Apparatus

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sensors Mode-S transponder

ADBB6F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N984QS · operated by TEXTRON AVIATION INC

Hex
ADBB6F
Octal
53335557
Decimal
11,385,711
Country
US
Tail
N984QS
Type
C68A
No current signal · last broadcast 1d ago
Flights observed
8
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S ADBB6F.

Country allocation

The ICAO 24-bit address ADBB6F 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
EJA984 NetJets 8 2026-04-13

Recent flights last 8

DateFlightRouteTakeoffLandingDuration
2026-04-13 EJA984 IAD → BWI Apr 13, 16:15 UTCApr 13, 17:40 UTC1h 25m
2026-04-13 EJA984 IAD → BWI Apr 13, 15:50 UTCApr 13, 17:40 UTC1h 50m
2026-04-13 EJA984 IAD → BWI Apr 13, 15:00 UTCApr 13, 16:15 UTC1h 15m
2026-04-13 EJA984 IAD → BWI Apr 13, 11:55 UTCApr 13, 12:15 UTC20m
2026-04-13 EJA984 IAD → BWI Apr 13, 09:50 UTCApr 13, 12:15 UTC2h 25m
2026-04-13 EJA984 IAD → BWI Apr 13, 01:45 UTCApr 13, 03:10 UTC1h 25m
2026-04-13 EJA984 IAD → BWI Apr 13, 00:25 UTCApr 13, 01:05 UTC40m
2026-04-12 EJA984 IAD → BWI Apr 12, 18:45 UTCApr 12, 19:40 UTC55m

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 N984QS page for operator, model, and routing details .

Mode-S ADBB6F frequently asked

What is Mode-S code ADBB6F?
ADBB6F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N984QS.
Where is Mode-S ADBB6F registered?
Mode-S code ADBB6F 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 ADBB6F broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADBB6F, octal 53335557, decimal 11,385,711.
What flights does ADBB6F operate?
Mode-S ADBB6F has broadcast 1 distinct callsign, including EJA984.