Apparatus

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sensors Mode-S transponder

AC638D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N898FD · BOEING 777-200LR · operated by FEDERAL EXPRESS CORP

Hex
AC638D
Octal
53061615
Decimal
11,297,677
Country
US
Tail
N898FD
Type
B77L
No current signal · last broadcast Jul 26, 17:45 UTC
Flights observed
243
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:45 UTC

Last known position

Most recent position reported by Mode-S AC638D.

Country allocation

The ICAO 24-bit address AC638D 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
FDX60 - 12 2026-06-25
FDX5388 FedEx Express 11 2026-07-20
FDX5217 FedEx Express 11 2026-07-21
FDX5030 - 10 2026-07-16
FDX6030 - 9 2026-06-26
FDX6017 FedEx Express 6 2026-04-14
FDX85 FedEx Express 5 2026-06-19
FDX6022 FedEx Express 5 2026-07-18
FDX5279 - 5 2026-07-11
FDX15 - 5 2026-07-12
FDX10 - 5 2026-07-14
FDX9005 - 4 2026-06-22
FDX7 FedEx Express 4 2026-04-21
FDX5991 FedEx Express 4 2026-05-13
FDX5487 FedEx Express 4 2026-04-18
FDX5319 FedEx Express 4 2026-06-13
FDX5234 - 4 2026-07-18
FDX5230 FedEx Express 4 2026-07-23
FDX21 FedEx Express 4 2026-07-25
FDX97 FedEx Express 3 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FDX6081 SIN → SIN Jul 26, 17:30 UTCJul 26, 17:45 UTC15m
2026-07-26 FDX6081 SIN → SIN Jul 26, 14:35 UTCJul 26, 14:55 UTC20m
2026-07-25 FDX5603 CDG → SIN Jul 25, 22:10 UTCJul 26, 11:15 UTC13h 6m
2026-07-25 FDX21 CDG → MEM Jul 25, 11:15 UTCJul 25, 14:10 UTC2h 55m
2026-07-25 FDX21 CDG → MEM Jul 25, 07:00 UTCJul 25, 09:30 UTC2h 30m
2026-07-24 FDX21 CDG → MEM Jul 24, 22:50 UTCJul 24, 23:10 UTC20m
2026-07-24 FDX21 CDG → MEM Jul 24, 16:35 UTCJul 24, 19:50 UTC3h 15m
2026-07-24 FDX5813 ANC → KIX Jul 24, 05:05 UTCJul 24, 13:20 UTC8h 15m
2026-07-23 FDX5230 SZX → ANC Jul 23, 11:50 UTCJul 23, 13:10 UTC1h 20m
2026-07-23 FDX5230 SZX → ANC Jul 23, 11:45 UTCJul 23, 21:14 UTC9h 29m
2026-07-23 FDX5230 SZX → ANC Jul 23, 07:00 UTCJul 23, 07:20 UTC20m
2026-07-23 FDX5230 SZX → ANC Jul 23, 04:30 UTCJul 23, 05:05 UTC35m
2026-07-22 FDX5434 MEM → ICN Jul 22, 12:05 UTCJul 23, 02:15 UTC14h 10m
2026-07-21 FDX3 CDG → EWR Jul 21, 19:35 UTCJul 22, 04:50 UTC9h 15m
2026-07-21 FDX3 CDG → EWR Jul 21, 17:15 UTCJul 21, 18:05 UTC50m
2026-07-21 FDX5217 CDG → MEM Jul 21, 11:20 UTCJul 21, 14:20 UTC3h 0m
2026-07-20 FDX5217 CDG → MEM Jul 20, 22:40 UTCJul 21, 09:30 UTC10h 49m
2026-07-20 FDX5217 CDG → MEM Jul 20, 16:30 UTCJul 20, 19:30 UTC3h 0m
2026-07-20 FDX5388 MEM → ANC Jul 20, 04:15 UTCJul 20, 11:57 UTC7h 42m
2026-07-20 FDX5388 MEM → ANC Jul 20, 04:15 UTCJul 20, 05:55 UTC1h 40m
2026-07-18 FDX5234 IND → ANC Jul 18, 20:51 UTCJul 19, 02:51 UTC6h 0m
2026-07-18 FDX5234 - Jul 18, 20:55 UTCJul 19, 02:55 UTC6h 0m
2026-07-18 FDX6022 ANC → IND Jul 18, 11:35 UTCJul 18, 16:50 UTC5h 15m
2026-07-18 FDX6022 ANC → IND Jul 18, 11:32 UTCJul 18, 16:54 UTC5h 22m
2026-07-18 FDX6022 ANC → IND Jul 18, 00:15 UTCJul 18, 07:45 UTC7h 31m
2026-07-17 FDX6022 ANC → IND Jul 17, 09:20 UTCJul 18, 07:45 UTC22h 26m
2026-07-17 FDX6022 ANC → IND Jul 17, 07:20 UTCJul 18, 07:15 UTC23h 56m
2026-07-17 FDX5384 - Jul 17, 05:39 UTCJul 18, 01:50 UTC20h 10m
2026-07-16 FDX5135 - Jul 16, 21:45 UTCJul 16, 22:40 UTC55m
2026-07-16 FDX5024 - Jul 16, 19:20 UTCJul 16, 20:05 UTC45m
2026-07-16 FDX5030 - Jul 16, 12:20 UTCJul 16, 15:40 UTC3h 20m
2026-07-16 FDX5030 - Jul 16, 07:10 UTCJul 16, 09:30 UTC2h 20m
2026-07-15 FDX6041 - Jul 15, 07:20 UTCJul 16, 07:15 UTC23h 55m
2026-07-15 FDX6041 - Jul 15, 05:00 UTCJul 15, 09:05 UTC4h 5m
2026-07-14 FDX5809 - Jul 14, 22:05 UTCJul 14, 22:50 UTC44m
2026-07-14 FDX5809 - Jul 14, 19:35 UTCJul 14, 20:20 UTC45m
2026-07-14 FDX10 - Jul 14, 09:20 UTCJul 14, 17:40 UTC8h 20m
2026-07-13 FDX5262 - Jul 13, 17:30 UTCJul 14, 06:05 UTC12h 35m
2026-07-13 FDX5260 - Jul 13, 14:00 UTCJul 13, 14:55 UTC55m
2026-07-12 FDX15 ANC → NRT Jul 12, 19:23 UTCJul 13, 02:09 UTC6h 46m
2026-07-12 FDX15 - Jul 12, 19:25 UTCJul 13, 02:25 UTC7h 0m
2026-07-12 FDX15 - Jul 12, 08:40 UTCJul 12, 14:45 UTC6h 5m
2026-07-11 FDX5035 - Jul 11, 20:40 UTCJul 12, 05:30 UTC8h 50m
2026-07-11 FDX5279 - Jul 11, 11:25 UTCJul 11, 14:35 UTC3h 10m
2026-07-11 FDX5279 - Jul 11, 04:30 UTCJul 11, 10:55 UTC6h 25m
2026-07-10 FDX5279 - Jul 10, 23:20 UTCJul 11, 02:00 UTC2h 40m
2026-06-27 FDX6031 ANC → CAN Jun 27, 07:10 UTCJun 27, 15:14 UTC8h 5m
2026-06-26 FDX9162 - Jun 26, 20:24 UTCJun 27, 02:25 UTC6h 0m
2026-06-26 FDX5163 - Jun 26, 10:44 UTCJun 26, 16:44 UTC6h 0m
2026-06-26 FDX5163 ANC → MEM Jun 26, 10:45 UTCJun 26, 16:44 UTC5h 59m

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 N898FD page for operator, model, and routing details .

Mode-S AC638D frequently asked

What is Mode-S code AC638D?
AC638D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N898FD.
Where is Mode-S AC638D registered?
Mode-S code AC638D 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 AC638D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC638D, octal 53061615, decimal 11,297,677.
What flights does AC638D operate?
Mode-S AC638D has broadcast 20 distinct callsigns, including FDX60, FDX5388, FDX5217, FDX5030, FDX6030.