sensors Mode-S transponder

0C21B8

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9810CMP · BOEING 737 MAX 8

Hex
0C21B8
Octal
03020670
Decimal
795,064
Country
SR
Tail
HP-9810CMP
Type
B38M
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
239
Distinct callsigns
20
Country
SR
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 0C21B8.

Country allocation

The ICAO 24-bit address 0C21B8 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 2026-07-24
CMP820 - 16 2026-07-02
CMP253 Copa Airlines 14 2026-05-29
CMP456 Copa Airlines 13 2026-05-28
CMP205 - 11 2026-07-16
CMP476 - 9 2026-07-13
CMP752 Copa Airlines 8 2026-06-06
CMP821 - 7 2026-06-19
CMP423 - 7 2026-07-14
CMP753 Copa Airlines 6 2026-05-30
CMP477 - 6 2026-07-14
CMP478 - 4 2026-06-30
CMP228 Copa Airlines 4 2026-06-21
CMP204 - 4 2026-07-16
CMP195 - 4 2026-07-17
CMP149 - 4 2026-07-20
CMP721 Copa Airlines 3 2026-05-25
CMP496 Copa Airlines 3 2026-05-26
CMP451 - 3 2026-07-19
CMP450 Copa Airlines 3 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CMP361 GUA → PTY Jul 25, 22:40 UTCJul 26, 21:45 UTC23h 6m
2026-07-24 CMP734 CNF → PTY Jul 24, 22:05 UTCJul 25, 14:45 UTC16h 40m
2026-07-24 CMP734 CNF → PTY Jul 24, 18:05 UTCJul 25, 14:45 UTC20h 40m
2026-07-24 CMP349 AUA → PTY Jul 24, 17:30 UTCJul 25, 14:45 UTC21h 15m
2026-07-24 CMP348 PTY → AUA Jul 24, 09:30 UTCJul 24, 16:00 UTC6h 30m
2026-07-23 CMP465 - Jul 23, 12:05 UTCJul 24, 00:50 UTC12h 45m
2026-07-22 CMP266 FLL → PTY Jul 22, 22:20 UTCJul 23, 03:50 UTC5h 30m
2026-07-22 CMP265 PTY → FLL Jul 22, 12:50 UTCJul 22, 20:05 UTC7h 15m
2026-07-22 CMP441 PTY → MIA Jul 22, 00:40 UTCJul 22, 02:35 UTC1h 55m
2026-07-21 CMP405 - Jul 21, 14:30 UTCJul 21, 18:40 UTC4h 10m
2026-07-20 CMP126 BOG → SJO Jul 20, 19:05 UTCJul 21, 13:15 UTC18h 9m
2026-07-20 CMP149 MEX → BOG Jul 20, 07:35 UTCJul 20, 14:20 UTC6h 45m
2026-07-19 CMP138 PTY → MEX Jul 19, 11:00 UTCJul 20, 02:15 UTC15h 15m
2026-07-19 CMP451 - Jul 19, 09:40 UTCJul 19, 09:55 UTC15m
2026-07-19 CMP450 PTY → SJU Jul 19, 02:00 UTCJul 19, 02:15 UTC15m
2026-07-18 CMP180 GEO → PTY Jul 18, 10:55 UTCJul 19, 00:40 UTC13h 45m
2026-07-18 CMP451 - Jul 18, 09:45 UTCJul 18, 10:00 UTC15m
2026-07-18 CMP450 PTY → SJU Jul 18, 02:05 UTCJul 18, 02:19 UTC15m
2026-07-17 CMP195 - Jul 17, 12:25 UTCJul 18, 00:50 UTC12h 25m
2026-07-16 CMP858 - Jul 16, 23:49 UTCJul 17, 06:45 UTC6h 55m
2026-07-16 CMP204 - Jul 16, 06:05 UTCJul 16, 22:19 UTC16h 15m
2026-07-16 CMP204 - Jul 16, 02:05 UTCJul 16, 22:19 UTC20h 15m
2026-07-16 CMP205 - Jul 16, 00:05 UTCJul 16, 22:19 UTC22h 15m
2026-07-15 CMP205 - Jul 15, 22:25 UTCJul 16, 22:00 UTC23h 35m
2026-07-15 CMP205 - Jul 15, 18:10 UTCJul 16, 16:44 UTC22h 35m
2026-07-15 CMP424 - Jul 15, 04:30 UTCJul 15, 15:15 UTC10h 45m
2026-07-14 CMP423 - Jul 14, 16:25 UTCJul 15, 03:10 UTC10h 44m
2026-07-14 CMP477 DEN → CUN Jul 14, 05:00 UTCJul 14, 14:40 UTC9h 40m
2026-07-13 CMP476 COR → DEN Jul 13, 10:05 UTCJul 14, 00:00 UTC13h 55m
2026-07-12 CMP354 - Jul 12, 22:40 UTCJul 13, 08:45 UTC10h 5m
2026-07-11 CMP734 - Jul 11, 21:35 UTCJul 12, 14:35 UTC17h 0m
2026-07-11 CMP734 - Jul 11, 16:55 UTCJul 12, 14:35 UTC21h 40m
2026-07-11 CMP484 YUL → PTY Jul 11, 14:05 UTCJul 12, 13:35 UTC23h 30m
2026-07-11 CMP484 YUL → PTY Jul 11, 12:40 UTCJul 12, 10:15 UTC21h 35m
2026-07-11 CMP422 - Jul 11, 00:05 UTCJul 11, 04:30 UTC4h 25m
2026-07-08 CMP833 JFK → PTY Jul 8, 20:05 UTCJul 9, 15:40 UTC19h 35m
2026-07-08 CMP832 PTY → CUR Jul 8, 18:05 UTCJul 8, 18:20 UTC15m
2026-07-06 CMP734 - Jul 6, 22:05 UTCJul 7, 16:20 UTC18h 15m
2026-07-06 CMP734 - Jul 6, 21:45 UTCJul 7, 16:20 UTC18h 35m
2026-07-05 CMP897 - Jul 5, 08:20 UTCJul 5, 12:55 UTC4h 35m
2026-07-05 CMP899 - Jul 5, 02:05 UTCJul 5, 06:20 UTC4h 15m
2026-07-03 CMP732 - Jul 3, 00:10 UTCJul 3, 08:45 UTC8h 35m
2026-07-02 CMP820 - Jul 2, 06:15 UTCJul 3, 00:45 UTC18h 30m
2026-07-02 CMP820 - Jul 2, 02:05 UTCJul 3, 00:45 UTC22h 40m
2026-07-01 CMP820 - Jul 1, 16:25 UTCJul 2, 09:35 UTC17h 10m
2026-07-01 CMP445 MCO → CUN Jul 1, 05:35 UTCJul 1, 14:50 UTC9h 15m
2026-06-30 CMP478 - Jun 30, 12:10 UTCJun 30, 20:30 UTC8h 20m
2026-06-29 CMP103 - Jun 29, 17:55 UTCJun 30, 02:40 UTC8h 45m
2026-06-29 CMP288 PTY → CUR Jun 29, 15:54 UTCJun 29, 16:10 UTC15m
2026-06-28 CMP347 - Jun 28, 21:55 UTCJun 29, 11:50 UTC13h 55m

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-9810CMP page for operator, model, and routing details .

Mode-S 0C21B8 frequently asked

What is Mode-S code 0C21B8?
0C21B8 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9810CMP.
Where is Mode-S 0C21B8 registered?
Mode-S code 0C21B8 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21B8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21B8, octal 03020670, decimal 795,064.
What flights does 0C21B8 operate?
Mode-S 0C21B8 has broadcast 20 distinct callsigns, including CMP734, CMP820, CMP253, CMP456, CMP205.