Apparatus

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sensors Mode-S transponder

7C8021

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ZLF · SAAB 340 · operated by REGIONAL EXPRESS PTY LTD

Hex
7C8021
Octal
37100041
Decimal
8,159,265
Country
AU
Tail
VH-ZLF
Type
SF34
No current signal · last broadcast Jul 23, 00:15 UTC
Flights observed
243
Distinct callsigns
20
Country
AU
Last broadcast
Jul 23, 00:15 UTC

Last known position

Most recent position reported by Mode-S 7C8021.

Country allocation

The ICAO 24-bit address 7C8021 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 20 distinct

Callsign Airline Flights Last seen
RXA6469 Regional Express 10 2026-05-25
RXA5631 Regional Express 9 2026-07-21
RXA5722 - 8 2026-06-26
RXA5717 - 8 2026-07-15
RXA5716 - 8 2026-07-15
RXA5662 - 8 2026-07-22
RXA5733 - 7 2026-07-20
RXA5719 - 7 2026-07-20
RXA5718 Regional Express 7 2026-07-19
RXA6463 Regional Express 6 2026-05-26
RXA5742 Regional Express 6 2026-07-21
RXA5732 Regional Express 6 2026-07-20
RXA5632 - 5 2026-07-01
RXA6477 Regional Express 4 2026-05-23
RXA6133 Regional Express 4 2026-05-13
RXA6117 Regional Express 4 2026-05-14
RXA5661 - 4 2026-07-14
RXA4388 Regional Express 4 2026-05-05
RXA3469 Regional Express 4 2026-04-22
RXA6852 Regional Express 3 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 RXA5662 - Jul 22, 23:15 UTCJul 23, 00:15 UTC1h 0m
2026-07-21 RXA5631 BNE → WTB Jul 21, 23:15 UTCJul 21, 23:30 UTC15m
2026-07-21 RXA5631 BNE → WTB Jul 21, 22:15 UTCJul 21, 22:40 UTC25m
2026-07-21 RXA5742 RMA → BNE Jul 21, 08:50 UTCJul 21, 09:35 UTC45m
2026-07-21 RXA5742 RMA → BNE Jul 21, 04:40 UTCJul 21, 05:15 UTC35m
2026-07-20 RXA5733 - Jul 20, 06:15 UTCJul 20, 07:00 UTC45m
2026-07-20 RXA5732 BNE → RMA Jul 20, 04:10 UTCJul 20, 04:45 UTC35m
2026-07-20 RXA5719 - Jul 20, 01:10 UTCJul 20, 02:00 UTC50m
2026-07-19 RXA5718 BNE → RMA Jul 19, 23:05 UTCJul 19, 23:40 UTC35m
2026-07-17 RXA5745 RMA → BNE Jul 17, 08:45 UTCJul 17, 09:30 UTC45m
2026-07-17 RXA5738 BNE → RMA Jul 17, 06:29 UTCJul 17, 07:00 UTC30m
2026-07-17 RXA5727 RMA → BNE Jul 17, 05:04 UTCJul 17, 05:45 UTC40m
2026-07-17 RXA5726 BNE → RMA Jul 17, 02:45 UTCJul 17, 03:20 UTC35m
2026-07-16 RXA5742 - Jul 16, 08:40 UTCJul 16, 09:25 UTC45m
2026-07-16 RXA5742 - Jul 16, 04:40 UTCJul 16, 05:10 UTC30m
2026-07-15 RXA5717 - Jul 15, 23:15 UTCJul 16, 00:00 UTC45m
2026-07-15 RXA5716 - Jul 15, 21:00 UTCJul 15, 21:35 UTC35m
2026-07-15 RXA5733 - Jul 15, 06:20 UTCJul 15, 07:00 UTC40m
2026-07-15 RXA5732 - Jul 15, 04:05 UTCJul 15, 04:40 UTC35m
2026-07-15 RXA5719 - Jul 15, 01:30 UTCJul 15, 02:10 UTC40m
2026-07-14 RXA5718 - Jul 14, 23:10 UTCJul 14, 23:50 UTC40m
2026-07-14 RXA5661 - Jul 14, 06:25 UTCJul 14, 06:55 UTC30m
2026-07-01 RXA5662 - Jul 1, 23:30 UTCJul 1, 23:50 UTC20m
2026-07-01 RXA5662 - Jul 1, 22:10 UTCJul 1, 22:35 UTC25m
2026-07-01 RXA5632 - Jul 1, 05:40 UTCJul 1, 06:55 UTC1h 15m
2026-06-30 RXA5631 - Jun 30, 23:05 UTCJun 30, 23:25 UTC20m
2026-06-30 RXA5631 - Jun 30, 22:10 UTCJun 30, 22:30 UTC20m
2026-06-30 RXA5661 - Jun 30, 06:15 UTCJun 30, 07:25 UTC1h 10m
2026-06-28 RXA5662 - Jun 28, 22:15 UTCJun 28, 23:29 UTC1h 15m
2026-06-27 RXA5719 - Jun 27, 01:39 UTCJun 27, 02:25 UTC45m
2026-06-26 RXA5718 - Jun 26, 23:04 UTCJun 26, 23:44 UTC40m
2026-06-26 RXA5722 - Jun 26, 05:19 UTCJun 26, 06:00 UTC40m
2026-06-26 RXA5722 - Jun 26, 01:20 UTCJun 26, 01:54 UTC35m
2026-06-25 RXA5717 - Jun 25, 23:24 UTCJun 25, 23:59 UTC35m
2026-06-25 RXA5716 - Jun 25, 21:10 UTCJun 25, 21:44 UTC35m
2026-06-24 RXA5717 - Jun 24, 23:14 UTCJun 24, 23:54 UTC40m
2026-06-24 RXA5716 - Jun 24, 21:09 UTCJun 24, 21:44 UTC35m
2026-06-24 RXA5733 - Jun 24, 10:19 UTCJun 24, 10:59 UTC40m
2026-06-24 RXA9924 - Jun 24, 07:34 UTCJun 24, 08:09 UTC35m
2026-06-24 RXA5722 - Jun 24, 05:09 UTCJun 24, 05:44 UTC35m
2026-06-24 RXA5722 - Jun 24, 01:09 UTCJun 24, 01:44 UTC35m
2026-06-23 RXA5717 - Jun 23, 23:24 UTCJun 24, 00:05 UTC40m
2026-06-23 RXA5716 - Jun 23, 21:14 UTCJun 23, 21:49 UTC35m
2026-06-23 RXA5661 - Jun 23, 05:39 UTCJun 23, 06:49 UTC1h 10m
2026-06-21 RXA5662 - Jun 21, 23:00 UTCJun 21, 23:10 UTC10m
2026-06-21 RXA5662 - Jun 21, 22:04 UTCJun 21, 22:24 UTC20m
2026-06-21 RXA5632 - Jun 21, 06:14 UTCJun 21, 07:00 UTC45m
2026-06-20 RXA5631 BNE → WTB Jun 20, 22:10 UTCJun 20, 23:14 UTC1h 5m
2026-06-20 RXA5719 - Jun 20, 01:19 UTCJun 20, 02:04 UTC45m
2026-06-19 RXA5718 - Jun 19, 23:04 UTCJun 19, 23:49 UTC45m

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

Mode-S 7C8021 frequently asked

What is Mode-S code 7C8021?
7C8021 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZLF.
Where is Mode-S 7C8021 registered?
Mode-S code 7C8021 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C8021 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 00:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C8021, octal 37100041, decimal 8,159,265.
What flights does 7C8021 operate?
Mode-S 7C8021 has broadcast 20 distinct callsigns, including RXA6469, RXA5631, RXA5722, RXA5717, RXA5716.