Apparatus

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sensors Mode-S transponder

A8B804

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N661AV · operated by CIRRUS DESIGN CORP

Hex
A8B804
Octal
52134004
Decimal
11,057,156
Country
US
Tail
N661AV
Type
SR20
No current signal · last broadcast 21h ago
Flights observed
200
Distinct callsigns
1
Country
US
Last broadcast
21h ago

Last known position

Most recent position reported by Mode-S A8B804.

Country allocation

The ICAO 24-bit address A8B804 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
VAR661 - 200 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 VAR661 GYR → GYR Jul 13, 16:30 UTCJul 13, 18:10 UTC1h 40m
2026-07-13 VAR661 GYR → GYR Jul 13, 12:45 UTCJul 13, 15:00 UTC2h 15m
2026-07-12 VAR661 - Jul 12, 22:55 UTCJul 13, 00:25 UTC1h 30m
2026-07-12 VAR661 GYR → GYR Jul 12, 14:45 UTCJul 12, 14:55 UTC10m
2026-07-11 VAR661 GYR → GYR Jul 11, 21:05 UTCJul 11, 21:40 UTC35m
2026-07-11 VAR661 GYR → GYR Jul 11, 17:15 UTCJul 11, 19:50 UTC2h 35m
2026-07-11 VAR661 GYR → GYR Jul 11, 13:50 UTCJul 11, 15:50 UTC2h 0m
2026-07-10 VAR661 GYR → GYR Jul 10, 22:25 UTCJul 11, 00:05 UTC1h 40m
2026-07-10 VAR661 GYR → GYR Jul 10, 18:00 UTCJul 10, 19:55 UTC1h 55m
2026-07-10 VAR661 GYR → GYR Jul 10, 15:10 UTCJul 10, 16:50 UTC1h 40m
2026-07-09 VAR661 GYR → GYR Jul 9, 18:55 UTCJul 9, 20:15 UTC1h 20m
2026-07-09 VAR661 GYR → GYR Jul 9, 15:25 UTCJul 9, 17:10 UTC1h 45m
2026-07-09 VAR661 - Jul 9, 05:35 UTCJul 9, 06:35 UTC1h 0m
2026-07-09 VAR661 - Jul 9, 03:50 UTCJul 9, 04:40 UTC50m
2026-07-09 VAR661 - Jul 9, 00:30 UTCJul 9, 00:55 UTC25m
2026-07-08 VAR661 - Jul 8, 22:20 UTCJul 8, 23:50 UTC1h 30m
2026-07-08 VAR661 GYR → GYR Jul 8, 18:40 UTCJul 8, 19:40 UTC1h 0m
2026-07-08 VAR661 GYR → GYR Jul 8, 15:35 UTCJul 8, 17:40 UTC2h 5m
2026-07-08 VAR661 GYR → GYR Jul 8, 01:50 UTCJul 8, 03:30 UTC1h 40m
2026-07-07 VAR661 GYR → GYR Jul 7, 22:35 UTCJul 8, 00:10 UTC1h 35m
2026-07-07 VAR661 GYR → GYR Jul 7, 18:15 UTCJul 7, 20:10 UTC1h 55m
2026-07-06 VAR661 GYR → GYR Jul 6, 22:05 UTCJul 6, 23:15 UTC1h 10m
2026-07-06 VAR661 GYR → GYR Jul 6, 19:35 UTCJul 6, 20:40 UTC1h 5m
2026-07-06 VAR661 GYR → GYR Jul 6, 17:50 UTCJul 6, 18:00 UTC10m
2026-07-06 VAR661 GYR → GYR Jul 6, 16:40 UTCJul 6, 17:45 UTC1h 5m
2026-07-03 VAR661 - Jul 3, 03:30 UTCJul 3, 05:35 UTC2h 5m
2026-07-03 VAR661 - Jul 3, 01:30 UTCJul 3, 03:25 UTC1h 55m
2026-07-02 VAR661 GYR → GYR Jul 2, 17:25 UTCJul 2, 19:25 UTC2h 0m
2026-07-02 VAR661 - Jul 2, 13:40 UTCJul 2, 15:55 UTC2h 15m
2026-07-02 VAR661 - Jul 2, 01:35 UTCJul 2, 03:20 UTC1h 45m
2026-07-01 VAR661 GYR → GYR Jul 1, 20:05 UTCJul 1, 21:35 UTC1h 30m
2026-07-01 VAR661 GYR → GYR Jul 1, 15:40 UTCJul 1, 16:55 UTC1h 15m
2026-07-01 VAR661 - Jul 1, 01:40 UTCJul 1, 03:30 UTC1h 50m
2026-06-30 VAR661 GYR → RAL Jun 30, 22:20 UTCJul 1, 00:35 UTC2h 15m
2026-06-30 VAR661 GYR → GYR Jun 30, 18:30 UTCJun 30, 20:25 UTC1h 55m
2026-06-30 VAR661 GYR → GYR Jun 30, 14:30 UTCJun 30, 16:40 UTC2h 10m
2026-06-29 VAR661 - Jun 29, 23:54 UTCJun 30, 01:55 UTC2h 1m
2026-06-29 VAR661 GYR → GYR Jun 29, 18:30 UTCJun 29, 19:39 UTC1h 10m
2026-06-29 VAR661 GYR → GYR Jun 29, 14:50 UTCJun 29, 16:04 UTC1h 15m
2026-06-29 VAR661 - Jun 29, 04:50 UTCJun 29, 05:00 UTC10m
2026-06-29 VAR661 - Jun 29, 03:54 UTCJun 29, 04:34 UTC40m
2026-06-29 VAR661 - Jun 29, 01:29 UTCJun 29, 02:30 UTC1h 0m
2026-06-28 VAR661 GYR → GYR Jun 28, 17:50 UTCJun 28, 19:44 UTC1h 55m
2026-06-28 VAR661 GYR → GYR Jun 28, 14:14 UTCJun 28, 16:09 UTC1h 55m
2026-06-27 VAR661 GYR → GYR Jun 27, 17:29 UTCJun 27, 19:15 UTC1h 45m
2026-06-26 VAR661 - Jun 26, 17:35 UTCJun 26, 19:14 UTC1h 40m
2026-06-26 VAR661 GYR → GYR Jun 26, 12:44 UTCJun 26, 14:25 UTC1h 40m
2026-06-26 VAR661 - Jun 26, 00:59 UTCJun 26, 02:40 UTC1h 40m
2026-06-25 VAR661 GYR → GYR Jun 25, 22:29 UTCJun 26, 00:10 UTC1h 40m
2026-06-25 VAR661 GYR → GYR Jun 25, 18:19 UTCJun 25, 19:34 UTC1h 15m

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 N661AV page for operator, model, and routing details .

Mode-S A8B804 frequently asked

What is Mode-S code A8B804?
A8B804 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N661AV.
Where is Mode-S A8B804 registered?
Mode-S code A8B804 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 A8B804 broadcasting right now?
No active broadcast right now. Last signal was 21h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B804, octal 52134004, decimal 11,057,156.
What flights does A8B804 operate?
Mode-S A8B804 has broadcast 1 distinct callsign, including VAR661.