Apparatus

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sensors Mode-S transponder

A68D27

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N521FE · MCDONNELL-DOUGLAS MD-11 · operated by FEDERAL EXPRESS CORP

Hex
A68D27
Octal
51506447
Decimal
10,915,111
Country
US
Tail
N521FE
Type
MD11
No current signal · last broadcast 1h ago
Flights observed
57
Distinct callsigns
13
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A68D27.

Country allocation

The ICAO 24-bit address A68D27 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 13 distinct

Callsign Airline Flights Last seen
FDX1514 FedEx Express 8 2026-05-28
FDX1202 FedEx Express 8 2026-05-28
FDX104 FedEx Express 8 2026-05-21
FDX619 FedEx Express 6 2026-05-21
FDX910 FedEx Express 5 2026-05-20
FDX721 FedEx Express 4 2026-05-24
FDX604 FedEx Express 4 2026-05-23
FDX637 FedEx Express 3 2026-05-28
FDX105 FedEx Express 3 2026-05-21
FDX980 FedEx Express 2 2026-05-11
FDX9045 FedEx Express 2 2026-05-10
FDX743 FedEx Express 2 2026-05-27
FDX1234 FedEx Express 2 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 FDX637 EWR → MEM May 28, 13:25 UTCMay 28, 15:35 UTC2h 10m
2026-05-28 FDX1514 MEM → EWR May 28, 08:55 UTCMay 28, 10:40 UTC1h 45m
2026-05-28 FDX1202 EWR → MEM May 28, 02:30 UTCMay 28, 04:45 UTC2h 15m
2026-05-27 FDX743 MEM → EWR May 27, 22:30 UTCMay 28, 00:30 UTC2h 0m
2026-05-27 FDX743 MEM → EWR May 27, 22:25 UTCMay 28, 00:28 UTC2h 3m
2026-05-27 FDX637 EWR → MEM May 27, 13:45 UTCMay 27, 15:55 UTC2h 10m
2026-05-27 FDX1514 MEM → EWR May 27, 09:10 UTCMay 27, 11:05 UTC1h 55m
2026-05-27 FDX1514 MEM → EWR May 27, 09:09 UTCMay 27, 11:05 UTC1h 56m
2026-05-27 FDX1202 EWR → MEM May 27, 01:24 UTCMay 27, 03:34 UTC2h 10m
2026-05-24 FDX721 MEM → EWR May 24, 20:40 UTCMay 24, 21:50 UTC1h 10m
2026-05-23 FDX604 EWR → MEM May 23, 13:12 UTCMay 23, 15:22 UTC2h 10m
2026-05-23 FDX604 EWR → MEM May 23, 13:15 UTCMay 23, 15:20 UTC2h 5m
2026-05-23 FDX1514 MEM → EWR May 23, 09:00 UTCMay 23, 10:50 UTC1h 50m
2026-05-23 FDX1202 EWR → MEM May 23, 01:55 UTCMay 23, 04:00 UTC2h 4m
2026-05-22 FDX1514 MEM → EWR May 22, 08:45 UTCMay 22, 10:35 UTC1h 50m
2026-05-22 FDX1202 EWR → MEM May 22, 01:55 UTCMay 22, 04:00 UTC2h 5m
2026-05-21 FDX721 MEM → EWR May 21, 20:35 UTCMay 21, 22:45 UTC2h 10m
2026-05-21 FDX619 MIA → MEM May 21, 12:55 UTCMay 21, 14:45 UTC1h 50m
2026-05-21 FDX619 MIA → MEM May 21, 12:54 UTCMay 21, 14:45 UTC1h 51m
2026-05-21 FDX104 MEM → EWR May 21, 09:10 UTCMay 21, 10:55 UTC1h 45m
2026-05-21 FDX105 MIA → MEM May 21, 03:35 UTCMay 21, 05:20 UTC1h 45m
2026-05-20 FDX910 MEM → FLL May 20, 21:25 UTCMay 20, 23:10 UTC1h 45m
2026-05-20 FDX910 MEM → FLL May 20, 21:24 UTCMay 20, 23:10 UTC1h 46m
2026-05-20 FDX637 EWR → MEM May 20, 13:45 UTCMay 20, 15:45 UTC2h 0m
2026-05-20 FDX1514 MEM → EWR May 20, 09:10 UTCMay 20, 11:05 UTC1h 55m
2026-05-20 FDX105 MIA → MEM May 20, 03:45 UTCMay 20, 05:45 UTC2h 1m
2026-05-19 FDX910 MEM → FLL May 19, 21:15 UTCMay 19, 23:00 UTC1h 45m
2026-05-19 FDX619 MIA → MEM May 19, 13:25 UTCMay 19, 15:25 UTC2h 0m
2026-05-19 FDX104 MEM → EWR May 19, 09:30 UTCMay 19, 11:10 UTC1h 40m
2026-05-19 FDX104 MEM → EWR May 19, 09:24 UTCMay 19, 11:10 UTC1h 46m
2026-05-19 FDX1202 EWR → MEM May 19, 02:05 UTCMay 19, 04:05 UTC2h 0m
2026-05-18 FDX721 MEM → EWR May 18, 21:30 UTCMay 18, 23:35 UTC2h 5m
2026-05-18 FDX104 MEM → EWR May 18, 00:05 UTCMay 18, 02:05 UTC2h 0m
2026-05-17 FDX104 MEM → EWR May 17, 20:40 UTCMay 17, 22:25 UTC1h 45m
2026-05-16 FDX604 EWR → MEM May 16, 18:00 UTCMay 16, 20:05 UTC2h 5m
2026-05-16 FDX604 EWR → MEM May 16, 17:59 UTCMay 16, 20:05 UTC2h 6m
2026-05-16 FDX1514 MEM → EWR May 16, 13:41 UTCMay 16, 15:45 UTC2h 5m
2026-05-16 FDX1202 EWR → MEM May 16, 01:50 UTCMay 16, 03:55 UTC2h 5m
2026-05-16 FDX1202 EWR → MEM May 16, 01:48 UTCMay 16, 03:53 UTC2h 5m
2026-05-15 FDX1514 MEM → EWR May 15, 08:45 UTCMay 15, 10:40 UTC1h 55m
2026-05-15 FDX1202 EWR → MEM May 15, 01:50 UTCMay 15, 03:50 UTC2h 0m
2026-05-14 FDX721 MEM → EWR May 14, 20:45 UTCMay 14, 22:50 UTC2h 5m
2026-05-14 FDX619 MIA → MEM May 14, 13:20 UTCMay 14, 15:10 UTC1h 50m
2026-05-14 FDX104 MEM → EWR May 14, 09:40 UTCMay 14, 11:30 UTC1h 50m
2026-05-13 FDX619 MIA → MEM May 13, 13:40 UTCMay 13, 15:30 UTC1h 50m
2026-05-13 FDX104 MEM → EWR May 13, 09:25 UTCMay 13, 11:10 UTC1h 45m
2026-05-13 FDX105 MIA → MEM May 13, 03:25 UTCMay 13, 05:25 UTC2h 0m
2026-05-12 FDX910 MEM → FLL May 12, 22:15 UTCMay 12, 23:50 UTC1h 35m
2026-05-12 FDX910 MEM → FLL May 12, 22:11 UTCMay 12, 23:50 UTC1h 39m
2026-05-12 FDX619 MIA → MEM May 12, 14:00 UTCMay 12, 16:00 UTC2h 0m

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 N521FE page for operator, model, and routing details .

Mode-S A68D27 frequently asked

What is Mode-S code A68D27?
A68D27 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N521FE.
Where is Mode-S A68D27 registered?
Mode-S code A68D27 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 A68D27 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A68D27, octal 51506447, decimal 10,915,111.
What flights does A68D27 operate?
Mode-S A68D27 has broadcast 13 distinct callsigns, including FDX1514, FDX1202, FDX104, FDX619, FDX910.