Apparatus

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sensors Mode-S transponder

A251F0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N249FE · BOEING 767-200 · operated by BOEING CO

Hex
A251F0
Octal
50450760
Decimal
10,637,808
Country
US
Tail
N249FE
Type
B762
Broadcasting now · callsign FDX1717 · 34,000 ft
Flights observed
207
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 09:15 UTC

Current position

A251F0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A251F0 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
FDX1874 - 5 2026-07-09
FDX1426 - 5 2026-06-23
FDX51 FedEx Express 4 2026-05-17
FDX1443 FedEx Express 4 2026-04-28
FDX1227 - 4 2026-07-17
FDX64 FedEx Express 3 2026-05-18
FDX568 FedEx Express 3 2026-04-17
FDX1684 FedEx Express 3 2026-05-29
FDX1635 FedEx Express 3 2026-07-22
FDX1552 FedEx Express 3 2026-05-27
FDX1545 FedEx Express 3 2026-04-16
FDX1492 FedEx Express 3 2026-07-21
FDX1471 - 3 2026-07-02
FDX1432 - 3 2026-07-16
FDX1346 FedEx Express 3 2026-05-28
FDX1344 - 3 2026-06-20
FDX1290 - 3 2026-07-10
FDX1200 FedEx Express 3 2026-05-21
FDX881 - 2 2026-06-28
FDX846 FedEx Express 2 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 FDX1574 MEM → IND Jul 24, 08:15 UTCJul 24, 09:15 UTC1h 0m
2026-07-24 FDX1248 GSO → MEM Jul 24, 02:10 UTCJul 24, 03:25 UTC1h 15m
2026-07-23 FDX1580 MEM → LAX Jul 23, 09:05 UTCJul 23, 10:15 UTC1h 10m
2026-07-22 FDX400 GSO → MEM Jul 22, 14:05 UTCJul 22, 17:35 UTC3h 30m
2026-07-22 FDX1705 - Jul 22, 10:20 UTCJul 22, 12:25 UTC2h 5m
2026-07-22 FDX1635 CLT → IND Jul 22, 03:00 UTCJul 22, 04:10 UTC1h 10m
2026-07-21 FDX1492 MEM → CLT Jul 21, 09:15 UTCJul 21, 10:20 UTC1h 5m
2026-07-21 FDX2209 - Jul 21, 01:50 UTCJul 21, 03:20 UTC1h 30m
2026-07-19 FDX746 MEM → MCO Jul 19, 20:30 UTCJul 19, 22:05 UTC1h 35m
2026-07-19 FDX108 - Jul 19, 10:30 UTCJul 19, 16:20 UTC5h 50m
2026-07-18 FDX157 - Jul 18, 09:35 UTCJul 18, 15:55 UTC6h 20m
2026-07-18 FDX2200 - Jul 18, 02:50 UTCJul 18, 04:30 UTC1h 40m
2026-07-17 FDX1444 - Jul 17, 07:55 UTCJul 17, 09:40 UTC1h 45m
2026-07-17 FDX1227 - Jul 17, 02:45 UTCJul 17, 04:04 UTC1h 20m
2026-07-16 FDX1432 - Jul 16, 08:30 UTCJul 16, 09:45 UTC1h 15m
2026-07-16 FDX1227 - Jul 16, 02:40 UTCJul 16, 03:55 UTC1h 15m
2026-07-15 FDX1432 - Jul 15, 08:40 UTCJul 15, 09:50 UTC1h 10m
2026-07-15 FDX1309 - Jul 15, 03:50 UTCJul 15, 04:40 UTC50m
2026-07-14 FDX1523 - Jul 14, 10:00 UTCJul 14, 10:40 UTC40m
2026-07-14 FDX2284 - Jul 14, 03:25 UTCJul 14, 04:20 UTC55m
2026-07-10 FDX1450 - Jul 10, 08:55 UTCJul 10, 09:50 UTC55m
2026-07-10 FDX1450 MEM → MCI Jul 10, 08:51 UTCJul 10, 09:48 UTC57m
2026-07-10 FDX1290 - Jul 10, 02:05 UTCJul 10, 05:25 UTC3h 20m
2026-07-09 FDX1874 - Jul 9, 11:40 UTCJul 9, 12:30 UTC50m
2026-07-09 FDX1874 OAK → LAS Jul 9, 09:40 UTCJul 9, 10:40 UTC1h 0m
2026-07-09 FDX1837 - Jul 9, 03:40 UTCJul 9, 05:10 UTC1h 30m
2026-07-08 FDX3711 - Jul 8, 20:45 UTCJul 8, 23:55 UTC3h 10m
2026-07-08 FDX3609 - Jul 8, 12:25 UTCJul 8, 13:55 UTC1h 30m
2026-07-08 FDX1721 - Jul 8, 08:40 UTCJul 8, 10:00 UTC1h 20m
2026-07-08 FDX1721 IND → EWR Jul 8, 08:40 UTCJul 8, 10:11 UTC1h 31m
2026-07-08 FDX1635 - Jul 8, 02:55 UTCJul 8, 03:50 UTC55m
2026-07-08 FDX1635 CLT → IND Jul 8, 02:50 UTCJul 8, 03:54 UTC1h 4m
2026-07-07 FDX1492 - Jul 7, 09:35 UTCJul 7, 10:40 UTC1h 5m
2026-07-07 FDX1213 - Jul 7, 02:05 UTCJul 7, 05:10 UTC3h 5m
2026-07-03 FDX1417 - Jul 3, 08:05 UTCJul 3, 11:35 UTC3h 30m
2026-07-03 FDX1201 DFW → MEM Jul 3, 02:12 UTCJul 3, 03:15 UTC1h 3m
2026-07-02 FDX1471 - Jul 2, 08:10 UTCJul 2, 09:10 UTC1h 0m
2026-07-02 FDX1471 MEM → DFW Jul 2, 08:08 UTCJul 2, 09:05 UTC57m
2026-07-02 FDX1219 SJC → MEM Jul 2, 02:00 UTCJul 2, 05:55 UTC3h 55m
2026-07-01 FDX3724 - Jul 1, 19:20 UTCJul 1, 23:30 UTC4h 10m
2026-07-01 FDX1654 SAN → IND Jul 1, 02:55 UTCJul 1, 06:15 UTC3h 20m
2026-06-30 FDX1422 - Jun 30, 09:55 UTCJun 30, 13:10 UTC3h 15m
2026-06-30 FDX1379 - Jun 30, 01:40 UTCJun 30, 05:00 UTC3h 20m
2026-06-29 FDX981 - Jun 29, 07:34 UTCJun 29, 11:04 UTC3h 30m
2026-06-28 FDX881 - Jun 28, 14:34 UTCJun 28, 17:00 UTC2h 25m
2026-06-28 FDX881 - Jun 28, 11:55 UTCJun 28, 13:14 UTC1h 20m
2026-06-27 FDX1508 - Jun 27, 18:04 UTCJun 27, 21:25 UTC3h 20m
2026-06-27 FDX1299 - Jun 27, 03:09 UTCJun 27, 04:15 UTC1h 5m
2026-06-26 FDX1425 - Jun 26, 08:15 UTCJun 26, 09:14 UTC1h 0m
2026-06-26 FDX1425 MEM → IAH Jun 26, 08:11 UTCJun 26, 09:14 UTC1h 3m

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 N249FE page for operator, model, and routing details .

Mode-S A251F0 frequently asked

What is Mode-S code A251F0?
A251F0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N249FE.
Where is Mode-S A251F0 registered?
Mode-S code A251F0 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 A251F0 broadcasting right now?
Yes. Mode-S A251F0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A251F0, octal 50450760, decimal 10,637,808.
What flights does A251F0 operate?
Mode-S A251F0 has broadcast 20 distinct callsigns, including FDX1874, FDX1426, FDX51, FDX1443, FDX1227.