Apparatus

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sensors Mode-S transponder

A7D74B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N604ND · CESSNA 172 Skyhawk · operated by HEAVY METAL AIR LLC

Hex
A7D74B
Octal
51753513
Decimal
10,999,627
Country
US
Tail
N604ND
Type
C172
No current signal · last broadcast 13h ago
Flights observed
179
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A7D74B.

Country allocation

The ICAO 24-bit address A7D74B 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
N604ND - 179 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N604ND - Jul 17, 21:30 UTCJul 17, 22:25 UTC55m
2026-07-17 N604ND - Jul 17, 17:30 UTCJul 17, 18:50 UTC1h 20m
2026-07-17 N604ND - Jul 17, 15:20 UTCJul 17, 16:10 UTC50m
2026-07-15 N604ND - Jul 15, 11:35 UTCJul 15, 12:25 UTC50m
2026-07-14 N604ND FRG → FRG Jul 14, 11:10 UTCJul 14, 14:15 UTC3h 5m
2026-07-13 N604ND FRG → FRG Jul 13, 15:15 UTCJul 13, 16:30 UTC1h 15m
2026-07-13 N604ND HPN → FRG Jul 13, 12:30 UTCJul 13, 13:40 UTC1h 10m
2026-07-13 N604ND - Jul 13, 11:40 UTCJul 13, 12:20 UTC40m
2026-07-12 N604ND - Jul 12, 21:40 UTCJul 12, 22:30 UTC50m
2026-07-12 N604ND - Jul 12, 20:10 UTCJul 12, 20:50 UTC40m
2026-07-12 N604ND FRG → FRG Jul 12, 18:05 UTCJul 12, 18:35 UTC30m
2026-07-12 N604ND - Jul 12, 13:35 UTCJul 12, 15:45 UTC2h 10m
2026-07-11 N604ND FRG → FRG Jul 11, 21:30 UTCJul 11, 22:45 UTC1h 15m
2026-07-11 N604ND - Jul 11, 17:30 UTCJul 11, 18:55 UTC1h 25m
2026-07-11 N604ND FRG → FRG Jul 11, 13:15 UTCJul 11, 14:20 UTC1h 5m
2026-07-10 N604ND - Jul 10, 18:15 UTCJul 10, 19:30 UTC1h 15m
2026-07-10 N604ND - Jul 10, 15:20 UTCJul 10, 16:50 UTC1h 30m
2026-07-10 N604ND FRG → FRG Jul 10, 13:25 UTCJul 10, 14:30 UTC1h 5m
2026-07-09 N604ND - Jul 9, 15:55 UTCJul 9, 16:55 UTC1h 0m
2026-07-09 N604ND FRG → FRG Jul 9, 13:10 UTCJul 9, 14:10 UTC1h 0m
2026-07-08 N604ND FRG → FRG Jul 8, 20:00 UTCJul 8, 21:05 UTC1h 5m
2026-07-08 N604ND - Jul 8, 15:35 UTCJul 8, 16:50 UTC1h 15m
2026-07-08 N604ND FRG → FRG Jul 8, 11:15 UTCJul 8, 12:20 UTC1h 5m
2026-07-05 N604ND - Jul 5, 14:05 UTCJul 5, 14:15 UTC10m
2026-07-04 N604ND - Jul 4, 13:45 UTCJul 4, 14:25 UTC40m
2026-07-03 N604ND - Jul 3, 13:15 UTCJul 3, 14:35 UTC1h 20m
2026-07-02 N604ND - Jul 2, 13:50 UTCJul 2, 14:45 UTC55m
2026-07-02 N604ND - Jul 2, 12:30 UTCJul 2, 13:15 UTC45m
2026-07-01 N604ND FRG → FRG Jul 1, 18:30 UTCJul 1, 20:00 UTC1h 30m
2026-07-01 N604ND - Jul 1, 15:40 UTCJul 1, 16:50 UTC1h 10m
2026-07-01 N604ND FRG → FRG Jul 1, 13:20 UTCJul 1, 14:25 UTC1h 5m
2026-07-01 N604ND - Jul 1, 11:55 UTCJul 1, 12:35 UTC40m
2026-06-27 N604ND - Jun 27, 14:45 UTCJun 27, 16:44 UTC2h 0m
2026-06-27 N604ND - Jun 27, 11:25 UTCJun 27, 14:05 UTC2h 40m
2026-06-26 N604ND - Jun 26, 17:54 UTCJun 26, 18:39 UTC45m
2026-06-26 N604ND - Jun 26, 13:24 UTCJun 26, 14:25 UTC1h 0m
2026-06-25 N604ND FRG → FRG Jun 25, 17:39 UTCJun 25, 18:59 UTC1h 20m
2026-06-25 N604ND FRG → FRG Jun 25, 15:15 UTCJun 25, 16:29 UTC1h 15m
2026-06-24 N604ND - Jun 24, 22:25 UTCJun 24, 23:20 UTC55m
2026-06-24 N604ND FRG → FRG Jun 24, 15:24 UTCJun 24, 17:10 UTC1h 45m
2026-06-22 N604ND - Jun 22, 15:14 UTCJun 22, 16:10 UTC55m
2026-06-21 N604ND FRG → FRG Jun 21, 13:20 UTCJun 21, 14:19 UTC1h 0m
2026-06-21 N604ND - Jun 21, 11:49 UTCJun 21, 12:14 UTC25m
2026-06-17 N604ND FRG → FRG Jun 17, 20:05 UTCJun 17, 21:15 UTC1h 10m
2026-06-17 N604ND FRG → FRG Jun 17, 11:30 UTCJun 17, 12:20 UTC50m
2026-06-16 N604ND - Jun 16, 20:05 UTCJun 16, 21:10 UTC1h 5m
2026-06-16 N604ND - Jun 16, 17:45 UTCJun 16, 19:10 UTC1h 25m
2026-06-16 N604ND - Jun 16, 16:20 UTCJun 16, 17:05 UTC45m
2026-06-16 N604ND - Jun 16, 14:15 UTCJun 16, 14:39 UTC25m
2026-06-16 N604ND - Jun 16, 11:49 UTCJun 16, 13:44 UTC1h 55m

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 N604ND page for operator, model, and routing details .

Mode-S A7D74B frequently asked

What is Mode-S code A7D74B?
A7D74B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N604ND.
Where is Mode-S A7D74B registered?
Mode-S code A7D74B 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 A7D74B broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7D74B, octal 51753513, decimal 10,999,627.
What flights does A7D74B operate?
Mode-S A7D74B has broadcast 1 distinct callsign, including N604ND.