Apparatus

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sensors Mode-S transponder

AD4B73

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N956FE · CESSNA 208 Caravan · operated by FEDERAL EXPRESS CORPORATION

Hex
AD4B73
Octal
53245563
Decimal
11,357,043
Country
US
Tail
N956FE
Type
C208
No current signal · last broadcast 7d ago
Flights observed
118
Distinct callsigns
20
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S AD4B73.

Country allocation

The ICAO 24-bit address AD4B73 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
CFS7686 - 26 2026-07-07
CFS8667 Empire Airlines 13 2026-06-18
CFS7692 - 12 2026-06-18
CFS8686 Empire Airlines 10 2026-07-03
CFS8675 - 10 2026-07-10
CFS7675 - 8 2026-07-10
CFS8975 - 4 2026-07-09
CFS7698 Empire Airlines 4 2026-06-13
CFS4976 Empire Airlines 3 2026-05-12
CFS4975 - 3 2026-07-09
CFS4686 Empire Airlines 3 2026-07-06
CFS8976 Empire Airlines 2 2026-05-12
CFS8690 - 2 2026-07-07
CFS7690 - 2 2026-07-07
CFS7687 - 2 2026-06-27
CFS4972 Empire Airlines 2 2026-06-20
CFS4662 Empire Airlines 2 2026-05-11
CFS8980 Empire Airlines 1 2026-06-16
CFS8979 - 1 2026-05-08
CFS8978 Empire Airlines 1 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 CFS7675 - Jul 10, 23:00 UTCJul 11, 00:05 UTC1h 5m
2026-07-10 CFS8675 - Jul 10, 15:55 UTCJul 10, 17:10 UTC1h 15m
2026-07-09 CFS4975 - Jul 9, 17:10 UTCJul 9, 18:05 UTC55m
2026-07-09 CFS8975 - Jul 9, 15:30 UTCJul 9, 16:20 UTC50m
2026-07-08 CFS4975 - Jul 8, 19:20 UTCJul 8, 20:45 UTC1h 25m
2026-07-08 CFS8975 - Jul 8, 16:15 UTCJul 8, 17:35 UTC1h 20m
2026-07-07 CFS7690 CVO → PDX Jul 7, 23:40 UTCJul 8, 00:10 UTC30m
2026-07-07 CFS7690 - Jul 7, 22:35 UTCJul 7, 22:55 UTC20m
2026-07-07 CFS8690 - Jul 7, 15:15 UTCJul 7, 16:15 UTC1h 0m
2026-07-07 CFS7686 - Jul 7, 00:05 UTCJul 7, 00:25 UTC20m
2026-07-06 CFS7686 - Jul 6, 22:10 UTCJul 6, 22:40 UTC30m
2026-07-06 CFS4686 PDX → OTH Jul 6, 19:05 UTCJul 6, 20:00 UTC55m
2026-07-03 CFS7686 - Jul 3, 23:30 UTCJul 3, 23:50 UTC20m
2026-07-03 CFS7686 - Jul 3, 21:50 UTCJul 3, 22:25 UTC35m
2026-07-03 CFS8686 PDX → OTH Jul 3, 14:45 UTCJul 3, 15:45 UTC1h 0m
2026-07-03 CFS7686 SLE → PDX Jul 3, 00:00 UTCJul 3, 00:20 UTC20m
2026-07-02 CFS7686 - Jul 2, 22:05 UTCJul 2, 22:40 UTC35m
2026-07-02 CFS8686 PDX → OTH Jul 2, 15:35 UTCJul 2, 16:25 UTC50m
2026-07-02 CFS7686 SLE → PDX Jul 2, 00:00 UTCJul 2, 00:20 UTC20m
2026-07-01 CFS7686 - Jul 1, 22:05 UTCJul 1, 22:40 UTC35m
2026-07-01 CFS8686 PDX → OTH Jul 1, 15:20 UTCJul 1, 16:15 UTC55m
2026-07-01 CFS7686 SLE → PDX Jul 1, 00:05 UTCJul 1, 00:25 UTC20m
2026-06-30 CFS7686 - Jun 30, 22:00 UTCJun 30, 22:45 UTC45m
2026-06-30 CFS8686 PDX → OTH Jun 30, 16:15 UTCJun 30, 17:15 UTC1h 0m
2026-06-30 CFS7686 SLE → PDX Jun 30, 00:14 UTCJun 30, 00:39 UTC25m
2026-06-29 CFS7686 - Jun 29, 22:15 UTCJun 29, 22:59 UTC45m
2026-06-29 CFS4686 PDX → OTH Jun 29, 19:39 UTCJun 29, 20:30 UTC50m
2026-06-27 CFS7687 - Jun 27, 23:14 UTCJun 28, 00:45 UTC1h 30m
2026-06-27 CFS7687 - Jun 27, 22:09 UTCJun 27, 22:29 UTC20m
2026-06-27 CFS8690 - Jun 27, 15:00 UTCJun 27, 15:49 UTC50m
2026-06-27 CFS7686 SLE → PDX Jun 27, 00:00 UTCJun 27, 00:20 UTC20m
2026-06-26 CFS7686 - Jun 26, 22:25 UTCJun 26, 23:04 UTC40m
2026-06-26 CFS8686 PDX → OTH Jun 26, 14:39 UTCJun 26, 15:34 UTC55m
2026-06-25 CFS7686 - Jun 25, 23:59 UTCJun 26, 00:20 UTC20m
2026-06-25 CFS7686 - Jun 25, 22:04 UTCJun 25, 22:39 UTC35m
2026-06-25 CFS8686 PDX → OTH Jun 25, 15:20 UTCJun 25, 16:35 UTC1h 15m
2026-06-25 CFS7686 SLE → PDX Jun 25, 00:09 UTCJun 25, 00:29 UTC20m
2026-06-24 CFS7686 - Jun 24, 22:10 UTCJun 24, 22:49 UTC40m
2026-06-24 CFS8686 PDX → OTH Jun 24, 15:35 UTCJun 24, 16:40 UTC1h 5m
2026-06-23 CFS7686 SLE → PDX Jun 23, 23:59 UTCJun 24, 00:20 UTC20m
2026-06-23 CFS7686 - Jun 23, 22:10 UTCJun 23, 22:44 UTC35m
2026-06-23 CFS8686 PDX → OTH Jun 23, 15:55 UTCJun 23, 16:54 UTC1h 0m
2026-06-23 CFS7686 SLE → PDX Jun 23, 00:15 UTCJun 23, 00:35 UTC20m
2026-06-22 CFS7686 - Jun 22, 22:15 UTCJun 22, 22:49 UTC35m
2026-06-22 CFS4686 PDX → OTH Jun 22, 19:24 UTCJun 22, 20:14 UTC50m
2026-06-20 CFS4972 BFL → ONT Jun 20, 17:14 UTCJun 20, 18:34 UTC1h 20m
2026-06-20 CFS8972 PDX → MFR Jun 20, 14:54 UTCJun 20, 16:09 UTC1h 15m
2026-06-18 CFS7692 - Jun 18, 23:30 UTCJun 19, 00:20 UTC49m
2026-06-18 CFS8667 PDX → RDM Jun 18, 15:20 UTCJun 18, 16:00 UTC40m
2026-06-17 CFS7692 - Jun 17, 23:45 UTCJun 18, 00:35 UTC50m

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 N956FE page for operator, model, and routing details .

Mode-S AD4B73 frequently asked

What is Mode-S code AD4B73?
AD4B73 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N956FE.
Where is Mode-S AD4B73 registered?
Mode-S code AD4B73 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 AD4B73 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4B73, octal 53245563, decimal 11,357,043.
What flights does AD4B73 operate?
Mode-S AD4B73 has broadcast 20 distinct callsigns, including CFS7686, CFS8667, CFS7692, CFS8686, CFS8675.