Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4AC9A1

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RMA · BOMBARDIER BD-100 Challenger 300

Hex
4AC9A1
Octal
22544641
Decimal
4,901,281
Country
SE
Tail
SE-RMA
Type
CL30
No current signal · last broadcast Jul 26, 16:35 UTC
Flights observed
88
Distinct callsigns
2
Country
SE
Last broadcast
Jul 26, 16:35 UTC

Last known position

Most recent position reported by Mode-S 4AC9A1.

Country allocation

The ICAO 24-bit address 4AC9A1 falls within the block assigned to Sweden (SE) by ICAO Annex 10, Volume III. Every aircraft registered in Sweden 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 2 distinct

Callsign Airline Flights Last seen
HCR10 - 73 2026-07-26
HCR010 - 15 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HCR10 NCE → OXF Jul 26, 14:50 UTCJul 26, 16:35 UTC1h 45m
2026-07-26 HCR10 - Jul 26, 11:40 UTCJul 26, 12:15 UTC35m
2026-07-26 HCR10 - Jul 26, 09:55 UTCJul 26, 10:40 UTC45m
2026-07-25 HCR10 DBV → GVA Jul 25, 14:25 UTCJul 25, 16:00 UTC1h 35m
2026-07-25 HCR10 ZRH → DBV Jul 25, 12:15 UTCJul 25, 13:35 UTC1h 20m
2026-07-25 HCR10 BER → ZRH Jul 25, 06:50 UTCJul 25, 07:50 UTC1h 0m
2026-07-23 HCR10 ZRH → BER Jul 23, 09:50 UTCJul 23, 11:00 UTC1h 10m
2026-07-23 HCR10 - Jul 23, 07:35 UTCJul 23, 08:30 UTC55m
2026-07-23 HCR10 CEQ → NCE Jul 23, 06:40 UTCJul 23, 06:55 UTC15m
2026-07-21 HCR10 - Jul 21, 14:15 UTCJul 21, 14:30 UTC15m
2026-07-20 HCR10 STR → NCE Jul 20, 16:50 UTCJul 20, 17:50 UTC1h 0m
2026-07-20 HCR10 - Jul 20, 15:10 UTCJul 20, 15:25 UTC15m
2026-07-20 HCR10 - Jul 20, 13:05 UTCJul 20, 14:20 UTC1h 15m
2026-07-20 HCR10 - Jul 20, 11:20 UTCJul 20, 12:30 UTC1h 10m
2026-07-20 HCR010 - Jul 20, 06:55 UTCJul 20, 07:40 UTC45m
2026-07-18 HCR010 - Jul 18, 14:25 UTCJul 18, 16:35 UTC2h 10m
2026-07-18 HCR010 - Jul 18, 10:15 UTCJul 18, 12:35 UTC2h 20m
2026-07-17 HCR10 - Jul 17, 13:55 UTCJul 17, 15:15 UTC1h 20m
2026-07-15 HCR10 - Jul 15, 10:40 UTCJul 15, 12:30 UTC1h 50m
2026-07-15 HCR10 - Jul 15, 07:10 UTCJul 15, 08:05 UTC55m
2026-07-13 HCR10 - Jul 13, 15:20 UTCJul 13, 17:30 UTC2h 10m
2026-07-13 HCR10 - Jul 13, 11:15 UTCJul 13, 13:45 UTC2h 30m
2026-07-13 HCR010 - Jul 13, 07:40 UTCJul 13, 09:00 UTC1h 20m
2026-07-12 HCR010 - Jul 12, 09:50 UTCJul 12, 11:55 UTC2h 5m
2026-07-11 HCR10 - Jul 11, 17:35 UTCJul 11, 18:25 UTC50m
2026-07-11 HCR10 - Jul 11, 13:30 UTCJul 11, 15:35 UTC2h 5m
2026-07-09 HCR10 - Jul 9, 07:10 UTCJul 9, 09:10 UTC2h 0m
2026-07-09 HCR010 - Jul 9, 04:35 UTCJul 9, 06:00 UTC1h 25m
2026-07-08 HCR010 - Jul 8, 15:20 UTCJul 8, 16:00 UTC40m
2026-07-07 HCR010 - Jul 7, 13:10 UTCJul 7, 13:55 UTC45m
2026-07-07 HCR010 - Jul 7, 10:15 UTCJul 7, 11:15 UTC1h 0m
2026-07-06 HCR010 - Jul 6, 10:05 UTCJul 6, 11:45 UTC1h 40m
2026-07-04 HCR010 - Jul 4, 11:15 UTCJul 4, 13:00 UTC1h 45m
2026-07-04 HCR10 ATH → NCE Jul 4, 07:10 UTCJul 4, 09:20 UTC2h 10m
2026-07-03 HCR10 - Jul 3, 12:15 UTCJul 3, 15:55 UTC3h 40m
2026-07-02 HCR10 - Jul 2, 11:20 UTCJul 2, 13:50 UTC2h 30m
2026-07-01 HCR10 - Jul 1, 11:10 UTCJul 1, 13:15 UTC2h 5m
2026-07-01 HCR10 - Jul 1, 09:30 UTCJul 1, 09:40 UTC10m
2026-06-29 HCR10 - Jun 29, 09:14 UTCJun 29, 09:54 UTC40m
2026-06-28 HCR10 TLN → PGF Jun 28, 15:34 UTCJun 28, 16:05 UTC30m
2026-06-28 HCR10 - Jun 28, 13:19 UTCJun 28, 14:45 UTC1h 25m
2026-06-28 HCR10 - Jun 28, 12:35 UTCJun 28, 13:14 UTC40m
2026-06-28 HCR10 MAD → MME Jun 28, 08:50 UTCJun 28, 10:44 UTC1h 55m
2026-06-27 HCR010 - Jun 27, 12:50 UTCJun 27, 14:45 UTC1h 55m
2026-06-27 HCR10 - Jun 27, 11:30 UTCJun 27, 12:09 UTC40m
2026-06-27 HCR10 - Jun 27, 08:39 UTCJun 27, 09:50 UTC1h 10m
2026-06-27 HCR10 - Jun 27, 06:30 UTCJun 27, 07:24 UTC55m
2026-06-26 HCR10 BMA → CEQ Jun 26, 10:30 UTCJun 26, 13:15 UTC2h 45m
2026-06-26 HCR10 - Jun 26, 07:00 UTCJun 26, 09:00 UTC2h 0m
2026-06-23 HCR010 - Jun 23, 09:54 UTCJun 23, 12:09 UTC2h 15m

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 SE-RMA page for operator, model, and routing details .

Mode-S 4AC9A1 frequently asked

What is Mode-S code 4AC9A1?
4AC9A1 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RMA.
Where is Mode-S 4AC9A1 registered?
Mode-S code 4AC9A1 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AC9A1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AC9A1, octal 22544641, decimal 4,901,281.
What flights does 4AC9A1 operate?
Mode-S 4AC9A1 has broadcast 2 distinct callsigns, including HCR10, HCR010.