Apparatus

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sensors Mode-S transponder

75021B

ICAO 24-bit transponder address · allocated to Malaysia

Currently assigned to 9M-MXQ · BOEING 737-800

Hex
75021B
Octal
35201033
Decimal
7,668,251
Country
MY
Tail
9M-MXQ
Type
B738
Broadcasting now · callsign MAS2660 · 31,975 ft
Flights observed
188
Distinct callsigns
20
Country
MY
Last broadcast
1h ago

Current position

75021B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 75021B falls within the block assigned to Malaysia (MY) by ICAO Annex 10, Volume III. Every aircraft registered in Malaysia 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
MAS1137 Malaysia Airlines 5 2026-05-13
MAS610 Malaysia Airlines 4 2026-05-16
MAS607 Malaysia Airlines 4 2026-05-16
MAS1194 Malaysia Airlines 4 2026-05-13
MAS865 Malaysia Airlines 3 2026-05-10
MAS807 - 3 2026-04-13
MAS763 Malaysia Airlines 3 2026-05-06
MAS762 Malaysia Airlines 3 2026-05-06
MAS727 Malaysia Airlines 3 2026-05-19
MAS2664 Malaysia Airlines 3 2026-05-14
MAS2635 Malaysia Airlines 3 2026-05-23
MAS2634 Malaysia Airlines 3 2026-05-23
MAS864 Malaysia Airlines 2 2026-05-10
MAS847 Malaysia Airlines 2 2026-05-25
MAS792 Malaysia Airlines 2 2026-05-28
MAS791 Malaysia Airlines 2 2026-05-22
MAS790 Malaysia Airlines 2 2026-05-22
MAS789 Malaysia Airlines 2 2026-04-27
MAS788 Malaysia Airlines 2 2026-04-27
MAS773 Malaysia Airlines 2 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 MAS2660 KUL → TWU May 29, 23:30 UTCMay 29, 23:50 UTC20m
2026-05-29 MAS2585 MYY → KUL May 29, 09:40 UTCMay 29, 14:30 UTC4h 50m
2026-05-29 MAS7453 KCH → KUL May 29, 03:40 UTCMay 29, 07:40 UTC4h 0m
2026-05-28 MAS2522 KUL → KCH May 28, 11:45 UTCMay 28, 23:15 UTC11h 30m
2026-05-28 MAS793 CNX → KUL May 28, 07:35 UTCMay 28, 10:00 UTC2h 25m
2026-05-28 MAS792 KUL → CNX May 28, 05:05 UTCMay 28, 06:20 UTC1h 15m
2026-05-28 MAS792 KUL → CNX May 28, 03:55 UTCMay 28, 04:05 UTC10m
2026-05-28 MAS1038 JHB → KUL May 28, 01:55 UTCMay 28, 02:20 UTC25m
2026-05-28 MAS1037 KUL → JHB May 28, 00:10 UTCMay 28, 00:35 UTC25m
2026-05-27 MAS1058 JHB → KUL May 27, 12:05 UTCMay 27, 12:30 UTC25m
2026-05-27 MAS1057 KUL → JHB May 27, 10:20 UTCMay 27, 10:45 UTC25m
2026-05-27 MAS624 SIN → KUL May 27, 07:45 UTCMay 27, 08:25 UTC40m
2026-05-27 MAS623 KUL → SIN May 27, 05:29 UTCMay 27, 06:04 UTC35m
2026-05-27 MAS712 CGK → KUL May 27, 03:04 UTCMay 27, 03:59 UTC55m
2026-05-26 MAS713 KUL → CGK May 26, 23:35 UTCMay 27, 00:25 UTC50m
2026-05-26 MAS722 CGK → KUL May 26, 11:39 UTCMay 26, 13:24 UTC1h 45m
2026-05-26 MAS723 KUL → CGK May 26, 08:24 UTCMay 26, 09:15 UTC50m
2026-05-25 MAS847 KUL → UPG May 25, 22:10 UTCMay 26, 05:10 UTC7h 0m
2026-05-25 MAS724 CGK → KUL May 25, 13:15 UTCMay 25, 15:00 UTC1h 45m
2026-05-25 MAS725 KUL → CGK May 25, 10:15 UTCMay 25, 11:15 UTC1h 0m
2026-05-25 MAS795 HKT → KUL May 25, 08:30 UTCMay 25, 09:00 UTC30m
2026-05-25 MAS794 KUL → HKT May 25, 05:05 UTCMay 25, 05:20 UTC15m
2026-05-25 MAS2543 KCH → KUL May 25, 03:05 UTCMay 25, 03:40 UTC35m
2026-05-24 MAS2645 BKI → KUL May 24, 12:10 UTCMay 24, 12:45 UTC35m
2026-05-24 MAS2645 BKI → KUL May 24, 10:35 UTCMay 24, 10:50 UTC15m
2026-05-24 MAS2616 KUL → BKI May 24, 09:10 UTCMay 24, 09:30 UTC20m
2026-05-24 MAS2616 KUL → BKI May 24, 07:15 UTCMay 24, 07:45 UTC30m
2026-05-24 MAS787 HKT → KUL May 24, 04:25 UTCMay 24, 04:40 UTC15m
2026-05-23 MAS2635 LBU → KUL May 23, 12:40 UTCMay 23, 13:10 UTC30m
2026-05-23 MAS2634 KUL → LBU May 23, 08:05 UTCMay 23, 08:35 UTC30m
2026-05-22 MAS847 KUL → UPG May 22, 22:15 UTCMay 23, 05:30 UTC7h 14m
2026-05-22 MAS791 HKT → KUL May 22, 13:35 UTCMay 22, 13:50 UTC15m
2026-05-22 MAS790 KUL → HKT May 22, 10:25 UTCMay 22, 10:35 UTC10m
2026-05-22 MAS2711 SDK → KUL May 22, 06:30 UTCMay 22, 09:00 UTC2h 30m
2026-05-22 MAS2710 KUL → SDK May 22, 02:45 UTCMay 22, 04:55 UTC2h 10m
2026-05-22 MAS1133 PEN → KUL May 22, 00:15 UTCMay 22, 00:30 UTC15m
2026-05-21 MAS1166 KUL → PEN May 21, 13:20 UTCMay 21, 13:35 UTC15m
2026-05-21 MAS391 - May 21, 01:05 UTCMay 21, 10:40 UTC9h 35m
2026-05-20 MAS724 CGK → KUL May 20, 13:10 UTCMay 20, 14:55 UTC1h 45m
2026-05-20 MAS725 KUL → CGK May 20, 10:05 UTCMay 20, 11:00 UTC55m
2026-05-20 MAS773 CNX → KUL May 20, 08:05 UTCMay 20, 08:25 UTC20m
2026-05-20 MAS773 CNX → KUL May 20, 05:55 UTCMay 20, 07:00 UTC1h 5m
2026-05-20 MAS772 KUL → CNX May 20, 03:35 UTCMay 20, 04:50 UTC1h 16m
2026-05-19 MAS726 CGK → KUL May 19, 21:30 UTCMay 19, 23:10 UTC1h 40m
2026-05-19 MAS727 KUL → CGK May 19, 14:10 UTCMay 19, 15:50 UTC1h 40m
2026-05-19 MAS2635 LBU → KUL May 19, 10:30 UTCMay 19, 12:35 UTC2h 5m
2026-05-19 MAS2634 KUL → LBU May 19, 07:10 UTCMay 19, 09:15 UTC2h 5m
2026-05-19 MAS2716 KUL → SBW May 19, 00:45 UTCMay 19, 04:50 UTC4h 5m
2026-05-18 MAS2593 MYY → KUL May 18, 06:55 UTCMay 18, 11:50 UTC4h 55m
2026-05-18 MAS2613 BKI → KUL May 18, 01:35 UTCMay 18, 03:45 UTC2h 10m

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 9M-MXQ page for operator, model, and routing details .

Mode-S 75021B frequently asked

What is Mode-S code 75021B?
75021B is an ICAO 24-bit transponder address. Allocated to Malaysia. Assigned to 9M-MXQ.
Where is Mode-S 75021B registered?
Mode-S code 75021B is allocated to Malaysia (MY). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 75021B broadcasting right now?
Yes. Mode-S 75021B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 75021B, octal 35201033, decimal 7,668,251.
What flights does 75021B operate?
Mode-S 75021B has broadcast 20 distinct callsigns, including MAS1137, MAS610, MAS607, MAS1194, MAS865.