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sensors Mode-S transponder

4B28AA

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-PKK · PIPER PA-28-140/150/160/180

Hex
4B28AA
Octal
22624252
Decimal
4,925,610
Country
CH
Tail
HB-PKK
Type
P28A
No current signal · last broadcast 1d ago
Flights observed
123
Distinct callsigns
1
Country
CH
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4B28AA.

Country allocation

The ICAO 24-bit address 4B28AA falls within the block assigned to Switzerland (CH) by ICAO Annex 10, Volume III. Every aircraft registered in Switzerland 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
HBPKK - 123 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 HBPKK - Jul 16, 12:20 UTCJul 16, 13:20 UTC1h 0m
2026-07-16 HBPKK - Jul 16, 07:55 UTCJul 16, 08:55 UTC1h 0m
2026-07-15 HBPKK BRN → BRN Jul 15, 15:10 UTCJul 15, 16:00 UTC50m
2026-07-14 HBPKK - Jul 14, 08:25 UTCJul 14, 09:25 UTC1h 0m
2026-07-11 HBPKK BRN → BRN Jul 11, 08:55 UTCJul 11, 09:50 UTC55m
2026-07-10 HBPKK BRN → BRN Jul 10, 15:15 UTCJul 10, 15:45 UTC30m
2026-07-09 HBPKK BRN → BRN Jul 9, 08:10 UTCJul 9, 08:55 UTC45m
2026-07-08 HBPKK BRN → BRN Jul 8, 07:10 UTCJul 8, 08:10 UTC1h 0m
2026-07-07 HBPKK BSL → BRN Jul 7, 15:10 UTCJul 7, 15:55 UTC45m
2026-07-07 HBPKK BRN → BSL Jul 7, 14:00 UTCJul 7, 14:30 UTC30m
2026-07-06 HBPKK - Jul 6, 08:05 UTCJul 6, 09:15 UTC1h 10m
2026-07-05 HBPKK BRN → BRN Jul 5, 10:00 UTCJul 5, 11:00 UTC1h 0m
2026-07-04 HBPKK BRN → BRN Jul 4, 12:00 UTCJul 4, 13:25 UTC1h 25m
2026-07-04 HBPKK BRN → BRN Jul 4, 08:25 UTCJul 4, 09:00 UTC35m
2026-07-03 HBPKK - Jul 3, 14:40 UTCJul 3, 17:05 UTC2h 25m
2026-07-03 HBPKK - Jul 3, 11:05 UTCJul 3, 13:00 UTC1h 55m
2026-07-02 HBPKK - Jul 2, 14:50 UTCJul 2, 15:25 UTC35m
2026-07-02 HBPKK - Jul 2, 12:50 UTCJul 2, 13:25 UTC35m
2026-07-02 HBPKK - Jul 2, 10:10 UTCJul 2, 10:25 UTC15m
2026-07-02 HBPKK - Jul 2, 06:15 UTCJul 2, 07:20 UTC1h 5m
2026-06-29 HBPKK BRN → BRN Jun 29, 09:25 UTCJun 29, 10:04 UTC40m
2026-06-26 HBPKK BRN → BRN Jun 26, 13:04 UTCJun 26, 13:59 UTC55m
2026-06-23 HBPKK BRN → BRN Jun 23, 15:59 UTCJun 23, 16:39 UTC40m
2026-06-22 HBPKK BRN → BRN Jun 22, 11:44 UTCJun 22, 13:44 UTC2h 0m
2026-06-21 HBPKK - Jun 21, 13:24 UTCJun 21, 15:09 UTC1h 45m
2026-06-21 HBPKK - Jun 21, 11:20 UTCJun 21, 11:55 UTC35m
2026-06-21 HBPKK - Jun 21, 09:40 UTCJun 21, 10:49 UTC1h 10m
2026-06-20 HBPKK - Jun 20, 14:54 UTCJun 20, 16:05 UTC1h 10m
2026-06-19 HBPKK - Jun 19, 15:09 UTCJun 19, 16:25 UTC1h 15m
2026-06-19 HBPKK - Jun 19, 12:14 UTCJun 19, 13:20 UTC1h 5m
2026-06-19 HBPKK - Jun 19, 11:14 UTCJun 19, 11:30 UTC15m
2026-06-19 HBPKK - Jun 19, 08:09 UTCJun 19, 09:19 UTC1h 10m
2026-06-18 HBPKK BRN → BRN Jun 18, 12:10 UTCJun 18, 13:10 UTC1h 0m
2026-06-18 HBPKK BRN → BRN Jun 18, 08:15 UTCJun 18, 09:20 UTC1h 5m
2026-06-18 HBPKK BRN → BRN Jun 18, 06:40 UTCJun 18, 07:05 UTC25m
2026-06-17 HBPKK - Jun 17, 11:50 UTCJun 17, 12:25 UTC35m
2026-06-17 HBPKK - Jun 17, 09:20 UTCJun 17, 10:05 UTC45m
2026-06-17 HBPKK - Jun 17, 08:00 UTCJun 17, 08:45 UTC45m
2026-06-16 HBPKK BRN → BRN Jun 16, 16:10 UTCJun 16, 17:05 UTC55m
2026-06-14 HBPKK BRN → BRN Jun 14, 07:10 UTCJun 14, 08:10 UTC1h 0m
2026-06-13 HBPKK BRN → BRN Jun 13, 11:10 UTCJun 13, 12:00 UTC50m
2026-06-12 HBPKK - Jun 12, 16:20 UTCJun 12, 16:45 UTC25m
2026-06-12 HBPKK - Jun 12, 15:20 UTCJun 12, 15:45 UTC25m
2026-06-12 HBPKK - Jun 12, 12:30 UTCJun 12, 13:20 UTC50m
2026-06-12 HBPKK - Jun 12, 10:20 UTCJun 12, 11:35 UTC1h 15m
2026-06-12 HBPKK BRN → BRN Jun 12, 07:50 UTCJun 12, 09:30 UTC1h 40m
2026-06-08 HBPKK - Jun 8, 13:35 UTCJun 8, 14:30 UTC55m
2026-06-08 HBPKK - Jun 8, 12:50 UTCJun 8, 13:00 UTC10m
2026-06-08 HBPKK - Jun 8, 12:10 UTCJun 8, 12:25 UTC15m
2026-06-08 HBPKK BRN → BRN Jun 8, 09:20 UTCJun 8, 10:20 UTC1h 0m

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 HB-PKK page for operator, model, and routing details .

Mode-S 4B28AA frequently asked

What is Mode-S code 4B28AA?
4B28AA is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-PKK.
Where is Mode-S 4B28AA registered?
Mode-S code 4B28AA is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B28AA broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B28AA, octal 22624252, decimal 4,925,610.
What flights does 4B28AA operate?
Mode-S 4B28AA has broadcast 1 distinct callsign, including HBPKK.