Apparatus

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sensors Mode-S transponder

7705C1

ICAO 24-bit transponder address · allocated to Sri Lanka

Currently assigned to 4R-ANA · AIRBUS A-320neo

Hex
7705C1
Octal
35602701
Decimal
7,800,257
Country
LK
Tail
4R-ANA
Type
A20N
No current signal · last broadcast 6h ago
Flights observed
228
Distinct callsigns
20
Country
LK
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 7705C1.

Country allocation

The ICAO 24-bit address 7705C1 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
ALK182 - 27 2026-07-13
ALK884 SriLankan Airlines 26 2026-07-11
ALK181 - 22 2026-07-02
ALK885 - 17 2026-07-11
ALK880 SriLankan Airlines 11 2026-07-07
ALK196 - 10 2026-07-10
ALK195 - 10 2026-07-10
ALK143 SriLankan Airlines 10 2026-07-14
ALK144 - 9 2026-07-14
ALK218 - 6 2026-07-13
ALK881 - 5 2026-07-07
ALK314 - 5 2026-07-06
ALK365 - 4 2026-07-01
ALK364 - 4 2026-06-26
ALK318 SriLankan Airlines 4 2026-06-05
ALK315 - 4 2026-06-22
ALK191 SriLankan Airlines 4 2026-06-01
ALK166 SriLankan Airlines 4 2026-06-13
ALK405 - 3 2026-07-14
ALK404 - 3 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ALK144 - Jul 14, 15:20 UTCJul 14, 17:00 UTC1h 40m
2026-07-14 ALK143 CMB → BOM Jul 14, 12:05 UTCJul 14, 13:50 UTC1h 45m
2026-07-14 ALK405 - Jul 14, 07:30 UTCJul 14, 08:45 UTC1h 15m
2026-07-14 ALK404 - Jul 14, 05:05 UTCJul 14, 05:30 UTC25m
2026-07-13 ALK218 - Jul 13, 19:35 UTCJul 14, 00:00 UTC4h 25m
2026-07-13 ALK182 - Jul 13, 08:10 UTCJul 13, 17:40 UTC9h 30m
2026-07-12 ALK218 - Jul 12, 19:40 UTCJul 13, 06:10 UTC10h 30m
2026-07-12 ALK182 - Jul 12, 07:50 UTCJul 12, 17:30 UTC9h 40m
2026-07-11 ALK885 - Jul 11, 20:00 UTCJul 12, 06:10 UTC10h 10m
2026-07-11 ALK884 CMB → CAN Jul 11, 17:50 UTCJul 11, 18:05 UTC15m
2026-07-11 ALK884 CMB → CAN Jul 11, 15:40 UTCJul 11, 15:55 UTC15m
2026-07-11 ALK319 - Jul 11, 01:00 UTCJul 11, 01:25 UTC25m
2026-07-10 ALK196 - Jul 10, 13:30 UTCJul 10, 23:05 UTC9h 36m
2026-07-10 ALK195 - Jul 10, 01:20 UTCJul 10, 11:50 UTC10h 30m
2026-07-09 ALK196 - Jul 9, 13:35 UTCJul 9, 22:55 UTC9h 20m
2026-07-09 ALK403 - Jul 9, 00:55 UTCJul 9, 12:00 UTC11h 5m
2026-07-08 ALK182 - Jul 8, 08:35 UTCJul 8, 23:05 UTC14h 30m
2026-07-07 ALK881 - Jul 7, 18:45 UTCJul 8, 06:25 UTC11h 40m
2026-07-07 ALK880 CMB → CAN Jul 7, 13:45 UTCJul 7, 14:00 UTC15m
2026-07-07 ALK880 CMB → CAN Jul 7, 11:30 UTCJul 7, 12:00 UTC30m
2026-07-07 ALK138 - Jul 7, 05:00 UTCJul 7, 05:10 UTC10m
2026-07-06 ALK144 - Jul 6, 15:35 UTCJul 6, 17:25 UTC1h 50m
2026-07-06 ALK143 CMB → BOM Jul 6, 13:40 UTCJul 6, 14:10 UTC30m
2026-07-06 ALK143 CMB → BOM Jul 6, 07:25 UTCJul 6, 13:05 UTC5h 40m
2026-07-06 ALK314 - Jul 6, 05:15 UTCJul 6, 05:55 UTC40m
2026-07-05 ALK218 - Jul 5, 19:50 UTCJul 6, 00:00 UTC4h 10m
2026-07-05 ALK217 CMB → DOH Jul 5, 13:40 UTCJul 5, 17:55 UTC4h 15m
2026-07-05 ALK182 - Jul 5, 07:45 UTCJul 5, 08:45 UTC1h 0m
2026-07-04 ALK885 - Jul 4, 20:25 UTCJul 5, 06:15 UTC9h 50m
2026-07-04 ALK885 - Jul 4, 19:40 UTCJul 4, 19:50 UTC10m
2026-07-04 ALK884 CMB → CAN Jul 4, 17:10 UTCJul 4, 17:20 UTC10m
2026-07-04 ALK152 - Jul 4, 02:30 UTCJul 4, 16:30 UTC14h 0m
2026-07-03 ALK151 - Jul 3, 16:15 UTCJul 4, 00:35 UTC8h 20m
2026-07-03 ALK171 CMB → BLR Jul 3, 09:10 UTCJul 3, 15:00 UTC5h 50m
2026-07-02 ALK885 - Jul 2, 21:55 UTCJul 2, 22:25 UTC30m
2026-07-02 ALK884 CMB → CAN Jul 2, 17:30 UTCJul 2, 17:40 UTC10m
2026-07-02 ALK182 - Jul 2, 07:50 UTCJul 2, 16:40 UTC8h 50m
2026-07-02 ALK181 - Jul 2, 04:45 UTCJul 2, 06:20 UTC1h 35m
2026-07-01 ALK365 - Jul 1, 08:35 UTCJul 1, 08:45 UTC10m
2026-06-30 ALK881 CAN → CMB Jun 30, 18:50 UTCJul 1, 07:15 UTC12h 25m
2026-06-30 ALK403 - Jun 30, 01:04 UTCJun 30, 14:00 UTC12h 56m
2026-06-29 ALK402 - Jun 29, 08:54 UTCJun 29, 22:49 UTC13h 55m
2026-06-29 ALK182 - Jun 29, 07:40 UTCJun 29, 08:39 UTC1h 0m
2026-06-28 ALK254 - Jun 28, 19:34 UTCJun 29, 06:14 UTC10h 40m
2026-06-28 ALK253 CMB → DMM Jun 28, 08:09 UTCJun 28, 17:34 UTC9h 25m
2026-06-27 ALK885 - Jun 27, 20:39 UTCJun 28, 06:20 UTC9h 40m
2026-06-27 ALK884 CMB → CAN Jun 27, 07:24 UTCJun 27, 16:39 UTC9h 15m
2026-06-27 ALK314 - Jun 27, 05:15 UTCJun 27, 05:55 UTC40m
2026-06-26 ALK365 - Jun 26, 07:55 UTCJun 26, 08:15 UTC20m
2026-06-26 ALK364 - Jun 26, 06:15 UTCJun 26, 06:29 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-ANA page for operator, model, and routing details .

Mode-S 7705C1 frequently asked

What is Mode-S code 7705C1?
7705C1 is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ANA.
Where is Mode-S 7705C1 registered?
Mode-S code 7705C1 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 7705C1 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7705C1, octal 35602701, decimal 7,800,257.
What flights does 7705C1 operate?
Mode-S 7705C1 has broadcast 20 distinct callsigns, including ALK182, ALK884, ALK181, ALK885, ALK880.