Apparatus

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sensors Mode-S transponder

A9EDE7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N739QQ · CESSNA 172 Skyhawk · operated by BELLINGHAM AVIATION SERVICES LLC

Hex
A9EDE7
Octal
52366747
Decimal
11,136,487
Country
US
Tail
N739QQ
Type
C172
No current signal · last broadcast 9h ago
Flights observed
18
Distinct callsigns
1
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A9EDE7.

Country allocation

The ICAO 24-bit address A9EDE7 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
N739QQ - 18 2026-06-17

Recent flights last 18

DateFlightRouteTakeoffLandingDuration
2026-06-17 N739QQ - Jun 17, 22:05 UTCJun 17, 22:45 UTC40m
2026-06-17 N739QQ BLI → BLI Jun 17, 19:50 UTCJun 17, 20:50 UTC1h 0m
2026-06-17 N739QQ BLI → BLI Jun 17, 17:10 UTCJun 17, 18:20 UTC1h 10m
2026-06-17 N739QQ - Jun 17, 00:55 UTCJun 17, 01:30 UTC35m
2026-06-16 N739QQ BLI → BLI Jun 16, 22:45 UTCJun 16, 23:45 UTC1h 0m
2026-06-16 N739QQ BLI → BLI Jun 16, 20:55 UTCJun 16, 21:35 UTC40m
2026-06-16 N739QQ BLI → BLI Jun 16, 19:15 UTCJun 16, 20:15 UTC1h 1m
2026-06-16 N739QQ BLI → BLI Jun 16, 00:05 UTCJun 16, 00:55 UTC50m
2026-06-15 N739QQ BLI → BLI Jun 15, 19:25 UTCJun 15, 19:55 UTC30m
2026-06-15 N739QQ BLI → BLI Jun 15, 17:40 UTCJun 15, 18:50 UTC1h 10m
2026-06-14 N739QQ BLI → BLI Jun 14, 18:55 UTCJun 14, 19:50 UTC55m
2026-06-13 N739QQ - Jun 13, 18:05 UTCJun 13, 18:45 UTC40m
2026-06-13 N739QQ - Jun 13, 00:25 UTCJun 13, 01:00 UTC35m
2026-06-12 N739QQ - Jun 12, 22:35 UTCJun 12, 23:45 UTC1h 10m
2026-06-12 N739QQ BLI → BLI Jun 12, 20:50 UTCJun 12, 21:30 UTC40m
2026-06-12 N739QQ BLI → BLI Jun 12, 17:50 UTCJun 12, 18:50 UTC1h 0m
2026-06-12 N739QQ - Jun 12, 16:35 UTCJun 12, 16:50 UTC15m
2026-06-11 N739QQ BLI → BLI Jun 11, 22:05 UTCJun 11, 22:50 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 N739QQ page for operator, model, and routing details .

Mode-S A9EDE7 frequently asked

What is Mode-S code A9EDE7?
A9EDE7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N739QQ.
Where is Mode-S A9EDE7 registered?
Mode-S code A9EDE7 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 A9EDE7 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9EDE7, octal 52366747, decimal 11,136,487.
What flights does A9EDE7 operate?
Mode-S A9EDE7 has broadcast 1 distinct callsign, including N739QQ.