Apparatus

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sensors Mode-S transponder

8990C3

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-55571 · DE HAVILLAND DHC-6 Twin Otter

Hex
8990C3
Octal
42310303
Decimal
9,015,491
Country
TW
Tail
B-55571
Type
DHC6
No current signal · last broadcast 24d ago
Flights observed
70
Distinct callsigns
16
Country
TW
Last broadcast
24d ago

Last known position

Most recent position reported by Mode-S 8990C3.

Country allocation

The ICAO 24-bit address 8990C3 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 - 12 2026-06-24
DA7012 - 11 2026-06-24
DA7009 - 11 2026-06-24
DA7010 - 10 2026-06-24
DA7017 - 6 2026-06-24
DA7016 - 4 2026-06-19
B55571 - 4 2026-06-26
DA7023 - 2 2026-06-14
DA7001 - 2 2026-06-19
DA7025 - 1 2026-06-12
DA7024 - 1 2026-06-14
DA7020 - 1 2026-06-22
DA7019 - 1 2026-06-22
DA7006 - 1 2026-06-19
DA7005 - 1 2026-06-19
DA7002 - 1 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-26 B55571 - Jun 26, 23:55 UTCJun 27, 00:14 UTC20m
2026-06-24 DA7012 - Jun 24, 08:09 UTCJun 24, 08:45 UTC35m
2026-06-24 DA7017 - Jun 24, 07:24 UTCJun 24, 07:34 UTC10m
2026-06-24 DA7011 - Jun 24, 05:15 UTCJun 24, 05:44 UTC30m
2026-06-24 DA7010 - Jun 24, 03:55 UTCJun 24, 04:15 UTC20m
2026-06-24 DA7009 - Jun 24, 02:40 UTCJun 24, 03:10 UTC30m
2026-06-23 DA7012 - Jun 23, 08:25 UTCJun 23, 08:50 UTC25m
2026-06-23 DA7017 - Jun 23, 07:25 UTCJun 23, 07:35 UTC10m
2026-06-23 DA7011 - Jun 23, 05:29 UTCJun 23, 05:54 UTC25m
2026-06-23 DA7010 - Jun 23, 03:49 UTCJun 23, 04:19 UTC30m
2026-06-23 DA7009 - Jun 23, 02:40 UTCJun 23, 03:09 UTC30m
2026-06-22 DA7012 - Jun 22, 08:15 UTCJun 22, 08:44 UTC30m
2026-06-22 DA7017 - Jun 22, 07:30 UTCJun 22, 07:40 UTC10m
2026-06-22 DA7011 - Jun 22, 05:24 UTCJun 22, 05:49 UTC25m
2026-06-22 DA7010 - Jun 22, 03:50 UTCJun 22, 04:15 UTC25m
2026-06-22 DA7009 - Jun 22, 02:40 UTCJun 22, 03:05 UTC25m
2026-06-22 DA7020 - Jun 22, 01:25 UTCJun 22, 01:40 UTC15m
2026-06-22 DA7019 - Jun 22, 00:10 UTCJun 22, 00:40 UTC30m
2026-06-21 DA7012 - Jun 21, 08:35 UTCJun 21, 09:04 UTC30m
2026-06-21 DA7011 - Jun 21, 06:04 UTCJun 21, 07:09 UTC1h 5m
2026-06-21 DA7009 KHH → KHH Jun 21, 02:45 UTCJun 21, 03:59 UTC1h 15m
2026-06-20 B55571 - Jun 20, 08:09 UTCJun 20, 08:39 UTC30m
2026-06-20 DA7017 - Jun 20, 07:14 UTCJun 20, 07:24 UTC10m
2026-06-20 DA7009 KHH → KHH Jun 20, 02:44 UTCJun 20, 04:09 UTC1h 25m
2026-06-19 DA7012 - Jun 19, 08:09 UTCJun 19, 08:29 UTC20m
2026-06-19 DA7016 - Jun 19, 06:29 UTCJun 19, 06:39 UTC10m
2026-06-19 DA7011 - Jun 19, 05:24 UTCJun 19, 05:54 UTC30m
2026-06-19 DA7006 - Jun 19, 03:29 UTCJun 19, 03:55 UTC25m
2026-06-19 DA7005 - Jun 19, 02:24 UTCJun 19, 02:50 UTC25m
2026-06-19 DA7002 - Jun 19, 01:15 UTCJun 19, 01:39 UTC25m
2026-06-19 DA7001 - Jun 19, 00:05 UTCJun 19, 00:34 UTC29m
2026-06-18 B55571 - Jun 18, 08:10 UTCJun 18, 08:35 UTC25m
2026-06-18 DA7016 - Jun 18, 06:20 UTCJun 18, 06:30 UTC10m
2026-06-18 DA7011 - Jun 18, 05:20 UTCJun 18, 05:45 UTC25m
2026-06-18 DA7010 - Jun 18, 03:55 UTCJun 18, 04:20 UTC25m
2026-06-18 DA7009 - Jun 18, 02:50 UTCJun 18, 03:20 UTC30m
2026-06-17 DA7010 - Jun 17, 03:50 UTCJun 17, 04:20 UTC30m
2026-06-17 DA7009 - Jun 17, 02:40 UTCJun 17, 03:15 UTC35m
2026-06-14 DA7024 - Jun 14, 02:15 UTCJun 14, 02:45 UTC30m
2026-06-14 DA7023 - Jun 14, 01:05 UTCJun 14, 01:35 UTC30m
2026-06-13 DA7012 - Jun 13, 08:00 UTCJun 13, 08:30 UTC30m
2026-06-13 DA7011 - Jun 13, 05:25 UTCJun 13, 05:50 UTC25m
2026-06-13 DA7010 - Jun 13, 03:40 UTCJun 13, 04:05 UTC25m
2026-06-13 DA7009 - Jun 13, 02:45 UTCJun 13, 03:10 UTC25m
2026-06-12 DA7025 KHH → KHH Jun 12, 03:25 UTCJun 12, 04:50 UTC1h 25m
2026-06-12 DA7023 KHH → KHH Jun 12, 01:10 UTCJun 12, 02:35 UTC1h 25m
2026-06-11 DA7012 - Jun 11, 08:05 UTCJun 11, 08:40 UTC35m
2026-06-11 DA7011 - Jun 11, 05:20 UTCJun 11, 05:45 UTC25m
2026-06-11 DA7010 - Jun 11, 03:45 UTCJun 11, 04:10 UTC25m
2026-06-11 DA7009 - Jun 11, 02:40 UTCJun 11, 03:10 UTC30m

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-55571 page for operator, model, and routing details .

Mode-S 8990C3 frequently asked

What is Mode-S code 8990C3?
8990C3 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-55571.
Where is Mode-S 8990C3 registered?
Mode-S code 8990C3 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990C3 broadcasting right now?
No active broadcast right now. Last signal was 24d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990C3, octal 42310303, decimal 9,015,491.
What flights does 8990C3 operate?
Mode-S 8990C3 has broadcast 16 distinct callsigns, including DA7011, DA7012, DA7009, DA7010, DA7017.