Apparatus

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sensors Mode-S transponder

A27A83

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N259SF · operated by TEXTRON AVIATION INC

Hex
A27A83
Octal
50475203
Decimal
10,648,195
Country
US
Tail
N259SF
Type
C172
No current signal · last broadcast 5d ago
Flights observed
205
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A27A83.

Country allocation

The ICAO 24-bit address A27A83 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
N259SF - 205 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 N259SF BJC → BJC Jul 8, 23:50 UTCJul 9, 00:40 UTC50m
2026-07-08 N259SF BJC → BJC Jul 8, 17:30 UTCJul 8, 18:35 UTC1h 5m
2026-07-08 N259SF BJC → BJC Jul 8, 15:00 UTCJul 8, 16:15 UTC1h 15m
2026-07-08 N259SF BJC → BJC Jul 8, 12:35 UTCJul 8, 13:50 UTC1h 15m
2026-07-07 N259SF BJC → BJC Jul 7, 18:25 UTCJul 7, 19:15 UTC50m
2026-07-07 N259SF BJC → BJC Jul 7, 15:00 UTCJul 7, 16:15 UTC1h 15m
2026-07-06 N259SF BJC → BJC Jul 6, 23:05 UTCJul 7, 00:10 UTC1h 5m
2026-07-06 N259SF BJC → BJC Jul 6, 21:10 UTCJul 6, 22:05 UTC55m
2026-06-23 N259SF BJC → BJC Jun 23, 23:19 UTCJun 24, 00:40 UTC1h 20m
2026-06-23 N259SF BJC → BJC Jun 23, 19:19 UTCJun 23, 20:59 UTC1h 40m
2026-06-23 N259SF - Jun 23, 17:25 UTCJun 23, 18:14 UTC50m
2026-06-23 N259SF BJC → BJC Jun 23, 15:15 UTCJun 23, 16:24 UTC1h 10m
2026-06-23 N259SF BJC → BJC Jun 23, 01:30 UTCJun 23, 02:55 UTC1h 25m
2026-06-22 N259SF BJC → BJC Jun 22, 22:24 UTCJun 22, 23:35 UTC1h 10m
2026-06-22 N259SF BJC → BJC Jun 22, 18:30 UTCJun 22, 19:05 UTC35m
2026-06-22 N259SF BJC → BJC Jun 22, 14:40 UTCJun 22, 16:20 UTC1h 40m
2026-06-21 N259SF BJC → BJC Jun 21, 14:50 UTCJun 21, 15:30 UTC40m
2026-06-20 N259SF BJC → BJC Jun 20, 17:54 UTCJun 20, 19:19 UTC1h 25m
2026-06-19 N259SF BJC → BJC Jun 19, 23:09 UTCJun 20, 00:09 UTC1h 0m
2026-06-19 N259SF BJC → BJC Jun 19, 20:34 UTCJun 19, 21:24 UTC50m
2026-06-19 N259SF BJC → BJC Jun 19, 18:14 UTCJun 19, 19:39 UTC1h 25m
2026-06-19 N259SF BJC → BJC Jun 19, 15:59 UTCJun 19, 17:09 UTC1h 10m
2026-06-19 N259SF BJC → BJC Jun 19, 13:24 UTCJun 19, 14:49 UTC1h 25m
2026-06-19 N259SF - Jun 19, 03:55 UTCJun 19, 04:50 UTC55m
2026-06-19 N259SF - Jun 19, 02:04 UTCJun 19, 02:59 UTC55m
2026-06-18 N259SF BJC → BJC Jun 18, 23:00 UTCJun 18, 23:35 UTC35m
2026-06-18 N259SF BJC → BJC Jun 18, 20:20 UTCJun 18, 21:10 UTC50m
2026-06-18 N259SF - Jun 18, 18:10 UTCJun 18, 18:45 UTC35m
2026-06-18 N259SF BJC → BJC Jun 18, 16:40 UTCJun 18, 17:10 UTC30m
2026-06-18 N259SF BJC → BJC Jun 18, 11:25 UTCJun 18, 13:15 UTC1h 50m
2026-06-17 N259SF BJC → BJC Jun 17, 04:35 UTCJun 17, 06:05 UTC1h 30m
2026-06-16 N259SF - Jun 16, 23:20 UTCJun 17, 00:30 UTC1h 10m
2026-06-16 N259SF - Jun 16, 21:30 UTCJun 16, 22:10 UTC40m
2026-06-16 N259SF BJC → PUB Jun 16, 18:39 UTCJun 16, 20:15 UTC1h 36m
2026-06-16 N259SF BJC → BJC Jun 16, 15:24 UTCJun 16, 16:50 UTC1h 25m
2026-06-16 N259SF BJC → BJC Jun 16, 12:35 UTCJun 16, 14:05 UTC1h 30m
2026-06-16 N259SF BJC → BJC Jun 16, 00:29 UTCJun 16, 02:00 UTC1h 30m
2026-06-15 N259SF BJC → BJC Jun 15, 19:55 UTCJun 15, 21:20 UTC1h 25m
2026-06-15 N259SF BJC → BJC Jun 15, 17:45 UTCJun 15, 18:45 UTC1h 0m
2026-06-15 N259SF - Jun 15, 15:55 UTCJun 15, 16:04 UTC10m
2026-06-15 N259SF - Jun 15, 15:15 UTCJun 15, 15:50 UTC35m
2026-06-15 N259SF BJC → BJC Jun 15, 12:45 UTCJun 15, 13:45 UTC1h 0m
2026-06-14 N259SF - Jun 14, 19:30 UTCJun 14, 20:25 UTC55m
2026-06-14 N259SF - Jun 14, 14:50 UTCJun 14, 15:45 UTC55m
2026-06-14 N259SF BJC → BJC Jun 14, 12:30 UTCJun 14, 13:40 UTC1h 10m
2026-06-13 N259SF BJC → BJC Jun 13, 18:25 UTCJun 13, 19:00 UTC35m
2026-06-13 N259SF BJC → BJC Jun 13, 14:25 UTCJun 13, 15:55 UTC1h 30m
2026-06-12 N259SF BJC → BJC Jun 12, 23:25 UTCJun 13, 00:20 UTC55m
2026-06-12 N259SF BJC → BJC Jun 12, 21:15 UTCJun 12, 21:45 UTC30m
2026-06-12 N259SF BJC → BJC Jun 12, 17:35 UTCJun 12, 19:25 UTC1h 50m

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 N259SF page for operator, model, and routing details .

Mode-S A27A83 frequently asked

What is Mode-S code A27A83?
A27A83 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N259SF.
Where is Mode-S A27A83 registered?
Mode-S code A27A83 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 A27A83 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 A27A83, octal 50475203, decimal 10,648,195.
What flights does A27A83 operate?
Mode-S A27A83 has broadcast 1 distinct callsign, including N259SF.