Apparatus

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sensors Mode-S transponder

4D243C

ICAO 24-bit transponder address

Currently assigned to 9H-VCS · BOMBARDIER BD-100 Challenger 350

Hex
4D243C
Octal
23222074
Decimal
5,055,548
Tail
9H-VCS
Type
CL35
Broadcasting now · callsign VJT451 · 22,325 ft
Flights observed
103
Distinct callsigns
2
Country
-
Last broadcast
4d ago

Current position

4D243C is currently broadcasting. Map zoomed to live position.

Callsign history 2 distinct

Callsign Airline Flights Last seen
VJT451 - 101 2026-07-25
VJT369K - 2 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 VJT451 - Jul 25, 16:00 UTCJul 25, 20:00 UTC4h 0m
2026-07-25 VJT451 - Jul 25, 11:50 UTCJul 25, 12:40 UTC50m
2026-07-25 VJT451 ZRH → RTM Jul 25, 09:20 UTCJul 25, 10:20 UTC1h 0m
2026-07-24 VJT451 - Jul 24, 08:10 UTCJul 24, 10:45 UTC2h 35m
2026-07-24 VJT451 - Jul 24, 06:15 UTCJul 24, 07:05 UTC50m
2026-07-23 VJT451 - Jul 23, 15:15 UTCJul 23, 16:45 UTC1h 30m
2026-07-23 VJT451 - Jul 23, 11:00 UTCJul 23, 12:20 UTC1h 20m
2026-07-23 VJT451 GVA → BRN Jul 23, 08:25 UTCJul 23, 08:50 UTC25m
2026-07-23 VJT451 - Jul 23, 06:15 UTCJul 23, 07:00 UTC45m
2026-07-22 VJT451 - Jul 22, 12:50 UTCJul 22, 13:40 UTC50m
2026-07-22 VJT451 - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-21 VJT451 IBZ → LBG Jul 21, 16:55 UTCJul 21, 18:35 UTC1h 40m
2026-07-21 VJT451 OLB → IBZ Jul 21, 14:25 UTCJul 21, 15:40 UTC1h 15m
2026-07-20 VJT451 - Jul 20, 22:30 UTCJul 20, 22:50 UTC20m
2026-07-20 VJT451 - Jul 20, 19:30 UTCJul 20, 21:15 UTC1h 45m
2026-07-20 VJT451 ATH → OPO Jul 20, 13:25 UTCJul 20, 17:35 UTC4h 10m
2026-07-20 VJT451 LCA → ATH Jul 20, 09:30 UTCJul 20, 10:55 UTC1h 25m
2026-07-19 VJT451 - Jul 19, 07:55 UTCJul 19, 08:35 UTC40m
2026-07-19 VJT451 JMK → TLV Jul 19, 05:30 UTCJul 19, 06:55 UTC1h 25m
2026-07-19 VJT451 - Jul 19, 04:05 UTCJul 19, 04:25 UTC20m
2026-07-18 VJT451 - Jul 18, 12:00 UTCJul 18, 12:25 UTC25m
2026-07-18 VJT451 ATH → PAS Jul 18, 10:15 UTCJul 18, 10:35 UTC20m
2026-07-18 VJT451 - Jul 18, 07:35 UTCJul 18, 08:10 UTC35m
2026-07-17 VJT451 - Jul 17, 12:35 UTCJul 17, 14:55 UTC2h 20m
2026-07-17 VJT451 - Jul 17, 08:49 UTCJul 17, 09:55 UTC1h 5m
2026-07-17 VJT451 GVA → BFS Jul 17, 05:50 UTCJul 17, 07:50 UTC2h 0m
2026-07-16 VJT451 NQY → GVA Jul 16, 11:54 UTCJul 16, 13:25 UTC1h 30m
2026-07-16 VJT451 ZRH → NQY Jul 16, 07:20 UTCJul 16, 09:05 UTC1h 45m
2026-07-15 VJT451 NCE → ZRH Jul 15, 11:55 UTCJul 15, 13:05 UTC1h 10m
2026-07-15 VJT451 MXP → NCE Jul 15, 09:25 UTCJul 15, 10:05 UTC40m
2026-07-15 VJT451 - Jul 15, 06:20 UTCJul 15, 07:25 UTC1h 5m
2026-07-15 VJT451 - Jul 15, 03:55 UTCJul 15, 04:45 UTC50m
2026-07-11 VJT451 AHO → LIN Jul 11, 16:45 UTCJul 11, 17:35 UTC50m
2026-07-11 VJT451 - Jul 11, 13:25 UTCJul 11, 15:20 UTC1h 55m
2026-07-11 VJT451 - Jul 11, 11:00 UTCJul 11, 11:35 UTC35m
2026-07-11 VJT451 - Jul 11, 08:45 UTCJul 11, 09:50 UTC1h 5m
2026-07-11 VJT451 - Jul 11, 05:20 UTCJul 11, 06:50 UTC1h 30m
2026-07-10 VJT451 - Jul 10, 12:30 UTCJul 10, 14:10 UTC1h 40m
2026-07-10 VJT451 - Jul 10, 09:20 UTCJul 10, 10:20 UTC1h 0m
2026-07-10 VJT451 - Jul 10, 07:10 UTCJul 10, 08:20 UTC1h 10m
2026-07-10 VJT451 GRZ → SOU Jul 10, 04:10 UTCJul 10, 06:15 UTC2h 5m
2026-07-09 VJT451 - Jul 9, 12:15 UTCJul 9, 12:50 UTC35m
2026-07-09 VJT451 - Jul 9, 03:55 UTCJul 9, 06:35 UTC2h 40m
2026-07-08 VJT451 - Jul 8, 13:30 UTCJul 8, 13:45 UTC15m
2026-07-08 VJT451 WAW → RHO Jul 8, 09:50 UTCJul 8, 12:15 UTC2h 25m
2026-07-08 VJT451 - Jul 8, 06:05 UTCJul 8, 08:00 UTC1h 55m
2026-07-05 VJT451 DBV → LBG Jul 5, 12:45 UTCJul 5, 14:55 UTC2h 10m
2026-07-05 VJT451 - Jul 5, 10:00 UTCJul 5, 10:55 UTC55m
2026-07-05 VJT451 - Jul 5, 08:10 UTCJul 5, 08:55 UTC45m
2026-07-03 VJT451 - Jul 3, 17:05 UTCJul 3, 18:15 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 9H-VCS page for operator, model, and routing details .

Mode-S 4D243C frequently asked

What is Mode-S code 4D243C?
4D243C is an ICAO 24-bit transponder address. Assigned to 9H-VCS.
Is 4D243C broadcasting right now?
Yes. Mode-S 4D243C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D243C, octal 23222074, decimal 5,055,548.
What flights does 4D243C operate?
Mode-S 4D243C has broadcast 2 distinct callsigns, including VJT451, VJT369K.