Apparatus

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sensors Mode-S transponder

77058D

ICAO 24-bit transponder address · allocated to Sri Lanka

Currently assigned to 4R-ALM · AIRBUS A-330-300

Hex
77058D
Octal
35602615
Decimal
7,800,205
Country
LK
Tail
4R-ALM
Type
A333
No current signal · last broadcast 8h ago
Flights observed
214
Distinct callsigns
20
Country
LK
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 77058D.

Country allocation

The ICAO 24-bit address 77058D 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
ALK604 - 40 2026-07-11
ALK455 - 23 2026-07-07
ALK606 - 22 2026-07-12
ALK454 - 19 2026-07-06
ALK605 - 17 2026-07-11
ALK89L - 9 2026-07-13
ALK26L - 9 2026-06-23
ALK607 - 7 2026-07-10
ALK308 - 7 2026-06-24
ALK90L - 6 2026-07-13
ALK471 SriLankan Airlines 6 2026-06-03
ALK142 - 6 2026-06-18
ALK600 SriLankan Airlines 4 2026-05-31
ALK154 - 4 2026-06-29
ALK558 - 3 2026-07-05
ALK309 SriLankan Airlines 3 2026-05-30
ALK266 SriLankan Airlines 3 2026-04-30
ALK153 - 3 2026-06-24
ALK141 - 3 2026-06-18
ALK121 SriLankan Airlines 3 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ALK90L - Jul 13, 07:50 UTCJul 13, 16:45 UTC8h 55m
2026-07-13 ALK89L - Jul 13, 04:10 UTCJul 13, 05:40 UTC1h 30m
2026-07-12 ALK89L - Jul 12, 06:25 UTCJul 13, 05:15 UTC22h 50m
2026-07-12 ALK606 - Jul 12, 03:01 UTCJul 12, 04:30 UTC1h 30m
2026-07-11 ALK606 - Jul 11, 07:20 UTCJul 12, 04:30 UTC21h 10m
2026-07-11 ALK605 - Jul 11, 06:30 UTCJul 12, 03:15 UTC20h 45m
2026-07-11 ALK604 - Jul 11, 03:25 UTCJul 11, 04:40 UTC1h 15m
2026-07-10 ALK607 - Jul 10, 06:25 UTCJul 10, 07:00 UTC35m
2026-07-10 ALK606 - Jul 10, 00:50 UTCJul 10, 04:40 UTC3h 50m
2026-07-09 ALK606 - Jul 9, 07:20 UTCJul 10, 04:40 UTC21h 20m
2026-07-09 ALK605 MEL → SYD Jul 9, 06:35 UTCJul 10, 04:40 UTC22h 5m
2026-07-09 ALK604 - Jul 9, 01:15 UTCJul 9, 04:40 UTC3h 25m
2026-07-08 ALK604 - Jul 8, 07:20 UTCJul 9, 04:40 UTC21h 20m
2026-07-08 ALK604 MEL → MEL Jul 8, 06:25 UTCJul 9, 04:40 UTC22h 15m
2026-07-07 ALK604 - Jul 7, 09:20 UTCJul 8, 04:40 UTC19h 20m
2026-07-07 ALK455 - Jul 7, 07:55 UTCJul 8, 04:40 UTC20h 45m
2026-07-07 ALK455 - Jul 7, 05:20 UTCJul 8, 04:40 UTC23h 20m
2026-07-07 ALK455 - Jul 7, 02:45 UTCJul 7, 16:50 UTC14h 5m
2026-07-06 ALK454 - Jul 6, 07:55 UTCJul 7, 00:15 UTC16h 20m
2026-07-05 ALK558 - Jul 5, 14:25 UTCJul 6, 05:10 UTC14h 45m
2026-07-04 ALK557 - Jul 4, 19:25 UTCJul 5, 05:35 UTC10h 10m
2026-07-04 ALK605 - Jul 4, 07:00 UTCJul 4, 08:15 UTC1h 15m
2026-07-04 ALK604 - Jul 4, 03:45 UTCJul 4, 05:00 UTC1h 15m
2026-07-03 ALK604 SYD → MEL Jul 3, 06:30 UTCJul 4, 05:00 UTC22h 30m
2026-07-02 ALK606 - Jul 2, 09:20 UTCJul 3, 04:30 UTC19h 10m
2026-07-02 ALK90L DAC → SYD Jul 2, 08:00 UTCJul 3, 04:30 UTC20h 30m
2026-07-01 ALK558 FRA → DAC Jul 1, 14:55 UTCJul 2, 05:20 UTC14h 25m
2026-06-30 ALK557 - Jun 30, 19:40 UTCJul 1, 05:45 UTC10h 5m
2026-06-30 ALK607 SYD → CMB Jun 30, 06:30 UTCJun 30, 13:45 UTC7h 15m
2026-06-30 ALK606 CMB → SYD Jun 30, 03:05 UTCJun 30, 04:40 UTC1h 35m
2026-06-29 ALK154 - Jun 29, 02:30 UTCJun 29, 05:04 UTC2h 35m
2026-06-28 ALK605 - Jun 28, 06:30 UTCJun 29, 00:14 UTC17h 45m
2026-06-28 ALK604 - Jun 28, 03:19 UTCJun 28, 04:35 UTC1h 15m
2026-06-27 ALK604 SYD → MEL Jun 27, 06:25 UTCJun 28, 04:35 UTC22h 10m
2026-06-26 ALK606 CMB → SYD Jun 26, 12:55 UTCJun 27, 04:34 UTC15h 40m
2026-06-26 ALK606 CMB → SYD Jun 26, 07:20 UTCJun 27, 04:34 UTC21h 15m
2026-06-26 ALK605 MEL → SYD Jun 26, 06:35 UTCJun 27, 04:34 UTC22h 0m
2026-06-25 ALK604 - Jun 25, 10:59 UTCJun 26, 04:20 UTC17h 20m
2026-06-25 ALK604 - Jun 25, 03:20 UTCJun 26, 03:15 UTC23h 55m
2026-06-25 ALK154 - Jun 25, 02:30 UTCJun 25, 11:15 UTC8h 45m
2026-06-24 ALK153 - Jun 24, 13:20 UTCJun 25, 00:14 UTC10h 55m
2026-06-24 ALK308 - Jun 24, 09:49 UTCJun 24, 10:59 UTC1h 10m
2026-06-23 ALK26L - Jun 23, 22:19 UTCJun 23, 23:00 UTC40m
2026-06-23 ALK26L - Jun 23, 19:15 UTCJun 23, 19:34 UTC20m
2026-06-23 ALK25L CMB → DXB Jun 23, 13:39 UTCJun 23, 14:04 UTC25m
2026-06-23 ALK115 - Jun 23, 08:35 UTCJun 23, 11:04 UTC2h 30m
2026-06-22 ALK26L - Jun 22, 22:24 UTCJun 22, 23:05 UTC40m
2026-06-22 ALK26L - Jun 22, 19:14 UTCJun 22, 19:34 UTC20m
2026-06-22 ALK154 - Jun 22, 02:34 UTCJun 22, 14:19 UTC11h 45m
2026-06-21 ALK153 CMB → LHE Jun 21, 07:04 UTCJun 22, 00:04 UTC17h 0m

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

Mode-S 77058D frequently asked

What is Mode-S code 77058D?
77058D is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ALM.
Where is Mode-S 77058D registered?
Mode-S code 77058D 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 77058D broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 77058D, octal 35602615, decimal 7,800,205.
What flights does 77058D operate?
Mode-S 77058D has broadcast 20 distinct callsigns, including ALK604, ALK455, ALK606, ALK454, ALK605.