Apparatus

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sensors Mode-S transponder

4A9CEF

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-GGO · CESSNA 172 Skyhawk

Hex
4A9CEF
Octal
22516357
Decimal
4,889,839
Country
SE
Tail
SE-GGO
Type
C172
No current signal · last broadcast 11d ago
Flights observed
107
Distinct callsigns
1
Country
SE
Last broadcast
11d ago

Last known position

Most recent position reported by Mode-S 4A9CEF.

Country allocation

The ICAO 24-bit address 4A9CEF 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
SEGGO - 107 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 SEGGO - Jul 24, 13:50 UTCJul 24, 15:10 UTC1h 20m
2026-07-24 SEGGO - Jul 24, 13:00 UTCJul 24, 13:20 UTC20m
2026-07-23 SEGGO - Jul 23, 18:10 UTCJul 23, 18:40 UTC30m
2026-07-23 SEGGO - Jul 23, 15:55 UTCJul 23, 17:00 UTC1h 5m
2026-07-21 SEGGO - Jul 21, 09:40 UTCJul 21, 10:05 UTC25m
2026-07-21 SEGGO - Jul 21, 08:05 UTCJul 21, 08:30 UTC25m
2026-07-20 SEGGO - Jul 20, 16:20 UTCJul 20, 17:00 UTC40m
2026-07-19 SEGGO - Jul 19, 14:55 UTCJul 19, 15:10 UTC15m
2026-07-19 SEGGO - Jul 19, 13:00 UTCJul 19, 14:05 UTC1h 5m
2026-07-19 SEGGO - Jul 19, 11:30 UTCJul 19, 12:20 UTC50m
2026-07-17 SEGGO BLE → BLE Jul 17, 15:10 UTCJul 17, 15:40 UTC30m
2026-07-17 SEGGO - Jul 17, 10:30 UTCJul 17, 11:00 UTC30m
2026-07-17 SEGGO - Jul 17, 08:59 UTCJul 17, 09:40 UTC40m
2026-07-16 SEGGO - Jul 16, 20:05 UTCJul 16, 20:15 UTC10m
2026-07-16 SEGGO - Jul 16, 18:40 UTCJul 16, 18:55 UTC15m
2026-07-15 SEGGO - Jul 15, 15:55 UTCJul 15, 16:15 UTC20m
2026-07-15 SEGGO - Jul 15, 14:15 UTCJul 15, 14:30 UTC15m
2026-07-15 SEGGO - Jul 15, 12:40 UTCJul 15, 12:55 UTC15m
2026-07-15 SEGGO - Jul 15, 10:55 UTCJul 15, 11:15 UTC20m
2026-07-15 SEGGO - Jul 15, 08:10 UTCJul 15, 09:30 UTC1h 20m
2026-07-14 SEGGO - Jul 14, 14:55 UTCJul 14, 15:30 UTC35m
2026-07-14 SEGGO BLE → BLE Jul 14, 08:50 UTCJul 14, 09:55 UTC1h 5m
2026-07-13 SEGGO - Jul 13, 15:00 UTCJul 13, 15:20 UTC20m
2026-07-13 SEGGO - Jul 13, 13:20 UTCJul 13, 13:40 UTC20m
2026-07-13 SEGGO - Jul 13, 07:40 UTCJul 13, 08:25 UTC45m
2026-07-11 SEGGO - Jul 11, 15:45 UTCJul 11, 16:10 UTC25m
2026-07-11 SEGGO - Jul 11, 05:31 UTCJul 11, 06:10 UTC40m
2026-07-10 SEGGO - Jul 10, 15:50 UTCJul 10, 16:15 UTC25m
2026-07-10 SEGGO - Jul 10, 12:40 UTCJul 10, 13:25 UTC45m
2026-07-10 SEGGO - Jul 10, 11:45 UTCJul 10, 11:55 UTC10m
2026-07-10 SEGGO - Jul 10, 07:55 UTCJul 10, 08:25 UTC30m
2026-07-09 SEGGO - Jul 9, 14:35 UTCJul 9, 15:10 UTC35m
2026-07-08 SEGGO - Jul 8, 15:35 UTCJul 8, 16:15 UTC40m
2026-07-08 SEGGO - Jul 8, 11:45 UTCJul 8, 12:10 UTC25m
2026-07-07 SEGGO - Jul 7, 07:45 UTCJul 7, 09:15 UTC1h 30m
2026-07-04 SEGGO - Jul 4, 15:00 UTCJul 4, 15:40 UTC40m
2026-07-04 SEGGO - Jul 4, 13:35 UTCJul 4, 14:10 UTC35m
2026-07-01 SEGGO - Jul 1, 15:05 UTCJul 1, 16:45 UTC1h 40m
2026-07-01 SEGGO - Jul 1, 13:10 UTCJul 1, 14:25 UTC1h 15m
2026-07-01 SEGGO - Jul 1, 07:50 UTCJul 1, 08:25 UTC35m
2026-06-30 SEGGO - Jun 30, 14:55 UTCJun 30, 15:25 UTC30m
2026-06-30 SEGGO - Jun 30, 13:10 UTCJun 30, 14:25 UTC1h 15m
2026-06-29 SEGGO - Jun 29, 17:14 UTCJun 29, 17:45 UTC30m
2026-06-29 SEGGO - Jun 29, 15:09 UTCJun 29, 16:44 UTC1h 35m
2026-06-29 SEGGO - Jun 29, 13:34 UTCJun 29, 14:04 UTC30m
2026-06-29 SEGGO - Jun 29, 11:10 UTCJun 29, 13:00 UTC1h 50m
2026-06-28 SEGGO BLE → BLE Jun 28, 15:34 UTCJun 28, 16:39 UTC1h 5m
2026-06-25 SEGGO - Jun 25, 18:00 UTCJun 25, 18:15 UTC15m
2026-06-25 SEGGO - Jun 25, 15:20 UTCJun 25, 16:35 UTC1h 15m
2026-06-25 SEGGO - Jun 25, 13:24 UTCJun 25, 14:14 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 SE-GGO page for operator, model, and routing details .

Mode-S 4A9CEF frequently asked

What is Mode-S code 4A9CEF?
4A9CEF is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-GGO.
Where is Mode-S 4A9CEF registered?
Mode-S code 4A9CEF is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A9CEF broadcasting right now?
No active broadcast right now. Last signal was 11d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A9CEF, octal 22516357, decimal 4,889,839.
What flights does 4A9CEF operate?
Mode-S 4A9CEF has broadcast 1 distinct callsign, including SEGGO.