Apparatus

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sensors Mode-S transponder

00ACE4

ICAO 24-bit transponder address · allocated to South Africa

Currently assigned to ZS-CMZ · BOMBARDIER Regional Jet CRJ-200

Hex
00ACE4
Octal
00126344
Decimal
44,260
Country
ZA
Tail
ZS-CMZ
Type
CRJ2
No current signal · last broadcast 3d ago
Flights observed
139
Distinct callsigns
20
Country
ZA
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 00ACE4.

Country allocation

The ICAO 24-bit address 00ACE4 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 20 distinct

Callsign Airline Flights Last seen
KEM904 CemAir 10 2026-07-25
KEM839 CemAir 10 2026-07-26
KEM834 CemAir 8 2026-07-19
KEM905 - 7 2026-07-09
KEM840 CemAir 7 2026-07-26
KEM831 - 7 2026-06-30
KEM991 CemAir 6 2026-07-21
KEM981 CemAir 6 2026-07-18
KEM992 - 5 2026-07-22
KEM980 CemAir 5 2026-05-13
KEM901 - 5 2026-07-10
KEM900 CemAir 5 2026-07-24
KEM764 - 4 2026-07-03
KEM450 CemAir 4 2026-05-12
KEM - 4 2026-05-18
KEM985 CemAir 3 2026-05-23
KEM984 CemAir 3 2026-05-23
KEM451 CemAir 3 2026-05-13
KEM324 - 3 2026-07-13
KEM518 CemAir 2 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KEM840 JNB → CPT Jul 26, 14:20 UTCJul 26, 16:25 UTC2h 5m
2026-07-26 KEM839 CPT → JNB Jul 26, 11:35 UTCJul 26, 13:30 UTC1h 55m
2026-07-25 KEM904 CPT → DUR Jul 25, 07:55 UTCJul 25, 12:30 UTC4h 35m
2026-07-24 KEM904 CPT → DUR Jul 24, 09:35 UTCJul 24, 14:15 UTC4h 40m
2026-07-24 KEM900 CPT → DUR Jul 24, 04:10 UTCJul 24, 08:55 UTC4h 45m
2026-07-23 KEM840 JNB → CPT Jul 23, 14:15 UTCJul 23, 16:20 UTC2h 5m
2026-07-23 KEM839 CPT → JNB Jul 23, 11:35 UTCJul 23, 13:10 UTC1h 35m
2026-07-22 KEM992 - Jul 22, 11:10 UTCJul 22, 12:55 UTC1h 45m
2026-07-21 KEM992 - Jul 21, 10:45 UTCJul 21, 12:50 UTC2h 5m
2026-07-21 KEM991 CPT → HDS Jul 21, 07:30 UTCJul 21, 09:20 UTC1h 50m
2026-07-20 KEM992 - Jul 20, 11:20 UTCJul 20, 13:50 UTC2h 30m
2026-07-20 KEM991 - Jul 20, 08:10 UTCJul 20, 09:50 UTC1h 40m
2026-07-20 KEM243 ELS → CPT Jul 20, 04:05 UTCJul 20, 07:30 UTC3h 25m
2026-07-19 KEM840 JNB → CPT Jul 19, 14:20 UTCJul 19, 16:35 UTC2h 15m
2026-07-19 KEM839 CPT → JNB Jul 19, 11:50 UTCJul 19, 13:25 UTC1h 35m
2026-07-19 KEM834 JNB → CPT Jul 19, 09:00 UTCJul 19, 11:15 UTC2h 15m
2026-07-18 KEM981 HDS → JNB Jul 18, 11:10 UTCJul 18, 13:10 UTC2h 0m
2026-07-17 KEM107 - Jul 17, 11:30 UTCJul 17, 11:50 UTC20m
2026-07-17 KEM106 - Jul 17, 10:05 UTCJul 17, 10:20 UTC15m
2026-07-16 KEM329 - Jul 16, 15:00 UTCJul 16, 15:30 UTC30m
2026-07-13 KEM324 - Jul 13, 07:45 UTCJul 13, 08:10 UTC25m
2026-07-12 KEM333 - Jul 12, 14:50 UTCJul 12, 17:15 UTC2h 25m
2026-07-12 KEM329 - Jul 12, 13:15 UTCJul 12, 13:45 UTC30m
2026-07-11 KEM001 - Jul 11, 14:20 UTCJul 11, 14:40 UTC20m
2026-07-10 KEM904 CPT → CPT Jul 10, 15:10 UTCJul 10, 19:40 UTC4h 30m
2026-07-10 KEM904 CPT → CPT Jul 10, 09:40 UTCJul 10, 14:20 UTC4h 40m
2026-07-10 KEM901 - Jul 10, 08:15 UTCJul 10, 08:35 UTC20m
2026-07-10 KEM900 - Jul 10, 04:05 UTCJul 10, 04:20 UTC15m
2026-07-09 KEM905 CPT → CPT Jul 9, 09:40 UTCJul 9, 14:20 UTC4h 40m
2026-07-09 KEM901 - Jul 9, 08:25 UTCJul 9, 08:50 UTC25m
2026-07-09 KEM900 - Jul 9, 04:15 UTCJul 9, 04:30 UTC15m
2026-07-08 KEM906 CPT → CPT Jul 8, 16:05 UTCJul 8, 20:45 UTC4h 40m
2026-07-08 KEM905 CPT → CPT Jul 8, 10:45 UTCJul 8, 15:20 UTC4h 35m
2026-07-08 KEM901 - Jul 8, 05:05 UTCJul 8, 09:50 UTC4h 45m
2026-07-07 KEM905 - Jul 7, 15:15 UTCJul 7, 15:40 UTC25m
2026-07-07 KEM904 - Jul 7, 11:00 UTCJul 7, 11:20 UTC20m
2026-07-07 KEM900 - Jul 7, 05:30 UTCJul 7, 10:15 UTC4h 45m
2026-07-06 KEM905 - Jul 6, 09:50 UTCJul 6, 14:20 UTC4h 30m
2026-07-06 KEM901 - Jul 6, 04:40 UTCJul 6, 09:00 UTC4h 20m
2026-07-05 KEM840 - Jul 5, 14:15 UTCJul 5, 16:15 UTC2h 0m
2026-07-05 KEM839 CPT → JNB Jul 5, 11:40 UTCJul 5, 13:30 UTC1h 50m
2026-07-05 KEM834 - Jul 5, 09:00 UTCJul 5, 11:00 UTC2h 0m
2026-07-04 KEM324 - Jul 4, 07:50 UTCJul 4, 15:30 UTC7h 40m
2026-07-03 KEM109 - Jul 3, 15:55 UTCJul 3, 16:10 UTC15m
2026-07-03 KEM109 - Jul 3, 14:05 UTCJul 3, 14:20 UTC15m
2026-07-03 KEM764 - Jul 3, 08:40 UTCJul 3, 12:25 UTC3h 45m
2026-07-03 KEM205 - Jul 3, 06:55 UTCJul 3, 07:20 UTC25m
2026-07-02 KEM204 - Jul 2, 16:15 UTCJul 2, 16:30 UTC15m
2026-07-02 KEM764 - Jul 2, 08:45 UTCJul 2, 12:20 UTC3h 35m
2026-07-01 KEM204 - Jul 1, 15:40 UTCJul 2, 06:25 UTC14h 45m

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-CMZ page for operator, model, and routing details .

Mode-S 00ACE4 frequently asked

What is Mode-S code 00ACE4?
00ACE4 is an ICAO 24-bit transponder address. Allocated to South Africa. Assigned to ZS-CMZ.
Where is Mode-S 00ACE4 registered?
Mode-S code 00ACE4 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 00ACE4 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 00ACE4, octal 00126344, decimal 44,260.
What flights does 00ACE4 operate?
Mode-S 00ACE4 has broadcast 20 distinct callsigns, including KEM904, KEM839, KEM834, KEM905, KEM840.