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sensors Mode-S transponder

8A021D

ICAO 24-bit transponder address · allocated to Indonesia

Currently assigned to PK-GFD · BOEING 737-800

Hex
8A021D
Octal
42401035
Decimal
9,044,509
Country
ID
Tail
PK-GFD
Type
B738
No current signal · last broadcast Jul 26, 13:45 UTC
Flights observed
249
Distinct callsigns
20
Country
ID
Last broadcast
Jul 26, 13:45 UTC

Last known position

Most recent position reported by Mode-S 8A021D.

Country allocation

The ICAO 24-bit address 8A021D falls within the block assigned to Indonesia (ID) by ICAO Annex 10, Volume III. Every aircraft registered in Indonesia 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
GIA165 - 6 2026-07-18
GIA829 Garuda Indonesia 5 2026-06-02
GIA867 - 4 2026-07-13
GIA866 - 4 2026-07-13
GIA821 Garuda Indonesia 4 2026-05-11
GIA647 Garuda Indonesia 4 2026-07-24
GIA551 - 4 2026-07-24
GIA422 - 4 2026-07-19
GIA183 Garuda Indonesia 4 2026-07-24
GIA179 - 4 2026-07-10
GIA176 - 4 2026-07-10
GIA162 - 4 2026-07-18
GIA155 - 4 2026-07-16
GIA828 Garuda Indonesia 3 2026-06-02
GIA7644 - 3 2026-07-07
GIA581 Garuda Indonesia 3 2026-06-03
GIA457 Garuda Indonesia 3 2026-07-23
GIA456 Garuda Indonesia 3 2026-07-23
GIA433 - 3 2026-07-05
GIA419 - 3 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GIA414 CGK → DPS Jul 26, 09:30 UTCJul 26, 13:45 UTC4h 15m
2026-07-26 GIA209 YIA → CGK Jul 26, 06:50 UTCJul 26, 07:45 UTC55m
2026-07-26 GIA208 CGK → YIA Jul 26, 04:55 UTCJul 26, 05:15 UTC20m
2026-07-25 GIA606 CGK → MDC Jul 25, 19:15 UTCJul 26, 02:35 UTC7h 20m
2026-07-25 GIA414 CGK → DPS Jul 25, 09:15 UTCJul 25, 13:50 UTC4h 35m
2026-07-25 GIA149 PDG → CGK Jul 25, 06:35 UTCJul 25, 06:55 UTC20m
2026-07-25 GIA149 PDG → CGK Jul 25, 05:25 UTCJul 25, 05:55 UTC30m
2026-07-25 GIA148 CGK → BTH Jul 25, 03:35 UTCJul 25, 03:45 UTC10m
2026-07-25 GIA148 CGK → BTH Jul 25, 02:45 UTCJul 25, 03:00 UTC15m
2026-07-24 GIA183 KNO → CGK Jul 24, 23:25 UTCJul 25, 00:30 UTC1h 5m
2026-07-24 GIA196 CGK → KNO Jul 24, 12:35 UTCJul 24, 14:15 UTC1h 40m
2026-07-24 GIA647 AMQ → CGK Jul 24, 03:10 UTCJul 24, 10:45 UTC7h 35m
2026-07-24 GIA551 - Jul 24, 01:25 UTCJul 24, 01:45 UTC20m
2026-07-23 GIA457 KOE → CGK Jul 23, 06:20 UTCJul 23, 06:35 UTC15m
2026-07-23 GIA456 CGK → KOE Jul 23, 00:00 UTCJul 23, 00:45 UTC45m
2026-07-22 GIA839 SIN → CGK Jul 22, 15:00 UTCJul 22, 15:15 UTC15m
2026-07-22 GIA839 SIN → CGK Jul 22, 14:10 UTCJul 22, 14:25 UTC15m
2026-07-22 GIA838 - Jul 22, 11:20 UTCJul 22, 12:05 UTC45m
2026-07-22 GIA564 CGK → BPN Jul 22, 01:55 UTCJul 22, 02:05 UTC10m
2026-07-22 GIA101 PLM → CGK Jul 22, 00:15 UTCJul 22, 00:30 UTC15m
2026-07-21 GIA112 CGK → PLM Jul 21, 11:45 UTCJul 21, 11:55 UTC10m
2026-07-21 GIA537 - Jul 21, 10:15 UTCJul 21, 10:30 UTC15m
2026-07-21 GIA225 - Jul 21, 04:05 UTCJul 21, 05:00 UTC55m
2026-07-21 GIA222 CGK → SOC Jul 21, 02:15 UTCJul 21, 03:05 UTC50m
2026-07-20 GIA426 CGK → DPS Jul 20, 11:50 UTCJul 21, 00:45 UTC12h 54m
2026-07-20 GIA647 - Jul 20, 10:00 UTCJul 20, 10:15 UTC15m
2026-07-20 GIA646 - Jul 20, 02:55 UTCJul 20, 03:20 UTC25m
2026-07-19 GIA183 KNO → CGK Jul 19, 23:20 UTCJul 20, 01:10 UTC1h 50m
2026-07-19 GIA196 - Jul 19, 12:50 UTCJul 19, 14:25 UTC1h 35m
2026-07-19 GIA422 - Jul 19, 06:55 UTCJul 19, 11:25 UTC4h 30m
2026-07-19 GIA610 CGK → UPG Jul 19, 00:20 UTCJul 19, 05:35 UTC5h 15m
2026-07-18 GIA165 - Jul 18, 11:50 UTCJul 18, 12:10 UTC20m
2026-07-18 GIA165 - Jul 18, 10:45 UTCJul 18, 11:15 UTC30m
2026-07-18 GIA162 - Jul 18, 08:00 UTCJul 18, 08:55 UTC55m
2026-07-18 GIA645 - Jul 18, 04:30 UTCJul 18, 04:45 UTC15m
2026-07-17 GIA325 - Jul 17, 13:10 UTCJul 17, 13:25 UTC15m
2026-07-17 GIA320 - Jul 17, 09:35 UTCJul 17, 10:15 UTC40m
2026-07-17 GIA187 - Jul 17, 06:15 UTCJul 17, 08:04 UTC1h 50m
2026-07-17 GIA184 - Jul 17, 02:50 UTCJul 17, 04:25 UTC1h 35m
2026-07-17 GIA617 - Jul 17, 01:15 UTCJul 17, 01:29 UTC15m
2026-07-16 GIA616 - Jul 16, 11:15 UTCJul 16, 11:40 UTC25m
2026-07-16 GIA155 - Jul 16, 09:30 UTCJul 16, 09:50 UTC20m
2026-07-16 GIA155 - Jul 16, 08:40 UTCJul 16, 08:55 UTC15m
2026-07-16 GIA152 - Jul 16, 06:05 UTCJul 16, 07:05 UTC1h 0m
2026-07-16 GIA607 - Jul 16, 02:35 UTCJul 16, 02:50 UTC15m
2026-07-15 GIA606 - Jul 15, 19:25 UTCJul 15, 20:00 UTC35m
2026-07-15 GIA119 - Jul 15, 12:25 UTCJul 15, 12:40 UTC15m
2026-07-15 GIA114 - Jul 15, 10:00 UTCJul 15, 10:15 UTC15m
2026-07-15 GIA567 - Jul 15, 06:45 UTCJul 15, 07:00 UTC15m
2026-07-15 GIA533 - Jul 15, 00:30 UTCJul 15, 00:45 UTC15m

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 PK-GFD page for operator, model, and routing details .

Mode-S 8A021D frequently asked

What is Mode-S code 8A021D?
8A021D is an ICAO 24-bit transponder address. Allocated to Indonesia. Assigned to PK-GFD.
Where is Mode-S 8A021D registered?
Mode-S code 8A021D is allocated to Indonesia (ID). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8A021D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8A021D, octal 42401035, decimal 9,044,509.
What flights does 8A021D operate?
Mode-S 8A021D has broadcast 20 distinct callsigns, including GIA165, GIA829, GIA867, GIA866, GIA821.