Apparatus

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sensors Mode-S transponder

A8258B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N624EP · operated by EPIC AVIATION INC

Hex
A8258B
Octal
52022613
Decimal
11,019,659
Country
US
Tail
N624EP
Type
PA44
No current signal · last broadcast 19d ago
Flights observed
309
Distinct callsigns
1
Country
US
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S A8258B.

Country allocation

The ICAO 24-bit address A8258B 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
EPI624 - 309 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EPI624 - Jul 26, 15:55 UTCJul 26, 16:40 UTC45m
2026-07-26 EPI624 - Jul 26, 13:50 UTCJul 26, 14:10 UTC20m
2026-07-26 EPI624 - Jul 26, 00:10 UTCJul 26, 00:35 UTC25m
2026-07-25 EPI624 - Jul 25, 19:50 UTCJul 25, 21:00 UTC1h 10m
2026-07-25 EPI624 - Jul 25, 17:55 UTCJul 25, 18:50 UTC55m
2026-07-25 EPI624 - Jul 25, 15:55 UTCJul 25, 16:35 UTC40m
2026-07-25 EPI624 - Jul 25, 13:30 UTCJul 25, 14:15 UTC45m
2026-07-25 EPI624 - Jul 25, 11:45 UTCJul 25, 12:30 UTC45m
2026-07-24 EPI624 - Jul 24, 18:20 UTCJul 24, 19:30 UTC1h 10m
2026-07-24 EPI624 - Jul 24, 16:05 UTCJul 24, 16:55 UTC50m
2026-07-24 EPI624 - Jul 24, 14:00 UTCJul 24, 15:05 UTC1h 5m
2026-07-24 EPI624 - Jul 24, 11:40 UTCJul 24, 12:50 UTC1h 10m
2026-07-23 EPI624 - Jul 23, 15:15 UTCJul 23, 15:50 UTC35m
2026-07-23 EPI624 - Jul 23, 13:35 UTCJul 23, 14:20 UTC45m
2026-07-22 EPI624 - Jul 22, 21:45 UTCJul 22, 22:45 UTC1h 0m
2026-07-22 EPI624 - Jul 22, 19:25 UTCJul 22, 20:05 UTC40m
2026-07-22 EPI624 - Jul 22, 17:25 UTCJul 22, 18:20 UTC55m
2026-07-22 EPI624 - Jul 22, 15:20 UTCJul 22, 16:20 UTC1h 0m
2026-07-22 EPI624 - Jul 22, 13:35 UTCJul 22, 14:00 UTC25m
2026-07-22 EPI624 - Jul 22, 11:10 UTCJul 22, 12:40 UTC1h 30m
2026-07-21 EPI624 - Jul 21, 19:05 UTCJul 21, 20:05 UTC1h 0m
2026-07-21 EPI624 - Jul 21, 17:30 UTCJul 21, 17:55 UTC25m
2026-07-21 EPI624 - Jul 21, 15:25 UTCJul 21, 16:00 UTC35m
2026-07-21 EPI624 - Jul 21, 13:25 UTCJul 21, 14:25 UTC1h 0m
2026-07-21 EPI624 - Jul 21, 11:35 UTCJul 21, 12:30 UTC55m
2026-07-20 EPI624 - Jul 20, 17:35 UTCJul 20, 18:00 UTC25m
2026-07-20 EPI624 - Jul 20, 13:30 UTCJul 20, 14:15 UTC45m
2026-07-19 EPI624 - Jul 19, 23:20 UTCJul 19, 23:45 UTC25m
2026-07-19 EPI624 - Jul 19, 15:50 UTCJul 19, 16:40 UTC50m
2026-07-19 EPI624 - Jul 19, 14:05 UTCJul 19, 14:45 UTC40m
2026-07-19 EPI624 - Jul 19, 11:40 UTCJul 19, 12:30 UTC50m
2026-07-19 EPI624 - Jul 19, 01:35 UTCJul 19, 01:50 UTC15m
2026-07-18 EPI624 - Jul 18, 20:05 UTCJul 18, 20:55 UTC50m
2026-07-18 EPI624 - Jul 18, 18:25 UTCJul 18, 19:00 UTC35m
2026-07-18 EPI624 - Jul 18, 15:40 UTCJul 18, 16:40 UTC1h 0m
2026-07-18 EPI624 - Jul 18, 13:50 UTCJul 18, 14:40 UTC50m
2026-06-30 EPI624 - Jun 30, 19:35 UTCJun 30, 20:10 UTC35m
2026-06-29 EPI624 - Jun 29, 16:19 UTCJun 29, 16:59 UTC40m
2026-06-29 EPI624 - Jun 29, 11:45 UTCJun 29, 12:29 UTC45m
2026-06-28 EPI624 - Jun 28, 12:35 UTCJun 28, 13:34 UTC1h 0m
2026-06-27 EPI624 - Jun 27, 21:50 UTCJun 27, 21:59 UTC10m
2026-06-26 EPI624 - Jun 26, 18:29 UTCJun 26, 19:14 UTC45m
2026-06-26 EPI624 - Jun 26, 15:34 UTCJun 26, 17:00 UTC1h 25m
2026-06-26 EPI624 - Jun 26, 12:59 UTCJun 26, 13:49 UTC50m
2026-06-26 EPI624 - Jun 26, 02:44 UTCJun 26, 02:54 UTC10m
2026-06-25 EPI624 - Jun 25, 13:40 UTCJun 25, 14:44 UTC1h 5m
2026-06-25 EPI624 - Jun 25, 11:35 UTCJun 25, 12:15 UTC40m
2026-06-24 EPI624 - Jun 24, 23:04 UTCJun 25, 00:05 UTC1h 0m
2026-06-24 EPI624 - Jun 24, 11:54 UTCJun 24, 12:30 UTC35m
2026-06-23 EPI624 - Jun 23, 22:34 UTCJun 23, 23:14 UTC40m

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 N624EP page for operator, model, and routing details .

Mode-S A8258B frequently asked

What is Mode-S code A8258B?
A8258B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N624EP.
Where is Mode-S A8258B registered?
Mode-S code A8258B 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 A8258B 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 A8258B, octal 52022613, decimal 11,019,659.
What flights does A8258B operate?
Mode-S A8258B has broadcast 1 distinct callsign, including EPI624.