Apparatus

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sensors Mode-S transponder

7705C6

ICAO 24-bit transponder address · allocated to Sri Lanka

Currently assigned to 4R-ANF · AIRBUS A-321neo

Hex
7705C6
Octal
35602706
Decimal
7,800,262
Country
LK
Tail
4R-ANF
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
276
Distinct callsigns
20
Country
LK
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 7705C6.

Country allocation

The ICAO 24-bit address 7705C6 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
ALK253 - 35 2026-07-13
ALK254 - 32 2026-07-13
ALK364 - 17 2026-07-09
ALK217 SriLankan Airlines 16 2026-06-30
ALK405 - 14 2026-07-06
ALK142 - 13 2026-07-12
ALK404 - 11 2026-07-06
ALK218 - 11 2026-06-30
ALK141 - 11 2026-07-12
ALK314 - 10 2026-07-14
ALK166 - 8 2026-07-12
ALK365 - 7 2026-07-09
ALK165 - 7 2026-07-12
ALK318 SriLankan Airlines 5 2026-05-24
ALK315 - 5 2026-07-10
ALK89L - 4 2026-07-11
ALK403 SriLankan Airlines 4 2026-06-11
ALK124 SriLankan Airlines 4 2026-05-17
ALK123 SriLankan Airlines 4 2026-05-08
ALK402 SriLankan Airlines 3 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ALK314 - Jul 14, 05:10 UTCJul 14, 05:30 UTC20m
2026-07-13 ALK254 - Jul 13, 19:35 UTCJul 14, 00:10 UTC4h 35m
2026-07-13 ALK253 - Jul 13, 13:15 UTCJul 13, 17:30 UTC4h 15m
2026-07-13 ALK122 - Jul 13, 04:50 UTCJul 13, 05:15 UTC25m
2026-07-12 ALK142 - Jul 12, 22:35 UTCJul 12, 23:35 UTC1h 0m
2026-07-12 ALK142 - Jul 12, 21:50 UTCJul 12, 22:00 UTC10m
2026-07-12 ALK141 - Jul 12, 12:40 UTCJul 12, 20:20 UTC7h 40m
2026-07-12 ALK308 - Jul 12, 09:45 UTCJul 12, 10:45 UTC1h 0m
2026-07-12 ALK166 - Jul 12, 04:50 UTCJul 12, 05:20 UTC30m
2026-07-12 ALK165 - Jul 12, 03:15 UTCJul 12, 03:40 UTC25m
2026-07-11 ALK229 - Jul 11, 07:00 UTCJul 11, 23:15 UTC16h 15m
2026-07-11 ALK89L - Jul 11, 03:50 UTCJul 11, 05:15 UTC1h 25m
2026-07-10 ALK254 - Jul 10, 19:35 UTCJul 11, 00:00 UTC4h 25m
2026-07-10 ALK253 - Jul 10, 13:45 UTCJul 10, 17:55 UTC4h 10m
2026-07-10 ALK315 - Jul 10, 07:25 UTCJul 10, 07:55 UTC30m
2026-07-10 ALK314 - Jul 10, 05:25 UTCJul 10, 06:00 UTC35m
2026-07-09 ALK254 - Jul 9, 20:15 UTCJul 10, 00:35 UTC4h 20m
2026-07-09 ALK253 - Jul 9, 13:55 UTCJul 9, 18:10 UTC4h 15m
2026-07-09 ALK365 - Jul 9, 08:40 UTCJul 9, 09:00 UTC20m
2026-07-09 ALK364 - Jul 9, 05:35 UTCJul 9, 06:00 UTC25m
2026-07-08 ALK142 - Jul 8, 22:30 UTCJul 8, 23:30 UTC1h 0m
2026-07-08 ALK142 - Jul 8, 21:45 UTCJul 8, 21:55 UTC10m
2026-07-08 ALK141 - Jul 8, 12:55 UTCJul 8, 20:20 UTC7h 25m
2026-07-08 ALK308 - Jul 8, 02:15 UTCJul 8, 11:10 UTC8h 55m
2026-07-07 ALK254 - Jul 7, 19:35 UTCJul 8, 00:05 UTC4h 30m
2026-07-07 ALK253 - Jul 7, 02:15 UTCJul 7, 17:40 UTC15h 25m
2026-07-06 ALK101 - Jul 6, 07:35 UTCJul 7, 05:05 UTC21h 30m
2026-07-06 ALK405 - Jul 6, 07:10 UTCJul 7, 05:05 UTC21h 55m
2026-07-06 ALK404 - Jul 6, 05:10 UTCJul 6, 05:40 UTC30m
2026-07-05 ALK254 - Jul 5, 20:20 UTCJul 6, 00:40 UTC4h 20m
2026-07-05 ALK253 - Jul 5, 14:05 UTCJul 5, 18:30 UTC4h 25m
2026-07-05 ALK365 - Jul 5, 08:35 UTCJul 5, 09:00 UTC25m
2026-07-05 ALK364 - Jul 5, 06:35 UTCJul 5, 06:50 UTC15m
2026-07-05 ALK364 - Jul 5, 05:30 UTCJul 5, 06:05 UTC35m
2026-07-04 ALK230 - Jul 4, 20:05 UTCJul 4, 23:30 UTC3h 25m
2026-07-04 ALK230 - Jul 4, 19:00 UTCJul 4, 20:00 UTC1h 0m
2026-07-04 ALK229 - Jul 4, 12:10 UTCJul 4, 16:35 UTC4h 25m
2026-07-04 ALK405 - Jul 4, 07:30 UTCJul 4, 08:55 UTC1h 25m
2026-07-04 ALK404 - Jul 4, 04:55 UTCJul 4, 05:25 UTC30m
2026-07-03 ALK254 - Jul 3, 20:15 UTCJul 4, 00:30 UTC4h 15m
2026-07-03 ALK253 CMB → DMM Jul 3, 14:05 UTCJul 3, 18:25 UTC4h 20m
2026-07-02 ALK254 - Jul 2, 20:20 UTCJul 3, 00:35 UTC4h 15m
2026-07-02 ALK253 CMB → DMM Jul 2, 14:05 UTCJul 2, 18:25 UTC4h 20m
2026-07-02 ALK365 - Jul 2, 08:45 UTCJul 2, 09:10 UTC25m
2026-07-02 ALK364 - Jul 2, 05:35 UTCJul 2, 06:51 UTC1h 16m
2026-07-01 ALK254 - Jul 1, 20:00 UTCJul 2, 00:30 UTC4h 30m
2026-07-01 ALK253 CMB → DMM Jul 1, 13:40 UTCJul 1, 18:05 UTC4h 25m
2026-07-01 ALK315 - Jul 1, 08:25 UTCJul 1, 08:50 UTC25m
2026-07-01 ALK314 - Jul 1, 05:55 UTCJul 1, 06:30 UTC35m
2026-06-30 ALK218 - Jun 30, 19:40 UTCJul 1, 00:00 UTC4h 20m

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

Mode-S 7705C6 frequently asked

What is Mode-S code 7705C6?
7705C6 is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ANF.
Where is Mode-S 7705C6 registered?
Mode-S code 7705C6 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 7705C6 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 7705C6, octal 35602706, decimal 7,800,262.
What flights does 7705C6 operate?
Mode-S 7705C6 has broadcast 20 distinct callsigns, including ALK253, ALK254, ALK364, ALK217, ALK405.