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 21h ago
Flights observed
172
Distinct callsigns
20
Country
TW
Last broadcast
21h 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 21 2026-06-10
CAL116 China Airlines 11 2026-06-10
CAL791 China Airlines 9 2026-06-09
CAL836 China Airlines 7 2026-06-13
CAL835 China Airlines 7 2026-06-13
CAL161 China Airlines 7 2026-06-08
CAL160 China Airlines 7 2026-06-08
CAL173 China Airlines 6 2026-05-25
CAL163 China Airlines 6 2026-06-08
CAL162 China Airlines 5 2026-06-08
CAL121 China Airlines 5 2026-05-29
CAL120 China Airlines 5 2026-06-12
CAL111 China Airlines 5 2026-06-06
CAL792 China Airlines 4 2026-06-09
CAL704 China Airlines 4 2026-06-06
CAL703 China Airlines 4 2026-06-06
CAL702 China Airlines 4 2026-05-25
CAL701 China Airlines 4 2026-05-24
CAL527 China Airlines 4 2026-06-11
CAL528 China Airlines 3 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-14 CAL131 - Jun 14, 10:15 UTCJun 14, 10:50 UTC35m
2026-06-14 CAL131 - Jun 14, 06:40 UTCJun 14, 09:00 UTC2h 20m
2026-06-14 CAL130 - Jun 14, 01:20 UTCJun 14, 04:25 UTC3h 5m
2026-06-13 CAL836 BKK → TPE Jun 13, 10:50 UTCJun 13, 14:05 UTC3h 15m
2026-06-13 CAL835 TPE → BKK Jun 13, 05:50 UTCJun 13, 08:55 UTC3h 5m
2026-06-13 CAL602 HKG → TPE Jun 13, 03:05 UTCJun 13, 04:30 UTC1h 24m
2026-06-13 CAL601 TPE → HKG Jun 13, 00:45 UTCJun 13, 00:55 UTC10m
2026-06-12 CAL601 TPE → HKG Jun 12, 23:35 UTCJun 13, 00:05 UTC30m
2026-06-12 CAL836 BKK → TPE Jun 12, 11:00 UTCJun 12, 14:25 UTC3h 25m
2026-06-12 CAL835 TPE → BKK Jun 12, 06:00 UTCJun 12, 09:10 UTC3h 10m
2026-06-12 CAL120 TPE → OKA Jun 12, 00:25 UTCJun 12, 04:10 UTC3h 46m
2026-06-11 CAL528 SZX → TPE Jun 11, 11:25 UTCJun 11, 12:00 UTC35m
2026-06-11 CAL528 SZX → TPE Jun 11, 10:40 UTCJun 11, 10:50 UTC10m
2026-06-11 CAL527 TPE → SZX Jun 11, 08:40 UTCJun 11, 09:00 UTC20m
2026-06-11 CAL527 TPE → SZX Jun 11, 07:40 UTCJun 11, 08:05 UTC25m
2026-06-11 MDA992 - Jun 11, 05:25 UTCJun 11, 05:50 UTC25m
2026-06-11 MDA991 - Jun 11, 01:10 UTCJun 11, 01:35 UTC25m
2026-06-10 CAL117 FUK → TPE Jun 10, 13:50 UTCJun 10, 14:25 UTC35m
2026-06-10 CAL117 FUK → TPE Jun 10, 12:10 UTCJun 10, 12:20 UTC10m
2026-06-10 CAL116 TPE → FUK Jun 10, 08:55 UTCJun 10, 09:20 UTC25m
2026-06-10 CAL157 KIX → TPE Jun 10, 06:25 UTCJun 10, 06:50 UTC25m
2026-06-10 CAL157 KIX → TPE Jun 10, 04:25 UTCJun 10, 05:00 UTC35m
2026-06-10 CAL156 TPE → KIX Jun 10, 00:50 UTCJun 10, 03:00 UTC2h 10m
2026-06-09 CAL117 FUK → TPE Jun 9, 14:25 UTCJun 9, 14:55 UTC30m
2026-06-09 CAL117 FUK → TPE Jun 9, 12:50 UTCJun 9, 13:00 UTC10m
2026-06-09 CAL116 TPE → FUK Jun 9, 09:20 UTCJun 9, 09:40 UTC20m
2026-06-09 CAL792 HAN → TPE Jun 9, 06:15 UTCJun 9, 07:40 UTC1h 25m
2026-06-09 CAL791 TPE → HAN Jun 9, 01:05 UTCJun 9, 02:10 UTC1h 5m
2026-06-08 CAL163 ICN → TPE Jun 8, 11:50 UTCJun 8, 14:10 UTC2h 20m
2026-06-08 CAL162 TPE → ICN Jun 8, 07:50 UTCJun 8, 09:45 UTC1h 55m
2026-06-08 CAL161 ICN → TPE Jun 8, 05:55 UTCJun 8, 06:15 UTC20m
2026-06-08 CAL161 ICN → TPE Jun 8, 04:00 UTCJun 8, 04:30 UTC30m
2026-06-08 CAL160 TPE → ICN Jun 8, 00:15 UTCJun 8, 02:15 UTC2h 0m
2026-06-07 CAL836 BKK → TPE Jun 7, 10:40 UTCJun 7, 14:05 UTC3h 25m
2026-06-07 CAL835 TPE → BKK Jun 7, 05:50 UTCJun 7, 09:00 UTC3h 10m
2026-06-06 CAL704 MNL → TPE Jun 6, 09:55 UTCJun 6, 11:30 UTC1h 35m
2026-06-06 CAL703 TPE → MNL Jun 6, 06:30 UTCJun 6, 08:15 UTC1h 45m
2026-06-06 CAL111 FUK → TPE Jun 6, 03:55 UTCJun 6, 04:20 UTC25m
2026-06-06 CAL111 FUK → TPE Jun 6, 02:25 UTCJun 6, 02:45 UTC20m
2026-06-05 CAL110 TPE → FUK Jun 5, 23:05 UTCJun 5, 23:20 UTC15m
2026-06-05 CAL105 NRT → TPE Jun 5, 13:25 UTCJun 5, 13:55 UTC30m
2026-06-05 CAL105 NRT → TPE Jun 5, 10:25 UTCJun 5, 11:45 UTC1h 20m
2026-06-05 CAL104 TPE → NRT Jun 5, 05:35 UTCJun 5, 08:15 UTC2h 40m
2026-06-04 CAL704 MNL → TPE Jun 4, 09:10 UTCJun 4, 10:50 UTC1h 40m
2026-06-04 CAL703 TPE → MNL Jun 4, 05:50 UTCJun 4, 07:40 UTC1h 50m
2026-06-02 CAL109 NRT → TPE Jun 2, 15:10 UTCJun 2, 15:30 UTC20m
2026-06-02 CAL109 NRT → TPE Jun 2, 12:30 UTCJun 2, 13:45 UTC1h 15m
2026-06-02 CAL108 TPE → NRT Jun 2, 07:35 UTCJun 2, 10:35 UTC3h 0m
2026-06-02 CAL111 FUK → TPE Jun 2, 05:30 UTCJun 2, 05:50 UTC20m
2026-06-02 CAL111 FUK → TPE Jun 2, 04:05 UTCJun 2, 04:15 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 21h 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, CAL791, CAL836, CAL835.