Apparatus

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sensors Mode-S transponder

77044C

ICAO 24-bit transponder address · allocated to Sri Lanka

Currently assigned to 4R-ABL · AIRBUS A-320

Hex
77044C
Octal
35602114
Decimal
7,799,884
Country
LK
Tail
4R-ABL
Type
A320
No current signal · last broadcast 1h ago
Flights observed
191
Distinct callsigns
20
Country
LK
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 77044C.

Country allocation

The ICAO 24-bit address 77044C 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
ALK144 - 18 2026-07-07
ALK143 SriLankan Airlines 14 2026-07-07
ALK403 - 10 2026-07-12
ALK191 - 10 2026-07-13
ALK186 - 10 2026-07-12
ALK402 - 9 2026-07-11
ALK185 - 8 2026-06-23
ALK195 - 7 2026-06-15
ALK404 - 6 2026-07-08
ALK306 SriLankan Airlines 6 2026-05-15
ALK192 - 6 2026-07-14
ALK196 SriLankan Airlines 5 2026-06-15
ALK318 - 4 2026-06-25
ALK308 - 4 2026-07-13
ALK184 SriLankan Airlines 4 2026-06-04
ALK171 SriLankan Airlines 4 2026-06-19
ALK152 - 4 2026-06-27
ALK405 SriLankan Airlines 3 2026-06-05
ALK309 SriLankan Airlines 3 2026-07-10
ALK307 SriLankan Airlines 3 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ALK192 - Jul 14, 00:00 UTCJul 14, 02:15 UTC2h 15m
2026-07-13 ALK191 - Jul 13, 12:30 UTCJul 13, 22:20 UTC9h 50m
2026-07-13 ALK308 - Jul 13, 01:05 UTCJul 13, 10:35 UTC9h 30m
2026-07-12 ALK186 - Jul 12, 13:35 UTCJul 12, 23:10 UTC9h 35m
2026-07-12 ALK403 - Jul 12, 01:00 UTCJul 12, 11:40 UTC10h 40m
2026-07-11 ALK402 - Jul 11, 09:00 UTCJul 11, 23:00 UTC14h 0m
2026-07-11 ALK403 - Jul 11, 01:05 UTCJul 11, 23:00 UTC21h 55m
2026-07-11 ALK403 - Jul 11, 00:55 UTCJul 11, 23:00 UTC22h 5m
2026-07-10 ALK309 SIN → CMB Jul 10, 12:45 UTCJul 10, 23:05 UTC10h 20m
2026-07-09 ALK218 - Jul 9, 19:45 UTCJul 10, 11:10 UTC15h 25m
2026-07-09 ALK217 CMB → DOH Jul 9, 17:25 UTCJul 9, 17:55 UTC30m
2026-07-09 ALK217 CMB → DOH Jul 9, 13:35 UTCJul 9, 14:05 UTC30m
2026-07-09 ALK192 - Jul 9, 00:20 UTCJul 9, 02:35 UTC2h 15m
2026-07-08 ALK191 - Jul 8, 08:35 UTCJul 8, 22:30 UTC13h 55m
2026-07-08 ALK404 - Jul 8, 04:55 UTCJul 8, 05:30 UTC35m
2026-07-07 ALK144 - Jul 7, 16:30 UTCJul 7, 17:30 UTC1h 0m
2026-07-07 ALK144 - Jul 7, 15:45 UTCJul 7, 15:55 UTC10m
2026-07-07 ALK143 CMB → BOM Jul 7, 13:40 UTCJul 7, 14:05 UTC25m
2026-07-07 ALK143 CMB → BOM Jul 7, 07:30 UTCJul 7, 13:10 UTC5h 40m
2026-07-06 ALK314 - Jul 6, 13:20 UTCJul 7, 05:50 UTC16h 30m
2026-07-06 ALK403 - Jul 6, 01:00 UTCJul 6, 16:00 UTC15h 0m
2026-07-05 ALK402 - Jul 5, 23:10 UTCJul 5, 23:35 UTC25m
2026-06-27 ALK152 - Jun 27, 02:35 UTCJun 27, 05:04 UTC2h 30m
2026-06-26 ALK151 - Jun 26, 21:55 UTCJun 27, 00:14 UTC2h 20m
2026-06-26 ALK151 - Jun 26, 01:15 UTCJun 27, 00:14 UTC23h 0m
2026-06-25 ALK318 - Jun 25, 07:09 UTCJun 25, 23:19 UTC16h 10m
2026-06-25 ALK404 - Jun 25, 05:05 UTCJun 25, 05:39 UTC35m
2026-06-23 ALK186 LHE → CMB Jun 23, 13:34 UTCJun 23, 16:20 UTC2h 45m
2026-06-23 ALK185 - Jun 23, 01:00 UTCJun 23, 11:49 UTC10h 50m
2026-06-22 ALK402 - Jun 22, 05:04 UTCJun 22, 23:10 UTC18h 5m
2026-06-22 ALK402 - Jun 22, 02:30 UTCJun 22, 23:10 UTC20h 40m
2026-06-21 ALK186 LHE → CMB Jun 21, 13:44 UTCJun 22, 05:20 UTC15h 35m
2026-06-21 ALK185 - Jun 21, 00:49 UTCJun 21, 11:40 UTC10h 50m
2026-06-20 ALK402 - Jun 20, 07:19 UTCJun 20, 23:04 UTC15h 45m
2026-06-20 ALK404 - Jun 20, 05:14 UTCJun 20, 05:39 UTC25m
2026-06-19 ALK172 BLR → CMB Jun 19, 16:29 UTCJun 19, 16:44 UTC15m
2026-06-19 ALK171 CMB → BLR Jun 19, 14:44 UTCJun 19, 14:54 UTC10m
2026-06-19 ALK192D DEL → CMB Jun 19, 04:19 UTCJun 19, 11:45 UTC7h 25m
2026-06-18 ALK191 - Jun 18, 07:25 UTCJun 19, 02:45 UTC19h 19m
2026-06-18 ALK314 - Jun 18, 05:15 UTCJun 18, 05:55 UTC40m
2026-06-17 ALK142 - Jun 17, 22:30 UTCJun 17, 23:30 UTC1h 0m
2026-06-17 ALK142 - Jun 17, 21:45 UTCJun 17, 22:00 UTC15m
2026-06-17 ALK141 CMB → BOM Jun 17, 20:10 UTCJun 17, 20:20 UTC10m
2026-06-17 ALK141 CMB → BOM Jun 17, 18:45 UTCJun 17, 19:30 UTC45m
2026-06-16 ALK315 KUL → CMB Jun 16, 07:30 UTCJun 16, 07:50 UTC20m
2026-06-15 ALK196 DEL → CMB Jun 15, 13:54 UTCJun 16, 05:55 UTC16h 0m
2026-06-15 ALK195 - Jun 15, 01:00 UTCJun 15, 12:05 UTC11h 5m
2026-06-14 ALK318 CMB → KUL Jun 14, 16:15 UTCJun 14, 23:20 UTC7h 4m
2026-06-14 ALK171 CMB → BLR Jun 14, 10:30 UTCJun 14, 15:00 UTC4h 30m
2026-06-14 ALK403 BKK → CMB Jun 14, 00:55 UTCJun 14, 01:10 UTC15m

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

Mode-S 77044C frequently asked

What is Mode-S code 77044C?
77044C is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ABL.
Where is Mode-S 77044C registered?
Mode-S code 77044C 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 77044C broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 77044C, octal 35602114, decimal 7,799,884.
What flights does 77044C operate?
Mode-S 77044C has broadcast 20 distinct callsigns, including ALK144, ALK143, ALK403, ALK191, ALK186.