Apparatus

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sensors Mode-S transponder

A1D3F5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N217EP · CESSNA 172 Skyhawk · operated by EPIC AVIATION INC

Hex
A1D3F5
Octal
50351765
Decimal
10,605,557
Country
US
Tail
N217EP
Type
C172
No current signal · last broadcast 19d ago
Flights observed
192
Distinct callsigns
1
Country
US
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S A1D3F5.

Country allocation

The ICAO 24-bit address A1D3F5 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 1 distinct

Callsign Airline Flights Last seen
EPI510 - 192 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EPI510 - Jul 26, 17:20 UTCJul 26, 18:25 UTC1h 5m
2026-07-26 EPI510 - Jul 26, 15:05 UTCJul 26, 15:55 UTC50m
2026-07-26 EPI510 - Jul 26, 12:20 UTCJul 26, 13:15 UTC55m
2026-07-25 EPI510 - Jul 25, 19:10 UTCJul 25, 20:10 UTC1h 0m
2026-07-25 EPI510 - Jul 25, 16:50 UTCJul 25, 18:05 UTC1h 15m
2026-07-25 EPI510 - Jul 25, 14:45 UTCJul 25, 15:35 UTC50m
2026-07-25 EPI510 - Jul 25, 11:40 UTCJul 25, 12:30 UTC50m
2026-07-24 EPI510 - Jul 24, 14:05 UTCJul 24, 15:10 UTC1h 5m
2026-07-24 EPI510 - Jul 24, 11:25 UTCJul 24, 12:10 UTC45m
2026-07-23 EPI510 - Jul 23, 20:55 UTCJul 23, 21:35 UTC40m
2026-07-23 EPI510 - Jul 23, 18:10 UTCJul 23, 18:20 UTC10m
2026-07-23 EPI510 - Jul 23, 14:55 UTCJul 23, 16:05 UTC1h 10m
2026-07-23 EPI510 - Jul 23, 11:45 UTCJul 23, 12:50 UTC1h 5m
2026-07-23 EPI510 - Jul 23, 01:20 UTCJul 23, 01:55 UTC35m
2026-07-22 EPI510 - Jul 22, 19:10 UTCJul 22, 20:35 UTC1h 25m
2026-07-22 EPI510 - Jul 22, 14:15 UTCJul 22, 15:10 UTC55m
2026-07-22 EPI510 - Jul 22, 11:10 UTCJul 22, 12:50 UTC1h 40m
2026-07-21 EPI510 - Jul 21, 16:00 UTCJul 21, 16:45 UTC45m
2026-07-20 EPI510 - Jul 20, 12:20 UTCJul 20, 14:15 UTC1h 55m
2026-07-19 EPI510 - Jul 19, 16:25 UTCJul 19, 17:20 UTC55m
2026-07-19 EPI510 - Jul 19, 13:55 UTCJul 19, 14:45 UTC50m
2026-07-18 EPI510 - Jul 18, 20:35 UTCJul 18, 21:10 UTC35m
2026-07-18 EPI510 - Jul 18, 15:50 UTCJul 18, 16:45 UTC55m
2026-07-17 EPI510 - Jul 17, 16:40 UTCJul 17, 16:59 UTC20m
2026-07-17 EPI510 - Jul 17, 15:05 UTCJul 17, 15:40 UTC35m
2026-07-17 EPI510 - Jul 17, 11:04 UTCJul 17, 12:40 UTC1h 35m
2026-07-16 EPI510 - Jul 16, 15:45 UTCJul 16, 17:14 UTC1h 30m
2026-07-16 EPI510 - Jul 16, 13:15 UTCJul 16, 14:29 UTC1h 15m
2026-07-16 EPI510 - Jul 16, 00:50 UTCJul 16, 01:50 UTC1h 0m
2026-07-15 EPI510 - Jul 15, 16:10 UTCJul 15, 16:40 UTC30m
2026-07-15 EPI510 - Jul 15, 12:35 UTCJul 15, 13:30 UTC55m
2026-07-14 EPI510 - Jul 14, 17:20 UTCJul 14, 18:20 UTC1h 0m
2026-07-14 EPI510 - Jul 14, 15:10 UTCJul 14, 16:10 UTC1h 0m
2026-07-14 EPI510 - Jul 14, 12:40 UTCJul 14, 13:40 UTC1h 0m
2026-07-13 EPI510 - Jul 13, 16:05 UTCJul 13, 17:05 UTC1h 0m
2026-07-13 EPI510 - Jul 13, 14:40 UTCJul 13, 15:05 UTC25m
2026-07-13 EPI510 - Jul 13, 11:30 UTCJul 13, 12:50 UTC1h 20m
2026-07-12 EPI510 - Jul 12, 15:10 UTCJul 12, 15:35 UTC25m
2026-07-12 EPI510 - Jul 12, 12:15 UTCJul 12, 13:25 UTC1h 10m
2026-07-11 EPI510 - Jul 11, 21:25 UTCJul 11, 22:20 UTC55m
2026-07-11 EPI510 - Jul 11, 19:40 UTCJul 11, 20:20 UTC40m
2026-07-11 EPI510 - Jul 11, 15:40 UTCJul 11, 16:25 UTC45m
2026-07-11 EPI510 - Jul 11, 12:15 UTCJul 11, 13:15 UTC1h 0m
2026-07-10 EPI510 - Jul 10, 21:45 UTCJul 10, 22:50 UTC1h 5m
2026-07-10 EPI510 - Jul 10, 16:40 UTCJul 10, 18:05 UTC1h 25m
2026-07-10 EPI510 - Jul 10, 13:50 UTCJul 10, 15:00 UTC1h 10m
2026-07-10 EPI510 - Jul 10, 10:55 UTCJul 10, 12:00 UTC1h 5m
2026-07-09 EPI510 - Jul 9, 23:25 UTCJul 10, 00:10 UTC45m
2026-07-09 EPI510 - Jul 9, 21:00 UTCJul 9, 21:40 UTC40m
2026-07-09 EPI510 - Jul 9, 13:55 UTCJul 9, 14:30 UTC35m

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 N217EP page for operator, model, and routing details .

Mode-S A1D3F5 frequently asked

What is Mode-S code A1D3F5?
A1D3F5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N217EP.
Where is Mode-S A1D3F5 registered?
Mode-S code A1D3F5 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 A1D3F5 broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D3F5, octal 50351765, decimal 10,605,557.
What flights does A1D3F5 operate?
Mode-S A1D3F5 has broadcast 1 distinct callsign, including EPI510.