Apparatus

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sensors Mode-S transponder

0C21F9

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9817CMP · BOEING 737 MAX 8

Hex
0C21F9
Octal
03020771
Decimal
795,129
Country
SR
Tail
HP-9817CMP
Type
B38M
No current signal · last broadcast Jul 26, 21:20 UTC
Flights observed
233
Distinct callsigns
20
Country
SR
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S 0C21F9.

Country allocation

The ICAO 24-bit address 0C21F9 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 18 2026-07-20
CMP821 - 12 2026-07-11
CMP765 - 8 2026-07-14
CMP867 Copa Airlines 7 2026-06-23
CMP820 - 7 2026-07-12
CMP752 Copa Airlines 7 2026-06-03
CMP456 Copa Airlines 6 2026-07-17
CMP421 Copa Airlines 6 2026-06-05
CMP868 Copa Airlines 5 2026-06-24
CMP420 Copa Airlines 5 2026-05-27
CMP253 - 5 2026-07-18
CMP229 - 5 2026-07-10
CMP132 - 5 2026-07-09
CMP760 Copa Airlines 4 2026-06-16
CMP708 Copa Airlines 4 2026-06-07
CMP450 - 4 2026-07-05
CMP228 - 4 2026-07-10
CMP141 Copa Airlines 4 2026-07-19
CMP891 - 3 2026-07-16
CMP761 Copa Airlines 3 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CMP424 FLN → PTY Jul 26, 04:40 UTCJul 26, 21:20 UTC16h 41m
2026-07-25 CMP312 BOS → PTY Jul 25, 13:15 UTCJul 26, 03:10 UTC13h 55m
2026-07-24 CMP366 PTY → BOS Jul 24, 10:20 UTCJul 25, 01:45 UTC15h 25m
2026-07-24 CMP200 PTY → PEI Jul 24, 01:00 UTCJul 24, 01:25 UTC25m
2026-07-23 CMP154 - Jul 23, 20:25 UTCJul 23, 20:35 UTC10m
2026-07-23 CMP320 COR → PTY Jul 23, 10:15 UTCJul 23, 18:55 UTC8h 40m
2026-07-23 CMP354 CUN → PTY Jul 23, 00:10 UTCJul 23, 09:00 UTC8h 50m
2026-07-22 CMP178 PUJ → PTY Jul 22, 10:20 UTCJul 22, 23:00 UTC12h 40m
2026-07-22 CMP477 DEN → PTY Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-21 CMP476 PTY → DEN Jul 21, 19:15 UTCJul 21, 23:55 UTC4h 40m
2026-07-21 CMP150 - Jul 21, 12:45 UTCJul 21, 12:55 UTC10m
2026-07-21 CMP685 HAV → PTY Jul 21, 08:55 UTCJul 21, 09:20 UTC25m
2026-07-21 CMP684 - Jul 21, 04:45 UTCJul 21, 05:05 UTC20m
2026-07-20 CMP734 CNF → PTY Jul 20, 01:40 UTCJul 20, 18:15 UTC16h 35m
2026-07-19 CMP734 CNF → PTY Jul 19, 21:50 UTCJul 20, 18:15 UTC20h 25m
2026-07-19 CMP734 CNF → PTY Jul 19, 18:20 UTCJul 20, 18:15 UTC23h 55m
2026-07-19 CMP734 CNF → PTY Jul 19, 16:55 UTCJul 20, 14:35 UTC21h 40m
2026-07-19 CMP734 CNF → PTY Jul 19, 14:20 UTCJul 20, 13:45 UTC23h 25m
2026-07-19 CMP734 CNF → PTY Jul 19, 13:05 UTCJul 20, 10:05 UTC21h 0m
2026-07-19 CMP734 CNF → PTY Jul 19, 10:20 UTCJul 20, 10:05 UTC23h 45m
2026-07-19 CMP140 MAO → PTY Jul 19, 08:55 UTCJul 20, 06:55 UTC22h 0m
2026-07-19 CMP140 MAO → PTY Jul 19, 04:45 UTCJul 20, 01:40 UTC20h 55m
2026-07-19 CMP141 PTY → MAO Jul 19, 03:30 UTCJul 20, 01:40 UTC22h 10m
2026-07-18 CMP141 PTY → MAO Jul 18, 23:10 UTCJul 19, 22:15 UTC23h 5m
2026-07-18 CMP141 PTY → MAO Jul 18, 21:35 UTCJul 19, 18:20 UTC20h 45m
2026-07-18 CMP253 - Jul 18, 07:55 UTCJul 18, 18:20 UTC10h 25m
2026-07-17 CMP456 PTY → LAS Jul 17, 23:55 UTCJul 18, 05:25 UTC5h 31m
2026-07-17 CMP406 - Jul 17, 20:40 UTCJul 17, 20:50 UTC10m
2026-07-17 CMP405 - Jul 17, 18:19 UTCJul 17, 18:44 UTC25m
2026-07-16 CMP891 - Jul 16, 22:30 UTCJul 17, 12:55 UTC14h 25m
2026-07-16 CMP880 - Jul 16, 10:45 UTCJul 16, 19:14 UTC8h 30m
2026-07-15 CMP734 - Jul 15, 05:55 UTCJul 15, 23:35 UTC17h 40m
2026-07-15 CMP734 - Jul 15, 01:00 UTCJul 15, 23:35 UTC22h 35m
2026-07-14 CMP734 - Jul 14, 22:45 UTCJul 15, 22:00 UTC23h 15m
2026-07-14 CMP765 - Jul 14, 21:20 UTCJul 15, 16:25 UTC19h 4m
2026-07-14 CMP765 - Jul 14, 16:45 UTCJul 15, 14:05 UTC21h 19m
2026-07-14 CMP765 - Jul 14, 14:30 UTCJul 15, 14:05 UTC23h 34m
2026-07-14 CMP765 - Jul 14, 08:20 UTCJul 15, 06:40 UTC22h 19m
2026-07-14 CMP765 - Jul 14, 08:10 UTCJul 15, 06:15 UTC22h 4m
2026-07-13 CMP266 - Jul 13, 22:30 UTCJul 14, 06:05 UTC7h 35m
2026-07-13 CMP763 SJO → FLL Jul 13, 14:25 UTCJul 13, 19:50 UTC5h 25m
2026-07-12 CMP732 - Jul 12, 22:40 UTCJul 13, 13:10 UTC14h 30m
2026-07-12 CMP732 - Jul 12, 08:45 UTCJul 13, 08:15 UTC23h 30m
2026-07-12 CMP820 - Jul 12, 05:10 UTCJul 13, 00:45 UTC19h 35m
2026-07-11 CMP821 - Jul 11, 15:30 UTCJul 12, 09:30 UTC18h 0m
2026-07-11 CMP821 - Jul 11, 12:20 UTCJul 12, 09:30 UTC21h 10m
2026-07-11 CMP821 - Jul 11, 12:00 UTCJul 12, 09:30 UTC21h 30m
2026-07-11 CMP821 - Jul 11, 08:20 UTCJul 12, 06:10 UTC21h 50m
2026-07-11 CMP821 - Jul 11, 07:05 UTCJul 12, 06:10 UTC23h 5m
2026-07-11 CMP821 - Jul 11, 05:05 UTCJul 12, 02:05 UTC21h 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-9817CMP page for operator, model, and routing details .

Mode-S 0C21F9 frequently asked

What is Mode-S code 0C21F9?
0C21F9 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9817CMP.
Where is Mode-S 0C21F9 registered?
Mode-S code 0C21F9 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21F9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21F9, octal 03020771, decimal 795,129.
What flights does 0C21F9 operate?
Mode-S 0C21F9 has broadcast 20 distinct callsigns, including CMP734, CMP821, CMP765, CMP867, CMP820.