Apparatus

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sensors Mode-S transponder

A515E2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N427CR · operated by ALF IX LLC

Hex
A515E2
Octal
51212742
Decimal
10,819,042
Country
US
Tail
N427CR
Type
C172
No current signal · last broadcast 4h ago
Flights observed
48
Distinct callsigns
1
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A515E2.

Country allocation

The ICAO 24-bit address A515E2 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
ASI84 - 48 2026-07-04

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-07-04 ASI84 DVT → DVT Jul 4, 22:05 UTCJul 4, 23:50 UTC1h 45m
2026-07-04 ASI84 - Jul 4, 18:00 UTCJul 4, 19:15 UTC1h 15m
2026-07-04 ASI84 - Jul 4, 15:20 UTCJul 4, 16:45 UTC1h 25m
2026-06-29 ASI84 DVT → DVT Jun 29, 21:44 UTCJun 29, 22:55 UTC1h 10m
2026-06-29 ASI84 DVT → DVT Jun 29, 18:30 UTCJun 29, 20:35 UTC2h 5m
2026-06-29 ASI84 DVT → DVT Jun 29, 13:59 UTCJun 29, 16:39 UTC2h 40m
2026-06-28 ASI84 DVT → DVT Jun 28, 19:59 UTCJun 28, 20:59 UTC1h 0m
2026-06-28 ASI84 DVT → DVT Jun 28, 17:39 UTCJun 28, 19:14 UTC1h 35m
2026-06-28 ASI84 - Jun 28, 14:30 UTCJun 28, 16:29 UTC2h 0m
2026-06-27 ASI84 DVT → DVT Jun 27, 17:39 UTCJun 27, 20:09 UTC2h 30m
2026-06-27 ASI84 DVT → DVT Jun 27, 13:49 UTCJun 27, 16:14 UTC2h 25m
2026-06-24 ASI84 DVT → DVT Jun 24, 20:20 UTCJun 24, 22:35 UTC2h 15m
2026-06-24 ASI84 DVT → DVT Jun 24, 17:25 UTCJun 24, 18:55 UTC1h 30m
2026-06-24 ASI84 DVT → DVT Jun 24, 13:00 UTCJun 24, 15:00 UTC2h 0m
2026-06-23 ASI84 DVT → DVT Jun 23, 21:49 UTCJun 23, 23:50 UTC2h 0m
2026-06-23 ASI84 - Jun 23, 18:10 UTCJun 23, 20:10 UTC2h 0m
2026-06-23 ASI84 DVT → DVT Jun 23, 12:49 UTCJun 23, 15:30 UTC2h 40m
2026-06-22 ASI84 DVT → DVT Jun 22, 23:14 UTCJun 23, 00:15 UTC1h 0m
2026-06-22 ASI84 DVT → DVT Jun 22, 18:49 UTCJun 22, 21:19 UTC2h 30m
2026-06-22 ASI84 - Jun 22, 14:34 UTCJun 22, 17:15 UTC2h 40m
2026-06-21 ASI84 DVT → DVT Jun 21, 19:14 UTCJun 21, 20:50 UTC1h 35m
2026-06-20 ASI84 DVT → DVT Jun 20, 23:10 UTCJun 21, 01:45 UTC2h 35m
2026-06-20 ASI84 DVT → DVT Jun 20, 20:00 UTCJun 20, 21:49 UTC1h 50m
2026-06-20 ASI84 - Jun 20, 14:50 UTCJun 20, 16:39 UTC1h 50m
2026-06-17 ASI84 - Jun 17, 16:15 UTCJun 17, 17:25 UTC1h 10m
2026-05-25 ASI84 DVT → DVT May 25, 18:50 UTCMay 25, 20:34 UTC1h 44m
2026-05-23 ASI84 - May 23, 15:55 UTCMay 23, 16:20 UTC25m
2026-05-22 ASI84 - May 22, 17:00 UTCMay 22, 18:05 UTC1h 5m
2026-05-22 ASI84 - May 22, 14:00 UTCMay 22, 14:45 UTC45m
2026-05-21 ASI84 - May 21, 22:15 UTCMay 21, 23:30 UTC1h 15m
2026-05-20 ASI84 - May 20, 20:00 UTCMay 20, 21:15 UTC1h 15m
2026-05-20 ASI84 - May 20, 13:55 UTCMay 20, 16:55 UTC3h 0m
2026-05-20 ASI84 - May 20, 04:05 UTCMay 20, 05:20 UTC1h 16m
2026-05-19 ASI84 - May 19, 21:05 UTCMay 19, 21:45 UTC40m
2026-05-19 ASI84 - May 19, 18:05 UTCMay 19, 19:25 UTC1h 20m
2026-05-19 ASI84 - May 19, 15:25 UTCMay 19, 16:25 UTC1h 0m
2026-05-19 ASI84 - May 19, 13:20 UTCMay 19, 14:10 UTC50m
2026-05-18 ASI84 - May 18, 14:40 UTCMay 18, 15:50 UTC1h 10m
2026-05-18 ASI84 - May 18, 10:55 UTCMay 18, 12:15 UTC1h 20m
2026-05-17 ASI84 - May 17, 15:20 UTCMay 17, 16:30 UTC1h 10m
2026-05-16 ASI84 - May 16, 15:16 UTCMay 16, 16:00 UTC45m
2026-05-16 ASI84 - May 16, 00:25 UTCMay 16, 01:25 UTC1h 0m
2026-05-15 ASI84 - May 15, 22:05 UTCMay 15, 23:10 UTC1h 5m
2026-05-15 ASI84 - May 15, 18:45 UTCMay 15, 20:45 UTC2h 0m
2026-05-15 ASI84 - May 15, 16:20 UTCMay 15, 17:35 UTC1h 15m
2026-05-15 ASI84 - May 15, 13:55 UTCMay 15, 14:40 UTC45m
2026-05-12 ASI84 - May 12, 15:30 UTCMay 12, 16:40 UTC1h 10m
2026-05-04 ASI84 - May 4, 19:15 UTCMay 4, 20:20 UTC1h 5m

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 N427CR page for operator, model, and routing details .

Mode-S A515E2 frequently asked

What is Mode-S code A515E2?
A515E2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N427CR.
Where is Mode-S A515E2 registered?
Mode-S code A515E2 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 A515E2 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A515E2, octal 51212742, decimal 10,819,042.
What flights does A515E2 operate?
Mode-S A515E2 has broadcast 1 distinct callsign, including ASI84.