sensors Mode-S transponder
0C21B9
ICAO 24-bit transponder address · allocated to Suriname
Currently assigned to HP-9811CMP · BOEING 737 MAX 8
- Hex
- 0C21B9
- Octal
- 03020671
- Decimal
- 795,065
- Country
- SR
- Tail
- HP-9811CMP
- Type
- B38M
- Flights observed
- 223
- Distinct callsigns
- 20
- Country
- SR
- Last broadcast
- 9h ago
Last known position
Country allocation
The ICAO 24-bit address 0C21B9 falls within the block assigned to Suriname (SR) by ICAO Annex 10, Volume III. Every aircraft registered in Suriname 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 |
|---|---|---|---|
| CMP821 | - | 14 | 2026-07-07 |
| CMP734 | - | 14 | 2026-06-17 |
| CMP820 | - | 11 | 2026-07-05 |
| CMP421 | Copa Airlines | 8 | 2026-06-07 |
| CMP477 | - | 5 | 2026-07-13 |
| CMP420 | - | 5 | 2026-07-10 |
| CMP293 | Copa Airlines | 5 | 2026-07-01 |
| CMP891 | Copa Airlines | 4 | 2026-06-09 |
| CMP752 | - | 4 | 2026-06-12 |
| CMP732 | Copa Airlines | 4 | 2026-05-17 |
| CMP263 | Copa Airlines | 4 | 2026-05-26 |
| CMP253 | Copa Airlines | 4 | 2026-06-01 |
| CMP205 | - | 4 | 2026-07-04 |
| CMP880 | Copa Airlines | 3 | 2026-06-09 |
| CMP723 | Copa Airlines | 3 | 2026-06-16 |
| CMP721 | - | 3 | 2026-06-16 |
| CMP708 | Copa Airlines | 3 | 2026-05-15 |
| CMP705 | Copa Airlines | 3 | 2026-04-21 |
| CMP479 | Copa Airlines | 3 | 2026-06-13 |
| CMP476 | - | 3 | 2026-07-12 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | CMP406 | - | Jul 13, 20:20 UTC | Jul 14, 01:10 UTC | 4h 50m |
| 2026-07-13 | CMP405 | - | Jul 13, 18:05 UTC | Jul 13, 18:30 UTC | 25m |
| 2026-07-13 | CMP477 | - | Jul 13, 05:01 UTC | Jul 13, 13:15 UTC | 8h 15m |
| 2026-07-12 | CMP476 | IAD → DEN | Jul 12, 10:40 UTC | Jul 12, 23:35 UTC | 12h 55m |
| 2026-07-12 | CMP404 | - | Jul 12, 04:30 UTC | Jul 12, 08:01 UTC | 3h 30m |
| 2026-07-12 | CMP839 | - | Jul 12, 00:35 UTC | Jul 12, 00:45 UTC | 10m |
| 2026-07-10 | CMP420 | - | Jul 10, 23:20 UTC | Jul 11, 14:05 UTC | 14h 45m |
| 2026-07-10 | CMP420 | - | Jul 10, 16:55 UTC | Jul 11, 14:05 UTC | 21h 10m |
| 2026-07-10 | CMP264 | - | Jul 10, 08:10 UTC | Jul 10, 15:00 UTC | 6h 50m |
| 2026-07-09 | CMP868 | - | Jul 9, 19:40 UTC | Jul 10, 03:15 UTC | 7h 35m |
| 2026-07-09 | CMP867 | PTY → MCO | Jul 9, 11:35 UTC | Jul 9, 17:20 UTC | 5h 45m |
| 2026-07-07 | CMP821 | - | Jul 7, 22:25 UTC | Jul 8, 17:35 UTC | 19h 10m |
| 2026-07-07 | CMP821 | - | Jul 7, 21:30 UTC | Jul 8, 17:35 UTC | 20h 5m |
| 2026-07-07 | CMP821 | - | Jul 7, 16:25 UTC | Jul 8, 15:25 UTC | 23h 0m |
| 2026-07-07 | CMP821 | - | Jul 7, 14:10 UTC | Jul 8, 09:10 UTC | 19h 0m |
| 2026-07-07 | CMP821 | - | Jul 7, 08:20 UTC | Jul 8, 05:55 UTC | 21h 35m |
| 2026-07-07 | CMP821 | - | Jul 7, 08:10 UTC | Jul 8, 05:55 UTC | 21h 45m |
| 2026-07-06 | CMP420 | - | Jul 6, 23:30 UTC | Jul 7, 21:40 UTC | 22h 10m |
| 2026-07-06 | CMP420 | - | Jul 6, 17:50 UTC | Jul 7, 14:15 UTC | 20h 25m |
| 2026-07-06 | CMP857 | - | Jul 6, 08:25 UTC | Jul 6, 16:10 UTC | 7h 45m |
| 2026-07-06 | CMP858 | - | Jul 6, 05:55 UTC | Jul 6, 06:50 UTC | 55m |
| 2026-07-05 | CMP709 | - | Jul 5, 21:40 UTC | Jul 6, 05:20 UTC | 7h 40m |
| 2026-07-05 | CMP820 | - | Jul 5, 01:25 UTC | Jul 5, 18:55 UTC | 17h 30m |
| 2026-07-04 | CMP820 | - | Jul 4, 22:25 UTC | Jul 5, 18:55 UTC | 20h 30m |
| 2026-07-04 | CMP820 | - | Jul 4, 16:40 UTC | Jul 5, 15:30 UTC | 22h 50m |
| 2026-07-04 | CMP820 | - | Jul 4, 14:20 UTC | Jul 5, 09:15 UTC | 18h 55m |
| 2026-07-04 | CMP821 | - | Jul 4, 06:20 UTC | Jul 5, 06:10 UTC | 23h 50m |
| 2026-07-04 | CMP821 | - | Jul 4, 02:20 UTC | Jul 5, 02:15 UTC | 23h 55m |
| 2026-07-04 | CMP205 | - | Jul 4, 01:30 UTC | Jul 4, 23:00 UTC | 21h 30m |
| 2026-07-03 | CMP205 | - | Jul 3, 23:35 UTC | Jul 4, 16:45 UTC | 17h 10m |
| 2026-07-03 | CMP205 | - | Jul 3, 08:35 UTC | Jul 4, 06:50 UTC | 22h 15m |
| 2026-07-03 | CMP205 | - | Jul 3, 06:20 UTC | Jul 4, 06:15 UTC | 23h 55m |
| 2026-07-03 | CMP820 | - | Jul 3, 05:15 UTC | Jul 4, 02:20 UTC | 21h 5m |
| 2026-07-03 | CMP820 | - | Jul 3, 02:20 UTC | Jul 4, 02:15 UTC | 23h 55m |
| 2026-07-03 | CMP820 | - | Jul 3, 01:30 UTC | Jul 4, 00:05 UTC | 22h 35m |
| 2026-07-02 | CMP820 | - | Jul 2, 16:20 UTC | Jul 3, 09:25 UTC | 17h 5m |
| 2026-07-01 | CMP293 | PTY → CUN | Jul 1, 20:25 UTC | Jul 2, 14:45 UTC | 18h 20m |
| 2026-07-01 | CMP293 | PTY → CUN | Jul 1, 17:25 UTC | Jul 2, 14:45 UTC | 21h 20m |
| 2026-07-01 | CMP742 | - | Jul 1, 12:20 UTC | Jul 1, 20:55 UTC | 8h 35m |
| 2026-06-30 | CMP868 | - | Jun 30, 21:50 UTC | Jul 1, 05:45 UTC | 7h 55m |
| 2026-06-30 | CMP403 | IAD → MCO | Jun 30, 06:35 UTC | Jun 30, 17:25 UTC | 10h 50m |
| 2026-06-29 | CMP448 | - | Jun 29, 18:10 UTC | Jun 30, 04:15 UTC | 10h 6m |
| 2026-06-28 | CMP106 | PTY → MGA | Jun 28, 23:04 UTC | Jun 29, 20:35 UTC | 21h 30m |
| 2026-06-28 | CMP128 | - | Jun 28, 19:44 UTC | Jun 28, 19:55 UTC | 10m |
| 2026-06-26 | CMP262 | CUN → PTY | Jun 26, 16:20 UTC | Jun 26, 17:50 UTC | 1h 30m |
| 2026-06-25 | CMP293 | PTY → CUN | Jun 25, 23:49 UTC | Jun 26, 14:50 UTC | 15h 0m |
| 2026-06-25 | CMP293 | PTY → CUN | Jun 25, 18:19 UTC | Jun 26, 14:50 UTC | 20h 30m |
| 2026-06-25 | CMP293 | PTY → CUN | Jun 25, 17:20 UTC | Jun 26, 14:50 UTC | 21h 30m |
| 2026-06-24 | CMP122 | PTY → CUN | Jun 24, 20:20 UTC | Jun 25, 15:50 UTC | 19h 30m |
| 2026-06-24 | CMP122 | PTY → CUN | Jun 24, 19:24 UTC | Jun 25, 15:50 UTC | 20h 25m |
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 HP-9811CMP page for operator, model, and routing details .