Apparatus

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sensors Mode-S transponder

AC0543

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N874AS · BOMBARDIER Regional Jet CRJ-200 · operated by CORPORATE FLIGHT MANAGEMENT INC DBA, CONTOUR AVIATION

Hex
AC0543
Octal
53002503
Decimal
11,273,539
Country
US
Tail
N874AS
Type
CRJ2
No current signal · last broadcast Jul 26, 22:25 UTC
Flights observed
372
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:25 UTC

Last known position

Most recent position reported by Mode-S AC0543.

Country allocation

The ICAO 24-bit address AC0543 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 20 distinct

Callsign Airline Flights Last seen
VTE3551 Corporate Flight Management 22 2026-07-26
VTE3691 - 20 2026-07-20
VTE3552 - 19 2026-07-26
VTE8874 Corporate Flight Management 18 2026-06-23
VTE3694 - 15 2026-07-20
VTE3695 Corporate Flight Management 14 2026-07-20
VTE3541 Corporate Flight Management 12 2026-07-26
VTE3698 Corporate Flight Management 11 2026-07-25
VTE3542 Corporate Flight Management 11 2026-07-26
VTE3693 - 10 2026-07-20
VTE3692 - 9 2026-07-20
VTE3093 - 9 2026-06-25
VTE3071 - 9 2026-06-15
VTE3051 Corporate Flight Management 9 2026-06-25
VTE3094 Corporate Flight Management 8 2026-06-24
VTE3068 - 8 2026-06-23
VTE3054 - 8 2026-06-23
VTE3046 - 8 2026-07-12
VTE3010 Corporate Flight Management 8 2026-06-10
VTE3092 - 7 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 VTE3551 TBN → DFW Jul 26, 21:15 UTCJul 26, 22:25 UTC1h 10m
2026-07-26 VTE3541 BNA → TBN Jul 26, 19:30 UTCJul 26, 20:15 UTC45m
2026-07-26 VTE3542 TBN → BNA Jul 26, 17:10 UTCJul 26, 18:05 UTC55m
2026-07-26 VTE3552 - Jul 26, 15:25 UTCJul 26, 16:25 UTC1h 0m
2026-07-25 VTE3551 TBN → DFW Jul 25, 21:20 UTCJul 25, 22:20 UTC1h 0m
2026-07-25 VTE3552 - Jul 25, 15:10 UTCJul 25, 16:15 UTC1h 5m
2026-07-25 VUF3791 - Jul 25, 13:00 UTCJul 25, 13:40 UTC40m
2026-07-25 VTE3698 DFW → ELD Jul 25, 00:35 UTCJul 25, 01:10 UTC35m
2026-07-24 VTE3551 TBN → DFW Jul 24, 21:30 UTCJul 24, 22:30 UTC1h 0m
2026-07-24 VTE3541 BNA → TBN Jul 24, 19:35 UTCJul 24, 20:25 UTC50m
2026-07-24 VTE3542 - Jul 24, 17:30 UTCJul 24, 18:20 UTC50m
2026-07-24 VTE3552 - Jul 24, 15:40 UTCJul 24, 16:45 UTC1h 5m
2026-07-23 VTE3551 TBN → DFW Jul 23, 21:30 UTCJul 23, 22:40 UTC1h 10m
2026-07-23 VTE3541 - Jul 23, 19:40 UTCJul 23, 20:25 UTC45m
2026-07-23 VTE3542 - Jul 23, 17:35 UTCJul 23, 18:30 UTC55m
2026-07-23 VTE3552 - Jul 23, 15:45 UTCJul 23, 16:45 UTC1h 0m
2026-07-22 VTE3551 TBN → DFW Jul 22, 21:50 UTCJul 22, 22:55 UTC1h 5m
2026-07-22 VTE3541 - Jul 22, 20:15 UTCJul 22, 21:00 UTC45m
2026-07-22 VTE3542 - Jul 22, 17:55 UTCJul 22, 19:00 UTC1h 5m
2026-07-22 VTE3552 - Jul 22, 16:00 UTCJul 22, 16:55 UTC55m
2026-07-21 VTE3551 - Jul 21, 21:20 UTCJul 21, 22:20 UTC1h 0m
2026-07-21 VTE3552 - Jul 21, 16:25 UTCJul 21, 17:25 UTC1h 0m
2026-07-20 VTE3695 ELD → DFW Jul 20, 21:35 UTCJul 20, 22:15 UTC40m
2026-07-20 VTE3694 - Jul 20, 20:00 UTCJul 20, 20:35 UTC35m
2026-07-20 VTE3693 - Jul 20, 17:30 UTCJul 20, 18:10 UTC40m
2026-07-20 VTE3692 - Jul 20, 16:05 UTCJul 20, 16:40 UTC35m
2026-07-20 VTE3691 - Jul 20, 12:55 UTCJul 20, 13:45 UTC50m
2026-07-20 VTE3698 DFW → ELD Jul 20, 01:00 UTCJul 20, 01:35 UTC35m
2026-07-19 VTE3551 - Jul 19, 22:00 UTCJul 19, 23:15 UTC1h 15m
2026-07-19 VTE3541 - Jul 19, 20:30 UTCJul 19, 21:20 UTC50m
2026-07-19 VTE3542 - Jul 19, 18:25 UTCJul 19, 19:20 UTC55m
2026-07-19 VTE3552 - Jul 19, 16:30 UTCJul 19, 17:30 UTC1h 0m
2026-07-18 VTE3695 ELD → DFW Jul 18, 21:45 UTCJul 18, 22:25 UTC40m
2026-07-18 VTE3694 - Jul 18, 20:10 UTCJul 18, 20:40 UTC30m
2026-07-18 VTE3691 - Jul 18, 12:40 UTCJul 18, 13:20 UTC40m
2026-07-18 VTE3698 DFW → ELD Jul 18, 00:15 UTCJul 18, 00:45 UTC30m
2026-07-17 VTE3551 - Jul 17, 21:15 UTCJul 17, 22:15 UTC1h 0m
2026-07-17 VTE3541 - Jul 17, 19:30 UTCJul 17, 20:10 UTC40m
2026-07-17 VTE3542 - Jul 17, 17:15 UTCJul 17, 18:05 UTC50m
2026-07-17 VTE3552 - Jul 17, 15:29 UTCJul 17, 16:24 UTC55m
2026-07-16 VTE3695 - Jul 16, 22:19 UTCJul 16, 23:05 UTC45m
2026-07-16 VTE3694 - Jul 16, 21:00 UTCJul 16, 21:35 UTC35m
2026-07-16 VTE3693 - Jul 16, 17:20 UTCJul 16, 18:00 UTC40m
2026-07-16 VTE3692 - Jul 16, 15:55 UTCJul 16, 16:30 UTC35m
2026-07-16 VTE3691 - Jul 16, 13:00 UTCJul 16, 13:40 UTC40m
2026-07-16 VTE3698 - Jul 16, 00:15 UTCJul 16, 00:50 UTC35m
2026-07-15 VTE3551 - Jul 15, 21:15 UTCJul 15, 22:55 UTC1h 40m
2026-07-15 VTE3541 - Jul 15, 19:20 UTCJul 15, 20:05 UTC45m
2026-07-15 VTE3542 - Jul 15, 17:25 UTCJul 15, 18:25 UTC1h 0m
2026-07-15 VTE3552 - Jul 15, 15:30 UTCJul 15, 16:35 UTC1h 5m

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 N874AS page for operator, model, and routing details .

Mode-S AC0543 frequently asked

What is Mode-S code AC0543?
AC0543 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N874AS.
Where is Mode-S AC0543 registered?
Mode-S code AC0543 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 AC0543 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC0543, octal 53002503, decimal 11,273,539.
What flights does AC0543 operate?
Mode-S AC0543 has broadcast 20 distinct callsigns, including VTE3551, VTE3691, VTE3552, VTE8874, VTE3694.