Apparatus

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sensors Mode-S transponder

A6918C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N522ND · CESSNA 172 Skyhawk · operated by SPARTAN EDUCATION LLC

Hex
A6918C
Octal
51510614
Decimal
10,916,236
Country
US
Tail
N522ND
Type
C172
No current signal · last broadcast 7h ago
Flights observed
69
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A6918C.

Country allocation

The ICAO 24-bit address A6918C 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
N522ND - 69 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 N522ND BJC → BJC Jun 2, 17:55 UTCJun 2, 18:30 UTC35m
2026-06-02 N522ND BJC → BJC Jun 2, 13:35 UTCJun 2, 15:00 UTC1h 25m
2026-06-01 N522ND BJC → BJC Jun 1, 17:45 UTCJun 1, 18:50 UTC1h 5m
2026-05-30 N522ND BJC → BJC May 30, 13:30 UTCMay 30, 15:45 UTC2h 15m
2026-05-29 N522ND BJC → BJC May 29, 20:35 UTCMay 29, 20:55 UTC20m
2026-05-28 N522ND BJC → BJC May 28, 19:20 UTCMay 28, 20:05 UTC45m
2026-05-28 N522ND BJC → BJC May 28, 16:40 UTCMay 28, 17:30 UTC50m
2026-05-28 N522ND BJC → BJC May 28, 14:05 UTCMay 28, 15:10 UTC1h 5m
2026-05-27 N522ND BJC → BJC May 27, 19:10 UTCMay 27, 20:10 UTC1h 0m
2026-05-27 N522ND BJC → BJC May 27, 16:10 UTCMay 27, 17:50 UTC1h 40m
2026-05-26 N522ND BJC → BJC May 26, 18:50 UTCMay 26, 19:34 UTC45m
2026-05-26 N522ND BJC → BJC May 26, 16:10 UTCMay 26, 17:25 UTC1h 15m
2026-05-26 N522ND BJC → BJC May 26, 13:24 UTCMay 26, 15:00 UTC1h 35m
2026-05-25 N522ND BJC → BJC May 25, 15:50 UTCMay 25, 17:00 UTC1h 10m
2026-05-24 N522ND BJC → BJC May 24, 15:20 UTCMay 24, 16:40 UTC1h 20m
2026-05-21 N522ND BJC → BJC May 21, 12:40 UTCMay 21, 13:50 UTC1h 10m
2026-05-15 N522ND BJC → BJC May 15, 13:00 UTCMay 15, 14:50 UTC1h 49m
2026-05-14 N522ND BJC → BJC May 14, 15:30 UTCMay 14, 16:45 UTC1h 15m
2026-05-14 N522ND BJC → BJC May 14, 13:30 UTCMay 14, 13:55 UTC25m
2026-05-12 N522ND BJC → BJC May 12, 17:25 UTCMay 12, 18:50 UTC1h 25m
2026-05-11 N522ND - May 11, 19:10 UTCMay 11, 20:00 UTC50m
2026-05-11 N522ND - May 11, 17:35 UTCMay 11, 18:25 UTC50m
2026-05-11 N522ND BJC → COS May 11, 16:25 UTCMay 11, 17:25 UTC1h 0m
2026-05-11 N522ND BJC → BJC May 11, 13:40 UTCMay 11, 15:15 UTC1h 35m
2026-05-10 N522ND BJC → BJC May 10, 15:39 UTCMay 10, 17:05 UTC1h 25m
2026-05-10 N522ND BJC → BJC May 10, 13:30 UTCMay 10, 14:34 UTC1h 5m
2026-05-09 N522ND BJC → BJC May 9, 16:15 UTCMay 9, 16:40 UTC25m
2026-05-09 N522ND BJC → BJC May 9, 12:50 UTCMay 9, 14:50 UTC2h 0m
2026-05-08 N522ND BJC → BJC May 8, 21:55 UTCMay 8, 23:05 UTC1h 10m
2026-05-08 N522ND BJC → BJC May 8, 18:05 UTCMay 8, 19:00 UTC55m
2026-05-08 N522ND BJC → BJC May 8, 14:20 UTCMay 8, 16:10 UTC1h 50m
2026-05-07 N522ND BJC → BJC May 7, 23:29 UTCMay 8, 00:34 UTC1h 5m
2026-05-07 N522ND BJC → BJC May 7, 17:45 UTCMay 7, 18:50 UTC1h 5m
2026-05-04 N522ND BJC → BJC May 4, 18:10 UTCMay 4, 19:35 UTC1h 26m
2026-05-04 N522ND FNL → BJC May 4, 16:55 UTCMay 4, 17:20 UTC25m
2026-05-04 N522ND BJC → FNL May 4, 16:15 UTCMay 4, 16:50 UTC35m
2026-05-03 N522ND BJC → BJC May 3, 19:50 UTCMay 3, 21:10 UTC1h 20m
2026-05-03 N522ND - May 3, 18:20 UTCMay 3, 18:25 UTC5m
2026-05-03 N522ND BJC → BJC May 3, 17:10 UTCMay 3, 18:14 UTC1h 5m
2026-05-02 N522ND BJC → BJC May 2, 17:35 UTCMay 2, 18:40 UTC1h 5m
2026-05-02 N522ND BJC → BJC May 2, 13:40 UTCMay 2, 14:40 UTC1h 0m
2026-05-01 N522ND BJC → BJC May 1, 18:25 UTCMay 1, 19:00 UTC35m
2026-05-01 N522ND BJC → BJC May 1, 15:30 UTCMay 1, 17:00 UTC1h 30m
2026-05-01 N522ND BJC → BJC May 1, 12:45 UTCMay 1, 14:00 UTC1h 15m
2026-04-29 N522ND BJC → BJC Apr 29, 18:55 UTCApr 29, 20:25 UTC1h 30m
2026-04-28 N522ND BJC → BJC Apr 28, 20:30 UTCApr 28, 22:40 UTC2h 10m
2026-04-28 N522ND BJC → BJC Apr 28, 15:55 UTCApr 28, 16:00 UTC5m
2026-04-27 N522ND BJC → BJC Apr 27, 20:05 UTCApr 27, 21:00 UTC55m
2026-04-24 N522ND BJC → BJC Apr 24, 18:20 UTCApr 24, 19:30 UTC1h 10m
2026-04-24 N522ND BJC → BJC Apr 24, 16:10 UTCApr 24, 17:20 UTC1h 10m

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 N522ND page for operator, model, and routing details .

Mode-S A6918C frequently asked

What is Mode-S code A6918C?
A6918C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N522ND.
Where is Mode-S A6918C registered?
Mode-S code A6918C 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 A6918C broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6918C, octal 51510614, decimal 10,916,236.
What flights does A6918C operate?
Mode-S A6918C has broadcast 1 distinct callsign, including N522ND.