Apparatus

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sensors Mode-S transponder

A72C18

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N561R · operated by CLOUD 9 AVIATION HOLDINGS LLC

Hex
A72C18
Octal
51626030
Decimal
10,955,800
Country
US
Tail
N561R
Type
SR20
No current signal · last broadcast 18h ago
Flights observed
58
Distinct callsigns
1
Country
US
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S A72C18.

Country allocation

The ICAO 24-bit address A72C18 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
N561R - 58 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 N561R - Jul 19, 15:00 UTCJul 19, 19:20 UTC4h 20m
2026-07-19 N561R - Jul 19, 09:50 UTCJul 19, 13:50 UTC4h 0m
2026-07-18 N561R - Jul 18, 15:25 UTCJul 18, 16:00 UTC35m
2026-07-18 N561R LNA → LNA Jul 18, 12:20 UTCJul 18, 13:45 UTC1h 25m
2026-07-17 N561R LNA → LNA Jul 17, 19:49 UTCJul 17, 20:00 UTC10m
2026-07-17 N561R LNA → LNA Jul 17, 19:35 UTCJul 17, 19:45 UTC10m
2026-07-17 N561R LNA → LNA Jul 17, 18:50 UTCJul 17, 19:30 UTC40m
2026-07-16 N561R - Jul 16, 21:50 UTCJul 16, 22:30 UTC40m
2026-07-16 N561R - Jul 16, 18:10 UTCJul 16, 18:29 UTC20m
2026-07-16 N561R - Jul 16, 16:09 UTCJul 16, 16:15 UTC5m
2026-07-16 N561R LNA → LNA Jul 16, 15:05 UTCJul 16, 15:45 UTC40m
2026-07-15 N561R - Jul 15, 20:50 UTCJul 15, 21:10 UTC20m
2026-07-15 N561R LNA → LNA Jul 15, 20:35 UTCJul 15, 20:40 UTC5m
2026-07-14 N561R LNA → LNA Jul 14, 15:30 UTCJul 14, 16:15 UTC45m
2026-07-13 N561R LNA → LNA Jul 13, 20:45 UTCJul 13, 21:05 UTC20m
2026-07-13 N561R LNA → LNA Jul 13, 20:35 UTCJul 13, 20:40 UTC5m
2026-07-13 N561R LNA → LNA Jul 13, 18:20 UTCJul 13, 18:50 UTC30m
2026-07-13 N561R LNA → LNA Jul 13, 14:25 UTCJul 13, 15:00 UTC35m
2026-07-12 N561R - Jul 12, 20:25 UTCJul 12, 21:20 UTC55m
2026-07-10 N561R - Jul 10, 13:10 UTCJul 10, 13:35 UTC25m
2026-07-09 N561R - Jul 9, 16:55 UTCJul 9, 18:05 UTC1h 10m
2026-07-09 N561R - Jul 9, 13:25 UTCJul 9, 14:00 UTC35m
2026-06-30 N561R - Jun 30, 21:40 UTCJun 30, 22:25 UTC45m
2026-06-30 N561R LNA → MLB Jun 30, 19:50 UTCJun 30, 20:55 UTC1h 5m
2026-06-29 N561R LNA → LNA Jun 29, 14:09 UTCJun 29, 14:44 UTC35m
2026-06-27 N561R - Jun 27, 19:45 UTCJun 27, 19:55 UTC10m
2026-06-27 N561R - Jun 27, 18:54 UTCJun 27, 19:09 UTC15m
2026-06-25 N561R LNA → LNA Jun 25, 14:14 UTCJun 25, 14:55 UTC40m
2026-06-24 N561R - Jun 24, 16:40 UTCJun 24, 17:45 UTC1h 5m
2026-06-24 N561R - Jun 24, 12:50 UTCJun 24, 13:44 UTC55m
2026-06-23 N561R - Jun 23, 20:04 UTCJun 23, 21:10 UTC1h 5m
2026-06-23 N561R - Jun 23, 16:35 UTCJun 23, 18:10 UTC1h 35m
2026-06-20 N561R - Jun 20, 16:44 UTCJun 20, 17:54 UTC1h 10m
2026-06-20 N561R - Jun 20, 14:09 UTCJun 20, 15:29 UTC1h 20m
2026-06-20 N561R - Jun 20, 10:49 UTCJun 20, 13:09 UTC2h 20m
2026-06-19 N561R - Jun 19, 17:04 UTCJun 19, 17:19 UTC15m
2026-06-17 N561R LNA → LNA Jun 17, 18:50 UTCJun 17, 20:00 UTC1h 10m
2026-06-10 N561R LNA → LNA Jun 10, 19:25 UTCJun 10, 20:20 UTC55m
2026-06-07 N561R - Jun 7, 17:55 UTCJun 7, 18:40 UTC45m
2026-06-07 N561R LNA → MRK Jun 7, 14:35 UTCJun 7, 15:15 UTC40m
2026-06-07 N561R SPG → LNA Jun 7, 12:20 UTCJun 7, 13:35 UTC1h 15m
2026-06-06 N561R - Jun 6, 19:14 UTCJun 6, 20:19 UTC1h 5m
2026-05-31 N561R - May 31, 18:50 UTCMay 31, 19:00 UTC10m
2026-05-31 N561R - May 31, 17:30 UTCMay 31, 17:40 UTC10m
2026-05-31 N561R ISM → LNA May 31, 14:55 UTCMay 31, 16:15 UTC1h 20m
2026-05-31 N561R LNA → ISM May 31, 13:10 UTCMay 31, 14:10 UTC1h 0m
2026-05-29 N561R LNA → LNA May 29, 17:20 UTCMay 29, 18:10 UTC50m
2026-05-29 N561R - May 29, 15:20 UTCMay 29, 15:30 UTC10m
2026-05-29 N561R - May 29, 14:25 UTCMay 29, 14:45 UTC20m
2026-05-27 N561R LNA → LNA May 27, 23:10 UTCMay 27, 23:35 UTC25m

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 N561R page for operator, model, and routing details .

Mode-S A72C18 frequently asked

What is Mode-S code A72C18?
A72C18 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N561R.
Where is Mode-S A72C18 registered?
Mode-S code A72C18 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 A72C18 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A72C18, octal 51626030, decimal 10,955,800.
What flights does A72C18 operate?
Mode-S A72C18 has broadcast 1 distinct callsign, including N561R.