sensors Mode-S transponder

A9879B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N713EE · operated by TWITCHELL BARRY A, TWITCHELL SHANNON A, TWITCHELL SYDNEY A

Hex
A9879B
Octal
52303633
Decimal
11,110,299
Country
US
Tail
N713EE
No current signal · last broadcast 13d ago
Flights observed
11
Distinct callsigns
1
Country
US
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S A9879B.

Country allocation

The ICAO 24-bit address A9879B 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
N713EE - 11 2026-06-10

Recent flights last 11

DateFlightRouteTakeoffLandingDuration
2026-06-10 N713EE - Jun 10, 15:25 UTCJun 10, 15:50 UTC25m
2026-06-03 N713EE - Jun 3, 17:25 UTCJun 3, 18:10 UTC45m
2026-06-03 N713EE - Jun 3, 14:00 UTCJun 3, 14:40 UTC40m
2026-06-02 N713EE - Jun 2, 15:40 UTCJun 2, 16:05 UTC25m
2026-05-28 N713EE - May 28, 15:20 UTCMay 28, 15:30 UTC10m
2026-05-18 N713EE - May 18, 17:15 UTCMay 18, 18:30 UTC1h 14m
2026-05-17 N713EE - May 17, 15:25 UTCMay 17, 16:20 UTC55m
2026-05-09 N713EE - May 9, 19:40 UTCMay 9, 20:10 UTC30m
2026-04-22 N713EE - Apr 22, 18:40 UTCApr 22, 19:10 UTC30m
2026-04-22 N713EE - Apr 22, 17:10 UTCApr 22, 17:35 UTC25m
2026-04-20 N713EE - Apr 20, 13:15 UTCApr 20, 13:35 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 N713EE page for operator, model, and routing details .

Mode-S A9879B frequently asked

What is Mode-S code A9879B?
A9879B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N713EE.
Where is Mode-S A9879B registered?
Mode-S code A9879B 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 A9879B broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9879B, octal 52303633, decimal 11,110,299.
What flights does A9879B operate?
Mode-S A9879B has broadcast 1 distinct callsign, including N713EE.