Apparatus

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sensors Mode-S transponder

8990B9

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-16979 · AGUSTA AW-169

Hex
8990B9
Octal
42310271
Decimal
9,015,481
Country
TW
Tail
B-16979
Type
A169
No current signal · last broadcast 3h ago
Flights observed
99
Distinct callsigns
2
Country
TW
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 8990B9.

Country allocation

The ICAO 24-bit address 8990B9 falls within the block assigned to Taiwan (TW) by ICAO Annex 10, Volume III. Every aircraft registered in Taiwan 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 2 distinct

Callsign Airline Flights Last seen
DOCH07 - 80 2026-07-11
DOCT07A - 18 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 DOCT07A SWU → SWU Jul 23, 09:45 UTCJul 23, 10:15 UTC30m
2026-07-20 DOCT07A - Jul 20, 01:45 UTCJul 20, 02:10 UTC25m
2026-07-19 DOCT07A - Jul 19, 08:45 UTCJul 19, 09:20 UTC35m
2026-07-18 DOCT07A - Jul 18, 08:30 UTCJul 18, 09:05 UTC35m
2026-07-17 DOCT07A - Jul 17, 05:35 UTCJul 17, 06:10 UTC35m
2026-07-17 DOCT07A - Jul 17, 02:25 UTCJul 17, 03:05 UTC40m
2026-07-16 DOCT07A SWU → SWU Jul 16, 07:55 UTCJul 16, 08:30 UTC35m
2026-07-16 DOCT07A - Jul 16, 05:20 UTCJul 16, 05:45 UTC25m
2026-07-15 DOCT07A - Jul 15, 09:35 UTCJul 15, 10:05 UTC30m
2026-07-14 DOCT07A - Jul 14, 01:20 UTCJul 14, 02:00 UTC40m
2026-07-13 DOCT07A - Jul 13, 23:30 UTCJul 14, 00:15 UTC45m
2026-07-13 DOCT07A - Jul 13, 21:00 UTCJul 13, 21:45 UTC45m
2026-07-13 DOCT07A - Jul 13, 08:20 UTCJul 13, 09:05 UTC45m
2026-07-13 DOCT07A - Jul 13, 06:20 UTCJul 13, 06:50 UTC30m
2026-07-13 DOCT07A - Jul 13, 03:20 UTCJul 13, 03:50 UTC30m
2026-07-12 DOCT07A SWU → SWU Jul 12, 06:55 UTCJul 12, 07:35 UTC40m
2026-07-12 DOCT07A - Jul 12, 00:25 UTCJul 12, 01:05 UTC40m
2026-07-11 DOCT07A - Jul 11, 22:50 UTCJul 11, 23:30 UTC40m
2026-07-11 DOCH07 - Jul 11, 08:10 UTCJul 11, 08:40 UTC30m
2026-07-11 DOCH07 - Jul 11, 06:15 UTCJul 11, 06:30 UTC15m
2026-07-11 DOCH07 - Jul 11, 05:20 UTCJul 11, 05:50 UTC30m
2026-07-10 DOCH07 - Jul 10, 08:45 UTCJul 10, 09:25 UTC40m
2026-07-06 DOCH07 - Jul 6, 07:00 UTCJul 6, 07:35 UTC35m
2026-07-02 DOCH07 - Jul 2, 05:55 UTCJul 2, 06:30 UTC35m
2026-07-01 DOCH07 SWU → SWU Jul 1, 07:10 UTCJul 1, 08:05 UTC55m
2026-06-30 DOCH07 - Jun 30, 05:45 UTCJun 30, 06:20 UTC35m
2026-06-29 DOCH07 - Jun 29, 23:25 UTCJun 30, 00:00 UTC35m
2026-06-29 DOCH07 - Jun 29, 09:05 UTCJun 29, 09:54 UTC50m
2026-06-29 DOCH07 - Jun 29, 03:25 UTCJun 29, 03:54 UTC30m
2026-06-27 DOCH07 - Jun 27, 06:35 UTCJun 27, 07:15 UTC40m
2026-06-26 DOCH07 - Jun 26, 04:55 UTCJun 26, 05:35 UTC40m
2026-06-25 DOCH07 - Jun 25, 23:05 UTCJun 25, 23:59 UTC55m
2026-06-25 DOCH07 SWU → SWU Jun 25, 05:39 UTCJun 25, 06:09 UTC30m
2026-06-25 DOCH07 - Jun 25, 01:09 UTCJun 25, 01:44 UTC35m
2026-06-24 DOCH07 - Jun 24, 06:15 UTCJun 24, 06:55 UTC40m
2026-06-23 DOCH07 - Jun 23, 02:09 UTCJun 23, 02:49 UTC40m
2026-06-22 DOCH07 - Jun 22, 06:05 UTCJun 22, 07:00 UTC55m
2026-06-21 DOCH07 - Jun 21, 23:10 UTCJun 21, 23:44 UTC35m
2026-06-21 DOCH07 - Jun 21, 09:15 UTCJun 21, 09:55 UTC40m
2026-06-20 DOCH07 - Jun 20, 22:30 UTCJun 20, 22:59 UTC30m
2026-06-19 DOCH07 - Jun 19, 04:39 UTCJun 19, 05:09 UTC30m
2026-06-19 DOCH07 - Jun 19, 03:24 UTCJun 19, 04:00 UTC35m
2026-06-18 DOCH07 - Jun 18, 08:40 UTCJun 18, 09:25 UTC45m
2026-06-18 DOCH07 - Jun 18, 07:15 UTCJun 18, 07:45 UTC30m
2026-06-18 DOCH07 - Jun 18, 01:15 UTCJun 18, 01:55 UTC40m
2026-06-17 DOCH07 - Jun 17, 08:05 UTCJun 17, 08:45 UTC40m
2026-06-17 DOCH07 SWU → SWU Jun 17, 06:30 UTCJun 17, 07:20 UTC50m
2026-06-17 DOCH07 SWU → SWU Jun 17, 03:05 UTCJun 17, 03:40 UTC35m
2026-06-16 DOCH07 - Jun 16, 04:20 UTCJun 16, 04:55 UTC35m
2026-06-16 DOCH07 SWU → SWU Jun 16, 01:00 UTCJun 16, 01:50 UTC50m

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 B-16979 page for operator, model, and routing details .

Mode-S 8990B9 frequently asked

What is Mode-S code 8990B9?
8990B9 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-16979.
Where is Mode-S 8990B9 registered?
Mode-S code 8990B9 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990B9 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990B9, octal 42310271, decimal 9,015,481.
What flights does 8990B9 operate?
Mode-S 8990B9 has broadcast 2 distinct callsigns, including DOCH07, DOCT07A.