sensors Mode-S transponder

0C21A8

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9806CMP · BOEING 737 MAX 8

Hex
0C21A8
Octal
03020650
Decimal
795,048
Country
SR
Tail
HP-9806CMP
Type
B38M
Broadcasting now · callsign CMP423 · 35,000 ft
Flights observed
245
Distinct callsigns
20
Country
SR
Last broadcast
Jul 26, 22:00 UTC

Current position

0C21A8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 0C21A8 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 - 20 2026-07-05
CMP734 - 17 2026-07-16
CMP821 - 16 2026-07-19
CMP420 Copa Airlines 9 2026-05-31
CMP477 Copa Airlines 6 2026-07-23
CMP476 Copa Airlines 6 2026-07-26
CMP424 - 6 2026-07-13
CMP423 - 6 2026-07-12
CMP421 - 6 2026-07-14
CMP456 - 5 2026-07-03
CMP253 - 5 2026-07-04
CMP127 Copa Airlines 5 2026-07-25
CMP470 - 4 2026-07-04
CMP228 - 4 2026-06-28
CMP194 Copa Airlines 4 2026-07-23
CMP122 Copa Airlines 4 2026-05-12
CMP862 Copa Airlines 3 2026-05-11
CMP496 - 3 2026-06-18
CMP484 Copa Airlines 3 2026-06-26
CMP471 Copa Airlines 3 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CMP476 PTY → DEN Jul 26, 14:25 UTCJul 26, 22:00 UTC7h 35m
2026-07-25 CMP127 PTY → VVI Jul 25, 18:05 UTCJul 26, 13:00 UTC18h 56m
2026-07-25 CMP127 PTY → VVI Jul 25, 17:35 UTCJul 26, 13:00 UTC19h 26m
2026-07-25 CMP127 PTY → VVI Jul 25, 06:35 UTCJul 26, 00:45 UTC18h 10m
2026-07-25 CMP127 PTY → VVI Jul 25, 05:10 UTCJul 26, 00:45 UTC19h 35m
2026-07-25 CMP127 PTY → VVI Jul 25, 02:05 UTCJul 26, 00:45 UTC22h 40m
2026-07-25 CMP221 PTY → CCS Jul 25, 01:25 UTCJul 26, 00:00 UTC22h 35m
2026-07-24 CMP445 MCO → PTY Jul 24, 22:35 UTCJul 25, 19:25 UTC20h 50m
2026-07-24 CMP478 MEX → MCO Jul 24, 12:15 UTCJul 24, 20:35 UTC8h 20m
2026-07-23 CMP194 PTY → MEX Jul 23, 22:40 UTCJul 24, 06:10 UTC7h 30m
2026-07-23 CMP477 DEN → PTY Jul 23, 05:30 UTCJul 23, 14:40 UTC9h 10m
2026-07-22 CMP476 PTY → DEN Jul 22, 11:15 UTCJul 23, 00:20 UTC13h 5m
2026-07-21 CMP440 MIA → PTY Jul 21, 16:35 UTCJul 22, 05:20 UTC12h 45m
2026-07-20 CMP467 RDU → PTY Jul 20, 21:20 UTCJul 21, 05:40 UTC8h 19m
2026-07-20 CMP466 PTY → RDU Jul 20, 01:20 UTCJul 20, 18:20 UTC17h 0m
2026-07-19 CMP466 PTY → RDU Jul 19, 22:30 UTCJul 20, 18:20 UTC19h 50m
2026-07-19 CMP821 - Jul 19, 21:15 UTCJul 20, 18:20 UTC21h 5m
2026-07-19 CMP821 - Jul 19, 16:20 UTCJul 20, 15:05 UTC22h 45m
2026-07-19 CMP477 DEN → PTY Jul 19, 05:10 UTCJul 19, 14:40 UTC9h 30m
2026-07-18 CMP476 PTY → DEN Jul 18, 18:40 UTCJul 18, 23:30 UTC4h 50m
2026-07-18 CMP163 - Jul 18, 01:30 UTCJul 18, 01:39 UTC10m
2026-07-17 CMP451 - Jul 17, 09:45 UTCJul 17, 09:55 UTC10m
2026-07-17 CMP450 PTY → SJU Jul 17, 02:20 UTCJul 17, 02:30 UTC10m
2026-07-16 CMP734 - Jul 16, 06:15 UTCJul 17, 01:45 UTC19h 30m
2026-07-16 CMP734 - Jul 16, 00:50 UTCJul 16, 19:50 UTC19h 0m
2026-07-15 CMP734 - Jul 15, 21:30 UTCJul 16, 19:50 UTC22h 20m
2026-07-15 CMP734 - Jul 15, 18:05 UTCJul 16, 16:44 UTC22h 40m
2026-07-15 CMP262 - Jul 15, 16:35 UTCJul 16, 16:00 UTC23h 25m
2026-07-15 CMP293 PTY → CUN Jul 15, 08:00 UTCJul 15, 14:35 UTC6h 35m
2026-07-15 CMP314 - Jul 15, 04:45 UTCJul 15, 05:10 UTC25m
2026-07-14 CMP421 - Jul 14, 08:05 UTCJul 15, 05:10 UTC21h 4m
2026-07-14 CMP421 - Jul 14, 07:40 UTCJul 15, 05:10 UTC21h 29m
2026-07-13 CMP421 - Jul 13, 15:05 UTCJul 14, 08:35 UTC17h 30m
2026-07-13 CMP421 - Jul 13, 10:30 UTCJul 14, 08:35 UTC22h 5m
2026-07-13 CMP424 - Jul 13, 09:10 UTCJul 14, 08:00 UTC22h 50m
2026-07-13 CMP424 - Jul 13, 06:35 UTCJul 13, 23:50 UTC17h 15m
2026-07-13 CMP424 - Jul 13, 04:40 UTCJul 13, 05:05 UTC25m
2026-07-12 CMP423 - Jul 12, 09:40 UTCJul 13, 03:10 UTC17h 30m
2026-07-12 CMP423 - Jul 12, 05:40 UTCJul 13, 03:10 UTC21h 30m
2026-07-12 CMP423 - Jul 12, 00:05 UTCJul 12, 23:20 UTC23h 15m
2026-07-11 CMP423 - Jul 11, 23:55 UTCJul 12, 22:00 UTC22h 5m
2026-07-11 CMP465 SJO → SJO Jul 11, 11:45 UTCJul 11, 22:45 UTC11h 0m
2026-07-10 CMP705 - Jul 10, 21:15 UTCJul 11, 04:30 UTC7h 15m
2026-07-10 CMP704 PTY → BOS Jul 10, 04:30 UTCJul 10, 18:15 UTC13h 45m
2026-07-09 CMP882 - Jul 9, 17:15 UTCJul 10, 02:50 UTC9h 35m
2026-07-09 CMP463 PTY → COR Jul 9, 15:10 UTCJul 9, 15:20 UTC10m
2026-07-08 CMP821 - Jul 8, 17:15 UTCJul 9, 09:25 UTC16h 10m
2026-07-08 CMP821 - Jul 8, 09:00 UTCJul 9, 06:05 UTC21h 5m
2026-07-08 CMP821 - Jul 8, 06:10 UTCJul 9, 06:00 UTC23h 50m
2026-07-08 CMP734 - Jul 8, 00:55 UTCJul 8, 17:20 UTC16h 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-9806CMP page for operator, model, and routing details .

Mode-S 0C21A8 frequently asked

What is Mode-S code 0C21A8?
0C21A8 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9806CMP.
Where is Mode-S 0C21A8 registered?
Mode-S code 0C21A8 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21A8 broadcasting right now?
Yes. Mode-S 0C21A8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21A8, octal 03020650, decimal 795,048.
What flights does 0C21A8 operate?
Mode-S 0C21A8 has broadcast 20 distinct callsigns, including CMP820, CMP734, CMP821, CMP420, CMP477.