Apparatus

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sensors Mode-S transponder

AC7C3F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N903VU · operated by VANDERBILT UNIVERSITY MEDICAL CENTER

Hex
AC7C3F
Octal
53076077
Decimal
11,303,999
Country
US
Tail
N903VU
No current signal · last broadcast 20d ago
Flights observed
18
Distinct callsigns
1
Country
US
Last broadcast
20d ago

Last known position

Most recent position reported by Mode-S AC7C3F.

Country allocation

The ICAO 24-bit address AC7C3F 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
N903VU - 18 2026-07-23

Recent flights last 18

DateFlightRouteTakeoffLandingDuration
2026-07-23 N903VU - Jul 23, 18:00 UTCJul 23, 18:25 UTC25m
2026-07-22 N903VU - Jul 22, 19:30 UTCJul 22, 19:55 UTC25m
2026-07-20 N903VU - Jul 20, 23:25 UTCJul 20, 23:50 UTC25m
2026-07-20 N903VU - Jul 20, 20:15 UTCJul 20, 20:40 UTC25m
2026-07-19 N903VU - Jul 19, 19:25 UTCJul 19, 19:45 UTC20m
2026-07-19 N903VU - Jul 19, 18:25 UTCJul 19, 18:45 UTC20m
2026-07-19 N903VU - Jul 19, 02:10 UTCJul 19, 02:40 UTC30m
2026-07-19 N903VU - Jul 19, 01:15 UTCJul 19, 01:35 UTC20m
2026-07-19 N903VU - Jul 19, 00:50 UTCJul 19, 01:00 UTC10m
2026-07-18 N903VU - Jul 18, 20:25 UTCJul 18, 20:50 UTC25m
2026-07-18 N903VU - Jul 18, 20:10 UTCJul 18, 20:15 UTC5m
2026-07-18 N903VU - Jul 18, 18:40 UTCJul 18, 19:05 UTC25m
2026-07-17 N903VU - Jul 17, 07:14 UTCJul 17, 07:40 UTC25m
2026-07-17 N903VU - Jul 17, 05:45 UTCJul 17, 06:35 UTC50m
2026-07-16 N903VU - Jul 16, 04:30 UTCJul 16, 04:50 UTC20m
2026-07-16 N903VU - Jul 16, 03:35 UTCJul 16, 03:55 UTC20m
2026-07-15 N903VU - Jul 15, 18:25 UTCJul 15, 19:00 UTC35m
2026-07-15 N903VU - Jul 15, 17:10 UTCJul 15, 17:40 UTC30m

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 N903VU page for operator, model, and routing details .

Mode-S AC7C3F frequently asked

What is Mode-S code AC7C3F?
AC7C3F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N903VU.
Where is Mode-S AC7C3F registered?
Mode-S code AC7C3F 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 AC7C3F broadcasting right now?
No active broadcast right now. Last signal was 20d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC7C3F, octal 53076077, decimal 11,303,999.
What flights does AC7C3F operate?
Mode-S AC7C3F has broadcast 1 distinct callsign, including N903VU.