Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

7C81CD

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ZXB · AGUSTA AW-139 · operated by NORTHERN NSW HELICOPTER RESCUE SERVICE LIMITED

Hex
7C81CD
Octal
37100715
Decimal
8,159,693
Country
AU
Tail
VH-ZXB
Type
A139
No current signal · last broadcast 16h ago
Flights observed
14
Distinct callsigns
1
Country
AU
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 7C81CD.

Country allocation

The ICAO 24-bit address 7C81CD 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
WP2 - 14 2026-04-14

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-14 WP2 BEO → BEO Apr 14, 09:35 UTCApr 14, 10:10 UTC35m
2026-04-14 WP2 - Apr 14, 08:55 UTCApr 14, 09:05 UTC10m
2026-04-14 WP2 - Apr 14, 07:10 UTCApr 14, 07:20 UTC10m
2026-04-13 WP2 - Apr 13, 16:15 UTCApr 13, 16:40 UTC25m
2026-04-13 WP2 - Apr 13, 15:50 UTCApr 13, 16:40 UTC50m
2026-04-13 WP2 - Apr 13, 15:40 UTCApr 13, 16:15 UTC35m
2026-04-13 WP2 - Apr 13, 15:15 UTCApr 13, 15:20 UTC5m
2026-04-13 WP2 TMW → TMW Apr 13, 14:25 UTCApr 13, 14:30 UTC5m
2026-04-13 WP2 - Apr 13, 13:10 UTCApr 13, 14:10 UTC1h 0m
2026-04-13 WP2 - Apr 13, 11:25 UTCApr 13, 12:15 UTC50m
2026-04-13 WP2 - Apr 13, 10:20 UTCApr 13, 10:30 UTC10m
2026-04-13 WP2 - Apr 13, 09:30 UTCApr 13, 09:40 UTC10m
2026-04-13 WP2 - Apr 13, 05:10 UTCApr 13, 05:20 UTC10m
2026-04-13 WP2 - Apr 13, 04:25 UTCApr 13, 04:40 UTC15m

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

Mode-S 7C81CD frequently asked

What is Mode-S code 7C81CD?
7C81CD is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZXB.
Where is Mode-S 7C81CD registered?
Mode-S code 7C81CD is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C81CD broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C81CD, octal 37100715, decimal 8,159,693.
What flights does 7C81CD operate?
Mode-S 7C81CD has broadcast 1 distinct callsign, including WP2.