Apparatus

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sensors Mode-S transponder

320021

ICAO 24-bit transponder address · allocated to Italy

Currently assigned to MM81926 · AGUSTA AW-139

Hex
320021
Octal
14400041
Decimal
3,276,833
Country
IT
Tail
MM81926
Type
A139
No current signal · last broadcast 3d ago
Flights observed
111
Distinct callsigns
20
Country
IT
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 320021.

Country allocation

The ICAO 24-bit address 320021 falls within the block assigned to Italy (IT) by ICAO Annex 10, Volume III. Every aircraft registered in Italy 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
VOLPE403 - 23 2026-06-29
VOLPE30 - 9 2026-07-24
VOLPE22 - 9 2026-07-02
VOLPE43 - 8 2026-07-23
VOLPE40 - 7 2026-07-15
VOLPE20 - 6 2026-06-24
VOLPE13 - 6 2026-07-21
VOLPE33 - 5 2026-07-21
VOLPE23 - 5 2026-07-06
VOLP43 - 5 2026-05-29
VOLP403 - 5 2026-07-17
VOLPE24 - 4 2026-07-16
VOLPE31 - 3 2026-07-16
VOLPE08 - 3 2026-07-14
VOLPE09 - 2 2026-07-15
VOLPE03 - 2 2026-07-15
VOLPE02 - 2 2026-07-14
VOLPE00 - 2 2026-05-22
VOPE20 - 1 2026-07-06
VOLPE11 - 1 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 VOLPE30 - Jul 24, 08:25 UTCJul 24, 09:25 UTC1h 0m
2026-07-23 VOLPE43 - Jul 23, 16:20 UTCJul 23, 16:50 UTC30m
2026-07-23 VOLPE43 - Jul 23, 14:30 UTCJul 23, 14:50 UTC20m
2026-07-22 VOLPE43 - Jul 22, 15:45 UTCJul 22, 16:00 UTC15m
2026-07-21 VOLPE33 - Jul 21, 12:55 UTCJul 21, 13:40 UTC45m
2026-07-21 VOLPE13 - Jul 21, 09:30 UTCJul 21, 10:20 UTC50m
2026-07-17 VOLP403 - Jul 17, 13:35 UTCJul 17, 14:10 UTC35m
2026-07-17 VOLPE33 - Jul 17, 08:49 UTCJul 17, 10:00 UTC1h 10m
2026-07-17 VOLPE30 - Jul 17, 07:14 UTCJul 17, 08:00 UTC45m
2026-07-16 VOLPE24 - Jul 16, 19:40 UTCJul 16, 20:35 UTC55m
2026-07-16 VOLPE33 - Jul 16, 11:15 UTCJul 16, 12:05 UTC50m
2026-07-16 VOLPE13 - Jul 16, 09:25 UTCJul 16, 10:20 UTC55m
2026-07-16 VOLPE31 - Jul 16, 06:25 UTCJul 16, 07:05 UTC40m
2026-07-15 VOLPE03 - Jul 15, 15:30 UTCJul 15, 16:25 UTC55m
2026-07-15 VOLPE11 - Jul 15, 14:00 UTCJul 15, 14:55 UTC55m
2026-07-15 VOLPE40 - Jul 15, 12:45 UTCJul 15, 13:05 UTC20m
2026-07-15 VOLPE09 - Jul 15, 11:15 UTCJul 15, 12:10 UTC55m
2026-07-15 VOLPE13 - Jul 15, 09:15 UTCJul 15, 10:10 UTC55m
2026-07-15 VOLPE31 - Jul 15, 07:40 UTCJul 15, 08:30 UTC50m
2026-07-14 VOLPE02 - Jul 14, 14:35 UTCJul 14, 14:55 UTC20m
2026-07-14 VOLPE31 - Jul 14, 12:35 UTCJul 14, 13:10 UTC35m
2026-07-14 VOLPE08 - Jul 14, 10:35 UTCJul 14, 11:25 UTC50m
2026-07-13 VOLPE30 - Jul 13, 19:45 UTCJul 13, 20:50 UTC1h 5m
2026-07-13 VOLPE13 - Jul 13, 14:45 UTCJul 13, 15:20 UTC35m
2026-07-13 VOLPE09 - Jul 13, 10:35 UTCJul 13, 12:45 UTC2h 10m
2026-07-06 VOLPE23 - Jul 6, 11:20 UTCJul 6, 12:50 UTC1h 30m
2026-07-06 VOLPE30 - Jul 6, 09:15 UTCJul 6, 10:10 UTC55m
2026-07-06 VOPE20 - Jul 6, 07:25 UTCJul 6, 08:20 UTC55m
2026-07-03 VOLPE24 - Jul 3, 11:30 UTCJul 3, 11:55 UTC25m
2026-07-03 VOLPE24 - Jul 3, 10:25 UTCJul 3, 11:25 UTC1h 0m
2026-07-03 VOLPE30 - Jul 3, 08:30 UTCJul 3, 09:35 UTC1h 5m
2026-07-02 VOLPE22 - Jul 2, 15:25 UTCJul 2, 16:20 UTC55m
2026-07-02 VOLP403 - Jul 2, 09:45 UTCJul 2, 10:20 UTC35m
2026-07-01 VOLP403 - Jul 1, 16:40 UTCJul 1, 17:05 UTC25m
2026-07-01 VOLP403 - Jul 1, 15:35 UTCJul 1, 16:00 UTC25m
2026-07-01 VOLPE24 - Jul 1, 09:55 UTCJul 1, 11:10 UTC1h 15m
2026-06-29 VOLPE403 - Jun 29, 11:35 UTCJun 29, 13:19 UTC1h 45m
2026-06-26 VOLPE403 - Jun 26, 16:49 UTCJun 26, 17:19 UTC30m
2026-06-26 VOLPE403 - Jun 26, 14:29 UTCJun 26, 14:50 UTC20m
2026-06-26 VOLPE403 - Jun 26, 09:45 UTCJun 26, 10:50 UTC1h 5m
2026-06-26 VOLPE403 - Jun 26, 07:35 UTCJun 26, 08:15 UTC40m
2026-06-25 VOLPE403 - Jun 25, 17:39 UTCJun 25, 18:34 UTC55m
2026-06-25 VOLPE403 - Jun 25, 14:14 UTCJun 25, 15:44 UTC1h 30m
2026-06-24 VOLPE20 - Jun 24, 10:14 UTCJun 24, 11:50 UTC1h 35m
2026-06-24 VOLPE01 - Jun 24, 07:50 UTCJun 24, 08:45 UTC55m
2026-06-23 VOLPE22 - Jun 23, 10:29 UTCJun 23, 11:19 UTC50m
2026-06-23 VOLPE22 - Jun 23, 07:40 UTCJun 23, 08:59 UTC1h 20m
2026-06-22 VOLPE20 - Jun 22, 12:59 UTCJun 22, 13:39 UTC40m
2026-06-22 VOLP03 - Jun 22, 10:55 UTCJun 22, 11:30 UTC35m
2026-06-19 VOLP403 - Jun 19, 14:19 UTCJun 19, 15:09 UTC50m

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 MM81926 page for operator, model, and routing details .

Mode-S 320021 frequently asked

What is Mode-S code 320021?
320021 is an ICAO 24-bit transponder address. Allocated to Italy. Assigned to MM81926.
Where is Mode-S 320021 registered?
Mode-S code 320021 is allocated to Italy (IT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 320021 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 320021, octal 14400041, decimal 3,276,833.
What flights does 320021 operate?
Mode-S 320021 has broadcast 20 distinct callsigns, including VOLPE403, VOLPE30, VOLPE22, VOLPE43, VOLPE40.