Apparatus

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sensors Mode-S transponder

00901B

ICAO 24-bit transponder address · allocated to South Africa

Currently assigned to ZS-GBY · SCHEIBE SF-25 Falke

Hex
00901B
Octal
00110033
Decimal
36,891
Country
ZA
Tail
ZS-GBY
Type
SF25
No current signal · last broadcast Jul 26, 14:25 UTC
Flights observed
219
Distinct callsigns
1
Country
ZA
Last broadcast
Jul 26, 14:25 UTC

Last known position

Most recent position reported by Mode-S 00901B.

Country allocation

The ICAO 24-bit address 00901B falls within the block assigned to South Africa (ZA) by ICAO Annex 10, Volume III. Every aircraft registered in South Africa 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
ZSESW - 219 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZSESW - Jul 26, 13:40 UTCJul 26, 14:25 UTC45m
2026-07-24 ZSESW - Jul 24, 13:40 UTCJul 24, 14:25 UTC45m
2026-07-24 ZSESW - Jul 24, 12:00 UTCJul 24, 12:20 UTC20m
2026-07-24 ZSESW - Jul 24, 10:15 UTCJul 24, 10:30 UTC15m
2026-07-24 ZSESW - Jul 24, 07:30 UTCJul 24, 08:00 UTC30m
2026-07-24 ZSESW HLA → HLA Jul 24, 05:45 UTCJul 24, 06:25 UTC40m
2026-07-23 ZSESW - Jul 23, 14:05 UTCJul 23, 14:35 UTC30m
2026-07-23 ZSESW - Jul 23, 09:30 UTCJul 23, 10:40 UTC1h 10m
2026-07-23 ZSESW HLA → HLA Jul 23, 05:55 UTCJul 23, 06:40 UTC45m
2026-07-22 ZSESW HLA → HLA Jul 22, 14:15 UTCJul 22, 15:30 UTC1h 15m
2026-07-22 ZSESW - Jul 22, 11:55 UTCJul 22, 12:50 UTC55m
2026-07-21 ZSESW - Jul 21, 13:30 UTCJul 21, 14:25 UTC55m
2026-07-21 ZSESW - Jul 21, 11:40 UTCJul 21, 12:15 UTC35m
2026-07-21 ZSESW - Jul 21, 07:40 UTCJul 21, 08:45 UTC1h 5m
2026-07-21 ZSESW - Jul 21, 06:20 UTCJul 21, 07:00 UTC40m
2026-07-20 ZSESW - Jul 20, 15:00 UTCJul 20, 15:10 UTC10m
2026-07-20 ZSESW HLA → HLA Jul 20, 12:00 UTCJul 20, 12:55 UTC55m
2026-07-20 ZSESW - Jul 20, 10:00 UTCJul 20, 10:50 UTC50m
2026-07-20 ZSESW - Jul 20, 07:55 UTCJul 20, 09:05 UTC1h 10m
2026-07-20 ZSESW - Jul 20, 06:15 UTCJul 20, 07:10 UTC55m
2026-07-19 ZSESW - Jul 19, 07:45 UTCJul 19, 09:00 UTC1h 15m
2026-07-19 ZSESW - Jul 19, 06:40 UTCJul 19, 07:15 UTC35m
2026-07-18 ZSESW - Jul 18, 16:15 UTCJul 18, 18:00 UTC1h 45m
2026-07-18 ZSESW HLA → HLA Jul 18, 13:40 UTCJul 18, 14:45 UTC1h 5m
2026-07-18 ZSESW - Jul 18, 10:55 UTCJul 18, 11:45 UTC50m
2026-07-18 ZSESW - Jul 18, 09:50 UTCJul 18, 10:20 UTC30m
2026-07-18 ZSESW - Jul 18, 05:40 UTCJul 18, 06:30 UTC50m
2026-07-17 ZSESW - Jul 17, 16:15 UTCJul 17, 17:15 UTC1h 0m
2026-07-17 ZSESW - Jul 17, 13:29 UTCJul 17, 14:24 UTC55m
2026-07-17 ZSESW HLA → HLA Jul 17, 10:25 UTCJul 17, 11:30 UTC1h 5m
2026-07-17 ZSESW - Jul 17, 08:20 UTCJul 17, 08:54 UTC35m
2026-07-16 ZSESW - Jul 16, 17:00 UTCJul 16, 18:05 UTC1h 5m
2026-07-16 ZSESW - Jul 16, 14:29 UTCJul 16, 15:30 UTC1h 0m
2026-07-16 ZSESW - Jul 16, 11:34 UTCJul 16, 12:49 UTC1h 15m
2026-07-16 ZSESW HLA → HLA Jul 16, 05:40 UTCJul 16, 06:55 UTC1h 15m
2026-07-15 ZSESW HLA → HLA Jul 15, 07:40 UTCJul 15, 08:15 UTC35m
2026-07-14 ZSESW HLA → HLA Jul 14, 14:25 UTCJul 14, 15:10 UTC45m
2026-07-14 ZSESW - Jul 14, 11:55 UTCJul 14, 12:55 UTC1h 0m
2026-07-14 ZSESW - Jul 14, 09:40 UTCJul 14, 10:55 UTC1h 15m
2026-07-13 ZSESW - Jul 13, 14:05 UTCJul 13, 14:30 UTC25m
2026-07-13 ZSESW - Jul 13, 09:40 UTCJul 13, 10:20 UTC40m
2026-07-12 ZSESW - Jul 12, 13:35 UTCJul 12, 14:25 UTC50m
2026-07-12 ZSESW - Jul 12, 10:01 UTCJul 12, 10:45 UTC45m
2026-07-10 ZSESW - Jul 10, 14:10 UTCJul 10, 15:50 UTC1h 40m
2026-07-10 ZSESW HLA → HLA Jul 10, 11:10 UTCJul 10, 12:20 UTC1h 10m
2026-07-10 ZSESW HLA → HLA Jul 10, 06:15 UTCJul 10, 06:50 UTC35m
2026-07-03 ZSESW - Jul 3, 10:25 UTCJul 3, 10:35 UTC10m
2026-07-03 ZSESW HLA → HLA Jul 3, 08:00 UTCJul 3, 08:45 UTC45m
2026-07-03 ZSESW HLA → HLA Jul 3, 05:30 UTCJul 3, 06:45 UTC1h 15m
2026-06-24 ZSESW - Jun 24, 13:34 UTCJun 24, 15:14 UTC1h 40m

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 ZS-GBY page for operator, model, and routing details .

Mode-S 00901B frequently asked

What is Mode-S code 00901B?
00901B is an ICAO 24-bit transponder address. Allocated to South Africa. Assigned to ZS-GBY.
Where is Mode-S 00901B registered?
Mode-S code 00901B is allocated to South Africa (ZA). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 00901B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 00901B, octal 00110033, decimal 36,891.
What flights does 00901B operate?
Mode-S 00901B has broadcast 1 distinct callsign, including ZSESW.