Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A27921

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N259CB · PIPER PA-28-140/150/160/180 · operated by CALIFORNIA BAPTIST UNIVERSITY

Hex
A27921
Octal
50474441
Decimal
10,647,841
Country
US
Tail
N259CB
Type
P28A
Broadcasting now · callsign N259CB · 1,100 ft
Flights observed
53
Distinct callsigns
1
Country
US
Last broadcast
3h ago

Current position

A27921 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A27921 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
N259CB - 53 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N259CB RAL → RAL May 29, 23:35 UTCMay 30, 00:40 UTC1h 5m
2026-05-28 N259CB RAL → RAL May 28, 18:30 UTCMay 28, 19:40 UTC1h 10m
2026-05-28 N259CB RAL → RAL May 28, 16:50 UTCMay 28, 17:25 UTC35m
2026-05-28 N259CB RAL → RAL May 28, 04:10 UTCMay 28, 04:25 UTC15m
2026-05-28 N259CB RAL → RAL May 28, 03:35 UTCMay 28, 04:05 UTC30m
2026-05-27 N259CB RAL → RAL May 27, 21:20 UTCMay 27, 22:45 UTC1h 25m
2026-05-27 N259CB RAL → RAL May 27, 18:25 UTCMay 27, 19:20 UTC55m
2026-05-26 N259CB OXR → RAL May 26, 21:04 UTCMay 27, 00:10 UTC3h 5m
2026-05-26 N259CB - May 26, 19:20 UTCMay 26, 20:15 UTC55m
2026-05-21 N259CB - May 21, 23:55 UTCMay 22, 00:45 UTC50m
2026-05-21 N259CB - May 21, 21:35 UTCMay 21, 22:15 UTC40m
2026-05-21 N259CB RAL → RAL May 21, 19:10 UTCMay 21, 20:20 UTC1h 10m
2026-05-19 N259CB RAL → RAL May 19, 16:20 UTCMay 19, 17:45 UTC1h 25m
2026-05-19 N259CB RAL → RAL May 19, 00:10 UTCMay 19, 01:15 UTC1h 5m
2026-05-18 N259CB RAL → RAL May 18, 17:15 UTCMay 18, 18:40 UTC1h 24m
2026-05-15 N259CB RAL → RAL May 15, 18:20 UTCMay 15, 19:15 UTC55m
2026-05-14 N259CB SBP → RAL May 14, 21:05 UTCMay 14, 23:00 UTC1h 55m
2026-05-14 N259CB RAL → SBP May 14, 17:25 UTCMay 14, 19:10 UTC1h 45m
2026-05-14 N259CB RAL → RAL May 14, 15:40 UTCMay 14, 16:35 UTC55m
2026-05-14 N259CB RAL → RAL May 14, 03:30 UTCMay 14, 04:00 UTC30m
2026-05-14 N259CB RAL → RAL May 14, 01:25 UTCMay 14, 02:25 UTC1h 0m
2026-05-13 N259CB RAL → RAL May 13, 22:30 UTCMay 13, 23:45 UTC1h 15m
2026-05-13 N259CB RAL → RAL May 13, 20:20 UTCMay 13, 21:15 UTC55m
2026-05-13 N259CB RAL → RAL May 13, 18:05 UTCMay 13, 19:00 UTC55m
2026-05-12 N259CB RAL → RAL May 12, 22:45 UTCMay 12, 23:35 UTC50m
2026-05-11 N259CB RAL → RAL May 11, 20:20 UTCMay 11, 21:35 UTC1h 15m
2026-05-11 N259CB RAL → RAL May 11, 18:10 UTCMay 11, 18:15 UTC5m
2026-05-11 N259CB RAL → RAL May 11, 17:45 UTCMay 11, 17:50 UTC5m
2026-05-11 N259CB RAL → RAL May 11, 17:20 UTCMay 11, 17:30 UTC10m
2026-05-11 N259CB RAL → RAL May 11, 17:05 UTCMay 11, 17:10 UTC5m
2026-05-11 N259CB RAL → RAL May 11, 16:55 UTCMay 11, 17:00 UTC6m
2026-05-08 N259CB RAL → RAL May 8, 22:30 UTCMay 8, 23:55 UTC1h 25m
2026-05-08 N259CB RAL → RAL May 8, 19:05 UTCMay 8, 19:55 UTC50m
2026-05-08 N259CB RAL → RAL May 8, 17:25 UTCMay 8, 18:20 UTC55m
2026-05-07 N259CB SBA → RAL May 7, 22:20 UTCMay 7, 23:29 UTC1h 10m
2026-05-07 N259CB - May 7, 21:05 UTCMay 7, 21:55 UTC50m
2026-05-07 N259CB - May 7, 19:20 UTCMay 7, 19:50 UTC30m
2026-05-07 N259CB RAL → RAL May 7, 16:55 UTCMay 7, 17:55 UTC1h 0m
2026-05-06 N259CB RAL → RAL May 6, 20:35 UTCMay 6, 21:25 UTC50m
2026-05-06 N259CB RAL → RAL May 6, 17:30 UTCMay 6, 18:10 UTC39m
2026-05-04 N259CB RAL → RAL May 4, 18:00 UTCMay 4, 19:10 UTC1h 11m
2026-04-28 N259CB RAL → RAL Apr 28, 18:05 UTCApr 28, 18:55 UTC50m
2026-04-27 N259CB RAL → RAL Apr 27, 23:35 UTCApr 28, 00:35 UTC1h 0m
2026-04-27 N259CB RAL → RAL Apr 27, 21:45 UTCApr 27, 23:00 UTC1h 15m
2026-04-23 N259CB RAL → RAL Apr 23, 20:30 UTCApr 23, 21:35 UTC1h 5m
2026-04-23 N259CB RAL → RAL Apr 23, 17:55 UTCApr 23, 19:05 UTC1h 10m
2026-04-22 N259CB RAL → RAL Apr 22, 21:25 UTCApr 22, 22:05 UTC40m
2026-04-22 N259CB RAL → RAL Apr 22, 19:15 UTCApr 22, 20:10 UTC55m
2026-04-21 N259CB RAL → RAL Apr 21, 17:10 UTCApr 21, 17:50 UTC40m
2026-04-20 N259CB RAL → RAL Apr 20, 21:20 UTCApr 20, 22:05 UTC45m

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 N259CB page for operator, model, and routing details .

Mode-S A27921 frequently asked

What is Mode-S code A27921?
A27921 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N259CB.
Where is Mode-S A27921 registered?
Mode-S code A27921 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 A27921 broadcasting right now?
Yes. Mode-S A27921 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A27921, octal 50474441, decimal 10,647,841.
What flights does A27921 operate?
Mode-S A27921 has broadcast 1 distinct callsign, including N259CB.