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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
Broadcasting now · callsign ALK405 · 31,975 ft
Flights observed
327
Distinct callsigns
20
Country
LK
Last broadcast
Jul 26, 20:40 UTC

Current position

7705C6 is currently broadcasting. Map zoomed to live position.

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 - 45 2026-07-25
ALK254 SriLankan Airlines 39 2026-07-25
ALK364 SriLankan Airlines 20 2026-07-26
ALK217 SriLankan Airlines 19 2026-07-26
ALK405 SriLankan Airlines 16 2026-07-25
ALK404 SriLankan Airlines 14 2026-07-25
ALK218 SriLankan Airlines 13 2026-07-26
ALK142 - 13 2026-07-12
ALK314 SriLankan Airlines 12 2026-07-19
ALK141 - 11 2026-07-12
ALK365 SriLankan Airlines 9 2026-07-26
ALK166 SriLankan Airlines 9 2026-07-21
ALK315 - 8 2026-07-19
ALK165 SriLankan Airlines 8 2026-07-21
ALK318 SriLankan Airlines 5 2026-05-24
ALK229 - 5 2026-07-18
ALK89L - 4 2026-07-11
ALK403 SriLankan Airlines 4 2026-06-11
ALK230 - 4 2026-07-18
ALK124 SriLankan Airlines 4 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ALK218 DOH → CMB Jul 26, 20:20 UTCJul 26, 20:40 UTC20m
2026-07-26 ALK217 CMB → DOH Jul 26, 13:50 UTCJul 26, 17:50 UTC4h 0m
2026-07-26 ALK365 CGK → CMB Jul 26, 08:20 UTCJul 26, 08:35 UTC15m
2026-07-26 ALK364 CMB → CGK Jul 26, 05:25 UTCJul 26, 06:45 UTC1h 21m
2026-07-25 ALK254 DMM → CMB Jul 25, 19:30 UTCJul 25, 23:55 UTC4h 25m
2026-07-25 ALK253 - Jul 25, 17:25 UTCJul 25, 17:40 UTC15m
2026-07-25 ALK253 - Jul 25, 13:35 UTCJul 25, 14:15 UTC40m
2026-07-25 ALK405 BKK → CMB Jul 25, 07:25 UTCJul 25, 08:40 UTC1h 15m
2026-07-25 ALK404 CMB → BKK Jul 25, 05:00 UTCJul 25, 05:30 UTC30m
2026-07-24 ALK172 - Jul 24, 16:25 UTCJul 24, 17:15 UTC50m
2026-07-24 ALK365 CGK → CMB Jul 24, 08:45 UTCJul 24, 15:10 UTC6h 25m
2026-07-24 ALK364 CMB → CGK Jul 24, 06:35 UTCJul 24, 06:55 UTC20m
2026-07-24 ALK364 CMB → CGK Jul 24, 05:30 UTCJul 24, 05:50 UTC20m
2026-07-23 ALK254 DMM → CMB Jul 23, 19:40 UTCJul 24, 00:05 UTC4h 25m
2026-07-23 ALK253 - Jul 23, 13:30 UTCJul 23, 17:50 UTC4h 20m
2026-07-23 ALK162 - Jul 23, 04:45 UTCJul 23, 05:10 UTC25m
2026-07-23 ALK161 CMB → TRV Jul 23, 03:05 UTCJul 23, 03:30 UTC25m
2026-07-22 ALK254 DMM → CMB Jul 22, 19:45 UTCJul 23, 00:05 UTC4h 20m
2026-07-22 ALK253 - Jul 22, 17:40 UTCJul 22, 17:50 UTC10m
2026-07-22 ALK253 - Jul 22, 13:35 UTCJul 22, 14:00 UTC25m
2026-07-22 ALK404 CMB → BKK Jul 22, 05:15 UTCJul 22, 05:25 UTC10m
2026-07-21 ALK218 DOH → CMB Jul 21, 22:25 UTCJul 22, 00:15 UTC1h 50m
2026-07-21 ALK217 CMB → DOH Jul 21, 17:30 UTCJul 21, 17:40 UTC10m
2026-07-21 ALK217 CMB → DOH Jul 21, 13:30 UTCJul 21, 14:05 UTC35m
2026-07-21 ALK166 COK → CMB Jul 21, 05:15 UTCJul 21, 05:50 UTC35m
2026-07-21 ALK165 CMB → COK Jul 21, 03:15 UTCJul 21, 03:55 UTC40m
2026-07-20 ALK254 DMM → CMB Jul 20, 19:40 UTCJul 21, 00:10 UTC4h 29m
2026-07-20 ALK253 - Jul 20, 13:35 UTCJul 20, 18:05 UTC4h 30m
2026-07-20 ALK128 - Jul 20, 10:35 UTCJul 20, 10:45 UTC10m
2026-07-20 ALK127 CMB → MAA Jul 20, 09:05 UTCJul 20, 09:20 UTC15m
2026-07-20 ALK122 MAA → CMB Jul 20, 04:40 UTCJul 20, 05:05 UTC25m
2026-07-20 ALK121 CMB → MAA Jul 20, 03:10 UTCJul 20, 03:25 UTC15m
2026-07-19 ALK254 DMM → CMB Jul 19, 19:35 UTCJul 20, 00:05 UTC4h 30m
2026-07-19 ALK253 - Jul 19, 13:50 UTCJul 19, 18:00 UTC4h 10m
2026-07-19 ALK315 - Jul 19, 08:00 UTCJul 19, 08:25 UTC25m
2026-07-19 ALK314 CMB → KUL Jul 19, 05:35 UTCJul 19, 06:15 UTC40m
2026-07-18 ALK230 - Jul 18, 19:10 UTCJul 18, 23:50 UTC4h 40m
2026-07-18 ALK229 - Jul 18, 12:20 UTCJul 18, 16:45 UTC4h 25m
2026-07-18 ALK405 - Jul 18, 07:15 UTCJul 18, 07:30 UTC15m
2026-07-18 ALK404 - Jul 18, 04:55 UTCJul 18, 05:25 UTC30m
2026-07-17 ALK254 DMM → CMB Jul 17, 19:25 UTCJul 18, 00:10 UTC4h 45m
2026-07-17 ALK253 - Jul 17, 17:35 UTCJul 17, 17:55 UTC20m
2026-07-17 ALK253 - Jul 17, 13:25 UTCJul 17, 13:55 UTC30m
2026-07-16 ALK230 - Jul 16, 18:59 UTCJul 17, 11:30 UTC16h 30m
2026-07-16 ALK229 - Jul 16, 04:45 UTCJul 16, 16:44 UTC12h 0m
2026-07-15 ALK254 - Jul 15, 19:25 UTCJul 16, 03:20 UTC7h 55m
2026-07-15 ALK253 - Jul 15, 13:30 UTCJul 15, 17:50 UTC4h 20m
2026-07-15 ALK315 - Jul 15, 08:25 UTCJul 15, 08:55 UTC30m
2026-07-15 ALK314 - Jul 15, 05:35 UTCJul 15, 06:05 UTC30m
2026-07-14 ALK229 - Jul 14, 12:05 UTCJul 15, 01:20 UTC13h 14m

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?
Yes. Mode-S 7705C6 is currently airborne.
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.