM → YYZ May 29, 21:00 UTCMay 29, 22:45 UTC1h 45m
2026-05-29 FDX5047 EWR → MEM May 29, 16:30 UTCMay 29, 18:45 UTC2h 15m
2026-05-29 FDX5046 EWR → CDG May 29, 03:35 UTCMay 29, 05:35 UTC2h 0m
2026-05-28 FDX436 ATW → MKE May 28, 13:00 UTCMay 28, 14:05 UTC1h 5m
2026-05-28 FDX1475 MEM → OMA May 28, 09:45 UTCMay 28, 10:55 UTC1h 10m
2026-05-28 FDX141 YYC → MEM May 28, 01:55 UTCMay 28, 05:10 UTC3h 15m
2026-05-27 FDX140 MEM → YYC May 27, 09:15 UTCMay 27, 12:25 UTC3h 10m
2026-05-27 FDX1273 BOS → MEM May 27, 01:59 UTCMay 27, 04:34 UTC2h 35m
2026-05-26 FDX367 MEM → MDT May 26, 20:50 UTCMay 26, 23:10 UTC2h 20m
2026-05-26 FDX825 JAX → MEM May 26, 13:15 UTCMay 26, 14:35 UTC1h 20m
2026-05-24 FDX746 MEM → MCO May 24, 21:05 UTCMay 24, 21:45 UTC40m
2026-05-23 FDX239 YVR → LAX May 23, 16:10 UTCMay 23, 20:00 UTC3h 51m
2026-05-23 FDX239 YVR → LAX May 23, 16:09 UTCMay 23, 20:02 UTC3h 53m
2026-05-23 FDX142 MEM → YVR May 23, 09:50 UTCMay 23, 13:55 UTC4h 5m
2026-05-23 FDX68 MTY → MEM May 23, 03:05 UTCMay 23, 04:50 UTC1h 45m
2026-05-22 FDX67 MEM → MTY May 22, 09:35 UTCMay 22, 11:35 UTC2h 0m
2026-05-22 FDX1220 DEN → MEM May 22, 03:15 UTCMay 22, 05:10 UTC1h 55m
2026-05-21 FDX1420 MEM → DEN May 21, 09:00 UTCMay 21, 11:00 UTC2h 0m
2026-05-21 FDX1273 BOS → MEM May 21, 02:10 UTCMay 21, 04:55 UTC2h 45m
2026-05-20 FDX367 MEM → MDT May 20, 21:10 UTCMay 20, 23:30 UTC2h 20m
2026-05-20 FDX1386 EWR → MEM May 20, 04:40 UTCMay 20, 05:35 UTC55m
2026-05-20 FDX1386 EWR → MEM May 20, 04:40 UTCMay 20, 05:34 UTC54m
2026-05-20 FDX986 MEM → MCO May 20, 01:45 UTCMay 20, 02:35 UTC50m
2026-05-19 FDX258 SDQ → MEM May 19, 09:45 UTCMay 19, 21:40 UTC11h 55m
2026-05-19 FDX1262 PHX → MEM May 19, 03:40 UTCMay 19, 06:20 UTC2h 40m
2026-05-16 FDX904 MEM → PHX May 16, 22:30 UTCMay 17, 01:20 UTC2h 50m
2026-05-16 FDX904 MEM → PHX May 16, 22:27 UTCMay 17, 01:19 UTC2h 52m
2026-05-16 FDX258 SDQ → MEM May 16, 13:25 UTCMay 16, 16:55 UTC3h 30m
2026-05-15 FDX57 MEM → BQN May 15, 08:45 UTCMay 15, 10:30 UTC1h 45m
2026-05-15 FDX57 MEM → BQN May 15, 08:45 UTCMay 15, 12:10 UTC3h 25m
2026-05-15 FDX68 MTY → MEM May 15, 02:50 UTCMay 15, 04:35 UTC1h 45m
2026-05-14 FDX67 MEM → MTY May 14, 09:40 UTCMay 14, 11:35 UTC1h 55m
2026-05-14 FDX68 MTY → MEM May 14, 02:45 UTCMay 14, 04:30 UTC1h 45m
2026-05-13 FDX67 MEM → MTY May 13, 09:30 UTCMay 13, 11:25 UTC1h 55m
2026-05-13 FDX68 MTY → MEM May 13, 02:50 UTCMay 13, 04:35 UTC1h 45m
2026-05-12 FDX67 MEM → MTY May 12, 10:05 UTCMay 12, 12:05 UTC2h 0m
2026-05-08 FDX1722 IND → PIT May 8, 08:49 UTCMay 8, 09:34 UTC45m
2026-05-08 FDX1635 CLT → IND May 8, 02:39 UTCMay 8, 03:55 UTC1h 15m
2026-05-07 FDX1492 MEM → CLT May 7, 09:20 UTCMay 7, 10:20 UTC1h 0m
2026-05-07 FDX1492 MEM → CLT May 7, 09:18 UTCMay 7, 10:20 UTC1h 2m
2026-05-07 FDX1243 CLT → MEM May 7, 03:00 UTCMay 7, 04:20 UTC1h 20m
2026-05-06 FDX1729 IND → CLT May 6, 08:20 UTCMay 6, 09:20 UTC1h 0m
2026-05-06 FDX1603 ATL → IND May 6, 03:30 UTCMay 6, 04:40 UTC1h 10m
2026-05-05 FDX1774 IND → ATL May 5, 09:45 UTCMay 5, 10:45 UTC1h 0m
2026-05-05 FDX1684 FLL → IND May 5, 02:20 UTCMay 5, 04:40 UTC2h 20m
2026-05-03 FDX789 MEM → FLL May 3, 21:05 UTCMay 3, 22:49 UTC1h 45m
2026-05-02 FDX1355 ONT → MEM May 2, 02:25 UTCMay 2, 05:20 UTC2h 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 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 28m 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, FDX258, FDX1717, FDX1220.