Apparatus

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sensors Mode-S transponder

A512BB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N426JK · ROBINSON R-44 Raven · operated by HUKU 2 LLC

Hex
A512BB
Octal
51211273
Decimal
10,818,235
Country
US
Tail
N426JK
Type
R44
No current signal · last broadcast Jul 24, 16:55 UTC
Flights observed
38
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 16:55 UTC

Last known position

Most recent position reported by Mode-S A512BB.

Country allocation

The ICAO 24-bit address A512BB 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
N426JK - 38 2026-07-24

Recent flights last 38

DateFlightRouteTakeoffLandingDuration
2026-07-24 N426JK - Jul 24, 16:35 UTCJul 24, 16:55 UTC20m
2026-07-24 N426JK - Jul 24, 13:55 UTCJul 24, 14:30 UTC35m
2026-07-23 N426JK - Jul 23, 21:00 UTCJul 23, 21:10 UTC10m
2026-07-23 N426JK LDJ → PCT Jul 23, 13:40 UTCJul 23, 15:55 UTC2h 15m
2026-07-23 N426JK - Jul 23, 10:25 UTCJul 23, 12:50 UTC2h 25m
2026-07-23 N426JK - Jul 23, 09:50 UTCJul 23, 10:20 UTC30m
2026-07-22 N426JK - Jul 22, 23:45 UTCJul 23, 00:05 UTC20m
2026-07-22 N426JK - Jul 22, 22:30 UTCJul 22, 22:55 UTC25m
2026-07-22 N426JK PCT → PCT Jul 22, 21:15 UTCJul 22, 21:25 UTC10m
2026-07-21 N426JK - Jul 21, 13:35 UTCJul 21, 14:30 UTC55m
2026-07-20 N426JK - Jul 20, 20:40 UTCJul 20, 20:55 UTC15m
2026-07-16 N426JK LDJ → PCT Jul 16, 13:20 UTCJul 16, 16:40 UTC3h 20m
2026-07-16 N426JK PCT → LDJ Jul 16, 09:35 UTCJul 16, 12:25 UTC2h 50m
2026-07-15 N426JK - Jul 15, 20:25 UTCJul 15, 21:00 UTC35m
2026-07-15 N426JK PCT → PCT Jul 15, 18:20 UTCJul 15, 18:55 UTC35m
2026-07-15 N426JK PCT → PCT Jul 15, 14:50 UTCJul 15, 15:40 UTC50m
2026-07-15 N426JK - Jul 15, 13:25 UTCJul 15, 14:10 UTC45m
2026-07-13 N426JK - Jul 13, 21:55 UTCJul 13, 23:25 UTC1h 30m
2026-07-13 N426JK - Jul 13, 18:40 UTCJul 13, 20:00 UTC1h 20m
2026-07-13 N426JK - Jul 13, 15:25 UTCJul 13, 16:25 UTC1h 0m
2026-07-12 N426JK - Jul 12, 20:10 UTCJul 12, 20:40 UTC30m
2026-07-10 N426JK - Jul 10, 20:35 UTCJul 10, 20:50 UTC15m
2026-07-08 N426JK - Jul 8, 13:50 UTCJul 8, 14:25 UTC35m
2026-07-04 N426JK - Jul 4, 01:25 UTCJul 4, 02:05 UTC40m
2026-07-03 N426JK PCT → LDJ Jul 3, 23:30 UTCJul 3, 23:45 UTC15m
2026-06-13 N426JK - Jun 13, 17:40 UTCJun 13, 18:25 UTC45m
2026-06-09 N426JK - Jun 9, 14:30 UTCJun 9, 15:05 UTC35m
2026-06-05 N426JK - Jun 5, 14:10 UTCJun 5, 14:40 UTC30m
2026-06-04 N426JK PCT → PCT Jun 4, 17:05 UTCJun 4, 17:20 UTC15m
2026-05-01 N426JK PCT → PCT May 1, 20:15 UTCMay 1, 20:25 UTC10m
2026-05-01 N426JK - May 1, 18:00 UTCMay 1, 18:35 UTC35m
2026-04-30 N426JK - Apr 30, 18:50 UTCApr 30, 19:10 UTC20m
2026-04-30 N426JK LDJ → LDJ Apr 30, 17:00 UTCApr 30, 18:45 UTC1h 45m
2026-04-30 N426JK - Apr 30, 13:55 UTCApr 30, 16:15 UTC2h 20m
2026-04-30 N426JK - Apr 30, 13:30 UTCApr 30, 13:50 UTC20m
2026-04-27 N426JK PCT → PCT Apr 27, 20:30 UTCApr 27, 21:10 UTC40m
2026-04-21 N426JK - Apr 21, 11:25 UTCApr 21, 11:40 UTC15m
2026-04-21 N426JK - Apr 21, 06:25 UTCApr 21, 06:45 UTC20m

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 N426JK page for operator, model, and routing details .

Mode-S A512BB frequently asked

What is Mode-S code A512BB?
A512BB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N426JK.
Where is Mode-S A512BB registered?
Mode-S code A512BB 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 A512BB broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 16:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A512BB, octal 51211273, decimal 10,818,235.
What flights does A512BB operate?
Mode-S A512BB has broadcast 1 distinct callsign, including N426JK.