Apparatus

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sensors Mode-S transponder

7C4BF2

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-PAC · CESSNA 510 Citation Mustang · operated by NAVAIR FLIGHT OPERATIONS PTY LTD

Hex
7C4BF2
Octal
37045762
Decimal
8,145,906
Country
AU
Tail
VH-PAC
Type
C510
Broadcasting now · callsign VHPAC · 13,175 ft
Flights observed
5
Distinct callsigns
2
Country
AU
Last broadcast
1h ago

Current position

7C4BF2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 7C4BF2 falls within the block assigned to Australia (AU) by ICAO Annex 10, Volume III. Every aircraft registered in Australia 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 2 distinct

Callsign Airline Flights Last seen
VHPAC - 4 2026-07-16
PAC - 1 2026-07-12

Recent flights last 5

DateFlightRouteTakeoffLandingDuration
2026-07-16 VHPAC - Jul 16, 05:50 UTCJul 16, 06:10 UTC20m
2026-07-16 VHPAC - Jul 16, 03:15 UTCJul 16, 05:20 UTC2h 5m
2026-07-14 VHPAC - Jul 14, 01:30 UTCJul 14, 02:55 UTC1h 25m
2026-07-13 VHPAC - Jul 13, 06:10 UTCJul 14, 02:55 UTC20h 45m
2026-07-12 PAC - Jul 12, 03:35 UTCJul 12, 04:15 UTC40m

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 VH-PAC page for operator, model, and routing details .

Mode-S 7C4BF2 frequently asked

What is Mode-S code 7C4BF2?
7C4BF2 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-PAC.
Where is Mode-S 7C4BF2 registered?
Mode-S code 7C4BF2 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4BF2 broadcasting right now?
Yes. Mode-S 7C4BF2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4BF2, octal 37045762, decimal 8,145,906.
What flights does 7C4BF2 operate?
Mode-S 7C4BF2 has broadcast 2 distinct callsigns, including VHPAC, PAC.