sensors Mode-S transponder

A90BB9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N682MA · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A90BB9
Octal
52205671
Decimal
11,078,585
Country
US
Tail
N682MA
Type
C172
No current signal · last broadcast 12h ago
Flights observed
6
Distinct callsigns
1
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A90BB9.

Country allocation

The ICAO 24-bit address A90BB9 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
N682MA - 6 2026-04-14

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-14 N682MA - Apr 14, 10:35 UTCApr 14, 11:05 UTC30m
2026-04-13 N682MA TTN → TTN Apr 13, 21:35 UTCApr 13, 22:10 UTC35m
2026-04-13 N682MA - Apr 13, 00:20 UTCApr 13, 01:35 UTC1h 15m
2026-04-13 N682MA - Apr 13, 00:10 UTCApr 13, 01:35 UTC1h 25m
2026-04-12 N682MA - Apr 12, 20:00 UTCApr 12, 20:15 UTC15m
2026-04-12 N682MA - Apr 12, 17:15 UTCApr 12, 18:20 UTC1h 5m

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 N682MA page for operator, model, and routing details .

Mode-S A90BB9 frequently asked

What is Mode-S code A90BB9?
A90BB9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N682MA.
Where is Mode-S A90BB9 registered?
Mode-S code A90BB9 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 A90BB9 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A90BB9, octal 52205671, decimal 11,078,585.
What flights does A90BB9 operate?
Mode-S A90BB9 has broadcast 1 distinct callsign, including N682MA.