sensors Mode-S transponder
77044E
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ABN · AIRBUS A-320
- Hex
- 77044E
- Octal
- 35602116
- Decimal
- 7,799,886
- Country
- LK
- Tail
- 4R-ABN
- Type
- A320
- Flights observed
- 161
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- Jul 26, 17:15 UTC
Last known position
Country allocation
The ICAO 24-bit address 77044E 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 |
|---|---|---|---|
| ALK195 | SriLankan Airlines | 14 | 2026-07-23 |
| ALK306 | SriLankan Airlines | 11 | 2026-07-24 |
| ALK141 | - | 11 | 2026-06-21 |
| ALK196 | - | 8 | 2026-07-23 |
| ALK142 | - | 7 | 2026-06-21 |
| ALK403 | SriLankan Airlines | 6 | 2026-07-24 |
| ALK191 | SriLankan Airlines | 6 | 2026-07-25 |
| ALK402 | - | 5 | 2026-07-06 |
| ALK192 | SriLankan Airlines | 5 | 2026-07-26 |
| ALK144 | - | 5 | 2026-07-04 |
| ALK404 | - | 4 | 2026-06-28 |
| ALK319 | - | 4 | 2026-07-16 |
| ALK318 | - | 4 | 2026-07-13 |
| ALK307 | SriLankan Airlines | 4 | 2026-07-22 |
| ALK151 | SriLankan Airlines | 4 | 2026-06-12 |
| ALK143 | SriLankan Airlines | 4 | 2026-07-04 |
| ALK1173 | - | 4 | 2026-07-10 |
| ALK314 | - | 3 | 2026-06-21 |
| ALK172 | SriLankan Airlines | 3 | 2026-06-15 |
| ALK171 | SriLankan Airlines | 3 | 2026-06-15 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | ALK103 | CMB → MLE | Jul 26, 14:00 UTC | Jul 26, 17:15 UTC | 3h 15m |
| 2026-07-26 | ALK166 | COK → CMB | Jul 26, 06:35 UTC | Jul 26, 07:05 UTC | 30m |
| 2026-07-26 | ALK192 | DEL → CMB | Jul 26, 00:10 UTC | Jul 26, 05:25 UTC | 5h 15m |
| 2026-07-25 | ALK191 | CMB → DEL | Jul 25, 04:10 UTC | Jul 25, 22:35 UTC | 18h 25m |
| 2026-07-24 | ALK306 | CMB → SIN | Jul 24, 23:35 UTC | Jul 25, 00:35 UTC | 1h 0m |
| 2026-07-24 | ALK168 | COK → CMB | Jul 24, 10:50 UTC | Jul 24, 11:20 UTC | 30m |
| 2026-07-24 | ALK403 | BKK → CMB | Jul 24, 00:55 UTC | Jul 24, 09:30 UTC | 8h 35m |
| 2026-07-23 | ALK196 | - | Jul 23, 13:50 UTC | Jul 23, 23:05 UTC | 9h 15m |
| 2026-07-23 | ALK195 | CMB → DEL | Jul 23, 09:35 UTC | Jul 23, 12:25 UTC | 2h 50m |
| 2026-07-22 | ALK195 | CMB → DEL | Jul 22, 15:35 UTC | Jul 23, 12:25 UTC | 20h 50m |
| 2026-07-22 | ALK195 | CMB → DEL | Jul 22, 13:35 UTC | Jul 23, 12:25 UTC | 22h 50m |
| 2026-07-22 | ALK196 | - | Jul 22, 13:25 UTC | Jul 23, 11:30 UTC | 22h 5m |
| 2026-07-22 | ALK307 | SIN → CMB | Jul 22, 01:55 UTC | Jul 22, 12:00 UTC | 10h 5m |
| 2026-07-21 | ALK306 | CMB → SIN | Jul 21, 23:15 UTC | Jul 22, 00:10 UTC | 55m |
| 2026-07-21 | ALK306 | CMB → SIN | Jul 21, 02:20 UTC | Jul 22, 00:10 UTC | 21h 50m |
| 2026-07-20 | ALK306 | CMB → SIN | Jul 20, 23:25 UTC | Jul 21, 00:25 UTC | 59m |
| 2026-07-20 | ALK306 | CMB → SIN | Jul 20, 02:10 UTC | Jul 21, 00:25 UTC | 22h 14m |
| 2026-07-19 | ALK186 | - | Jul 19, 13:40 UTC | Jul 20, 00:05 UTC | 10h 25m |
| 2026-07-19 | ALK192 | DEL → CMB | Jul 19, 00:40 UTC | Jul 19, 11:40 UTC | 11h 0m |
| 2026-07-18 | ALK191 | CMB → DEL | Jul 18, 13:15 UTC | Jul 18, 22:20 UTC | 9h 5m |
| 2026-07-18 | ALK195 | - | Jul 18, 02:14 UTC | Jul 18, 11:50 UTC | 9h 36m |
| 2026-07-17 | ALK306 | - | Jul 17, 13:20 UTC | Jul 18, 00:15 UTC | 10h 55m |
| 2026-07-17 | ALK195 | - | Jul 17, 02:15 UTC | Jul 17, 11:55 UTC | 9h 40m |
| 2026-07-16 | ALK306 | - | Jul 16, 23:29 UTC | Jul 17, 00:35 UTC | 1h 5m |
| 2026-07-16 | ALK140 | - | Jul 16, 10:29 UTC | Jul 16, 10:40 UTC | 10m |
| 2026-07-16 | ALK319 | - | Jul 16, 00:50 UTC | Jul 16, 01:15 UTC | 25m |
| 2026-07-15 | ALK196 | - | Jul 15, 13:25 UTC | Jul 15, 23:10 UTC | 9h 45m |
| 2026-07-15 | ALK195 | - | Jul 15, 00:55 UTC | Jul 15, 11:55 UTC | 11h 0m |
| 2026-07-14 | ALK196 | - | Jul 14, 13:25 UTC | Jul 14, 23:10 UTC | 9h 44m |
| 2026-07-14 | ALK195 | - | Jul 14, 01:05 UTC | Jul 14, 11:50 UTC | 10h 45m |
| 2026-07-13 | ALK318 | - | Jul 13, 15:55 UTC | Jul 13, 22:55 UTC | 7h 0m |
| 2026-07-13 | ALK307 | - | Jul 13, 02:05 UTC | Jul 13, 14:35 UTC | 12h 30m |
| 2026-07-12 | ALK306 | - | Jul 12, 10:50 UTC | Jul 13, 00:20 UTC | 13h 30m |
| 2026-07-12 | ALK319 | - | Jul 12, 00:55 UTC | Jul 12, 23:30 UTC | 22h 35m |
| 2026-07-11 | ALK318 | - | Jul 11, 04:50 UTC | Jul 11, 22:55 UTC | 18h 5m |
| 2026-07-10 | ALK1173 | - | Jul 10, 08:55 UTC | Jul 11, 03:20 UTC | 18h 25m |
| 2026-07-10 | ALK1173 | - | Jul 10, 06:10 UTC | Jul 11, 03:20 UTC | 21h 10m |
| 2026-07-10 | ALK403 | - | Jul 10, 01:00 UTC | Jul 10, 09:05 UTC | 8h 5m |
| 2026-07-09 | ALK166 | - | Jul 9, 04:40 UTC | Jul 9, 22:55 UTC | 18h 15m |
| 2026-07-09 | ALK165 | - | Jul 9, 03:00 UTC | Jul 9, 03:30 UTC | 30m |
| 2026-07-08 | ALK165 | - | Jul 8, 05:55 UTC | Jul 9, 03:30 UTC | 21h 35m |
| 2026-07-07 | ALK186 | - | Jul 7, 16:25 UTC | Jul 8, 06:05 UTC | 13h 40m |
| 2026-07-07 | ALK403 | - | Jul 7, 00:50 UTC | Jul 7, 15:00 UTC | 14h 10m |
| 2026-07-06 | ALK402 | - | Jul 6, 22:40 UTC | Jul 6, 23:10 UTC | 30m |
| 2026-07-06 | ALK168 | - | Jul 6, 10:45 UTC | Jul 6, 11:20 UTC | 35m |
| 2026-07-06 | ALK167 | - | Jul 6, 09:00 UTC | Jul 6, 09:30 UTC | 30m |
| 2026-07-06 | ALK307 | - | Jul 6, 02:05 UTC | Jul 6, 02:45 UTC | 40m |
| 2026-07-05 | ALK306 | - | Jul 5, 05:55 UTC | Jul 6, 00:15 UTC | 18h 20m |
| 2026-07-05 | ALK306 | - | Jul 5, 01:35 UTC | Jul 6, 00:15 UTC | 22h 40m |
| 2026-07-05 | ALK403 | - | Jul 5, 00:50 UTC | Jul 5, 23:30 UTC | 22h 40m |
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-ABN page for operator, model, and routing details .