Apparatus

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sensors Mode-S transponder

77058F

ICAO 24-bit transponder address · allocated to Sri Lanka

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

Hex
77058F
Octal
35602617
Decimal
7,800,207
Country
LK
Tail
4R-ALO
Type
A333
No current signal · last broadcast 5h ago
Flights observed
230
Distinct callsigns
20
Country
LK
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 77058F.

Country allocation

The ICAO 24-bit address 77058F 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
ALK501 - 45 2026-06-28
ALK504 - 38 2026-07-10
ALK503 - 30 2026-07-10
ALK604 - 16 2026-07-06
ALK266 - 15 2026-07-09
ALK265 SriLankan Airlines 8 2026-06-04
ALK605 - 6 2026-07-07
ALK600 SriLankan Airlines 6 2026-05-30
ALK455 - 6 2026-06-25
ALK454 - 6 2026-06-24
ALK26L - 6 2026-07-05
ALK25L SriLankan Airlines 6 2026-06-18
ALK606 - 4 2026-07-13
ALK102 - 4 2026-07-10
ALK90L - 3 2026-07-09
ALK884 SriLankan Airlines 3 2026-06-22
ALK607 - 3 2026-07-14
ALK308 - 3 2026-07-01
ALK89L SriLankan Airlines 2 2026-04-20
ALK564 - 2 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ALK607 - Jul 14, 06:30 UTCJul 14, 07:05 UTC35m
2026-07-13 ALK606 - Jul 13, 11:25 UTCJul 14, 04:40 UTC17h 15m
2026-07-12 ALK558 - Jul 12, 15:50 UTCJul 13, 11:35 UTC19h 45m
2026-07-12 ALK558 - Jul 12, 14:25 UTCJul 13, 11:35 UTC21h 10m
2026-07-11 ALK557 - Jul 11, 19:25 UTCJul 12, 05:15 UTC9h 50m
2026-07-11 ALK309 SIN → CMB Jul 11, 14:00 UTCJul 11, 14:45 UTC45m
2026-07-10 ALK504 - Jul 10, 21:25 UTCJul 11, 12:30 UTC15h 5m
2026-07-10 ALK503 - Jul 10, 08:30 UTCJul 10, 19:20 UTC10h 50m
2026-07-10 ALK102 - Jul 10, 05:55 UTCJul 10, 06:05 UTC10m
2026-07-09 ALK266 - Jul 9, 13:40 UTCJul 10, 01:00 UTC11h 20m
2026-07-09 ALK90L - Jul 9, 07:15 UTCJul 9, 08:40 UTC1h 25m
2026-07-08 ALK564 - Jul 8, 13:25 UTCJul 9, 05:30 UTC16h 5m
2026-07-07 ALK563 - Jul 7, 20:30 UTCJul 8, 07:10 UTC10h 40m
2026-07-07 ALK605 - Jul 7, 06:25 UTCJul 7, 09:25 UTC3h 0m
2026-07-06 ALK604 - Jul 6, 11:10 UTCJul 7, 04:40 UTC17h 30m
2026-07-06 ALK604 - Jul 6, 08:25 UTCJul 7, 04:40 UTC20h 15m
2026-07-05 ALK26L - Jul 5, 19:30 UTCJul 5, 23:20 UTC3h 50m
2026-07-04 ALK504 - Jul 4, 21:50 UTCJul 5, 17:35 UTC19h 45m
2026-07-04 ALK504 - Jul 4, 21:15 UTCJul 5, 17:35 UTC20h 20m
2026-07-04 ALK503 - Jul 4, 08:05 UTCJul 4, 18:55 UTC10h 50m
2026-07-03 ALK564 - Jul 3, 13:35 UTCJul 4, 05:15 UTC15h 40m
2026-07-02 ALK563 - Jul 2, 20:35 UTCJul 3, 07:15 UTC10h 40m
2026-07-02 ALK309 SIN → CMB Jul 2, 13:05 UTCJul 2, 13:50 UTC45m
2026-07-02 ALK154 - Jul 2, 02:40 UTCJul 2, 11:20 UTC8h 40m
2026-07-01 ALK153 - Jul 1, 12:35 UTCJul 2, 00:05 UTC11h 30m
2026-07-01 ALK308 - Jul 1, 10:05 UTCJul 1, 11:00 UTC55m
2026-06-30 ALK142 - Jun 30, 21:55 UTCJun 30, 23:35 UTC1h 40m
2026-06-30 ALK141 - Jun 30, 04:30 UTCJun 30, 20:35 UTC16h 5m
2026-06-29 ALK504 - Jun 29, 23:49 UTCJun 30, 20:35 UTC20h 45m
2026-06-29 ALK504 - Jun 29, 21:50 UTCJun 30, 20:35 UTC22h 45m
2026-06-29 ALK504 - Jun 29, 20:49 UTCJun 30, 19:35 UTC22h 46m
2026-06-29 ALK503 - Jun 29, 00:34 UTCJun 29, 18:39 UTC18h 5m
2026-06-28 ALK503 - Jun 28, 22:15 UTCJun 29, 18:39 UTC20h 25m
2026-06-28 ALK503 - Jun 28, 17:50 UTCJun 29, 17:45 UTC23h 55m
2026-06-28 ALK501 - Jun 28, 15:49 UTCJun 29, 15:45 UTC23h 55m
2026-06-28 ALK501 - Jun 28, 10:50 UTCJun 28, 11:39 UTC50m
2026-06-27 ALK501 - Jun 27, 22:29 UTCJun 28, 08:39 UTC10h 10m
2026-06-27 ALK501 - Jun 27, 06:19 UTCJun 28, 05:45 UTC23h 25m
2026-06-26 ALK604 - Jun 26, 12:34 UTCJun 27, 04:24 UTC15h 50m
2026-06-26 ALK308 - Jun 26, 09:59 UTCJun 26, 11:00 UTC1h 0m
2026-06-25 ALK455 - Jun 25, 05:50 UTCJun 26, 00:45 UTC18h 55m
2026-06-25 ALK455 - Jun 25, 03:50 UTCJun 26, 00:45 UTC20h 55m
2026-06-25 ALK455 - Jun 25, 02:59 UTCJun 26, 00:45 UTC21h 45m
2026-06-24 ALK454 - Jun 24, 04:59 UTCJun 24, 23:20 UTC18h 20m
2026-06-24 ALK454 - Jun 24, 02:24 UTCJun 24, 23:20 UTC20h 55m
2026-06-23 ALK266 - Jun 23, 13:05 UTCJun 24, 00:20 UTC11h 15m
2026-06-22 ALK885 - Jun 22, 20:30 UTCJun 23, 05:34 UTC9h 5m
2026-06-22 ALK884 CMB → CAN Jun 22, 17:25 UTCJun 22, 17:34 UTC10m
2026-06-21 ALK504 - Jun 21, 21:49 UTCJun 22, 16:54 UTC19h 5m
2026-06-21 ALK504 - Jun 21, 21:05 UTCJun 22, 16:54 UTC19h 50m

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

Mode-S 77058F frequently asked

What is Mode-S code 77058F?
77058F is an ICAO 24-bit transponder address. Allocated to Sri Lanka. Assigned to 4R-ALO.
Where is Mode-S 77058F registered?
Mode-S code 77058F 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 77058F broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 77058F, octal 35602617, decimal 7,800,207.
What flights does 77058F operate?
Mode-S 77058F has broadcast 20 distinct callsigns, including ALK501, ALK504, ALK503, ALK604, ALK266.