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sensors Mode-S transponder

0C21DF

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9815CMP · BOEING 737 MAX 8

Hex
0C21DF
Octal
03020737
Decimal
795,103
Country
SR
Tail
HP-9815CMP
Type
B38M
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
239
Distinct callsigns
20
Country
SR
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S 0C21DF.

Country allocation

The ICAO 24-bit address 0C21DF 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
CMP820 - 14 2026-07-14
CMP821 Copa Airlines 8 2026-07-21
CMP752 Copa Airlines 7 2026-05-10
CMP760 - 6 2026-07-23
CMP450 Copa Airlines 6 2026-07-24
CMP420 Copa Airlines 6 2026-05-09
CMP205 Copa Airlines 6 2026-06-09
CMP122 Copa Airlines 6 2026-06-29
CMP891 - 5 2026-07-10
CMP380 Copa Airlines 5 2026-05-19
CMP361 - 5 2026-06-30
CMP149 - 5 2026-06-30
CMP880 - 4 2026-07-10
CMP868 - 4 2026-07-16
CMP753 Copa Airlines 4 2026-05-12
CMP456 - 4 2026-06-22
CMP424 Copa Airlines 4 2026-04-29
CMP316 Copa Airlines 4 2026-06-08
CMP195 Copa Airlines 4 2026-05-23
CMP194 Copa Airlines 4 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CMP145 SJO → PTY Jul 26, 19:45 UTCJul 26, 20:00 UTC15m
2026-07-26 CMP290 ASU → PTY Jul 26, 09:45 UTCJul 26, 18:20 UTC8h 35m
2026-07-25 CMP291 PTY → ASU Jul 25, 21:55 UTCJul 26, 07:55 UTC10h 1m
2026-07-25 CMP324 PTY → CUN Jul 25, 15:10 UTCJul 25, 20:05 UTC4h 55m
2026-07-24 CMP709 BWI → PTY Jul 24, 21:20 UTCJul 25, 06:30 UTC9h 10m
2026-07-24 CMP708 - Jul 24, 10:45 UTCJul 24, 19:20 UTC8h 35m
2026-07-24 CMP451 SJU → PTY Jul 24, 09:45 UTCJul 24, 10:00 UTC15m
2026-07-24 CMP450 PTY → SJU Jul 24, 02:15 UTCJul 24, 02:25 UTC10m
2026-07-23 CMP760 - Jul 23, 19:10 UTCJul 24, 00:55 UTC5h 45m
2026-07-23 CMP203 - Jul 23, 11:35 UTCJul 23, 17:15 UTC5h 40m
2026-07-23 CMP202 PTY → CTG Jul 23, 03:40 UTCJul 23, 03:55 UTC15m
2026-07-22 CMP333 MIA → PTY Jul 22, 21:30 UTCJul 22, 23:15 UTC1h 45m
2026-07-21 CMP821 PTY → POA Jul 21, 23:50 UTCJul 22, 18:25 UTC18h 35m
2026-07-21 CMP821 PTY → POA Jul 21, 23:35 UTCJul 22, 18:25 UTC18h 50m
2026-07-21 CMP821 PTY → POA Jul 21, 17:35 UTCJul 22, 13:15 UTC19h 40m
2026-07-21 CMP821 PTY → POA Jul 21, 05:50 UTCJul 22, 05:05 UTC23h 15m
2026-07-21 CMP821 PTY → POA Jul 21, 04:35 UTCJul 22, 01:35 UTC21h 0m
2026-07-21 CMP221 - Jul 21, 00:40 UTCJul 21, 23:45 UTC23h 5m
2026-07-20 CMP709 BWI → PTY Jul 20, 21:50 UTCJul 21, 19:30 UTC21h 39m
2026-07-20 CMP709 BWI → PTY Jul 20, 21:15 UTCJul 21, 19:30 UTC22h 15m
2026-07-20 CMP708 - Jul 20, 10:30 UTCJul 20, 19:20 UTC8h 50m
2026-07-20 CMP200 - Jul 20, 01:10 UTCJul 20, 01:25 UTC15m
2026-07-19 CMP719 - Jul 19, 18:05 UTCJul 19, 20:55 UTC2h 50m
2026-07-18 CMP719 - Jul 18, 23:50 UTCJul 19, 20:55 UTC21h 5m
2026-07-18 CMP4437 - Jul 18, 23:25 UTCJul 19, 20:55 UTC21h 30m
2026-07-18 CMP4437 - Jul 18, 19:50 UTCJul 19, 18:25 UTC22h 35m
2026-07-18 CMP4447 - Jul 18, 16:15 UTCJul 18, 23:50 UTC7h 35m
2026-07-17 CMP445 MCO → SJO Jul 17, 23:35 UTCJul 18, 14:55 UTC15h 21m
2026-07-17 CMP478 BOG → MCO Jul 17, 14:04 UTCJul 17, 20:25 UTC6h 20m
2026-07-17 CMP876 - Jul 17, 03:14 UTCJul 17, 03:25 UTC10m
2026-07-16 CMP868 - Jul 16, 19:55 UTCJul 16, 22:15 UTC2h 20m
2026-07-16 CMP867 - Jul 16, 11:50 UTCJul 16, 17:30 UTC5h 40m
2026-07-15 CMP760 - Jul 15, 19:10 UTCJul 16, 01:00 UTC5h 50m
2026-07-14 CMP820 - Jul 14, 22:25 UTCJul 15, 17:05 UTC18h 39m
2026-07-14 CMP821 - Jul 14, 21:10 UTCJul 15, 17:05 UTC19h 54m
2026-07-14 CMP821 - Jul 14, 15:50 UTCJul 15, 10:35 UTC18h 44m
2026-07-14 CMP236 - Jul 14, 13:15 UTCJul 15, 10:35 UTC21h 19m
2026-07-14 CMP844 - Jul 14, 05:50 UTCJul 14, 10:05 UTC4h 15m
2026-07-13 CMP844 - Jul 13, 13:50 UTCJul 14, 10:05 UTC20h 15m
2026-07-13 CMP844 YUL → ORD Jul 13, 12:40 UTCJul 14, 10:05 UTC21h 25m
2026-07-12 CMP422 - Jul 12, 20:20 UTCJul 13, 04:20 UTC8h 0m
2026-07-12 CMP290 - Jul 12, 09:40 UTCJul 12, 18:40 UTC9h 0m
2026-07-11 CMP291 - Jul 11, 13:55 UTCJul 12, 08:05 UTC18h 10m
2026-07-11 CMP291 - Jul 11, 13:00 UTCJul 12, 08:05 UTC19h 5m
2026-07-10 CMP891 ATL → GUA Jul 10, 21:20 UTCJul 11, 04:40 UTC7h 20m
2026-07-10 CMP880 - Jul 10, 01:05 UTCJul 10, 19:15 UTC18h 10m
2026-07-09 CMP880 - Jul 9, 22:20 UTCJul 10, 19:15 UTC20h 55m
2026-07-09 CMP880 - Jul 9, 21:30 UTCJul 10, 19:15 UTC21h 45m
2026-07-09 CMP312 - Jul 9, 13:50 UTCJul 10, 09:15 UTC19h 25m
2026-07-09 CMP312 - Jul 9, 13:00 UTCJul 10, 09:15 UTC20h 15m

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-9815CMP page for operator, model, and routing details .

Mode-S 0C21DF frequently asked

What is Mode-S code 0C21DF?
0C21DF is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9815CMP.
Where is Mode-S 0C21DF registered?
Mode-S code 0C21DF is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21DF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21DF, octal 03020737, decimal 795,103.
What flights does 0C21DF operate?
Mode-S 0C21DF has broadcast 20 distinct callsigns, including CMP820, CMP821, CMP752, CMP760, CMP450.