Apparatus

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sensors Mode-S transponder

770591

ICAO 24-bit transponder address · allocated to Sri Lanka

Currently assigned to 4R-ALQ · AIRBUS A-330-300

Hex
770591
Octal
35602621
Decimal
7,800,209
Country
LK
Tail
4R-ALQ
Type
A333
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
220
Distinct callsigns
20
Country
LK
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S 770591.

Country allocation

The ICAO 24-bit address 770591 falls within the block assigned to Sri Lanka (LK) by ICAO Annex 10, Volume III. Every aircraft registered in Sri Lanka 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
ALK504 SriLankan Airlines 40 2026-07-25
ALK503 SriLankan Airlines 38 2026-07-25
ALK604 SriLankan Airlines 26 2026-07-18
ALK26L SriLankan Airlines 15 2026-07-21
ALK455 - 14 2026-07-04
ALK25L SriLankan Airlines 11 2026-06-21
ALK501 SriLankan Airlines 10 2026-05-17
ALK605 - 9 2026-07-18
ALK454 - 8 2026-07-03
ALK266 - 5 2026-06-16
ALK606 - 4 2026-07-04
ALK564 SriLankan Airlines 4 2026-07-24
ALK563 SriLankan Airlines 4 2026-07-23
ALK90L SriLankan Airlines 3 2026-05-04
ALK600 SriLankan Airlines 3 2026-05-29
ALK141 - 3 2026-07-02
ALK89L SriLankan Airlines 2 2026-05-04
ALK607 - 2 2026-07-05
ALK318 SriLankan Airlines 2 2026-04-14
ALK265 SriLankan Airlines 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ALK470 CMB → ICN Jul 25, 22:20 UTCJul 26, 22:15 UTC23h 56m
2026-07-25 ALK504 LHR → CMB Jul 25, 21:10 UTCJul 26, 20:15 UTC23h 6m
2026-07-25 ALK503 CMB → LHR Jul 25, 08:25 UTCJul 25, 19:05 UTC10h 40m
2026-07-24 ALK564 CDG → CMB Jul 24, 13:30 UTCJul 25, 05:25 UTC15h 55m
2026-07-23 ALK563 CMB → CDG Jul 23, 20:40 UTCJul 24, 07:10 UTC10h 30m
2026-07-22 ALK504 LHR → CMB Jul 22, 22:20 UTCJul 23, 17:25 UTC19h 5m
2026-07-22 ALK504 LHR → CMB Jul 22, 21:45 UTCJul 23, 17:25 UTC19h 40m
2026-07-22 ALK503 CMB → LHR Jul 22, 14:40 UTCJul 22, 19:35 UTC4h 55m
2026-07-22 ALK503 CMB → LHR Jul 22, 12:05 UTCJul 22, 12:15 UTC10m
2026-07-21 ALK26L DXB → CMB Jul 21, 13:45 UTCJul 21, 23:30 UTC9h 45m
2026-07-21 ALK504 LHR → CMB Jul 21, 05:50 UTCJul 21, 06:45 UTC55m
2026-07-20 ALK504 LHR → CMB Jul 20, 20:55 UTCJul 21, 05:45 UTC8h 49m
2026-07-20 ALK503 - Jul 20, 11:45 UTCJul 20, 18:45 UTC7h 0m
2026-07-20 ALK503 - Jul 20, 08:00 UTCJul 20, 08:30 UTC30m
2026-07-19 ALK564 CDG → CMB Jul 19, 13:30 UTCJul 20, 05:40 UTC16h 10m
2026-07-19 ALK563 - Jul 19, 06:35 UTCJul 19, 07:35 UTC1h 0m
2026-07-18 ALK563 - Jul 18, 21:10 UTCJul 19, 06:30 UTC9h 20m
2026-07-18 ALK605 - Jul 18, 06:25 UTCJul 18, 07:40 UTC1h 15m
2026-07-18 ALK604 CMB → MEL Jul 18, 03:10 UTCJul 18, 04:30 UTC1h 20m
2026-07-17 ALK604 CMB → MEL Jul 17, 06:35 UTCJul 18, 04:30 UTC21h 56m
2026-07-16 ALK604 CMB → MEL Jul 16, 11:45 UTCJul 17, 04:39 UTC16h 55m
2026-07-16 ALK604 CMB → MEL Jul 16, 09:05 UTCJul 17, 04:39 UTC19h 35m
2026-07-16 ALK604 CMB → MEL Jul 16, 06:20 UTCJul 17, 04:39 UTC22h 20m
2026-07-16 ALK604 CMB → MEL Jul 16, 04:25 UTCJul 17, 04:14 UTC23h 50m
2026-07-15 ALK504 - Jul 15, 21:05 UTCJul 16, 14:25 UTC17h 20m
2026-07-15 ALK503 - Jul 15, 08:00 UTCJul 15, 18:50 UTC10h 50m
2026-07-15 ALK102 - Jul 15, 02:25 UTCJul 15, 05:30 UTC3h 5m
2026-07-14 ALK26L - Jul 14, 19:45 UTCJul 14, 23:35 UTC3h 49m
2026-07-13 ALK504 - Jul 13, 22:20 UTCJul 14, 17:25 UTC19h 5m
2026-07-13 ALK504 - Jul 13, 20:55 UTCJul 14, 17:25 UTC20h 30m
2026-07-13 ALK503 - Jul 13, 02:05 UTCJul 13, 18:55 UTC16h 50m
2026-07-12 ALK503 - Jul 12, 22:30 UTCJul 13, 18:55 UTC20h 25m
2026-07-12 ALK503 - Jul 12, 20:20 UTCJul 13, 18:55 UTC22h 35m
2026-07-12 ALK503 - Jul 12, 20:01 UTCJul 13, 18:15 UTC22h 15m
2026-07-12 ALK503 - Jul 12, 17:01 UTCJul 13, 16:15 UTC23h 15m
2026-07-12 ALK564 - Jul 12, 14:20 UTCJul 13, 14:15 UTC23h 55m
2026-07-12 ALK564 - Jul 12, 13:25 UTCJul 13, 11:55 UTC22h 30m
2026-07-11 ALK563 - Jul 11, 20:35 UTCJul 12, 07:01 UTC10h 25m
2026-07-05 ALK607 - Jul 5, 06:50 UTCJul 5, 13:50 UTC7h 0m
2026-07-04 ALK606 - Jul 4, 10:20 UTCJul 5, 04:50 UTC18h 30m
2026-07-04 ALK455 - Jul 4, 09:25 UTCJul 5, 04:50 UTC19h 25m
2026-07-04 ALK455 - Jul 4, 06:20 UTCJul 5, 04:50 UTC22h 30m
2026-07-04 ALK455 - Jul 4, 04:20 UTCJul 5, 04:15 UTC23h 55m
2026-07-04 ALK455 - Jul 4, 04:10 UTCJul 4, 11:00 UTC6h 50m
2026-07-03 ALK454 - Jul 3, 13:00 UTCJul 4, 02:30 UTC13h 30m
2026-07-03 ALK308 - Jul 3, 05:15 UTCJul 3, 11:35 UTC6h 20m
2026-07-02 ALK142 - Jul 2, 22:35 UTCJul 3, 00:10 UTC1h 35m
2026-07-02 ALK141 - Jul 2, 20:00 UTCJul 2, 20:25 UTC25m
2026-07-02 ALK605 - Jul 2, 06:30 UTCJul 2, 19:30 UTC13h 0m
2026-07-02 ALK604 - Jul 2, 03:20 UTCJul 2, 04:35 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 4R-ALQ page for operator, model, and routing details .

Mode-S 770591 frequently asked

What is Mode-S code 770591?
770591 is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ALQ.
Where is Mode-S 770591 registered?
Mode-S code 770591 is allocated to Sri Lanka (LK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 770591 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 770591, octal 35602621, decimal 7,800,209.
What flights does 770591 operate?
Mode-S 770591 has broadcast 20 distinct callsigns, including ALK504, ALK503, ALK604, ALK26L, ALK455.