Apparatus

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sensors Mode-S transponder

8990C5

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-55575 · DE HAVILLAND DHC-6 Twin Otter

Hex
8990C5
Octal
42310305
Decimal
9,015,493
Country
TW
Tail
B-55575
Type
DHC6
No current signal · last broadcast 6d ago
Flights observed
190
Distinct callsigns
16
Country
TW
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S 8990C5.

Country allocation

The ICAO 24-bit address 8990C5 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 16 distinct

Callsign Airline Flights Last seen
DA7011 - 33 2026-07-17
DA7012 - 30 2026-07-17
DA7009 - 29 2026-07-16
DA7010 - 27 2026-07-16
DA7001 - 12 2026-07-17
DA7002 - 11 2026-07-17
DA7019 - 8 2026-07-13
B55575 - 8 2026-07-18
DA7020 - 7 2026-07-13
DA7016 - 6 2026-07-17
DA7006 - 5 2026-07-17
DA7005 - 5 2026-07-17
DA7022 - 3 2026-07-16
DA7021 - 3 2026-07-16
DA7017 - 2 2026-07-12
B55573 - 1 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 B55575 - Jul 18, 00:04 UTCJul 18, 00:25 UTC20m
2026-07-17 DA7012 - Jul 17, 08:20 UTCJul 17, 08:54 UTC35m
2026-07-17 DA7016 - Jul 17, 06:25 UTCJul 17, 06:45 UTC20m
2026-07-17 DA7011 - Jul 17, 05:15 UTCJul 17, 05:45 UTC30m
2026-07-17 DA7006 - Jul 17, 03:34 UTCJul 17, 03:55 UTC20m
2026-07-17 DA7005 - Jul 17, 02:30 UTCJul 17, 02:54 UTC25m
2026-07-17 DA7002 - Jul 17, 01:20 UTCJul 17, 01:45 UTC25m
2026-07-17 DA7001 - Jul 17, 00:10 UTCJul 17, 00:35 UTC25m
2026-07-16 B55575 - Jul 16, 08:20 UTCJul 16, 08:45 UTC25m
2026-07-16 DA7011 - Jul 16, 05:25 UTCJul 16, 05:55 UTC30m
2026-07-16 DA7010 - Jul 16, 03:45 UTCJul 16, 04:15 UTC30m
2026-07-16 DA7009 - Jul 16, 02:40 UTCJul 16, 03:10 UTC30m
2026-07-16 DA7022 - Jul 16, 01:15 UTCJul 16, 01:40 UTC25m
2026-07-16 DA7021 - Jul 16, 00:10 UTCJul 16, 00:40 UTC30m
2026-07-15 DA7012 - Jul 15, 08:15 UTCJul 15, 08:40 UTC25m
2026-07-15 DA7011 - Jul 15, 05:15 UTCJul 15, 05:45 UTC30m
2026-07-15 DA7010 - Jul 15, 03:45 UTCJul 15, 04:10 UTC25m
2026-07-15 DA7009 - Jul 15, 02:35 UTCJul 15, 03:05 UTC30m
2026-07-15 DA7022 - Jul 15, 01:15 UTCJul 15, 01:40 UTC25m
2026-07-15 DA7021 - Jul 15, 00:15 UTCJul 15, 00:40 UTC25m
2026-07-14 DA7012 KHH → KHH Jul 14, 09:50 UTCJul 14, 10:00 UTC10m
2026-07-14 DA7012 - Jul 14, 09:20 UTCJul 14, 09:45 UTC25m
2026-07-14 DA7016 - Jul 14, 06:30 UTCJul 14, 06:45 UTC15m
2026-07-14 DA7011 - Jul 14, 05:35 UTCJul 14, 06:00 UTC25m
2026-07-14 DA7010 - Jul 14, 03:40 UTCJul 14, 04:05 UTC25m
2026-07-14 DA7009 - Jul 14, 02:40 UTCJul 14, 03:05 UTC25m
2026-07-14 DA7022 - Jul 14, 01:20 UTCJul 14, 01:45 UTC25m
2026-07-14 DA7021 - Jul 14, 00:10 UTCJul 14, 00:40 UTC30m
2026-07-13 DA7020 - Jul 13, 01:25 UTCJul 13, 01:45 UTC20m
2026-07-13 DA7019 - Jul 13, 00:15 UTCJul 13, 00:35 UTC20m
2026-07-12 DA7012 - Jul 12, 08:20 UTCJul 12, 08:55 UTC35m
2026-07-12 DA7017 - Jul 12, 07:20 UTCJul 12, 07:31 UTC10m
2026-07-12 DA7011 - Jul 12, 05:35 UTCJul 12, 06:40 UTC1h 5m
2026-07-12 DA7010 - Jul 12, 03:40 UTCJul 12, 04:01 UTC20m
2026-07-12 DA7009 - Jul 12, 02:35 UTCJul 12, 03:01 UTC25m
2026-07-12 DA7002 - Jul 12, 01:15 UTCJul 12, 01:40 UTC25m
2026-07-12 DA7001 - Jul 12, 00:15 UTCJul 12, 00:35 UTC20m
2026-07-09 DA7012 - Jul 9, 08:20 UTCJul 9, 08:50 UTC30m
2026-07-09 DA7017 - Jul 9, 07:15 UTCJul 9, 07:30 UTC15m
2026-07-09 DA7011 - Jul 9, 05:25 UTCJul 9, 05:55 UTC30m
2026-07-09 DA7010 - Jul 9, 03:45 UTCJul 9, 04:05 UTC20m
2026-07-09 DA7009 - Jul 9, 02:35 UTCJul 9, 03:05 UTC30m
2026-07-09 DA7002 - Jul 9, 01:20 UTCJul 9, 01:45 UTC25m
2026-07-09 DA7001 - Jul 9, 00:10 UTCJul 9, 00:35 UTC25m
2026-07-08 DA7012 - Jul 8, 08:15 UTCJul 8, 08:55 UTC40m
2026-07-08 DA7011 - Jul 8, 05:30 UTCJul 8, 05:55 UTC25m
2026-07-08 DA7010 - Jul 8, 03:50 UTCJul 8, 04:15 UTC25m
2026-07-08 DA7009 - Jul 8, 02:45 UTCJul 8, 03:10 UTC25m
2026-07-08 DA7020 - Jul 8, 01:15 UTCJul 8, 01:30 UTC15m
2026-07-08 DA7019 - Jul 8, 00:05 UTCJul 8, 00:30 UTC25m

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-55575 page for operator, model, and routing details .

Mode-S 8990C5 frequently asked

What is Mode-S code 8990C5?
8990C5 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-55575.
Where is Mode-S 8990C5 registered?
Mode-S code 8990C5 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990C5 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990C5, octal 42310305, decimal 9,015,493.
What flights does 8990C5 operate?
Mode-S 8990C5 has broadcast 16 distinct callsigns, including DA7011, DA7012, DA7009, DA7010, DA7001.