Apparatus

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sensors Mode-S transponder

A6EF00

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N546JB · operated by JENNIFER BUTLER LLC

Hex
A6EF00
Octal
51567400
Decimal
10,940,160
Country
US
Tail
N546JB
Type
SLG2
No current signal · last broadcast 5d ago
Flights observed
180
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A6EF00.

Country allocation

The ICAO 24-bit address A6EF00 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
N546JB - 180 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 N546JB TOA → TOA Jul 8, 18:55 UTCJul 8, 19:40 UTC45m
2026-07-08 N546JB - Jul 8, 16:40 UTCJul 8, 17:45 UTC1h 5m
2026-07-08 N546JB TOA → TOA Jul 8, 02:35 UTCJul 8, 03:35 UTC1h 0m
2026-07-08 N546JB - Jul 8, 00:40 UTCJul 8, 01:50 UTC1h 10m
2026-07-07 N546JB TOA → TOA Jul 7, 22:30 UTCJul 7, 23:50 UTC1h 20m
2026-07-07 N546JB - Jul 7, 21:10 UTCJul 7, 21:55 UTC45m
2026-07-07 N546JB TOA → CLD Jul 7, 18:50 UTCJul 7, 19:45 UTC55m
2026-07-06 N546JB TOA → TOA Jul 6, 22:50 UTCJul 6, 23:50 UTC1h 0m
2026-07-06 N546JB TOA → TOA Jul 6, 21:40 UTCJul 6, 21:55 UTC15m
2026-07-02 N546JB TOA → TOA Jul 2, 23:30 UTCJul 3, 00:50 UTC1h 20m
2026-07-02 N546JB TOA → TOA Jul 2, 20:25 UTCJul 2, 22:35 UTC2h 10m
2026-07-02 N546JB - Jul 2, 00:45 UTCJul 2, 01:35 UTC50m
2026-07-01 N546JB - Jul 1, 23:05 UTCJul 1, 23:20 UTC15m
2026-07-01 N546JB TOA → TOA Jul 1, 20:50 UTCJul 1, 22:00 UTC1h 10m
2026-07-01 N546JB TOA → TOA Jul 1, 18:35 UTCJul 1, 19:00 UTC25m
2026-07-01 N546JB TOA → TOA Jul 1, 01:15 UTCJul 1, 02:35 UTC1h 20m
2026-06-30 N546JB TOA → TOA Jun 30, 23:00 UTCJul 1, 00:10 UTC1h 10m
2026-06-30 N546JB TOA → TOA Jun 30, 21:50 UTCJun 30, 22:05 UTC15m
2026-06-30 N546JB TOA → TOA Jun 30, 19:50 UTCJun 30, 20:30 UTC40m
2026-06-29 N546JB - Jun 29, 22:44 UTCJun 29, 23:49 UTC1h 5m
2026-06-29 N546JB TOA → TOA Jun 29, 20:49 UTCJun 29, 21:39 UTC50m
2026-06-27 N546JB SPQ → TOA Jun 27, 19:45 UTCJun 27, 20:44 UTC1h 0m
2026-06-26 N546JB TOA → TOA Jun 26, 23:34 UTCJun 27, 00:14 UTC40m
2026-06-26 N546JB TOA → TOA Jun 26, 20:20 UTCJun 26, 22:05 UTC1h 45m
2026-06-26 N546JB - Jun 26, 01:50 UTCJun 26, 03:00 UTC1h 10m
2026-06-25 N546JB TOA → TOA Jun 25, 23:30 UTCJun 26, 00:24 UTC55m
2026-06-25 N546JB TOA → TOA Jun 25, 21:44 UTCJun 25, 22:49 UTC1h 5m
2026-06-25 N546JB TOA → TOA Jun 25, 19:49 UTCJun 25, 21:05 UTC1h 15m
2026-06-24 N546JB - Jun 24, 23:04 UTCJun 24, 23:54 UTC50m
2026-06-24 N546JB - Jun 24, 17:50 UTCJun 24, 18:34 UTC45m
2026-06-23 N546JB TOA → TOA Jun 23, 23:44 UTCJun 24, 00:59 UTC1h 15m
2026-06-23 N546JB TOA → TOA Jun 23, 21:39 UTCJun 23, 22:44 UTC1h 5m
2026-06-23 N546JB - Jun 23, 20:24 UTCJun 23, 20:49 UTC25m
2026-06-23 N546JB - Jun 23, 02:20 UTCJun 23, 03:29 UTC1h 10m
2026-06-22 N546JB TOA → TOA Jun 22, 23:50 UTCJun 23, 00:54 UTC1h 5m
2026-06-22 N546JB - Jun 22, 21:54 UTCJun 22, 22:24 UTC30m
2026-06-20 N546JB - Jun 20, 21:05 UTCJun 20, 21:25 UTC20m
2026-06-20 N546JB TOA → AVX Jun 20, 19:40 UTCJun 20, 20:05 UTC25m
2026-06-20 N546JB - Jun 20, 01:09 UTCJun 20, 02:35 UTC1h 25m
2026-06-19 N546JB - Jun 19, 22:39 UTCJun 19, 23:25 UTC45m
2026-06-19 N546JB TOA → TOA Jun 19, 20:49 UTCJun 19, 21:49 UTC1h 0m
2026-06-19 N546JB - Jun 19, 18:30 UTCJun 19, 19:49 UTC1h 20m
2026-06-18 N546JB - Jun 18, 23:30 UTCJun 19, 00:24 UTC54m
2026-06-18 N546JB - Jun 18, 20:35 UTCJun 18, 21:35 UTC1h 0m
2026-06-18 N546JB SBD → TOA Jun 18, 02:20 UTCJun 18, 03:05 UTC45m
2026-06-18 N546JB - Jun 18, 00:50 UTCJun 18, 01:35 UTC45m
2026-06-17 N546JB TOA → TOA Jun 17, 22:50 UTCJun 17, 23:40 UTC50m
2026-06-17 N546JB - Jun 17, 20:45 UTCJun 17, 21:45 UTC1h 0m
2026-06-16 N546JB TOA → TOA Jun 16, 21:35 UTCJun 16, 22:50 UTC1h 15m
2026-06-16 N546JB TOA → TOA Jun 16, 19:00 UTCJun 16, 19:15 UTC15m

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 N546JB page for operator, model, and routing details .

Mode-S A6EF00 frequently asked

What is Mode-S code A6EF00?
A6EF00 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N546JB.
Where is Mode-S A6EF00 registered?
Mode-S code A6EF00 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 A6EF00 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6EF00, octal 51567400, decimal 10,940,160.
What flights does A6EF00 operate?
Mode-S A6EF00 has broadcast 1 distinct callsign, including N546JB.