Apparatus

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sensors Mode-S transponder

7C8221

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ZZN · DE HAVILLAND DHC-8-300 Dash 8 · operated by SURVEILLANCE AUSTRALIA PTY. LTD.

Hex
7C8221
Octal
37101041
Decimal
8,159,777
Country
AU
Tail
VH-ZZN
Type
DH8C
No current signal · last broadcast 22d ago
Flights observed
32
Distinct callsigns
1
Country
AU
Last broadcast
22d ago

Last known position

Most recent position reported by Mode-S 7C8221.

Country allocation

The ICAO 24-bit address 7C8221 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 1 distinct

Callsign Airline Flights Last seen
BDF99 - 32 2026-07-26

Recent flights last 32

DateFlightRouteTakeoffLandingDuration
2026-07-26 BDF99 - Jul 26, 07:15 UTCJul 26, 07:25 UTC10m
2026-07-24 BDF99 - Jul 24, 07:25 UTCJul 24, 07:35 UTC10m
2026-07-21 BDF99 - Jul 21, 09:05 UTCJul 21, 09:15 UTC10m
2026-07-20 BDF99 - Jul 20, 07:40 UTCJul 20, 07:50 UTC10m
2026-07-19 BDF99 - Jul 19, 07:25 UTCJul 19, 07:35 UTC10m
2026-07-18 BDF99 - Jul 18, 08:40 UTCJul 18, 08:50 UTC10m
2026-07-18 BDF99 - Jul 18, 02:29 UTCJul 18, 02:40 UTC10m
2026-07-17 BDF99 - Jul 17, 15:44 UTCJul 17, 15:55 UTC10m
2026-07-17 BDF99 - Jul 17, 10:20 UTCJul 17, 10:30 UTC10m
2026-07-16 BDF99 - Jul 16, 06:35 UTCJul 16, 06:45 UTC10m
2026-07-15 BDF99 - Jul 15, 13:40 UTCJul 15, 14:00 UTC20m
2026-07-15 BDF99 - Jul 15, 08:30 UTCJul 15, 08:40 UTC10m
2026-07-15 BDF99 - Jul 15, 06:20 UTCJul 15, 06:35 UTC15m
2026-07-15 BDF99 - Jul 15, 02:45 UTCJul 15, 02:55 UTC10m
2026-07-14 BDF99 - Jul 14, 11:15 UTCJul 14, 11:25 UTC10m
2026-07-13 BDF99 - Jul 13, 08:25 UTCJul 13, 08:35 UTC10m
2026-07-10 BDF99 - Jul 10, 07:35 UTCJul 10, 07:45 UTC10m
2026-07-07 BDF99 - Jul 7, 13:35 UTCJul 7, 13:45 UTC10m
2026-07-07 BDF99 - Jul 7, 07:25 UTCJul 7, 07:35 UTC10m
2026-07-06 BDF99 - Jul 6, 14:20 UTCJul 6, 14:30 UTC10m
2026-07-06 BDF99 - Jul 6, 09:20 UTCJul 6, 09:30 UTC10m
2026-07-05 BDF99 - Jul 5, 07:55 UTCJul 5, 08:05 UTC10m
2026-07-05 BDF99 - Jul 5, 02:25 UTCJul 5, 02:35 UTC10m
2026-07-04 BDF99 - Jul 4, 14:45 UTCJul 4, 14:55 UTC10m
2026-07-04 BDF99 - Jul 4, 08:50 UTCJul 4, 09:05 UTC15m
2026-07-04 BDF99 - Jul 4, 04:10 UTCJul 4, 04:20 UTC10m
2026-07-03 BDF99 - Jul 3, 08:30 UTCJul 3, 08:40 UTC10m
2026-07-03 BDF99 - Jul 3, 06:25 UTCJul 3, 06:35 UTC10m
2026-07-02 BDF99 - Jul 2, 08:25 UTCJul 2, 08:35 UTC10m
2026-05-07 BDF99 - May 7, 07:55 UTCMay 7, 08:10 UTC15m
2026-04-15 BDF99 - Apr 15, 10:10 UTCApr 15, 10:20 UTC10m
2026-04-14 BDF99 - Apr 14, 21:50 UTCApr 14, 22:00 UTC10m

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-ZZN page for operator, model, and routing details .

Mode-S 7C8221 frequently asked

What is Mode-S code 7C8221?
7C8221 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZZN.
Where is Mode-S 7C8221 registered?
Mode-S code 7C8221 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C8221 broadcasting right now?
No active broadcast right now. Last signal was 22d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C8221, octal 37101041, decimal 8,159,777.
What flights does 7C8221 operate?
Mode-S 7C8221 has broadcast 1 distinct callsign, including BDF99.