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sensors Mode-S transponder

A2C4B6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N278FE · BOEING 767-300 · operated by FEDERAL EXPRESS CORP

Hex
A2C4B6
Octal
50542266
Decimal
10,667,190
Country
US
Tail
N278FE
Type
B763
No current signal · last broadcast Jul 25, 12:10 UTC
Flights observed
212
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 12:10 UTC

Last known position

Most recent position reported by Mode-S A2C4B6.

Country allocation

The ICAO 24-bit address A2C4B6 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
FDX1654 - 7 2026-07-16
FDX1537 FedEx Express 6 2026-07-25
FDX1422 - 5 2026-07-15
FDX58 - 4 2026-06-25
FDX257 - 4 2026-06-24
FDX1717 FedEx Express 4 2026-07-17
FDX1455 - 4 2026-06-30
FDX1359 FedEx Express 4 2026-05-27
FDX668 - 3 2026-06-28
FDX3954 - 3 2026-06-27
FDX3724 FedEx Express 3 2026-04-14
FDX3629 FedEx Express 3 2026-06-20
FDX1865 FedEx Express 3 2026-06-04
FDX1754 - 3 2026-07-09
FDX1700 - 3 2026-06-26
FDX1530 FedEx Express 3 2026-05-23
FDX1497 FedEx Express 3 2026-04-21
FDX1414 FedEx Express 3 2026-05-27
FDX1344 FedEx Express 3 2026-05-28
FDX1265 FedEx Express 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 FDX1537 MEM → HRL Jul 25, 11:35 UTCJul 25, 12:10 UTC35m
2026-07-25 FDX1537 MEM → HRL Jul 25, 09:25 UTCJul 25, 10:30 UTC1h 5m
2026-07-25 FDX1301 SFO → MEM Jul 25, 01:55 UTCJul 25, 05:20 UTC3h 25m
2026-07-24 FDX1545 MEM → SFO Jul 24, 08:20 UTCJul 24, 12:00 UTC3h 40m
2026-07-24 FDX1265 HRL → MEM Jul 24, 01:40 UTCJul 24, 03:15 UTC1h 35m
2026-07-23 FDX1537 MEM → HRL Jul 23, 09:40 UTCJul 23, 11:10 UTC1h 30m
2026-07-23 FDX1247 ORD → MEM Jul 23, 04:10 UTCJul 23, 05:15 UTC1h 5m
2026-07-22 FDX1627 ORD → IND Jul 22, 04:35 UTCJul 22, 05:10 UTC35m
2026-07-21 FDX1706 IND → ORD Jul 21, 09:30 UTCJul 21, 10:05 UTC35m
2026-07-21 FDX2638 RDU → LCK Jul 21, 05:00 UTCJul 21, 06:15 UTC1h 15m
2026-07-21 FDX2638 RDU → LCK Jul 21, 04:57 UTCJul 21, 06:10 UTC1h 13m
2026-07-19 FDX785 MEM → RDU Jul 19, 21:50 UTCJul 19, 23:20 UTC1h 30m
2026-07-18 FDX630 SEA → MEM Jul 18, 11:50 UTCJul 18, 15:35 UTC3h 45m
2026-07-18 FDX630 - Jul 18, 11:50 UTCJul 18, 15:25 UTC3h 35m
2026-07-17 FDX1717 IND → SEA Jul 17, 08:10 UTCJul 17, 12:04 UTC3h 55m
2026-07-17 FDX1717 IND → SEA Jul 17, 08:05 UTCJul 17, 12:01 UTC3h 56m
2026-07-17 FDX1608 STL → IND Jul 17, 04:03 UTCJul 17, 04:39 UTC36m
2026-07-17 FDX1608 STL → IND Jul 17, 04:04 UTCJul 17, 04:39 UTC35m
2026-07-16 FDX1708 - Jul 16, 09:05 UTCJul 16, 09:40 UTC35m
2026-07-16 FDX1654 - Jul 16, 02:30 UTCJul 16, 06:10 UTC3h 40m
2026-07-15 FDX1422 - Jul 15, 09:10 UTCJul 15, 12:10 UTC3h 0m
2026-07-15 FDX2210 - Jul 15, 02:15 UTCJul 15, 03:45 UTC1h 30m
2026-07-14 FDX762 - Jul 14, 21:30 UTCJul 14, 22:55 UTC1h 24m
2026-07-14 FDX762 MEM → TPA Jul 14, 21:26 UTCJul 14, 22:49 UTC1h 23m
2026-07-14 FDX864 ATL → MEM Jul 14, 13:45 UTCJul 14, 17:20 UTC3h 35m
2026-07-12 FDX983 - Jul 12, 23:55 UTCJul 13, 03:25 UTC3h 30m
2026-07-11 FDX1212 - Jul 11, 00:55 UTCJul 11, 03:30 UTC2h 35m
2026-07-10 FDX1412 - Jul 10, 08:20 UTCJul 10, 10:30 UTC2h 10m
2026-07-10 FDX1222 - Jul 10, 02:20 UTCJul 10, 05:30 UTC3h 10m
2026-07-09 FDX1754 - Jul 9, 08:40 UTCJul 9, 11:30 UTC2h 50m
2026-07-09 FDX1754 IND → SAN Jul 9, 08:40 UTCJul 9, 12:12 UTC3h 32m
2026-07-09 FDX2629 TPA → IND Jul 9, 02:15 UTCJul 9, 03:55 UTC1h 40m
2026-07-08 FDX1759 IND → TPA Jul 8, 08:25 UTCJul 8, 10:10 UTC1h 45m
2026-07-08 FDX1625 - Jul 8, 02:10 UTCJul 8, 04:35 UTC2h 25m
2026-07-07 FDX1188 - Jul 7, 10:00 UTCJul 7, 10:50 UTC50m
2026-07-07 FDX1188 - Jul 7, 08:20 UTCJul 7, 09:05 UTC45m
2026-07-07 FDX1124 ATL → AFW Jul 7, 03:20 UTCJul 7, 05:00 UTC1h 40m
2026-07-03 FDX1421 - Jul 3, 07:45 UTCJul 3, 08:35 UTC50m
2026-07-02 FDX1265 - Jul 2, 01:55 UTCJul 2, 03:45 UTC1h 50m
2026-07-01 FDX1537 - Jul 1, 10:10 UTCJul 1, 11:35 UTC1h 25m
2026-07-01 FDX1537 MEM → HRL Jul 1, 10:05 UTCJul 1, 11:39 UTC1h 34m
2026-07-01 FDX1226 - Jul 1, 01:45 UTCJul 1, 03:05 UTC1h 20m
2026-06-30 FDX1455 - Jun 30, 09:40 UTCJun 30, 10:50 UTC1h 10m
2026-06-30 FDX1455 MEM → JAX Jun 30, 09:35 UTCJun 30, 10:50 UTC1h 15m
2026-06-30 FDX1314 - Jun 30, 03:15 UTCJun 30, 05:15 UTC2h 0m
2026-06-28 FDX192 - Jun 28, 21:20 UTCJun 28, 23:20 UTC2h 0m
2026-06-28 FDX668 - Jun 28, 12:25 UTCJun 28, 16:09 UTC3h 45m
2026-06-27 FDX3954 EWR → SEA Jun 27, 18:45 UTCJun 28, 00:09 UTC5h 25m
2026-06-26 FDX1700 IND → EWR Jun 26, 08:25 UTCJun 26, 09:45 UTC1h 20m
2026-06-26 FDX1700 IND → EWR Jun 26, 08:30 UTCJun 26, 09:50 UTC1h 20m

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 N278FE page for operator, model, and routing details .

Mode-S A2C4B6 frequently asked

What is Mode-S code A2C4B6?
A2C4B6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N278FE.
Where is Mode-S A2C4B6 registered?
Mode-S code A2C4B6 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 A2C4B6 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 12:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C4B6, octal 50542266, decimal 10,667,190.
What flights does A2C4B6 operate?
Mode-S A2C4B6 has broadcast 20 distinct callsigns, including FDX1654, FDX1537, FDX1422, FDX58, FDX257.