Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AB6B21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N835CB · CESSNA 525B Citation CJ3 · operated by ROMANZA AVIATION LLC

Hex
AB6B21
Octal
52665441
Decimal
11,234,081
Country
US
Tail
N835CB
Type
C25B
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
96
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AB6B21.

Country allocation

The ICAO 24-bit address AB6B21 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
N835CB - 96 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N835CB - Jul 26, 18:50 UTCJul 26, 22:15 UTC3h 25m
2026-07-25 N835CB - Jul 25, 17:25 UTCJul 25, 19:10 UTC1h 45m
2026-07-23 N835CB SJC → CLD Jul 23, 23:00 UTCJul 24, 05:15 UTC6h 15m
2026-07-23 N835CB - Jul 23, 19:45 UTCJul 23, 20:50 UTC1h 5m
2026-07-22 N835CB - Jul 22, 17:00 UTCJul 22, 19:10 UTC2h 10m
2026-07-22 N835CB - Jul 22, 15:40 UTCJul 22, 16:00 UTC20m
2026-07-18 N835CB - Jul 18, 23:20 UTCJul 19, 00:05 UTC45m
2026-07-18 N835CB - Jul 18, 20:00 UTCJul 18, 22:30 UTC2h 30m
2026-07-17 N835CB BFL → RDM Jul 17, 18:10 UTCJul 17, 19:30 UTC1h 20m
2026-07-16 N835CB - Jul 16, 22:25 UTCJul 17, 00:14 UTC1h 50m
2026-07-16 N835CB - Jul 16, 18:50 UTCJul 16, 20:29 UTC1h 40m
2026-07-16 N835CB - Jul 16, 17:14 UTCJul 16, 17:45 UTC30m
2026-07-14 N835CB - Jul 14, 03:10 UTCJul 14, 03:40 UTC30m
2026-07-13 N835CB - Jul 13, 23:15 UTCJul 14, 02:30 UTC3h 15m
2026-07-13 N835CB - Jul 13, 19:25 UTCJul 13, 19:55 UTC30m
2026-07-13 N835CB - Jul 13, 15:45 UTCJul 13, 18:25 UTC2h 40m
2026-07-12 N835CB - Jul 12, 23:20 UTCJul 12, 23:50 UTC30m
2026-07-08 N835CB - Jul 8, 22:20 UTCJul 9, 01:30 UTC3h 10m
2026-07-08 N835CB - Jul 8, 16:55 UTCJul 8, 17:45 UTC50m
2026-07-07 N835CB - Jul 7, 23:50 UTCJul 8, 01:25 UTC1h 35m
2026-07-07 N835CB PHX → ABQ Jul 7, 20:05 UTCJul 7, 21:10 UTC1h 5m
2026-07-07 N835CB - Jul 7, 15:25 UTCJul 7, 16:15 UTC50m
2026-07-06 N835CB - Jul 6, 23:15 UTCJul 7, 01:10 UTC1h 55m
2026-07-06 N835CB VNY → MFR Jul 6, 21:00 UTCJul 6, 22:30 UTC1h 30m
2026-07-06 N835CB - Jul 6, 19:25 UTCJul 6, 19:50 UTC25m
2026-07-05 N835CB - Jul 5, 21:00 UTCJul 5, 21:35 UTC35m
2026-07-05 N835CB - Jul 5, 15:35 UTCJul 5, 20:05 UTC4h 30m
2026-07-04 N835CB - Jul 4, 19:50 UTCJul 4, 23:45 UTC3h 55m
2026-07-04 N835CB - Jul 4, 00:40 UTCJul 4, 01:20 UTC40m
2026-06-28 N835CB - Jun 28, 00:25 UTCJun 28, 02:20 UTC1h 55m
2026-06-27 N835CB - Jun 27, 21:19 UTCJun 27, 23:14 UTC1h 55m
2026-06-26 N835CB - Jun 26, 23:15 UTCJun 27, 03:09 UTC3h 55m
2026-06-26 N835CB - Jun 26, 18:15 UTCJun 26, 21:39 UTC3h 25m
2026-06-23 N835CB - Jun 23, 15:34 UTCJun 23, 17:20 UTC1h 45m
2026-06-21 N835CB - Jun 21, 13:59 UTCJun 21, 18:29 UTC4h 30m
2026-06-20 N835CB - Jun 20, 21:30 UTCJun 21, 00:49 UTC3h 20m
2026-06-20 N835CB - Jun 20, 17:54 UTCJun 20, 19:49 UTC1h 55m
2026-06-19 N835CB - Jun 19, 20:49 UTCJun 19, 22:19 UTC1h 30m
2026-06-19 N835CB - Jun 19, 18:09 UTCJun 19, 20:04 UTC1h 55m
2026-06-18 N835CB - Jun 18, 18:20 UTCJun 18, 20:00 UTC1h 40m
2026-06-18 N835CB - Jun 18, 17:00 UTCJun 18, 17:30 UTC30m
2026-06-15 N835CB HWD → CLD Jun 15, 00:20 UTCJun 15, 01:40 UTC1h 20m
2026-06-14 N835CB - Jun 14, 22:10 UTCJun 14, 23:20 UTC1h 10m
2026-06-14 N835CB - Jun 14, 19:10 UTCJun 14, 19:45 UTC35m
2026-06-12 N835CB - Jun 12, 17:05 UTCJun 12, 19:05 UTC2h 0m
2026-06-11 N835CB - Jun 11, 21:15 UTCJun 11, 21:45 UTC30m
2026-06-10 N835CB - Jun 10, 21:00 UTCJun 11, 00:10 UTC3h 10m
2026-06-10 N835CB - Jun 10, 16:15 UTCJun 10, 17:00 UTC45m
2026-06-09 N835CB - Jun 9, 20:50 UTCJun 9, 21:45 UTC55m
2026-06-08 N835CB CLD → STL Jun 8, 14:50 UTCJun 8, 18:10 UTC3h 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 N835CB page for operator, model, and routing details .

Mode-S AB6B21 frequently asked

What is Mode-S code AB6B21?
AB6B21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N835CB.
Where is Mode-S AB6B21 registered?
Mode-S code AB6B21 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 AB6B21 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB6B21, octal 52665441, decimal 11,234,081.
What flights does AB6B21 operate?
Mode-S AB6B21 has broadcast 1 distinct callsign, including N835CB.