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sensors Mode-S transponder

8991B5

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18307 · AIRBUS A-330-300

Hex
8991B5
Octal
42310665
Decimal
9,015,733
Country
TW
Tail
B-18307
Type
A333
Broadcasting now · callsign CAL792 · 2,925 ft
Flights observed
413
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 14:35 UTC

Current position

8991B5 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8991B5 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
CAL161 China Airlines 23 2026-07-21
CAL117 China Airlines 22 2026-07-26
CAL163 China Airlines 21 2026-07-21
CAL116 China Airlines 21 2026-07-26
CAL162 China Airlines 16 2026-07-21
CAL160 China Airlines 16 2026-07-21
CAL791 China Airlines 14 2026-07-26
CAL111 China Airlines 14 2026-07-25
CAL792 China Airlines 13 2026-07-26
CAL923 - 11 2026-06-28
CAL528 China Airlines 11 2026-07-24
CAL527 China Airlines 11 2026-07-24
CAL835 - 10 2026-07-07
CAL110 China Airlines 10 2026-07-25
CAL836 - 9 2026-07-07
CAL173 China Airlines 9 2026-07-25
CAL702 - 8 2026-07-14
CAL105 China Airlines 8 2026-07-23
CAL701 - 7 2026-07-13
CAL521 - 7 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL117 FUK → TPE Jul 26, 12:50 UTCJul 26, 14:35 UTC1h 45m
2026-07-26 CAL116 TPE → FUK Jul 26, 10:50 UTCJul 26, 11:10 UTC20m
2026-07-26 CAL116 TPE → FUK Jul 26, 09:30 UTCJul 26, 09:55 UTC25m
2026-07-26 CAL792 HAN → TPE Jul 26, 05:15 UTCJul 26, 07:55 UTC2h 41m
2026-07-26 CAL791 TPE → HAN Jul 26, 00:40 UTCJul 26, 01:45 UTC1h 5m
2026-07-25 CAL173 KIX → TPE Jul 25, 12:40 UTCJul 25, 13:00 UTC20m
2026-07-25 CAL173 KIX → TPE Jul 25, 10:50 UTCJul 25, 11:30 UTC40m
2026-07-25 CAL172 TPE → KIX Jul 25, 06:50 UTCJul 25, 09:20 UTC2h 30m
2026-07-25 CAL111 FUK → TPE Jul 25, 04:30 UTCJul 25, 04:45 UTC15m
2026-07-25 CAL111 FUK → TPE Jul 25, 03:00 UTCJul 25, 03:20 UTC20m
2026-07-25 CAL110 TPE → FUK Jul 25, 00:30 UTCJul 25, 00:45 UTC15m
2026-07-24 CAL110 TPE → FUK Jul 24, 23:10 UTCJul 24, 23:25 UTC15m
2026-07-24 CAL528 SZX → TPE Jul 24, 10:50 UTCJul 24, 12:10 UTC1h 20m
2026-07-24 CAL527 TPE → SZX Jul 24, 07:20 UTCJul 24, 08:35 UTC1h 15m
2026-07-24 CAL121 OKA → TPE Jul 24, 04:25 UTCJul 24, 05:00 UTC35m
2026-07-24 CAL120 TPE → OKA Jul 24, 00:55 UTCJul 24, 02:05 UTC1h 10m
2026-07-23 CAL105 NRT → TPE Jul 23, 12:05 UTCJul 23, 12:25 UTC20m
2026-07-23 CAL105 NRT → TPE Jul 23, 09:35 UTCJul 23, 10:55 UTC1h 20m
2026-07-23 CAL104 TPE → NRT Jul 23, 06:20 UTCJul 23, 07:45 UTC1h 25m
2026-07-23 CAL104 TPE → NRT Jul 23, 04:45 UTCJul 23, 05:00 UTC15m
2026-07-21 CAL163 ICN → TPE Jul 21, 13:50 UTCJul 21, 14:15 UTC25m
2026-07-21 CAL163 ICN → TPE Jul 21, 12:10 UTCJul 21, 12:50 UTC40m
2026-07-21 CAL162 TPE → ICN Jul 21, 08:10 UTCJul 21, 10:15 UTC2h 5m
2026-07-21 CAL161 ICN → TPE Jul 21, 04:50 UTCJul 21, 06:50 UTC2h 0m
2026-07-21 CAL160 TPE → ICN Jul 21, 00:35 UTCJul 21, 02:40 UTC2h 5m
2026-07-20 CAL522 - Jul 20, 10:20 UTCJul 20, 11:45 UTC1h 25m
2026-07-20 CAL521 - Jul 20, 06:20 UTCJul 20, 07:45 UTC1h 25m
2026-07-19 CAL552 CTU → TPE Jul 19, 01:05 UTCJul 19, 10:30 UTC9h 25m
2026-07-18 CAL522 - Jul 18, 10:25 UTCJul 18, 11:50 UTC1h 25m
2026-07-18 CAL521 - Jul 18, 06:30 UTCJul 18, 07:45 UTC1h 15m
2026-07-17 CAL704 - Jul 17, 09:45 UTCJul 17, 11:35 UTC1h 50m
2026-07-17 CAL703 TPE → MNL Jul 17, 06:15 UTCJul 17, 08:04 UTC1h 50m
2026-07-17 CAL111 - Jul 17, 04:04 UTCJul 17, 04:44 UTC40m
2026-07-17 CAL111 - Jul 17, 02:45 UTCJul 17, 02:59 UTC15m
2026-07-16 CAL110 - Jul 16, 23:10 UTCJul 17, 00:45 UTC1h 35m
2026-07-16 CAL528 - Jul 16, 13:30 UTCJul 16, 14:29 UTC1h 0m
2026-07-16 CAL527 - Jul 16, 09:45 UTCJul 16, 10:04 UTC20m
2026-07-16 CAL527 - Jul 16, 08:05 UTCJul 16, 08:50 UTC45m
2026-07-16 MDA991 TPE → TPE Jul 16, 01:10 UTCJul 16, 06:10 UTC5h 0m
2026-07-15 CAL153 KIX → TPE Jul 15, 05:35 UTCJul 15, 08:00 UTC2h 25m
2026-07-15 CAL152 - Jul 15, 01:55 UTCJul 15, 03:35 UTC1h 40m
2026-07-15 CAL152 - Jul 15, 01:10 UTCJul 15, 01:20 UTC10m
2026-07-14 CAL129 - Jul 14, 11:55 UTCJul 14, 12:20 UTC25m
2026-07-14 CAL129 - Jul 14, 10:35 UTCJul 14, 10:50 UTC15m
2026-07-14 CAL128 - Jul 14, 08:15 UTCJul 14, 08:30 UTC15m
2026-07-14 CAL128 - Jul 14, 06:55 UTCJul 14, 07:25 UTC30m
2026-07-14 CAL702 - Jul 14, 02:55 UTCJul 14, 04:25 UTC1h 30m
2026-07-13 CAL701 - Jul 13, 23:50 UTCJul 14, 01:30 UTC1h 40m
2026-07-13 CAL528 - Jul 13, 10:35 UTCJul 13, 12:00 UTC1h 25m
2026-07-13 CAL527 - Jul 13, 07:35 UTCJul 13, 08:50 UTC1h 15m

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-18307 page for operator, model, and routing details .

Mode-S 8991B5 frequently asked

What is Mode-S code 8991B5?
8991B5 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18307.
Where is Mode-S 8991B5 registered?
Mode-S code 8991B5 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991B5 broadcasting right now?
Yes. Mode-S 8991B5 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991B5, octal 42310665, decimal 9,015,733.
What flights does 8991B5 operate?
Mode-S 8991B5 has broadcast 20 distinct callsigns, including CAL161, CAL117, CAL163, CAL116, CAL162.