Apparatus

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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
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
258
Distinct callsigns
20
Country
SR
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S 0C21B9.

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
CMP734 Copa Airlines 20 2026-07-24
CMP821 - 14 2026-07-07
CMP820 - 11 2026-07-05
CMP421 Copa Airlines 8 2026-06-07
CMP708 - 6 2026-07-18
CMP752 Copa Airlines 5 2026-07-17
CMP477 - 5 2026-07-13
CMP420 - 5 2026-07-10
CMP293 Copa Airlines 5 2026-07-01
CMP891 Copa Airlines 4 2026-06-09
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
CMP868 - 3 2026-07-15
CMP723 Copa Airlines 3 2026-06-16
CMP721 - 3 2026-06-16
CMP709 - 3 2026-07-18
CMP705 Copa Airlines 3 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CMP384 GUA → PTY Jul 26, 19:15 UTCJul 26, 20:35 UTC1h 20m
2026-07-26 CMP358 PTY → GUA Jul 26, 16:45 UTCJul 26, 17:55 UTC1h 10m
2026-07-25 CMP358 PTY → GUA Jul 25, 20:25 UTCJul 26, 17:55 UTC21h 31m
2026-07-25 CMP433 - Jul 25, 12:25 UTCJul 25, 19:00 UTC6h 35m
2026-07-24 CMP441 PTY → MIA Jul 24, 09:45 UTCJul 25, 02:25 UTC16h 40m
2026-07-24 CMP734 CNF → PTY Jul 24, 07:15 UTCJul 25, 02:25 UTC19h 10m
2026-07-24 CMP734 CNF → PTY Jul 24, 02:40 UTCJul 25, 02:15 UTC23h 35m
2026-07-23 CMP734 CNF → PTY Jul 23, 22:55 UTCJul 24, 19:35 UTC20h 40m
2026-07-23 CMP734 CNF → PTY Jul 23, 18:35 UTCJul 24, 17:05 UTC22h 30m
2026-07-23 CMP734 CNF → PTY Jul 23, 15:20 UTCJul 24, 11:10 UTC19h 50m
2026-07-23 CMP734 CNF → PTY Jul 23, 11:50 UTCJul 24, 09:45 UTC21h 55m
2026-07-22 CMP806 MCO → BOG Jul 22, 17:55 UTCJul 23, 01:00 UTC7h 5m
2026-07-22 CMP805 PTY → MCO Jul 22, 03:20 UTCJul 22, 15:55 UTC12h 35m
2026-07-21 CMP805 PTY → MCO Jul 21, 16:30 UTCJul 22, 15:55 UTC23h 25m
2026-07-21 CMP190 PTY → GEO Jul 21, 12:55 UTCJul 22, 05:25 UTC16h 30m
2026-07-21 CMP190 PTY → GEO Jul 21, 08:20 UTCJul 22, 05:25 UTC21h 5m
2026-07-21 CMP149 - Jul 21, 07:35 UTCJul 22, 05:25 UTC21h 50m
2026-07-20 CMP188 PTY → MEX Jul 20, 19:05 UTCJul 21, 03:45 UTC8h 39m
2026-07-20 CMP451 - Jul 20, 11:05 UTCJul 20, 17:00 UTC5h 55m
2026-07-20 CMP451 - Jul 20, 09:45 UTCJul 20, 10:00 UTC15m
2026-07-20 CMP450 PTY → SJU Jul 20, 01:50 UTCJul 20, 02:10 UTC20m
2026-07-19 CMP760 - Jul 19, 19:15 UTCJul 20, 00:35 UTC5h 20m
2026-07-18 CMP709 - Jul 18, 22:20 UTCJul 19, 17:05 UTC18h 45m
2026-07-18 CMP708 - Jul 18, 01:54 UTCJul 18, 18:55 UTC17h 1m
2026-07-17 CMP708 - Jul 17, 22:20 UTCJul 18, 18:55 UTC20h 36m
2026-07-17 CMP708 - Jul 17, 22:10 UTCJul 18, 18:55 UTC20h 46m
2026-07-17 CMP752 PTY → SSA Jul 17, 17:05 UTCJul 18, 15:15 UTC22h 11m
2026-07-16 CMP343 - Jul 16, 21:05 UTCJul 17, 15:15 UTC18h 10m
2026-07-16 CMP341 SJO → SJO Jul 16, 16:25 UTCJul 16, 19:55 UTC3h 30m
2026-07-16 CMP344 - Jul 16, 10:29 UTCJul 16, 15:05 UTC4h 35m
2026-07-15 CMP868 - Jul 15, 19:40 UTCJul 15, 22:00 UTC2h 20m
2026-07-15 CMP867 PTY → MCO Jul 15, 15:00 UTCJul 15, 17:15 UTC2h 15m
2026-07-15 CMP451 - Jul 15, 09:45 UTCJul 15, 10:00 UTC15m
2026-07-15 CMP450 - Jul 15, 02:00 UTCJul 15, 02:10 UTC10m
2026-07-14 CMP719 - Jul 14, 18:00 UTCJul 14, 20:55 UTC2h 55m
2026-07-13 CMP406 - Jul 13, 20:20 UTCJul 14, 01:10 UTC4h 50m
2026-07-13 CMP405 - Jul 13, 18:05 UTCJul 13, 18:30 UTC25m
2026-07-13 CMP477 - Jul 13, 05:01 UTCJul 13, 13:15 UTC8h 15m
2026-07-12 CMP476 IAD → DEN Jul 12, 10:40 UTCJul 12, 23:35 UTC12h 55m
2026-07-12 CMP404 - Jul 12, 04:30 UTCJul 12, 08:01 UTC3h 30m
2026-07-12 CMP839 - Jul 12, 00:35 UTCJul 12, 00:45 UTC10m
2026-07-10 CMP420 - Jul 10, 23:20 UTCJul 11, 14:05 UTC14h 45m
2026-07-10 CMP420 - Jul 10, 16:55 UTCJul 11, 14:05 UTC21h 10m
2026-07-10 CMP264 - Jul 10, 08:10 UTCJul 10, 15:00 UTC6h 50m
2026-07-09 CMP868 - Jul 9, 19:40 UTCJul 10, 03:15 UTC7h 35m
2026-07-09 CMP867 PTY → MCO Jul 9, 11:35 UTCJul 9, 17:20 UTC5h 45m
2026-07-07 CMP821 - Jul 7, 22:25 UTCJul 8, 17:35 UTC19h 10m
2026-07-07 CMP821 - Jul 7, 21:30 UTCJul 8, 17:35 UTC20h 5m
2026-07-07 CMP821 - Jul 7, 16:25 UTCJul 8, 15:25 UTC23h 0m
2026-07-07 CMP821 - Jul 7, 14:10 UTCJul 8, 09:10 UTC19h 0m

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 .

Mode-S 0C21B9 frequently asked

What is Mode-S code 0C21B9?
0C21B9 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9811CMP.
Where is Mode-S 0C21B9 registered?
Mode-S code 0C21B9 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21B9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21B9, octal 03020671, decimal 795,065.
What flights does 0C21B9 operate?
Mode-S 0C21B9 has broadcast 20 distinct callsigns, including CMP734, CMP821, CMP820, CMP421, CMP708.