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
- Flights observed
- 249
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- Jul 26, 19:20 UTC
Current position
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 | SriLankan Airlines | 40 | 2026-07-24 |
| ALK503 | SriLankan Airlines | 34 | 2026-07-26 |
| ALK604 | - | 16 | 2026-07-06 |
| ALK266 | SriLankan Airlines | 16 | 2026-07-25 |
| ALK265 | SriLankan Airlines | 8 | 2026-06-04 |
| ALK605 | - | 6 | 2026-07-07 |
| ALK600 | SriLankan Airlines | 6 | 2026-05-30 |
| ALK558 | - | 6 | 2026-07-22 |
| ALK455 | - | 6 | 2026-06-25 |
| ALK454 | - | 6 | 2026-06-24 |
| ALK26L | - | 6 | 2026-07-05 |
| ALK25L | SriLankan Airlines | 6 | 2026-06-18 |
| ALK90L | - | 4 | 2026-07-16 |
| ALK606 | - | 4 | 2026-07-13 |
| ALK557 | SriLankan Airlines | 4 | 2026-07-21 |
| ALK102 | - | 4 | 2026-07-10 |
| ALK884 | SriLankan Airlines | 3 | 2026-06-22 |
| ALK607 | - | 3 | 2026-07-14 |
| ALK308 | - | 3 | 2026-07-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | ALK503 | CMB → LHR | Jul 26, 08:35 UTC | Jul 26, 19:20 UTC | 10h 45m |
| 2026-07-25 | ALK266 | RUH → CMB | Jul 25, 13:40 UTC | Jul 26, 06:00 UTC | 16h 20m |
| 2026-07-24 | ALK504 | LHR → CMB | Jul 24, 21:00 UTC | Jul 25, 06:30 UTC | 9h 30m |
| 2026-07-24 | ALK503 | CMB → LHR | Jul 24, 15:20 UTC | Jul 24, 19:00 UTC | 3h 40m |
| 2026-07-24 | ALK503 | CMB → LHR | Jul 24, 08:05 UTC | Jul 24, 15:15 UTC | 7h 10m |
| 2026-07-24 | ALK122 | MAA → CMB | Jul 24, 04:45 UTC | Jul 24, 05:00 UTC | 15m |
| 2026-07-23 | ALK142 | BOM → CMB | Jul 23, 22:45 UTC | Jul 24, 03:35 UTC | 4h 50m |
| 2026-07-23 | ALK141 | CMB → BOM | Jul 23, 20:20 UTC | Jul 23, 20:30 UTC | 10m |
| 2026-07-23 | ALK141 | CMB → BOM | Jul 23, 12:35 UTC | Jul 23, 19:50 UTC | 7h 15m |
| 2026-07-22 | ALK558 | - | Jul 22, 15:50 UTC | Jul 23, 10:50 UTC | 19h 0m |
| 2026-07-22 | ALK558 | - | Jul 22, 14:20 UTC | Jul 23, 10:50 UTC | 20h 30m |
| 2026-07-21 | ALK557 | CMB → FRA | Jul 21, 19:25 UTC | Jul 22, 05:00 UTC | 9h 35m |
| 2026-07-19 | ALK558 | - | Jul 19, 15:50 UTC | Jul 20, 00:40 UTC | 8h 50m |
| 2026-07-18 | ALK557 | - | Jul 18, 19:05 UTC | Jul 19, 05:00 UTC | 9h 55m |
| 2026-07-17 | ALK504 | LHR → CMB | Jul 17, 21:20 UTC | Jul 18, 06:55 UTC | 9h 36m |
| 2026-07-17 | ALK503 | - | Jul 17, 08:10 UTC | Jul 17, 19:00 UTC | 10h 50m |
| 2026-07-16 | ALK90L | - | Jul 16, 07:50 UTC | Jul 17, 00:40 UTC | 16h 50m |
| 2026-07-15 | ALK558 | FRA → DAC | Jul 15, 15:05 UTC | Jul 16, 05:30 UTC | 14h 25m |
| 2026-07-14 | ALK557 | - | Jul 14, 20:00 UTC | Jul 15, 06:15 UTC | 10h 14m |
| 2026-07-14 | ALK607 | - | Jul 14, 06:30 UTC | Jul 14, 13:45 UTC | 7h 15m |
| 2026-07-13 | ALK606 | - | Jul 13, 11:25 UTC | Jul 14, 04:40 UTC | 17h 15m |
| 2026-07-12 | ALK558 | - | Jul 12, 15:50 UTC | Jul 13, 11:35 UTC | 19h 45m |
| 2026-07-12 | ALK558 | - | Jul 12, 14:25 UTC | Jul 13, 11:35 UTC | 21h 10m |
| 2026-07-11 | ALK557 | - | Jul 11, 19:25 UTC | Jul 12, 05:15 UTC | 9h 50m |
| 2026-07-11 | ALK309 | SIN → CMB | Jul 11, 14:00 UTC | Jul 11, 14:45 UTC | 45m |
| 2026-07-10 | ALK504 | - | Jul 10, 21:25 UTC | Jul 11, 12:30 UTC | 15h 5m |
| 2026-07-10 | ALK503 | - | Jul 10, 08:30 UTC | Jul 10, 19:20 UTC | 10h 50m |
| 2026-07-10 | ALK102 | - | Jul 10, 05:55 UTC | Jul 10, 06:05 UTC | 10m |
| 2026-07-09 | ALK266 | - | Jul 9, 13:40 UTC | Jul 10, 01:00 UTC | 11h 20m |
| 2026-07-09 | ALK90L | - | Jul 9, 07:15 UTC | Jul 9, 08:40 UTC | 1h 25m |
| 2026-07-08 | ALK564 | - | Jul 8, 13:25 UTC | Jul 9, 05:30 UTC | 16h 5m |
| 2026-07-07 | ALK563 | - | Jul 7, 20:30 UTC | Jul 8, 07:10 UTC | 10h 40m |
| 2026-07-07 | ALK605 | - | Jul 7, 06:25 UTC | Jul 7, 09:25 UTC | 3h 0m |
| 2026-07-06 | ALK604 | - | Jul 6, 11:10 UTC | Jul 7, 04:40 UTC | 17h 30m |
| 2026-07-06 | ALK604 | - | Jul 6, 08:25 UTC | Jul 7, 04:40 UTC | 20h 15m |
| 2026-07-05 | ALK26L | - | Jul 5, 19:30 UTC | Jul 5, 23:20 UTC | 3h 50m |
| 2026-07-04 | ALK504 | - | Jul 4, 21:50 UTC | Jul 5, 17:35 UTC | 19h 45m |
| 2026-07-04 | ALK504 | - | Jul 4, 21:15 UTC | Jul 5, 17:35 UTC | 20h 20m |
| 2026-07-04 | ALK503 | - | Jul 4, 08:05 UTC | Jul 4, 18:55 UTC | 10h 50m |
| 2026-07-03 | ALK564 | - | Jul 3, 13:35 UTC | Jul 4, 05:15 UTC | 15h 40m |
| 2026-07-02 | ALK563 | - | Jul 2, 20:35 UTC | Jul 3, 07:15 UTC | 10h 40m |
| 2026-07-02 | ALK309 | SIN → CMB | Jul 2, 13:05 UTC | Jul 2, 13:50 UTC | 45m |
| 2026-07-02 | ALK154 | - | Jul 2, 02:40 UTC | Jul 2, 11:20 UTC | 8h 40m |
| 2026-07-01 | ALK153 | - | Jul 1, 12:35 UTC | Jul 2, 00:05 UTC | 11h 30m |
| 2026-07-01 | ALK308 | - | Jul 1, 10:05 UTC | Jul 1, 11:00 UTC | 55m |
| 2026-06-30 | ALK142 | - | Jun 30, 21:55 UTC | Jun 30, 23:35 UTC | 1h 40m |
| 2026-06-30 | ALK141 | - | Jun 30, 04:30 UTC | Jun 30, 20:35 UTC | 16h 5m |
| 2026-06-29 | ALK504 | - | Jun 29, 23:49 UTC | Jun 30, 20:35 UTC | 20h 45m |
| 2026-06-29 | ALK504 | - | Jun 29, 21:50 UTC | Jun 30, 20:35 UTC | 22h 45m |
| 2026-06-29 | ALK504 | - | Jun 29, 20:49 UTC | Jun 30, 19:35 UTC | 22h 46m |
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 .