sensors Mode-S transponder
0ACB27
ICAO 24-bit transponder address · allocated to Costa Rica
Currently assigned to HK-4040
- Hex
- 0ACB27
- Octal
- 02545447
- Decimal
- 707,367
- Country
- CR
- Tail
- HK-4040
- Type
- PA34
- Flights observed
- 44
- Distinct callsigns
- 1
- Country
- CR
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 0ACB27 falls within the block assigned to Costa Rica (CR) by ICAO Annex 10, Volume III. Every aircraft registered in Costa Rica 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| HK4040 | - | 44 | 2026-07-22 |
Recent flights last 44
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | HK4040 | - | Jul 22, 19:10 UTC | Jul 22, 19:45 UTC | 35m |
| 2026-07-22 | HK4040 | - | Jul 22, 17:05 UTC | Jul 22, 17:50 UTC | 45m |
| 2026-07-22 | HK4040 | - | Jul 22, 15:35 UTC | Jul 22, 16:20 UTC | 45m |
| 2026-07-20 | HK4040 | - | Jul 20, 19:50 UTC | Jul 20, 20:00 UTC | 10m |
| 2026-07-19 | HK4040 | - | Jul 19, 12:15 UTC | Jul 19, 12:25 UTC | 10m |
| 2026-07-18 | HK4040 | - | Jul 18, 22:15 UTC | Jul 18, 22:25 UTC | 10m |
| 2026-07-18 | HK4040 | - | Jul 18, 12:45 UTC | Jul 18, 13:45 UTC | 1h 0m |
| 2026-07-17 | HK4040 | - | Jul 17, 16:55 UTC | Jul 17, 17:40 UTC | 45m |
| 2026-07-17 | HK4040 | - | Jul 17, 13:10 UTC | Jul 17, 14:10 UTC | 1h 0m |
| 2026-07-16 | HK4040 | - | Jul 16, 19:10 UTC | Jul 16, 19:55 UTC | 45m |
| 2026-07-15 | HK4040 | - | Jul 15, 13:55 UTC | Jul 15, 14:50 UTC | 55m |
| 2026-07-14 | HK4040 | - | Jul 14, 19:50 UTC | Jul 14, 20:40 UTC | 50m |
| 2026-07-14 | HK4040 | - | Jul 14, 16:20 UTC | Jul 14, 17:25 UTC | 1h 5m |
| 2026-07-13 | HK4040 | - | Jul 13, 15:20 UTC | Jul 13, 15:55 UTC | 35m |
| 2026-07-11 | HK4040 | - | Jul 11, 20:20 UTC | Jul 11, 20:30 UTC | 10m |
| 2026-07-10 | HK4040 | - | Jul 10, 16:10 UTC | Jul 10, 16:25 UTC | 15m |
| 2026-07-06 | HK4040 | - | Jul 6, 20:40 UTC | Jul 6, 20:50 UTC | 10m |
| 2026-07-06 | HK4040 | - | Jul 6, 19:40 UTC | Jul 6, 19:55 UTC | 15m |
| 2026-06-20 | HK4040 | - | Jun 20, 12:54 UTC | Jun 20, 13:44 UTC | 50m |
| 2026-06-19 | HK4040 | - | Jun 19, 17:55 UTC | Jun 19, 18:34 UTC | 40m |
| 2026-06-16 | HK4040 | - | Jun 16, 15:05 UTC | Jun 16, 15:35 UTC | 30m |
| 2026-06-15 | HK4040 | - | Jun 15, 14:00 UTC | Jun 15, 14:24 UTC | 25m |
| 2026-06-11 | HK4040 | - | Jun 11, 20:45 UTC | Jun 11, 21:00 UTC | 15m |
| 2026-06-08 | HK4040 | - | Jun 8, 20:05 UTC | Jun 8, 20:20 UTC | 15m |
| 2026-06-08 | HK4040 | - | Jun 8, 18:50 UTC | Jun 8, 19:00 UTC | 10m |
| 2026-06-05 | HK4040 | - | Jun 5, 17:35 UTC | Jun 5, 17:50 UTC | 15m |
| 2026-06-01 | HK4040 | - | Jun 1, 14:30 UTC | Jun 1, 15:25 UTC | 55m |
| 2026-05-31 | HK4040 | - | May 31, 21:35 UTC | May 31, 22:10 UTC | 35m |
| 2026-05-23 | HK4040 | - | May 23, 15:25 UTC | May 23, 15:35 UTC | 10m |
| 2026-05-20 | HK4040 | - | May 20, 12:15 UTC | May 20, 12:30 UTC | 15m |
| 2026-05-19 | HK4040 | - | May 19, 21:15 UTC | May 19, 21:35 UTC | 20m |
| 2026-05-17 | HK4040 | - | May 17, 12:45 UTC | May 17, 13:35 UTC | 50m |
| 2026-05-16 | HK4040 | - | May 16, 21:10 UTC | May 16, 21:35 UTC | 25m |
| 2026-05-16 | HK4040 | - | May 16, 15:45 UTC | May 16, 16:00 UTC | 15m |
| 2026-05-16 | HK4040 | - | May 16, 14:05 UTC | May 16, 14:16 UTC | 10m |
| 2026-05-15 | HK4040 | - | May 15, 12:45 UTC | May 15, 13:40 UTC | 55m |
| 2026-05-14 | HK4040 | - | May 14, 19:25 UTC | May 14, 19:55 UTC | 30m |
| 2026-05-05 | HK4040 | - | May 5, 12:40 UTC | May 5, 13:30 UTC | 50m |
| 2026-05-04 | HK4040 | - | May 4, 20:55 UTC | May 4, 21:30 UTC | 35m |
| 2026-04-23 | HK4040 | - | Apr 23, 12:05 UTC | Apr 23, 12:55 UTC | 50m |
| 2026-04-21 | HK4040 | - | Apr 21, 21:50 UTC | Apr 21, 22:15 UTC | 25m |
| 2026-04-20 | HK4040 | - | Apr 20, 20:10 UTC | Apr 20, 20:50 UTC | 40m |
| 2026-04-20 | HK4040 | - | Apr 20, 18:10 UTC | Apr 20, 18:45 UTC | 35m |
| 2026-04-16 | HK4040 | - | Apr 16, 18:10 UTC | Apr 16, 18:20 UTC | 10m |
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 HK-4040 page for operator, model, and routing details .