Apparatus

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sensors Mode-S transponder

0C21DD

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9813CMP · BOEING 737 MAX 8

Hex
0C21DD
Octal
03020735
Decimal
795,101
Country
SR
Tail
HP-9813CMP
Type
B38M
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
217
Distinct callsigns
20
Country
SR
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S 0C21DD.

Country allocation

The ICAO 24-bit address 0C21DD 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 Copa Airlines 9 2026-07-21
CMP138 - 8 2026-07-06
CMP752 - 7 2026-06-22
CMP734 Copa Airlines 7 2026-07-18
CMP821 Copa Airlines 6 2026-05-19
CMP479 - 5 2026-06-27
CMP456 Copa Airlines 5 2026-07-16
CMP446 Copa Airlines 5 2026-06-27
CMP421 Copa Airlines 5 2026-06-12
CMP149 - 5 2026-07-05
CMP470 Copa Airlines 4 2026-07-21
CMP450 - 4 2026-06-19
CMP422 Copa Airlines 4 2026-05-25
CMP253 - 4 2026-07-17
CMP236 - 4 2026-07-09
CMP753 Copa Airlines 3 2026-06-11
CMP484 Copa Airlines 3 2026-05-26
CMP474 Copa Airlines 3 2026-05-05
CMP451 - 3 2026-06-19
CMP194 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CMP880 PTY → ATL Jul 26, 10:35 UTCJul 26, 19:55 UTC9h 20m
2026-07-25 CMP240 PTY → MIA Jul 25, 23:10 UTCJul 25, 23:35 UTC25m
2026-07-25 CMP193 - Jul 25, 18:30 UTCJul 25, 18:45 UTC15m
2026-07-25 CMP836 ROS → PTY Jul 25, 05:25 UTCJul 25, 17:15 UTC11h 50m
2026-07-24 CMP882 PTY → ROS Jul 24, 16:05 UTCJul 25, 03:25 UTC11h 20m
2026-07-23 CMP126 VVI → PTY Jul 23, 19:30 UTCJul 24, 14:50 UTC19h 20m
2026-07-23 CMP126 VVI → PTY Jul 23, 17:45 UTCJul 24, 14:50 UTC21h 5m
2026-07-23 CMP127 PTY → VVI Jul 23, 05:20 UTCJul 24, 02:10 UTC20h 50m
2026-07-23 CMP127 PTY → VVI Jul 23, 05:00 UTCJul 24, 02:10 UTC21h 10m
2026-07-22 CMP220 VVI → PTY Jul 22, 23:05 UTCJul 23, 19:35 UTC20h 30m
2026-07-22 CMP471 YYZ → PTY Jul 22, 12:50 UTCJul 23, 05:45 UTC16h 55m
2026-07-21 CMP470 PTY → YYZ Jul 21, 14:55 UTCJul 22, 05:25 UTC14h 30m
2026-07-21 CMP470 PTY → YYZ Jul 21, 10:10 UTCJul 22, 05:25 UTC19h 15m
2026-07-21 CMP470 PTY → YYZ Jul 21, 08:25 UTCJul 22, 05:25 UTC21h 0m
2026-07-21 CMP470 PTY → YYZ Jul 21, 05:20 UTCJul 22, 05:15 UTC23h 55m
2026-07-21 CMP820 POA → PTY Jul 21, 05:10 UTCJul 22, 03:15 UTC22h 5m
2026-07-21 CMP820 POA → PTY Jul 21, 01:20 UTCJul 21, 20:05 UTC18h 45m
2026-07-20 CMP820 POA → PTY Jul 20, 21:20 UTCJul 21, 20:05 UTC22h 44m
2026-07-20 CMP820 POA → PTY Jul 20, 17:35 UTCJul 21, 16:15 UTC22h 39m
2026-07-20 CMP820 POA → PTY Jul 20, 16:50 UTCJul 21, 15:15 UTC22h 24m
2026-07-19 CMP140 MAO → PTY Jul 19, 22:40 UTCJul 20, 14:05 UTC15h 25m
2026-07-18 CMP734 CNF → PTY Jul 18, 21:35 UTCJul 19, 14:40 UTC17h 5m
2026-07-18 CMP734 CNF → PTY Jul 18, 18:20 UTCJul 19, 14:40 UTC20h 20m
2026-07-18 CMP734 CNF → PTY Jul 18, 16:15 UTCJul 19, 14:40 UTC22h 25m
2026-07-17 CMP285 CUN → MCO Jul 17, 19:20 UTCJul 18, 02:19 UTC7h 0m
2026-07-17 CMP253 LAS → CUN Jul 17, 08:20 UTCJul 17, 17:44 UTC9h 25m
2026-07-16 CMP456 PTY → LAS Jul 16, 19:55 UTCJul 17, 05:35 UTC9h 40m
2026-07-16 CMP737 - Jul 16, 10:20 UTCJul 16, 18:29 UTC8h 10m
2026-07-15 CMP737 JFK → JFK Jul 15, 10:20 UTCJul 16, 04:45 UTC18h 25m
2026-07-14 CMP804 - Jul 14, 09:20 UTCJul 15, 04:35 UTC19h 14m
2026-07-14 CMP253 LAS → JFK Jul 14, 07:55 UTCJul 15, 04:35 UTC20h 39m
2026-07-14 CMP456 - Jul 14, 01:35 UTCJul 14, 05:15 UTC3h 40m
2026-07-13 CMP384 - Jul 13, 19:20 UTCJul 14, 01:10 UTC5h 50m
2026-07-13 CMP139 - Jul 13, 10:15 UTCJul 13, 17:35 UTC7h 20m
2026-07-12 CMP172 - Jul 12, 14:15 UTCJul 13, 02:40 UTC12h 25m
2026-07-12 CMP195 - Jul 12, 12:15 UTCJul 12, 13:50 UTC1h 35m
2026-07-11 CMP194 GUA → MEX Jul 11, 22:35 UTCJul 12, 05:55 UTC7h 20m
2026-07-11 CMP380 - Jul 11, 08:20 UTCJul 11, 14:50 UTC6h 30m
2026-07-10 CMP263 - Jul 10, 23:10 UTCJul 11, 06:01 UTC6h 50m
2026-07-10 CMP633 - Jul 10, 16:15 UTCJul 10, 16:35 UTC20m
2026-07-10 CMP632 - Jul 10, 14:45 UTCJul 10, 14:55 UTC10m
2026-07-10 CMP118 - Jul 10, 08:00 UTCJul 10, 08:55 UTC55m
2026-07-09 CMP236 - Jul 9, 13:20 UTCJul 10, 00:20 UTC11h 0m
2026-07-08 CMP844 - Jul 8, 17:40 UTCJul 9, 08:05 UTC14h 25m
2026-07-08 CMP844 - Jul 8, 12:50 UTCJul 9, 08:05 UTC19h 15m
2026-07-08 CMP253 - Jul 8, 07:50 UTCJul 8, 12:30 UTC4h 40m
2026-07-07 CMP456 CUN → LAS Jul 7, 17:00 UTCJul 8, 05:25 UTC12h 25m
2026-07-07 CMP122 PTY → CUN Jul 7, 07:35 UTCJul 7, 15:10 UTC7h 35m
2026-07-06 CMP138 - Jul 6, 22:00 UTCJul 7, 00:35 UTC2h 35m
2026-07-06 CMP138 - Jul 6, 03:45 UTCJul 7, 00:35 UTC20h 50m

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-9813CMP page for operator, model, and routing details .

Mode-S 0C21DD frequently asked

What is Mode-S code 0C21DD?
0C21DD is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9813CMP.
Where is Mode-S 0C21DD registered?
Mode-S code 0C21DD is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21DD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21DD, octal 03020735, decimal 795,101.
What flights does 0C21DD operate?
Mode-S 0C21DD has broadcast 20 distinct callsigns, including CMP820, CMP138, CMP752, CMP734, CMP821.