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 2h ago
Flights observed
211
Distinct callsigns
20
Country
SR
Last broadcast
2h ago

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
CMP820 - 16 2026-07-02
CMP734 - 16 2026-07-11
CMP253 Copa Airlines 14 2026-05-29
CMP456 Copa Airlines 13 2026-05-28
CMP476 - 9 2026-07-13
CMP752 Copa Airlines 8 2026-06-06
CMP205 Copa Airlines 8 2026-06-06
CMP821 - 7 2026-06-19
CMP753 Copa Airlines 6 2026-05-30
CMP423 Copa Airlines 6 2026-06-07
CMP477 Copa Airlines 5 2026-05-28
CMP478 - 4 2026-06-30
CMP228 Copa Airlines 4 2026-06-21
CMP721 Copa Airlines 3 2026-05-25
CMP496 Copa Airlines 3 2026-05-26
CMP333 Copa Airlines 3 2026-05-17
CMP252 Copa Airlines 3 2026-04-20
CMP195 Copa Airlines 3 2026-05-11
CMP194 Copa Airlines 3 2026-05-10
CMP149 Copa Airlines 3 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-06-28 CMP324 - Jun 28, 18:34 UTCJun 28, 20:14 UTC1h 40m
2026-06-26 CMP613 - Jun 26, 03:50 UTCJun 26, 08:05 UTC4h 15m
2026-06-26 CMP609 - Jun 26, 00:50 UTCJun 26, 02:05 UTC1h 15m
2026-06-25 CMP609 - Jun 25, 04:29 UTCJun 25, 21:55 UTC17h 25m
2026-06-22 CMP857 - Jun 22, 08:35 UTCJun 22, 11:04 UTC2h 30m
2026-06-21 CMP229 ORD → MEX Jun 21, 20:45 UTCJun 22, 06:49 UTC10h 5m
2026-06-21 CMP228 PTY → ORD Jun 21, 14:15 UTCJun 21, 18:50 UTC4h 35m
2026-06-20 CMP228 PTY → ORD Jun 20, 18:04 UTCJun 21, 18:00 UTC23h 55m
2026-06-20 CMP228 PTY → ORD Jun 20, 17:54 UTCJun 21, 15:59 UTC22h 5m
2026-06-20 CMP820 - Jun 20, 05:24 UTCJun 20, 22:05 UTC16h 40m
2026-06-20 CMP820 - Jun 20, 02:04 UTCJun 20, 22:05 UTC20h 0m
2026-06-19 CMP820 - Jun 19, 22:45 UTCJun 20, 17:59 UTC19h 15m
2026-06-19 CMP820 - Jun 19, 10:04 UTCJun 20, 09:39 UTC23h 35m
2026-06-19 CMP821 - Jun 19, 08:29 UTCJun 20, 05:59 UTC21h 30m
2026-06-18 CMP229 - Jun 18, 20:50 UTCJun 19, 06:44 UTC9h 54m
2026-06-18 CMP228 PTY → ORD Jun 18, 08:25 UTCJun 18, 18:20 UTC9h 55m
2026-06-17 CMP858 MCO → MEX Jun 17, 17:55 UTCJun 18, 06:35 UTC12h 40m
2026-06-16 CMP821 - Jun 16, 21:20 UTCJun 17, 15:50 UTC18h 30m
2026-06-16 CMP821 - Jun 16, 17:10 UTCJun 17, 15:50 UTC22h 41m
2026-06-16 CMP463 PTY → COR Jun 16, 15:09 UTCJun 16, 15:20 UTC10m
2026-06-15 CMP244 BOG → PTY Jun 15, 19:50 UTCJun 15, 20:00 UTC10m
2026-06-15 CMP415 PTY → BOG Jun 15, 18:15 UTCJun 15, 18:25 UTC10m
2026-06-14 CMP295 - Jun 14, 19:55 UTCJun 14, 23:05 UTC3h 10m
2026-06-14 CMP201 DEN → YYZ Jun 14, 04:50 UTCJun 14, 18:10 UTC13h 20m
2026-06-13 CMP476 - Jun 13, 11:30 UTCJun 13, 23:45 UTC12h 15m
2026-06-13 CMP396 SCL → PTY Jun 13, 08:25 UTCJun 13, 08:35 UTC10m
2026-06-13 CMP474 PTY → SCL Jun 13, 03:00 UTCJun 13, 03:50 UTC50m
2026-06-11 CMP445 MCO → PTY Jun 11, 22:15 UTCJun 11, 23:00 UTC45m

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 2h ago.
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 CMP820, CMP734, CMP253, CMP456, CMP476.