Apparatus

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sensors Mode-S transponder

4AC9B4

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RMT · BOMBARDIER BD-700 Global 6000/6500

Hex
4AC9B4
Octal
22544664
Decimal
4,901,300
Country
SE
Tail
SE-RMT
Type
GLEX
No current signal · last broadcast 3d ago
Flights observed
97
Distinct callsigns
1
Country
SE
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 4AC9B4.

Country allocation

The ICAO 24-bit address 4AC9B4 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 1 distinct

Callsign Airline Flights Last seen
SERMT - 97 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 SERMT BMA → LPI Jul 10, 13:25 UTCJul 10, 13:45 UTC20m
2026-07-10 SERMT BER → BMA Jul 10, 11:00 UTCJul 10, 12:20 UTC1h 20m
2026-07-09 SERMT - Jul 9, 15:15 UTCJul 9, 16:10 UTC55m
2026-07-09 SERMT - Jul 9, 11:05 UTCJul 9, 12:45 UTC1h 40m
2026-07-08 SERMT - Jul 8, 04:45 UTCJul 8, 05:10 UTC25m
2026-07-08 SERMT - Jul 8, 03:25 UTCJul 8, 03:55 UTC30m
2026-07-07 SERMT - Jul 7, 18:05 UTCJul 8, 02:15 UTC8h 10m
2026-07-06 SERMT - Jul 6, 10:25 UTCJul 6, 12:15 UTC1h 50m
2026-07-06 SERMT - Jul 6, 00:30 UTCJul 6, 01:05 UTC35m
2026-07-04 SERMT - Jul 4, 18:50 UTCJul 5, 01:50 UTC7h 0m
2026-07-04 SERMT - Jul 4, 16:45 UTCJul 4, 17:10 UTC25m
2026-07-02 SERMT - Jul 2, 16:15 UTCJul 2, 16:40 UTC25m
2026-07-02 SERMT - Jul 2, 14:35 UTCJul 2, 15:40 UTC1h 5m
2026-07-01 SERMT - Jul 1, 15:25 UTCJul 1, 16:15 UTC50m
2026-07-01 SERMT - Jul 1, 13:45 UTCJul 1, 14:15 UTC30m
2026-06-27 SERMT BMA → LPI Jun 27, 11:09 UTCJun 27, 11:35 UTC25m
2026-06-27 SERMT HEL → BMA Jun 27, 09:55 UTCJun 27, 10:34 UTC40m
2026-06-25 SERMT BMA → HEL Jun 25, 12:15 UTCJun 25, 13:00 UTC45m
2026-06-25 SERMT ARN → BMA Jun 25, 10:20 UTCJun 25, 10:30 UTC10m
2026-06-24 SERMT - Jun 24, 20:40 UTCJun 24, 21:09 UTC30m
2026-06-24 SERMT - Jun 24, 19:00 UTCJun 24, 19:15 UTC15m
2026-06-24 SERMT - Jun 24, 07:59 UTCJun 24, 08:45 UTC45m
2026-06-24 SERMT - Jun 24, 07:15 UTCJun 24, 07:54 UTC40m
2026-06-23 SERMT - Jun 23, 08:30 UTCJun 23, 08:50 UTC20m
2026-06-23 SERMT - Jun 23, 06:59 UTCJun 23, 07:19 UTC20m
2026-06-23 SERMT - Jun 23, 05:29 UTCJun 23, 05:54 UTC25m
2026-06-17 SERMT ARN → LPI Jun 17, 20:40 UTCJun 17, 21:05 UTC25m
2026-06-17 SERMT - Jun 17, 17:55 UTCJun 17, 19:55 UTC2h 0m
2026-06-17 SERMT BMA → LBG Jun 17, 05:05 UTCJun 17, 07:10 UTC2h 5m
2026-06-16 SERMT - Jun 16, 16:45 UTCJun 16, 17:10 UTC25m
2026-06-16 SERMT - Jun 16, 11:00 UTCJun 16, 11:20 UTC20m
2026-06-16 SERMT - Jun 16, 09:40 UTCJun 16, 10:45 UTC1h 5m
2026-06-16 SERMT - Jun 16, 09:00 UTCJun 16, 09:10 UTC10m
2026-06-13 SERMT ARN → LPI Jun 13, 06:55 UTCJun 13, 07:20 UTC25m
2026-06-12 SERMT IAD → ARN Jun 12, 22:20 UTCJun 13, 05:45 UTC7h 24m
2026-06-11 SERMT ARN → IAD Jun 11, 14:05 UTCJun 11, 21:40 UTC7h 35m
2026-06-11 SERMT - Jun 11, 11:15 UTCJun 11, 11:45 UTC30m
2026-06-10 SERMT - Jun 10, 09:40 UTCJun 10, 11:40 UTC2h 0m
2026-06-10 SERMT - Jun 10, 08:45 UTCJun 10, 09:30 UTC45m
2026-06-08 SERMT - Jun 8, 13:55 UTCJun 8, 14:20 UTC25m
2026-06-08 SERMT WAW → BMA Jun 8, 11:50 UTCJun 8, 13:10 UTC1h 20m
2026-06-08 SERMT BMA → WAW Jun 8, 06:45 UTCJun 8, 07:55 UTC1h 10m
2026-06-08 SERMT - Jun 8, 05:25 UTCJun 8, 05:45 UTC20m
2026-06-03 SERMT BMA → LPI Jun 3, 07:35 UTCJun 3, 08:00 UTC25m
2026-06-02 SERMT - Jun 2, 19:30 UTCJun 2, 19:55 UTC25m
2026-06-02 SERMT BMA → LPI Jun 2, 11:00 UTCJun 2, 11:20 UTC20m
2026-06-02 SERMT - Jun 2, 09:05 UTCJun 2, 09:25 UTC20m
2026-05-30 SERMT - May 30, 11:10 UTCMay 30, 13:50 UTC2h 40m
2026-05-29 SERMT LPI → LPI May 29, 09:55 UTCMay 29, 10:20 UTC25m
2026-05-29 SERMT - May 29, 09:35 UTCMay 29, 09:50 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 SE-RMT page for operator, model, and routing details .

Mode-S 4AC9B4 frequently asked

What is Mode-S code 4AC9B4?
4AC9B4 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RMT.
Where is Mode-S 4AC9B4 registered?
Mode-S code 4AC9B4 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AC9B4 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 4AC9B4, octal 22544664, decimal 4,901,300.
What flights does 4AC9B4 operate?
Mode-S 4AC9B4 has broadcast 1 distinct callsign, including SERMT.