Apparatus

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sensors Mode-S transponder

8991B6

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18308 · AIRBUS A-330-300

Hex
8991B6
Octal
42310666
Decimal
9,015,734
Country
TW
Tail
B-18308
Type
A333
No current signal · last broadcast Jul 26, 09:10 UTC
Flights observed
306
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 09:10 UTC

Last known position

Most recent position reported by Mode-S 8991B6.

Country allocation

The ICAO 24-bit address 8991B6 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 20 distinct

Callsign Airline Flights Last seen
CAL792 China Airlines 20 2026-07-25
CAL161 China Airlines 17 2026-07-22
CAL131 - 17 2026-07-05
CAL791 China Airlines 16 2026-07-25
CAL836 China Airlines 13 2026-07-24
CAL835 China Airlines 12 2026-07-24
CAL163 China Airlines 12 2026-07-22
CAL160 China Airlines 12 2026-07-22
CAL130 - 11 2026-07-05
CAL117 - 11 2026-07-21
CAL162 China Airlines 8 2026-07-19
CAL151 China Airlines 8 2026-05-01
CAL116 China Airlines 8 2026-07-21
MDA991 - 7 2026-07-26
CAL919 - 7 2026-07-16
MDA992 - 6 2026-07-26
CAL521 China Airlines 6 2026-07-23
CAL120 - 6 2026-07-03
CAL111 China Airlines 6 2026-07-24
CAL920 - 5 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 MDA992 - Jul 26, 07:55 UTCJul 26, 09:10 UTC1h 15m
2026-07-26 MDA991 - Jul 26, 04:50 UTCJul 26, 05:40 UTC50m
2026-07-25 CAL792 HAN → TPE Jul 25, 05:20 UTCJul 25, 07:40 UTC2h 20m
2026-07-25 CAL791 TPE → HAN Jul 25, 01:10 UTCJul 25, 02:25 UTC1h 15m
2026-07-24 CAL836 BKK → TPE Jul 24, 11:35 UTCJul 24, 15:20 UTC3h 45m
2026-07-24 CAL835 TPE → BKK Jul 24, 06:30 UTCJul 24, 10:00 UTC3h 30m
2026-07-24 CAL111 FUK → TPE Jul 24, 02:50 UTCJul 24, 04:55 UTC2h 5m
2026-07-24 CAL110 TPE → FUK Jul 24, 00:30 UTCJul 24, 01:00 UTC30m
2026-07-23 CAL110 TPE → FUK Jul 23, 23:15 UTCJul 23, 23:35 UTC20m
2026-07-23 CAL522 CAN → TPE Jul 23, 09:55 UTCJul 23, 11:15 UTC1h 20m
2026-07-23 CAL521 TPE → CAN Jul 23, 06:15 UTCJul 23, 07:25 UTC1h 10m
2026-07-23 CAL702 MNL → TPE Jul 23, 02:45 UTCJul 23, 04:30 UTC1h 45m
2026-07-22 CAL701 TPE → MNL Jul 22, 23:35 UTCJul 23, 01:20 UTC1h 45m
2026-07-22 CAL163 ICN → TPE Jul 22, 13:55 UTCJul 22, 14:25 UTC30m
2026-07-22 CAL163 ICN → TPE Jul 22, 12:10 UTCJul 22, 12:50 UTC40m
2026-07-22 CAL161 ICN → TPE Jul 22, 04:25 UTCJul 22, 05:00 UTC35m
2026-07-22 CAL160 TPE → ICN Jul 22, 00:35 UTCJul 22, 02:40 UTC2h 5m
2026-07-21 CAL117 - Jul 21, 14:00 UTCJul 21, 14:30 UTC30m
2026-07-21 CAL117 - Jul 21, 12:25 UTCJul 21, 12:55 UTC30m
2026-07-21 CAL116 TPE → FUK Jul 21, 09:05 UTCJul 21, 10:45 UTC1h 40m
2026-07-21 CAL792 HAN → TPE Jul 21, 06:05 UTCJul 21, 07:35 UTC1h 30m
2026-07-21 CAL792 HAN → TPE Jul 21, 05:05 UTCJul 21, 05:15 UTC10m
2026-07-21 CAL791 TPE → HAN Jul 21, 01:10 UTCJul 21, 02:15 UTC1h 5m
2026-07-20 CAL117 - Jul 20, 13:50 UTCJul 20, 14:15 UTC25m
2026-07-20 CAL117 - Jul 20, 12:25 UTCJul 20, 12:40 UTC15m
2026-07-20 CAL116 TPE → FUK Jul 20, 09:00 UTCJul 20, 10:35 UTC1h 35m
2026-07-20 CAL792 HAN → TPE Jul 20, 06:10 UTCJul 20, 07:35 UTC1h 25m
2026-07-20 CAL792 HAN → TPE Jul 20, 05:10 UTCJul 20, 05:20 UTC10m
2026-07-20 CAL791 TPE → HAN Jul 20, 01:15 UTCJul 20, 02:20 UTC1h 5m
2026-07-19 CAL163 ICN → TPE Jul 19, 11:55 UTCJul 19, 14:05 UTC2h 10m
2026-07-19 CAL162 TPE → ICN Jul 19, 07:45 UTCJul 19, 09:50 UTC2h 5m
2026-07-19 CAL161 ICN → TPE Jul 19, 05:50 UTCJul 19, 06:20 UTC30m
2026-07-19 CAL161 ICN → TPE Jul 19, 04:10 UTCJul 19, 05:00 UTC50m
2026-07-19 CAL160 TPE → ICN Jul 19, 00:25 UTCJul 19, 02:30 UTC2h 5m
2026-07-18 CAL173 - Jul 18, 13:10 UTCJul 18, 13:25 UTC15m
2026-07-18 CAL173 - Jul 18, 11:05 UTCJul 18, 12:35 UTC1h 30m
2026-07-18 CAL172 - Jul 18, 08:50 UTCJul 18, 09:40 UTC50m
2026-07-18 CAL172 - Jul 18, 07:10 UTCJul 18, 07:25 UTC15m
2026-07-18 CAL904 HKG → TPE Jul 18, 03:45 UTCJul 18, 05:20 UTC1h 35m
2026-07-18 CAL903 TPE → HKG Jul 18, 00:29 UTCJul 18, 01:45 UTC1h 15m
2026-07-17 CAL117 - Jul 17, 12:35 UTCJul 17, 14:15 UTC1h 40m
2026-07-17 CAL116 - Jul 17, 09:20 UTCJul 17, 10:55 UTC1h 35m
2026-07-17 CAL792 - Jul 17, 05:15 UTCJul 17, 07:44 UTC2h 30m
2026-07-17 CAL791 TPE → HAN Jul 17, 01:05 UTCJul 17, 02:15 UTC1h 10m
2026-07-16 CAL920 - Jul 16, 12:55 UTCJul 16, 14:35 UTC1h 40m
2026-07-16 CAL919 - Jul 16, 10:04 UTCJul 16, 11:15 UTC1h 10m
2026-07-16 CAL792 - Jul 16, 05:30 UTCJul 16, 07:55 UTC2h 25m
2026-07-16 CAL791 - Jul 16, 01:30 UTCJul 16, 02:40 UTC1h 10m
2026-07-15 CAL163 - Jul 15, 13:35 UTCJul 15, 14:00 UTC25m
2026-07-15 CAL163 - Jul 15, 12:00 UTCJul 15, 12:45 UTC45m

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-18308 page for operator, model, and routing details .

Mode-S 8991B6 frequently asked

What is Mode-S code 8991B6?
8991B6 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18308.
Where is Mode-S 8991B6 registered?
Mode-S code 8991B6 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991B6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 09:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991B6, octal 42310666, decimal 9,015,734.
What flights does 8991B6 operate?
Mode-S 8991B6 has broadcast 20 distinct callsigns, including CAL792, CAL161, CAL131, CAL791, CAL836.