Apparatus

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sensors Mode-S transponder

8991B7

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18309 · AIRBUS A-330-300

Hex
8991B7
Octal
42310667
Decimal
9,015,735
Country
TW
Tail
B-18309
Type
A333
No current signal · last broadcast 3d ago
Flights observed
328
Distinct callsigns
20
Country
TW
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 8991B7.

Country allocation

The ICAO 24-bit address 8991B7 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
CAL117 China Airlines 36 2026-07-24
CAL116 China Airlines 28 2026-07-24
CAL792 China Airlines 27 2026-07-24
CAL791 China Airlines 26 2026-07-24
CAL835 China Airlines 10 2026-07-21
CAL836 China Airlines 9 2026-07-21
CAL111 - 9 2026-07-18
CAL702 - 8 2026-07-16
CAL701 - 8 2026-07-16
CAL173 - 8 2026-06-28
CAL161 China Airlines 8 2026-07-20
CAL160 China Airlines 8 2026-07-20
CAL163 - 7 2026-07-20
CAL120 - 7 2026-07-21
CAL704 - 6 2026-07-18
CAL703 - 6 2026-07-18
CAL527 - 6 2026-06-18
CAL162 China Airlines 6 2026-07-20
CAL121 China Airlines 6 2026-07-21
MDA992 - 5 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL924 HKG → TPE Jul 26, 15:15 UTCJul 26, 16:35 UTC1h 20m
2026-07-26 CAL923 TPE → HKG Jul 26, 12:40 UTCJul 26, 12:50 UTC10m
2026-07-26 CAL923 TPE → HKG Jul 26, 11:25 UTCJul 26, 12:10 UTC45m
2026-07-26 CAL552 CTU → TPE Jul 26, 00:35 UTCJul 26, 08:45 UTC8h 11m
2026-07-25 CAL105 NRT → TPE Jul 25, 12:05 UTCJul 25, 12:20 UTC15m
2026-07-25 CAL105 NRT → TPE Jul 25, 09:25 UTCJul 25, 10:40 UTC1h 15m
2026-07-25 CAL104 TPE → NRT Jul 25, 04:35 UTCJul 25, 07:30 UTC2h 55m
2026-07-24 CAL117 FUK → TPE Jul 24, 14:20 UTCJul 24, 14:55 UTC35m
2026-07-24 CAL117 FUK → TPE Jul 24, 12:30 UTCJul 24, 12:40 UTC10m
2026-07-24 CAL116 TPE → FUK Jul 24, 09:15 UTCJul 24, 10:45 UTC1h 30m
2026-07-24 CAL792 HAN → TPE Jul 24, 05:20 UTCJul 24, 07:30 UTC2h 10m
2026-07-24 CAL791 TPE → HAN Jul 24, 01:00 UTCJul 24, 02:15 UTC1h 15m
2026-07-23 CAL792 HAN → TPE Jul 23, 06:45 UTCJul 23, 08:10 UTC1h 25m
2026-07-23 CAL792 HAN → TPE Jul 23, 05:50 UTCJul 23, 06:05 UTC15m
2026-07-23 CAL791 TPE → HAN Jul 23, 01:45 UTCJul 23, 02:55 UTC1h 10m
2026-07-22 CAL834 BKK → TPE Jul 22, 04:10 UTCJul 22, 04:40 UTC30m
2026-07-21 CAL833 - Jul 21, 23:25 UTCJul 22, 02:30 UTC3h 5m
2026-07-21 CAL836 BKK → TPE Jul 21, 10:55 UTCJul 21, 14:20 UTC3h 25m
2026-07-21 CAL835 TPE → BKK Jul 21, 08:35 UTCJul 21, 09:20 UTC45m
2026-07-21 CAL835 TPE → BKK Jul 21, 06:00 UTCJul 21, 06:55 UTC55m
2026-07-21 CAL121 OKA → TPE Jul 21, 04:00 UTCJul 21, 04:20 UTC20m
2026-07-21 CAL120 - Jul 21, 01:25 UTCJul 21, 01:40 UTC15m
2026-07-21 CAL120 - Jul 21, 00:25 UTCJul 21, 00:50 UTC25m
2026-07-20 CAL163 ICN → TPE Jul 20, 11:45 UTCJul 20, 13:45 UTC2h 0m
2026-07-20 CAL162 TPE → ICN Jul 20, 07:45 UTCJul 20, 09:50 UTC2h 5m
2026-07-20 CAL161 ICN → TPE Jul 20, 04:10 UTCJul 20, 06:10 UTC2h 0m
2026-07-20 CAL160 TPE → ICN Jul 20, 00:15 UTCJul 20, 02:25 UTC2h 10m
2026-07-19 CAL920 HKG → TPE Jul 19, 13:05 UTCJul 19, 14:30 UTC1h 25m
2026-07-19 CAL919 TPE → HKG Jul 19, 09:55 UTCJul 19, 11:25 UTC1h 30m
2026-07-19 CAL792 HAN → TPE Jul 19, 06:00 UTCJul 19, 08:25 UTC2h 25m
2026-07-19 CAL791 TPE → HAN Jul 19, 01:00 UTCJul 19, 02:10 UTC1h 10m
2026-07-18 CAL704 - Jul 18, 09:55 UTCJul 18, 11:40 UTC1h 45m
2026-07-18 CAL703 - Jul 18, 06:15 UTCJul 18, 08:05 UTC1h 50m
2026-07-18 CAL111 - Jul 18, 04:15 UTCJul 18, 04:35 UTC20m
2026-07-18 CAL111 - Jul 18, 02:50 UTCJul 18, 03:10 UTC20m
2026-07-17 CAL110 - Jul 17, 23:14 UTCJul 18, 00:50 UTC1h 35m
2026-07-16 CAL522 - Jul 16, 09:50 UTCJul 16, 11:30 UTC1h 40m
2026-07-16 CAL521 - Jul 16, 06:25 UTCJul 16, 07:10 UTC45m
2026-07-16 CAL702 - Jul 16, 03:05 UTCJul 16, 04:45 UTC1h 40m
2026-07-16 CAL701 - Jul 16, 00:00 UTCJul 16, 01:40 UTC1h 40m
2026-07-15 CAL117 - Jul 15, 14:00 UTCJul 15, 14:15 UTC15m
2026-07-15 CAL117 - Jul 15, 12:35 UTCJul 15, 12:50 UTC15m
2026-07-15 CAL116 - Jul 15, 10:30 UTCJul 15, 10:50 UTC20m
2026-07-15 CAL116 - Jul 15, 09:15 UTCJul 15, 09:45 UTC30m
2026-07-15 CAL792 - Jul 15, 06:15 UTCJul 15, 07:40 UTC1h 25m
2026-07-15 CAL792 - Jul 15, 05:10 UTCJul 15, 05:20 UTC10m
2026-07-15 CAL791 - Jul 15, 01:15 UTCJul 15, 02:20 UTC1h 5m
2026-07-14 CAL792 - Jul 14, 06:55 UTCJul 14, 08:25 UTC1h 30m
2026-07-14 CAL792 - Jul 14, 06:00 UTCJul 14, 06:10 UTC10m
2026-07-14 CAL791 - Jul 14, 03:55 UTCJul 14, 04:05 UTC10m

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-18309 page for operator, model, and routing details .

Mode-S 8991B7 frequently asked

What is Mode-S code 8991B7?
8991B7 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18309.
Where is Mode-S 8991B7 registered?
Mode-S code 8991B7 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991B7 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991B7, octal 42310667, decimal 9,015,735.
What flights does 8991B7 operate?
Mode-S 8991B7 has broadcast 20 distinct callsigns, including CAL117, CAL116, CAL792, CAL791, CAL835.