Apparatus

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sensors Mode-S transponder

7705C3

ICAO 24-bit transponder address · allocated to Sri Lanka

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

Hex
7705C3
Octal
35602703
Decimal
7,800,259
Country
LK
Tail
4R-ANC
Type
A21N
Broadcasting now · callsign ALK218 · 34,975 ft
Flights observed
310
Distinct callsigns
20
Country
LK
Last broadcast
Jul 26, 20:35 UTC

Current position

7705C3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 7705C3 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
ALK364 SriLankan Airlines 32 2026-07-25
ALK254 SriLankan Airlines 29 2026-07-26
ALK253 SriLankan Airlines 27 2026-07-26
ALK217 SriLankan Airlines 24 2026-07-23
ALK218 SriLankan Airlines 20 2026-07-23
ALK404 SriLankan Airlines 19 2026-07-26
ALK365 SriLankan Airlines 18 2026-07-25
ALK141 SriLankan Airlines 13 2026-07-22
ALK142 SriLankan Airlines 12 2026-07-22
ALK405 SriLankan Airlines 11 2026-07-26
ALK314 SriLankan Airlines 10 2026-07-22
ALK315 - 9 2026-07-23
ALK89L SriLankan Airlines 7 2026-07-24
ALK318 SriLankan Airlines 7 2026-05-19
ALK166 - 7 2026-06-30
ALK90L - 5 2026-07-15
ALK319 SriLankan Airlines 4 2026-05-20
ALK168 - 4 2026-07-08
ALK161 SriLankan Airlines 4 2026-06-02
ALK885 SriLankan Airlines 3 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ALK254 DMM → CMB Jul 26, 19:25 UTCJul 26, 20:35 UTC1h 10m
2026-07-26 ALK253 CMB → DMM Jul 26, 13:15 UTCJul 26, 17:40 UTC4h 25m
2026-07-26 ALK405 BKK → CMB Jul 26, 07:10 UTCJul 26, 08:35 UTC1h 25m
2026-07-26 ALK404 CMB → BKK Jul 26, 05:00 UTCJul 26, 05:30 UTC30m
2026-07-25 ALK365 CGK → CMB Jul 25, 08:30 UTCJul 25, 08:55 UTC25m
2026-07-25 ALK364 CMB → CGK Jul 25, 06:25 UTCJul 25, 06:45 UTC20m
2026-07-25 ALK364 CMB → CGK Jul 25, 05:15 UTCJul 25, 05:50 UTC35m
2026-07-24 ALK254 DMM → CMB Jul 24, 20:05 UTCJul 25, 00:25 UTC4h 20m
2026-07-24 ALK253 - Jul 24, 07:45 UTCJul 24, 18:15 UTC10h 30m
2026-07-24 ALK89L CMB → TRZ Jul 24, 03:25 UTCJul 24, 05:40 UTC2h 15m
2026-07-23 ALK218 DOH → CMB Jul 23, 19:50 UTCJul 24, 00:00 UTC4h 10m
2026-07-23 ALK217 CMB → DOH Jul 23, 13:45 UTCJul 23, 17:55 UTC4h 10m
2026-07-23 ALK315 - Jul 23, 07:15 UTCJul 23, 07:40 UTC25m
2026-07-22 ALK142 BOM → CMB Jul 22, 22:45 UTCJul 23, 05:45 UTC7h 0m
2026-07-22 ALK141 CMB → BOM Jul 22, 10:20 UTCJul 22, 20:40 UTC10h 20m
2026-07-22 ALK314 CMB → KUL Jul 22, 05:15 UTCJul 22, 05:25 UTC10m
2026-07-21 ALK254 DMM → CMB Jul 21, 13:25 UTCJul 22, 00:10 UTC10h 45m
2026-07-21 ALK315 - Jul 21, 07:35 UTCJul 21, 07:55 UTC20m
2026-07-21 ALK314 CMB → KUL Jul 21, 05:15 UTCJul 21, 05:50 UTC35m
2026-07-20 ALK218 - Jul 20, 19:55 UTCJul 21, 00:15 UTC4h 20m
2026-07-20 ALK217 CMB → DOH Jul 20, 14:10 UTCJul 20, 18:05 UTC3h 55m
2026-07-20 ALK365 CGK → CMB Jul 20, 08:30 UTCJul 20, 08:50 UTC20m
2026-07-20 ALK364 CMB → CGK Jul 20, 06:40 UTCJul 20, 06:55 UTC15m
2026-07-19 ALK218 - Jul 19, 20:00 UTCJul 20, 00:10 UTC4h 10m
2026-07-19 ALK217 CMB → DOH Jul 19, 14:15 UTCJul 19, 18:10 UTC3h 55m
2026-07-19 ALK365 CGK → CMB Jul 19, 08:40 UTCJul 19, 09:05 UTC25m
2026-07-18 ALK218 - Jul 18, 19:45 UTCJul 19, 07:20 UTC11h 35m
2026-07-18 ALK217 CMB → DOH Jul 18, 14:05 UTCJul 18, 18:05 UTC4h 0m
2026-07-18 ALK365 CGK → CMB Jul 18, 08:25 UTCJul 18, 09:25 UTC1h 0m
2026-07-18 ALK364 - Jul 18, 06:20 UTCJul 18, 06:45 UTC25m
2026-07-18 ALK364 - Jul 18, 05:25 UTCJul 18, 05:50 UTC25m
2026-07-17 ALK217 CMB → DOH Jul 17, 13:55 UTCJul 17, 23:55 UTC10h 0m
2026-07-17 ALK365 - Jul 17, 08:20 UTCJul 17, 08:40 UTC20m
2026-07-17 ALK364 - Jul 17, 06:15 UTCJul 17, 06:35 UTC20m
2026-07-16 ALK218 - Jul 16, 19:45 UTCJul 17, 05:39 UTC9h 55m
2026-07-16 ALK217 CMB → DOH Jul 16, 14:00 UTCJul 16, 17:54 UTC3h 55m
2026-07-16 ALK365 - Jul 16, 08:05 UTCJul 16, 08:30 UTC25m
2026-07-16 ALK364 - Jul 16, 06:15 UTCJul 16, 06:35 UTC20m
2026-07-16 ALK364 - Jul 16, 05:15 UTCJul 16, 05:35 UTC20m
2026-07-15 ALK90L - Jul 15, 09:00 UTCJul 16, 05:35 UTC20h 35m
2026-07-15 ALK89L - Jul 15, 05:35 UTCJul 15, 07:20 UTC1h 45m
2026-07-14 ALK254 - Jul 14, 19:50 UTCJul 15, 00:20 UTC4h 29m
2026-07-14 ALK253 - Jul 14, 13:20 UTCJul 14, 17:45 UTC4h 25m
2026-07-13 ALK26L - Jul 13, 19:35 UTCJul 13, 23:25 UTC3h 50m
2026-07-13 ALK25L - Jul 13, 08:05 UTCJul 13, 17:25 UTC9h 20m
2026-07-13 ALK364 - Jul 13, 06:20 UTCJul 13, 06:35 UTC15m
2026-07-13 ALK364 - Jul 13, 05:10 UTCJul 13, 05:31 UTC20m
2026-07-12 ALK254 - Jul 12, 19:40 UTCJul 13, 00:05 UTC4h 25m
2026-07-12 ALK253 - Jul 12, 07:31 UTCJul 12, 17:35 UTC10h 5m
2026-07-12 ALK404 - Jul 12, 05:05 UTCJul 12, 05:30 UTC25m

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

Mode-S 7705C3 frequently asked

What is Mode-S code 7705C3?
7705C3 is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ANC.
Where is Mode-S 7705C3 registered?
Mode-S code 7705C3 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 7705C3 broadcasting right now?
Yes. Mode-S 7705C3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7705C3, octal 35602703, decimal 7,800,259.
What flights does 7705C3 operate?
Mode-S 7705C3 has broadcast 20 distinct callsigns, including ALK364, ALK254, ALK253, ALK217, ALK218.