Apparatus

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sensors Mode-S transponder

A691DD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N522RK · CIRRUS SR-22T Turbo · operated by MONEY 2 NOISE LLC

Hex
A691DD
Octal
51510735
Decimal
10,916,317
Country
US
Tail
N522RK
Type
S22T
No current signal · last broadcast 15h ago
Flights observed
111
Distinct callsigns
2
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A691DD.

Country allocation

The ICAO 24-bit address A691DD 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 2 distinct

Callsign Airline Flights Last seen
N522RK - 108 2026-07-23
NGF6113 - 3 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N522RK - Jul 23, 15:40 UTCJul 23, 16:00 UTC20m
2026-07-23 N522RK - Jul 23, 14:40 UTCJul 23, 15:00 UTC20m
2026-07-23 N522RK - Jul 23, 00:40 UTCJul 23, 00:55 UTC15m
2026-07-22 N522RK - Jul 22, 21:25 UTCJul 22, 21:45 UTC20m
2026-07-19 N522RK - Jul 19, 16:15 UTCJul 19, 16:35 UTC20m
2026-07-19 N522RK - Jul 19, 15:00 UTCJul 19, 15:25 UTC25m
2026-07-11 N522RK - Jul 11, 16:25 UTCJul 11, 16:40 UTC15m
2026-07-11 N522RK - Jul 11, 12:40 UTCJul 11, 13:00 UTC20m
2026-07-10 N522RK - Jul 10, 03:10 UTCJul 10, 04:25 UTC1h 15m
2026-07-10 N522RK - Jul 10, 01:25 UTCJul 10, 01:45 UTC20m
2026-07-09 N522RK - Jul 9, 22:35 UTCJul 9, 22:55 UTC20m
2026-07-06 N522RK - Jul 6, 21:35 UTCJul 6, 23:30 UTC1h 55m
2026-07-06 N522RK - Jul 6, 14:25 UTCJul 6, 16:20 UTC1h 55m
2026-07-04 N522RK - Jul 4, 03:20 UTCJul 4, 03:45 UTC25m
2026-07-03 N522RK - Jul 3, 14:05 UTCJul 3, 14:30 UTC25m
2026-07-02 N522RK - Jul 2, 18:35 UTCJul 2, 18:50 UTC15m
2026-07-02 N522RK - Jul 2, 17:25 UTCJul 2, 17:45 UTC20m
2026-07-01 N522RK - Jul 1, 00:15 UTCJul 1, 00:35 UTC20m
2026-06-30 N522RK - Jun 30, 21:55 UTCJun 30, 22:25 UTC30m
2026-06-30 N522RK - Jun 30, 01:14 UTCJun 30, 01:35 UTC21m
2026-06-29 N522RK - Jun 29, 23:19 UTCJun 29, 23:54 UTC35m
2026-06-28 N522RK - Jun 28, 23:54 UTCJun 29, 00:14 UTC20m
2026-06-28 N522RK - Jun 28, 21:55 UTCJun 28, 22:15 UTC20m
2026-06-27 N522RK - Jun 27, 16:24 UTCJun 27, 16:49 UTC25m
2026-06-27 N522RK - Jun 27, 15:14 UTCJun 27, 15:34 UTC20m
2026-06-24 N522RK - Jun 24, 23:50 UTCJun 25, 00:14 UTC25m
2026-06-24 N522RK - Jun 24, 22:19 UTCJun 24, 22:39 UTC20m
2026-06-24 N522RK - Jun 24, 00:34 UTCJun 24, 00:55 UTC20m
2026-06-23 N522RK - Jun 23, 22:10 UTCJun 23, 23:00 UTC50m
2026-06-22 N522RK - Jun 22, 01:49 UTCJun 22, 02:10 UTC20m
2026-06-22 N522RK - Jun 22, 00:20 UTCJun 22, 00:50 UTC30m
2026-06-21 N522RK - Jun 21, 19:20 UTCJun 21, 21:39 UTC2h 20m
2026-06-21 N522RK - Jun 21, 16:04 UTCJun 21, 17:20 UTC1h 15m
2026-06-21 N522RK - Jun 21, 14:40 UTCJun 21, 15:09 UTC30m
2026-06-19 N522RK - Jun 19, 19:49 UTCJun 19, 23:00 UTC3h 10m
2026-06-19 N522RK - Jun 19, 16:04 UTCJun 19, 16:29 UTC25m
2026-06-19 N522RK - Jun 19, 14:49 UTCJun 19, 15:09 UTC20m
2026-06-19 N522RK - Jun 19, 00:34 UTCJun 19, 00:55 UTC20m
2026-06-16 N522RK - Jun 16, 02:24 UTCJun 16, 02:40 UTC15m
2026-06-15 N522RK - Jun 15, 21:55 UTCJun 15, 22:10 UTC15m
2026-06-14 N522RK - Jun 14, 17:30 UTCJun 14, 17:50 UTC20m
2026-06-14 N522RK - Jun 14, 15:00 UTCJun 14, 15:20 UTC20m
2026-06-13 N522RK - Jun 13, 18:10 UTCJun 13, 18:30 UTC20m
2026-06-13 N522RK - Jun 13, 17:00 UTCJun 13, 17:20 UTC20m
2026-06-10 N522RK - Jun 10, 20:35 UTCJun 10, 20:55 UTC20m
2026-06-10 N522RK - Jun 10, 18:45 UTCJun 10, 19:05 UTC20m
2026-06-10 N522RK - Jun 10, 00:15 UTCJun 10, 00:35 UTC20m
2026-06-09 N522RK - Jun 9, 22:10 UTCJun 9, 22:30 UTC20m
2026-06-07 N522RK - Jun 7, 16:30 UTCJun 7, 16:50 UTC20m
2026-06-07 N522RK - Jun 7, 15:15 UTCJun 7, 15:35 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 N522RK page for operator, model, and routing details .

Mode-S A691DD frequently asked

What is Mode-S code A691DD?
A691DD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N522RK.
Where is Mode-S A691DD registered?
Mode-S code A691DD 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 A691DD broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A691DD, octal 51510735, decimal 10,916,317.
What flights does A691DD operate?
Mode-S A691DD has broadcast 2 distinct callsigns, including N522RK, NGF6113.