Apparatus

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sensors Mode-S transponder

ACF142

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N933ER · operated by ELOY RENFROW

Hex
ACF142
Octal
53170502
Decimal
11,333,954
Country
US
Tail
N933ER
No current signal · last broadcast 2d ago
Flights observed
21
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S ACF142.

Country allocation

The ICAO 24-bit address ACF142 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
N933ER - 21 2026-07-11

Recent flights last 21

DateFlightRouteTakeoffLandingDuration
2026-07-11 N933ER SMX → SMX Jul 11, 20:25 UTCJul 11, 21:20 UTC55m
2026-07-11 N933ER - Jul 11, 01:10 UTCJul 11, 02:05 UTC55m
2026-07-10 N933ER SMX → MIT Jul 10, 23:50 UTCJul 11, 00:40 UTC50m
2026-07-10 N933ER SMX → SMX Jul 10, 21:45 UTCJul 10, 21:50 UTC5m
2026-07-10 N933ER - Jul 10, 18:45 UTCJul 10, 19:25 UTC40m
2026-07-10 N933ER SQA → MIT Jul 10, 17:25 UTCJul 10, 18:05 UTC40m
2026-07-10 N933ER SMX → SQA Jul 10, 01:25 UTCJul 10, 03:50 UTC2h 25m
2026-07-09 N933ER SMX → SMX Jul 9, 23:15 UTCJul 10, 00:50 UTC1h 35m
2026-07-09 N933ER SMX → SMX Jul 9, 16:55 UTCJul 9, 19:30 UTC2h 35m
2026-07-09 N933ER - Jul 9, 02:00 UTCJul 9, 03:40 UTC1h 40m
2026-07-08 N933ER - Jul 8, 22:45 UTCJul 9, 01:15 UTC2h 30m
2026-07-08 N933ER - Jul 8, 17:00 UTCJul 8, 19:05 UTC2h 5m
2026-07-08 N933ER - Jul 8, 02:55 UTCJul 8, 03:50 UTC55m
2026-07-07 N933ER SMX → SMX Jul 7, 22:40 UTCJul 8, 01:40 UTC3h 0m
2026-07-07 N933ER SMX → SMX Jul 7, 18:15 UTCJul 7, 20:40 UTC2h 25m
2026-07-07 N933ER SMX → SMX Jul 7, 02:15 UTCJul 7, 03:15 UTC1h 0m
2026-07-06 N933ER SMX → SMX Jul 6, 20:25 UTCJul 6, 21:00 UTC35m
2026-07-05 N933ER SMX → SMX Jul 5, 21:50 UTCJul 6, 00:05 UTC2h 15m
2026-07-05 N933ER SMX → SMX Jul 5, 18:00 UTCJul 5, 20:45 UTC2h 45m
2026-07-04 N933ER SMX → SMX Jul 4, 18:40 UTCJul 4, 21:15 UTC2h 35m
2026-07-03 N933ER SMX → SMX Jul 3, 21:10 UTCJul 3, 23:30 UTC2h 20m

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 N933ER page for operator, model, and routing details .

Mode-S ACF142 frequently asked

What is Mode-S code ACF142?
ACF142 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N933ER.
Where is Mode-S ACF142 registered?
Mode-S code ACF142 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 ACF142 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACF142, octal 53170502, decimal 11,333,954.
What flights does ACF142 operate?
Mode-S ACF142 has broadcast 1 distinct callsign, including N933ER.