Apparatus

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sensors Mode-S transponder

A81A76

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N621FE · MCDONNELL-DOUGLAS MD-11 · operated by FEDERAL EXPRESS CORP

Hex
A81A76
Octal
52015166
Decimal
11,016,822
Country
US
Tail
N621FE
Type
MD11
No current signal · last broadcast Jul 24, 04:15 UTC
Flights observed
170
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 04:15 UTC

Last known position

Most recent position reported by Mode-S A81A76.

Country allocation

The ICAO 24-bit address A81A76 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
FDX105 - 17 2026-07-04
FDX1514 - 16 2026-07-14
FDX104 - 15 2026-07-03
FDX637 FedEx Express 12 2026-07-14
FDX1202 FedEx Express 12 2026-07-24
FDX910 FedEx Express 11 2026-06-16
FDX148 - 10 2026-07-21
FDX147 FedEx Express 10 2026-07-21
FDX619 FedEx Express 8 2026-06-16
FDX447 - 8 2026-07-08
FDX721 FedEx Express 5 2026-07-23
FDX547 - 5 2026-07-06
FDX1704 - 4 2026-07-08
FDX1604 - 4 2026-07-08
FDX208 FedEx Express 3 2026-07-17
FDX207 - 3 2026-07-21
FDX743 FedEx Express 2 2026-06-02
FDX550 - 2 2026-07-07
FDX1381 FedEx Express 2 2026-06-09
FDX985 FedEx Express 1 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 FDX1202 EWR → MEM Jul 24, 02:05 UTCJul 24, 04:15 UTC2h 10m
2026-07-23 FDX721 MEM → EWR Jul 23, 21:35 UTCJul 23, 23:30 UTC1h 55m
2026-07-23 FDX884 - Jul 23, 13:50 UTCJul 23, 15:40 UTC1h 50m
2026-07-23 FDX1584 MEM → ABQ Jul 23, 09:50 UTCJul 23, 11:30 UTC1h 40m
2026-07-21 FDX207 - Jul 21, 13:50 UTCJul 21, 15:40 UTC1h 50m
2026-07-21 FDX148 - Jul 21, 08:50 UTCJul 21, 10:35 UTC1h 45m
2026-07-21 FDX147 YYZ → MEM Jul 21, 01:55 UTCJul 21, 03:40 UTC1h 45m
2026-07-19 FDX148 - Jul 19, 22:35 UTCJul 20, 00:15 UTC1h 40m
2026-07-19 FDX147 YYZ → MEM Jul 19, 02:20 UTCJul 19, 04:10 UTC1h 50m
2026-07-17 FDX208 MEM → YYZ Jul 17, 21:25 UTCJul 17, 23:05 UTC1h 40m
2026-07-17 FDX1202 EWR → MEM Jul 17, 02:20 UTCJul 17, 04:25 UTC2h 5m
2026-07-17 FDX1202 EWR → MEM Jul 17, 02:20 UTCJul 17, 04:22 UTC2h 2m
2026-07-16 FDX721 - Jul 16, 20:45 UTCJul 16, 22:49 UTC2h 5m
2026-07-14 FDX637 EWR → MEM Jul 14, 14:40 UTCJul 14, 16:30 UTC1h 50m
2026-07-14 FDX1514 - Jul 14, 09:20 UTCJul 14, 11:30 UTC2h 10m
2026-07-14 FDX1202 - Jul 14, 01:55 UTCJul 14, 04:00 UTC2h 5m
2026-07-12 FDX757 - Jul 12, 20:25 UTCJul 12, 22:30 UTC2h 5m
2026-07-12 FDX147 - Jul 12, 01:40 UTCJul 12, 03:35 UTC1h 55m
2026-07-11 FDX148 - Jul 11, 09:45 UTCJul 11, 11:20 UTC1h 35m
2026-07-11 FDX148 MEM → YYZ Jul 11, 09:40 UTCJul 11, 11:25 UTC1h 45m
2026-07-10 FDX207 - Jul 10, 13:40 UTCJul 10, 15:35 UTC1h 55m
2026-07-10 FDX148 - Jul 10, 09:05 UTCJul 10, 10:45 UTC1h 40m
2026-07-08 FDX447 - Jul 8, 12:50 UTCJul 8, 14:45 UTC1h 55m
2026-07-08 FDX447 PHL → PHL Jul 8, 12:20 UTCJul 8, 12:30 UTC10m
2026-07-08 FDX447 PHL → PHL Jul 8, 11:25 UTCJul 8, 11:30 UTC5m
2026-07-08 FDX1704 PHL → PHL Jul 8, 11:00 UTCJul 8, 11:05 UTC5m
2026-07-08 FDX1704 IND → PHL Jul 8, 08:55 UTCJul 8, 10:10 UTC1h 15m
2026-07-08 FDX1604 PHL → IND Jul 8, 02:25 UTCJul 8, 03:55 UTC1h 30m
2026-07-07 FDX550 - Jul 7, 21:35 UTCJul 7, 23:25 UTC1h 50m
2026-07-07 FDX447 - Jul 7, 12:35 UTCJul 7, 14:35 UTC2h 0m
2026-07-07 FDX447 PHL → MEM Jul 7, 12:31 UTCJul 7, 14:35 UTC2h 4m
2026-07-07 FDX447 PHL → PHL Jul 7, 12:10 UTCJul 7, 12:15 UTC5m
2026-07-07 FDX447 PHL → PHL Jul 7, 10:35 UTCJul 7, 10:40 UTC5m
2026-07-07 FDX1704 - Jul 7, 09:15 UTCJul 7, 10:30 UTC1h 15m
2026-07-07 FDX1604 - Jul 7, 02:35 UTCJul 7, 04:00 UTC1h 25m
2026-07-07 FDX1604 PHL → PHL Jul 7, 02:05 UTCJul 7, 02:10 UTC5m
2026-07-06 FDX547 PHL → PHL Jul 6, 21:15 UTCJul 6, 21:25 UTC10m
2026-07-06 FDX547 PHL → PHL Jul 6, 00:55 UTCJul 6, 01:00 UTC5m
2026-07-06 FDX547 PHL → PHL Jul 6, 00:40 UTCJul 6, 00:45 UTC5m
2026-07-05 FDX547 - Jul 5, 22:25 UTCJul 6, 00:20 UTC1h 55m
2026-07-05 FDX547 MEM → PHL Jul 5, 22:20 UTCJul 6, 00:33 UTC2h 13m
2026-07-04 FDX105 - Jul 4, 03:30 UTCJul 4, 05:20 UTC1h 50m
2026-07-03 FDX104 - Jul 3, 09:05 UTCJul 3, 10:50 UTC1h 45m
2026-07-03 FDX1202 EWR → MEM Jul 3, 01:55 UTCJul 3, 04:10 UTC2h 15m
2026-07-02 FDX721 - Jul 2, 20:50 UTCJul 2, 23:00 UTC2h 10m
2026-07-02 FDX447 - Jul 2, 12:35 UTCJul 2, 14:20 UTC1h 45m
2026-07-02 FDX1704 - Jul 2, 08:55 UTCJul 2, 10:10 UTC1h 15m
2026-07-02 FDX1604 - Jul 2, 03:25 UTCJul 2, 04:40 UTC1h 15m
2026-07-01 FDX550 - Jul 1, 22:00 UTCJul 2, 00:00 UTC2h 0m
2026-07-01 FDX637 EWR → MEM Jul 1, 13:30 UTCJul 1, 15:25 UTC1h 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 N621FE page for operator, model, and routing details .

Mode-S A81A76 frequently asked

What is Mode-S code A81A76?
A81A76 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N621FE.
Where is Mode-S A81A76 registered?
Mode-S code A81A76 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 A81A76 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 04:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81A76, octal 52015166, decimal 11,016,822.
What flights does A81A76 operate?
Mode-S A81A76 has broadcast 20 distinct callsigns, including FDX105, FDX1514, FDX104, FDX637, FDX1202.