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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 3h ago
Flights observed
187
Distinct callsigns
20
Country
SR
Last broadcast
3h ago

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
CMP138 - 8 2026-07-06
CMP752 - 7 2026-06-22
CMP821 Copa Airlines 6 2026-05-19
CMP479 - 5 2026-06-27
CMP446 Copa Airlines 5 2026-06-27
CMP421 Copa Airlines 5 2026-06-12
CMP149 - 5 2026-07-05
CMP820 Copa Airlines 4 2026-05-10
CMP734 Copa Airlines 4 2026-04-24
CMP456 - 4 2026-07-14
CMP450 - 4 2026-06-19
CMP422 Copa Airlines 4 2026-05-25
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
CMP253 - 3 2026-07-14
CMP194 - 3 2026-07-11
CMP172 - 3 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CMP253 - Jul 14, 07:55 UTCJul 14, 13:00 UTC5h 5m
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
2026-07-05 CMP138 - Jul 5, 23:35 UTCJul 6, 23:10 UTC23h 35m
2026-07-05 CMP361 - Jul 5, 22:40 UTCJul 6, 05:00 UTC6h 20m
2026-07-05 CMP149 - Jul 5, 07:35 UTCJul 5, 14:45 UTC7h 10m
2026-07-04 CMP138 - Jul 4, 22:00 UTCJul 5, 00:40 UTC2h 40m
2026-07-03 CMP143 - Jul 3, 22:50 UTCJul 3, 23:05 UTC15m
2026-07-03 CMP142 PTY → SJU Jul 3, 19:55 UTCJul 3, 20:05 UTC10m
2026-07-03 CMP104 CUN → PTY Jul 3, 12:20 UTCJul 3, 13:50 UTC1h 30m
2026-07-02 CMP103 - Jul 2, 18:05 UTCJul 3, 02:45 UTC8h 40m
2026-07-02 CMP288 - Jul 2, 16:05 UTCJul 2, 16:30 UTC25m
2026-07-01 CMP288 - Jul 1, 17:40 UTCJul 2, 16:30 UTC22h 50m
2026-07-01 CMP111 GUA → PTY Jul 1, 16:50 UTCJul 1, 18:00 UTC1h 10m
2026-07-01 CMP102 PTY → GUA Jul 1, 01:40 UTCJul 1, 15:30 UTC13h 50m
2026-06-30 CMP123 - Jun 30, 17:10 UTCJul 1, 15:15 UTC22h 5m
2026-06-30 CMP122 PTY → CUN Jun 30, 13:35 UTCJun 30, 15:20 UTC1h 45m
2026-06-29 CMP173 - Jun 29, 10:20 UTCJun 29, 12:09 UTC1h 50m
2026-06-29 CMP427 - Jun 29, 00:05 UTCJun 29, 02:05 UTC2h 0m
2026-06-27 CMP479 - Jun 27, 18:45 UTCJun 27, 20:59 UTC2h 15m
2026-06-27 CMP446 PTY → MCO Jun 27, 01:44 UTCJun 27, 16:24 UTC14h 40m
2026-06-26 CMP446 PTY → MCO Jun 26, 17:19 UTCJun 27, 16:24 UTC23h 5m
2026-06-26 CMP123 - Jun 26, 17:00 UTCJun 27, 14:20 UTC21h 20m
2026-06-26 CMP149 - Jun 26, 07:30 UTCJun 26, 15:34 UTC8h 5m
2026-06-25 CMP138 - Jun 25, 08:24 UTCJun 26, 01:29 UTC17h 5m
2026-06-25 CMP858 - Jun 25, 04:10 UTCJun 25, 06:40 UTC2h 30m
2026-06-24 CMP858 - Jun 24, 08:04 UTCJun 25, 06:40 UTC22h 35m
2026-06-23 CMP705 - Jun 23, 20:40 UTCJun 24, 05:49 UTC9h 10m
2026-06-23 CMP704 PTY → BOS Jun 23, 15:15 UTCJun 23, 18:04 UTC2h 50m
2026-06-22 CMP752 - Jun 22, 01:40 UTCJun 22, 17:25 UTC15h 45m
2026-06-21 CMP752 - Jun 21, 15:19 UTCJun 22, 09:34 UTC18h 15m
2026-06-20 CMP435 MCO → PTY Jun 20, 12:09 UTCJun 20, 14:19 UTC2h 10m
2026-06-19 CMP434 - Jun 19, 23:49 UTCJun 20, 02:14 UTC2h 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-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 3h ago.
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 CMP138, CMP752, CMP821, CMP479, CMP446.