Apparatus

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sensors Mode-S transponder

00921B

ICAO 24-bit transponder address · allocated to South Africa

Currently assigned to ZU-NOW · AIRPLANE FACTORY Sling 2

Hex
00921B
Octal
00111033
Decimal
37,403
Country
ZA
Tail
ZU-NOW
Type
SLG2
No current signal · last broadcast Jul 24, 11:55 UTC
Flights observed
169
Distinct callsigns
1
Country
ZA
Last broadcast
Jul 24, 11:55 UTC

Last known position

Most recent position reported by Mode-S 00921B.

Country allocation

The ICAO 24-bit address 00921B 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
ZUNOW - 169 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 ZUNOW HLA → HLA Jul 24, 11:15 UTCJul 24, 11:55 UTC40m
2026-07-22 ZUNOW HLA → HLA Jul 22, 13:25 UTCJul 22, 14:30 UTC1h 5m
2026-07-22 ZUNOW HLA → HLA Jul 22, 11:15 UTCJul 22, 12:10 UTC55m
2026-07-21 ZUNOW - Jul 21, 15:35 UTCJul 21, 15:45 UTC10m
2026-07-21 ZUNOW HLA → HLA Jul 21, 14:50 UTCJul 21, 15:15 UTC25m
2026-07-21 ZUNOW HLA → HLA Jul 21, 12:40 UTCJul 21, 13:20 UTC40m
2026-07-21 ZUNOW HLA → HLA Jul 21, 11:00 UTCJul 21, 11:40 UTC40m
2026-07-21 ZUNOW HLA → HLA Jul 21, 08:55 UTCJul 21, 09:35 UTC40m
2026-07-20 ZUNOW HLA → HLA Jul 20, 19:00 UTCJul 20, 20:05 UTC1h 5m
2026-07-20 ZUNOW HLA → HLA Jul 20, 16:45 UTCJul 20, 17:45 UTC1h 0m
2026-07-20 ZUNOW HLA → HLA Jul 20, 13:00 UTCJul 20, 14:45 UTC1h 45m
2026-07-20 ZUNOW - Jul 20, 07:40 UTCJul 20, 09:20 UTC1h 40m
2026-07-20 ZUNOW - Jul 20, 06:05 UTCJul 20, 06:35 UTC30m
2026-07-19 ZUNOW HLA → HLA Jul 19, 16:50 UTCJul 19, 18:35 UTC1h 45m
2026-07-19 ZUNOW - Jul 19, 14:35 UTCJul 19, 15:25 UTC50m
2026-07-18 ZUNOW HLA → HLA Jul 18, 13:20 UTCJul 18, 14:15 UTC55m
2026-07-16 ZUNOW HLA → HLA Jul 16, 11:10 UTCJul 16, 12:14 UTC1h 5m
2026-07-16 ZUNOW HLA → HLA Jul 16, 09:05 UTCJul 16, 09:50 UTC45m
2026-07-15 ZUNOW HLA → HLA Jul 15, 11:15 UTCJul 15, 11:45 UTC30m
2026-07-14 ZUNOW HLA → HLA Jul 14, 17:00 UTCJul 14, 18:20 UTC1h 20m
2026-07-14 ZUNOW - Jul 14, 15:15 UTCJul 14, 15:35 UTC20m
2026-07-14 ZUNOW HLA → HLA Jul 14, 14:25 UTCJul 14, 15:00 UTC35m
2026-07-14 ZUNOW HLA → HLA Jul 14, 12:35 UTCJul 14, 13:10 UTC35m
2026-07-14 ZUNOW HLA → HLA Jul 14, 09:20 UTCJul 14, 09:50 UTC30m
2026-07-11 ZUNOW HLA → HLA Jul 11, 11:20 UTCJul 11, 11:30 UTC10m
2026-07-10 ZUNOW HLA → HLA Jul 10, 18:50 UTCJul 10, 19:25 UTC35m
2026-07-09 ZUNOW - Jul 9, 18:15 UTCJul 9, 18:35 UTC20m
2026-07-09 ZUNOW - Jul 9, 16:20 UTCJul 9, 16:40 UTC20m
2026-07-09 ZUNOW HLA → HLA Jul 9, 08:55 UTCJul 9, 09:40 UTC45m
2026-07-08 ZUNOW HLA → HLA Jul 8, 16:05 UTCJul 8, 17:05 UTC1h 0m
2026-07-08 ZUNOW HLA → HLA Jul 8, 09:20 UTCJul 8, 10:05 UTC45m
2026-07-07 ZUNOW HLA → HLA Jul 7, 14:45 UTCJul 7, 14:50 UTC5m
2026-07-07 ZUNOW HLA → HLA Jul 7, 12:45 UTCJul 7, 13:40 UTC55m
2026-07-06 ZUNOW - Jul 6, 18:40 UTCJul 6, 19:25 UTC45m
2026-07-06 ZUNOW - Jul 6, 13:00 UTCJul 6, 13:35 UTC35m
2026-07-04 ZUNOW - Jul 4, 09:30 UTCJul 4, 09:40 UTC10m
2026-07-04 ZUNOW HLA → HLA Jul 4, 08:40 UTCJul 4, 09:10 UTC30m
2026-07-02 ZUNOW HLA → HLA Jul 2, 13:40 UTCJul 2, 14:10 UTC30m
2026-07-02 ZUNOW HLA → HLA Jul 2, 09:20 UTCJul 2, 09:50 UTC30m
2026-07-01 ZUNOW - Jul 1, 19:05 UTCJul 1, 19:25 UTC20m
2026-07-01 ZUNOW - Jul 1, 17:25 UTCJul 1, 18:35 UTC1h 10m
2026-07-01 ZUNOW HLA → HLA Jul 1, 13:20 UTCJul 1, 13:45 UTC25m
2026-07-01 ZUNOW HLA → HLA Jul 1, 10:55 UTCJul 1, 11:30 UTC35m
2026-07-01 ZUNOW HLA → HLA Jul 1, 09:10 UTCJul 1, 10:05 UTC55m
2026-06-29 ZUNOW HLA → HLA Jun 29, 10:24 UTCJun 29, 10:29 UTC5m
2026-06-29 ZUNOW HLA → HLA Jun 29, 08:39 UTCJun 29, 09:20 UTC40m
2026-06-28 ZUNOW HLA → HLA Jun 28, 13:10 UTCJun 28, 13:40 UTC30m
2026-06-28 ZUNOW HLA → HLA Jun 28, 10:35 UTCJun 28, 11:14 UTC40m
2026-06-25 ZUNOW HLA → HLA Jun 25, 07:15 UTCJun 25, 07:59 UTC45m
2026-06-24 ZUNOW HLA → HLA Jun 24, 14:45 UTCJun 24, 15:29 UTC45m

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 ZU-NOW page for operator, model, and routing details .

Mode-S 00921B frequently asked

What is Mode-S code 00921B?
00921B is an ICAO 24-bit transponder address. Allocated to South Africa. Assigned to ZU-NOW.
Where is Mode-S 00921B registered?
Mode-S code 00921B 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 00921B broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 11:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 00921B, octal 00111033, decimal 37,403.
What flights does 00921B operate?
Mode-S 00921B has broadcast 1 distinct callsign, including ZUNOW.