Apparatus

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sensors Mode-S transponder

A21417

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N233EP · operated by EPIC AVIATION INC

Hex
A21417
Octal
50412027
Decimal
10,621,975
Country
US
Tail
N233EP
Type
C172
No current signal · last broadcast 19d ago
Flights observed
185
Distinct callsigns
1
Country
US
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S A21417.

Country allocation

The ICAO 24-bit address A21417 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
EPI233 - 185 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EPI233 APA → APA Jul 26, 04:30 UTCJul 26, 06:00 UTC1h 30m
2026-07-25 EPI233 - Jul 25, 17:50 UTCJul 25, 18:45 UTC55m
2026-07-25 EPI233 - Jul 25, 12:35 UTCJul 25, 13:50 UTC1h 15m
2026-07-24 EPI233 - Jul 24, 16:35 UTCJul 24, 18:25 UTC1h 50m
2026-07-24 EPI233 - Jul 24, 13:30 UTCJul 24, 14:20 UTC50m
2026-07-23 EPI233 - Jul 23, 17:15 UTCJul 23, 17:55 UTC40m
2026-07-23 EPI233 - Jul 23, 14:25 UTCJul 23, 14:55 UTC30m
2026-07-19 EPI233 APA → APA Jul 19, 16:20 UTCJul 19, 17:40 UTC1h 20m
2026-07-19 EPI233 - Jul 19, 14:15 UTCJul 19, 15:20 UTC1h 5m
2026-07-18 EPI233 - Jul 18, 06:15 UTCJul 18, 06:30 UTC15m
2026-07-18 EPI233 - Jul 18, 03:50 UTCJul 18, 04:15 UTC25m
2026-07-17 EPI233 APA → APA Jul 17, 17:09 UTCJul 17, 18:10 UTC1h 0m
2026-07-17 EPI233 APA → APA Jul 17, 13:05 UTCJul 17, 13:45 UTC40m
2026-07-16 EPI233 APA → APA Jul 16, 15:35 UTCJul 16, 16:19 UTC45m
2026-07-16 EPI233 - Jul 16, 13:10 UTCJul 16, 14:00 UTC50m
2026-07-15 EPI233 - Jul 15, 17:55 UTCJul 15, 18:30 UTC35m
2026-07-15 EPI233 APA → APA Jul 15, 14:15 UTCJul 15, 15:55 UTC1h 40m
2026-07-15 EPI233 - Jul 15, 12:05 UTCJul 15, 12:55 UTC50m
2026-07-15 EPI233 APA → APA Jul 15, 01:40 UTCJul 15, 02:30 UTC50m
2026-07-14 EPI233 - Jul 14, 17:50 UTCJul 14, 18:35 UTC45m
2026-07-14 EPI233 - Jul 14, 15:25 UTCJul 14, 16:20 UTC55m
2026-07-12 EPI233 - Jul 12, 17:50 UTCJul 12, 19:01 UTC1h 10m
2026-07-12 EPI233 - Jul 12, 15:25 UTCJul 12, 16:30 UTC1h 5m
2026-07-11 EPI233 - Jul 11, 16:40 UTCJul 11, 17:35 UTC55m
2026-07-11 EPI233 - Jul 11, 15:15 UTCJul 11, 15:30 UTC15m
2026-07-11 EPI233 - Jul 11, 12:35 UTCJul 11, 13:00 UTC25m
2026-07-09 EPI233 - Jul 9, 16:55 UTCJul 9, 17:55 UTC1h 0m
2026-07-09 EPI233 - Jul 9, 13:35 UTCJul 9, 14:45 UTC1h 10m
2026-07-09 EPI233 - Jul 9, 03:35 UTCJul 9, 03:55 UTC20m
2026-07-08 EPI233 - Jul 8, 15:30 UTCJul 8, 16:55 UTC1h 25m
2026-07-08 EPI233 APA → APA Jul 8, 12:15 UTCJul 8, 13:55 UTC1h 40m
2026-07-07 EPI233 - Jul 7, 17:40 UTCJul 7, 18:40 UTC1h 0m
2026-07-07 EPI233 - Jul 7, 15:20 UTCJul 7, 16:15 UTC55m
2026-07-07 EPI233 APA → APA Jul 7, 13:10 UTCJul 7, 14:05 UTC55m
2026-07-06 EPI233 - Jul 6, 16:00 UTCJul 6, 17:15 UTC1h 15m
2026-07-06 EPI233 APA → APA Jul 6, 11:55 UTCJul 6, 13:05 UTC1h 10m
2026-07-05 EPI233 - Jul 5, 18:25 UTCJul 5, 18:45 UTC20m
2026-07-03 EPI233 - Jul 3, 21:10 UTCJul 3, 21:45 UTC35m
2026-07-03 EPI233 - Jul 3, 17:25 UTCJul 3, 19:05 UTC1h 40m
2026-07-02 EPI233 - Jul 2, 17:15 UTCJul 2, 17:55 UTC40m
2026-07-02 EPI233 - Jul 2, 15:30 UTCJul 2, 16:35 UTC1h 5m
2026-07-02 EPI233 - Jul 2, 13:00 UTCJul 2, 13:30 UTC30m
2026-06-30 EPI233 - Jun 30, 13:55 UTCJun 30, 14:50 UTC55m
2026-06-29 EPI233 - Jun 29, 15:24 UTCJun 29, 17:24 UTC2h 0m
2026-06-29 EPI233 - Jun 29, 14:14 UTCJun 29, 14:39 UTC25m
2026-06-28 EPI233 APA → APA Jun 28, 16:09 UTCJun 28, 17:50 UTC1h 40m
2026-06-27 EPI233 - Jun 27, 03:15 UTCJun 27, 04:15 UTC1h 0m
2026-06-26 EPI233 - Jun 26, 12:39 UTCJun 26, 14:55 UTC2h 15m
2026-06-22 EPI233 - Jun 22, 14:05 UTCJun 22, 14:24 UTC20m
2026-06-18 EPI233 - Jun 18, 20:40 UTCJun 18, 21:40 UTC1h 0m

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 N233EP page for operator, model, and routing details .

Mode-S A21417 frequently asked

What is Mode-S code A21417?
A21417 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N233EP.
Where is Mode-S A21417 registered?
Mode-S code A21417 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 A21417 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 A21417, octal 50412027, decimal 10,621,975.
What flights does A21417 operate?
Mode-S A21417 has broadcast 1 distinct callsign, including EPI233.