Apparatus

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sensors Mode-S transponder

8990EE

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18776 · BOEING 777-200LR

Hex
8990EE
Octal
42310356
Decimal
9,015,534
Country
TW
Tail
B-18776
Type
B77L
No current signal · last broadcast 18h ago
Flights observed
15
Distinct callsigns
3
Country
TW
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 8990EE.

Country allocation

The ICAO 24-bit address 8990EE 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 3 distinct

Callsign Airline Flights Last seen
CAL5381 China Airlines 9 2026-04-13
CAL5382 - 4 2026-04-13
CAL5837 - 2 2026-04-14

Recent flights last 15

DateFlightRouteTakeoffLandingDuration
2026-04-14 CAL5837 - Apr 14, 08:35 UTCApr 14, 09:05 UTC30m
2026-04-14 CAL5837 - Apr 14, 07:35 UTCApr 14, 07:55 UTC20m
2026-04-13 CAL5381 MIA → TPE Apr 13, 21:25 UTCApr 13, 22:35 UTC1h 10m
2026-04-13 CAL5381 MIA → TPE Apr 13, 16:15 UTCApr 13, 16:35 UTC20m
2026-04-13 CAL5381 MIA → TPE Apr 13, 15:55 UTCApr 13, 16:35 UTC40m
2026-04-13 CAL5381 MIA → TPE Apr 13, 12:20 UTCApr 13, 16:15 UTC3h 55m
2026-04-13 CAL5381 MIA → TPE Apr 13, 12:00 UTCApr 13, 12:15 UTC15m
2026-04-13 CAL5381 MIA → TPE Apr 13, 08:25 UTCApr 13, 09:25 UTC1h 0m
2026-04-13 CAL5381 MIA → TPE Apr 13, 07:55 UTCApr 13, 09:25 UTC1h 30m
2026-04-13 CAL5381 MIA → TPE Apr 13, 04:20 UTCApr 13, 07:55 UTC3h 35m
2026-04-13 CAL5381 MIA → TPE Apr 13, 03:55 UTCApr 13, 04:15 UTC20m
2026-04-13 CAL5382 - Apr 13, 01:15 UTCApr 13, 01:30 UTC15m
2026-04-13 CAL5382 - Apr 13, 00:20 UTCApr 13, 01:10 UTC50m
2026-04-12 CAL5382 - Apr 12, 23:55 UTCApr 13, 01:10 UTC1h 15m
2026-04-12 CAL5382 - Apr 12, 18:20 UTCApr 12, 19:30 UTC1h 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 B-18776 page for operator, model, and routing details .

Mode-S 8990EE frequently asked

What is Mode-S code 8990EE?
8990EE is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18776.
Where is Mode-S 8990EE registered?
Mode-S code 8990EE is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990EE broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990EE, octal 42310356, decimal 9,015,534.
What flights does 8990EE operate?
Mode-S 8990EE has broadcast 3 distinct callsigns, including CAL5381, CAL5382, CAL5837.