Apparatus

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sensors Mode-S transponder

0C21A4

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9802CMP · BOEING 737 MAX 8

Hex
0C21A4
Octal
03020644
Decimal
795,044
Country
SR
Tail
HP-9802CMP
Type
B38M
No current signal · last broadcast 1d ago
Flights observed
197
Distinct callsigns
20
Country
SR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 0C21A4.

Country allocation

The ICAO 24-bit address 0C21A4 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 - 13 2026-06-14
CMP734 - 12 2026-06-24
CMP821 Copa Airlines 9 2026-06-13
CMP420 Copa Airlines 7 2026-06-02
CMP476 - 6 2026-07-11
CMP868 Copa Airlines 5 2026-05-14
CMP769 Copa Airlines 5 2026-06-11
CMP477 - 4 2026-07-12
CMP451 - 4 2026-07-10
CMP262 Copa Airlines 4 2026-04-23
CMP9802 - 3 2026-04-17
CMP867 Copa Airlines 3 2026-05-10
CMP765 Copa Airlines 3 2026-04-21
CMP752 - 3 2026-06-24
CMP709 - 3 2026-07-10
CMP708 - 3 2026-07-10
CMP6484 - 3 2026-04-17
CMP450 - 3 2026-07-10
CMP297 Copa Airlines 3 2026-06-06
CMP194 - 3 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CMP128 - Jul 13, 20:15 UTCJul 13, 20:25 UTC10m
2026-07-12 CMP464 - Jul 12, 23:05 UTCJul 13, 20:25 UTC21h 20m
2026-07-12 CMP763 - Jul 12, 14:20 UTCJul 12, 14:35 UTC15m
2026-07-12 CMP787 - Jul 12, 12:40 UTCJul 12, 13:01 UTC20m
2026-07-12 CMP477 - Jul 12, 05:05 UTCJul 12, 09:35 UTC4h 30m
2026-07-11 CMP476 BOG → DEN Jul 11, 15:05 UTCJul 11, 23:35 UTC8h 30m
2026-07-10 CMP709 - Jul 10, 20:55 UTCJul 11, 05:20 UTC8h 25m
2026-07-10 CMP708 - Jul 10, 15:35 UTCJul 10, 19:10 UTC3h 35m
2026-07-10 CMP451 - Jul 10, 09:35 UTCJul 10, 09:45 UTC10m
2026-07-10 CMP450 - Jul 10, 02:10 UTCJul 10, 02:20 UTC10m
2026-07-09 CMP195 - Jul 9, 12:20 UTCJul 9, 14:50 UTC2h 30m
2026-07-08 CMP194 - Jul 8, 20:30 UTCJul 9, 06:05 UTC9h 35m
2026-07-08 CMP466 PTY → RDU Jul 8, 11:10 UTCJul 8, 18:05 UTC6h 55m
2026-07-07 CMP477 - Jul 7, 05:00 UTCJul 7, 09:40 UTC4h 40m
2026-07-06 CMP476 - Jul 6, 14:20 UTCJul 7, 00:05 UTC9h 45m
2026-07-06 CMP476 - Jul 6, 01:35 UTCJul 7, 00:05 UTC22h 30m
2026-07-05 CMP476 - Jul 5, 21:05 UTCJul 6, 20:35 UTC23h 30m
2026-07-05 CMP884 - Jul 5, 20:45 UTCJul 6, 18:55 UTC22h 10m
2026-07-05 CMP286 PTY → SAP Jul 5, 17:30 UTCJul 6, 14:45 UTC21h 15m
2026-07-05 CMP286 PTY → SAP Jul 5, 13:05 UTCJul 6, 01:45 UTC12h 40m
2026-07-04 CMP897 - Jul 4, 08:15 UTCJul 4, 12:40 UTC4h 25m
2026-07-03 CMP899 - Jul 3, 18:30 UTCJul 4, 06:35 UTC12h 5m
2026-07-02 CMP474 - Jul 2, 20:25 UTCJul 3, 03:40 UTC7h 15m
2026-07-02 CMP737 - Jul 2, 10:20 UTCJul 2, 18:45 UTC8h 25m
2026-07-02 CMP804 - Jul 2, 01:00 UTCJul 2, 04:45 UTC3h 45m
2026-06-30 CMP471 YYZ → PTY Jun 30, 12:25 UTCJun 30, 23:10 UTC10h 45m
2026-06-29 CMP470 - Jun 29, 09:05 UTCJun 30, 04:55 UTC19h 51m
2026-06-29 CMP253 LAS → YYZ Jun 29, 07:50 UTCJun 30, 04:55 UTC21h 6m
2026-06-28 CMP456 - Jun 28, 23:39 UTCJun 29, 05:09 UTC5h 30m
2026-06-27 CMP229 - Jun 27, 20:49 UTCJun 28, 00:59 UTC4h 10m
2026-06-27 CMP228 - Jun 27, 07:49 UTCJun 27, 18:39 UTC10h 50m
2026-06-26 CMP807 - Jun 26, 06:29 UTCJun 27, 01:09 UTC18h 40m
2026-06-25 CMP819 PTY → JFK Jun 25, 01:35 UTCJun 25, 20:09 UTC18h 35m
2026-06-24 CMP752 - Jun 24, 17:34 UTCJun 25, 16:29 UTC22h 55m
2026-06-24 CMP752 - Jun 24, 15:05 UTCJun 25, 06:44 UTC15h 40m
2026-06-24 CMP752 - Jun 24, 06:20 UTCJun 25, 02:49 UTC20h 30m
2026-06-24 CMP734 - Jun 24, 01:14 UTCJun 24, 17:40 UTC16h 25m
2026-06-23 CMP734 - Jun 23, 10:49 UTCJun 24, 06:59 UTC20h 10m
2026-06-23 CMP451 - Jun 23, 09:49 UTCJun 23, 09:59 UTC10m
2026-06-23 CMP450 - Jun 23, 02:09 UTCJun 23, 02:29 UTC20m
2026-06-22 CMP320 COR → PTY Jun 22, 13:35 UTCJun 23, 01:15 UTC11h 40m
2026-06-22 CMP320 COR → PTY Jun 22, 05:04 UTCJun 23, 01:15 UTC20h 10m
2026-06-22 CMP354 CUN → PTY Jun 22, 04:30 UTCJun 23, 01:15 UTC20h 45m
2026-06-21 CMP326 CUN → PTY Jun 21, 19:09 UTCJun 22, 14:10 UTC19h 0m
2026-06-21 CMP253 - Jun 21, 07:49 UTCJun 21, 16:59 UTC9h 10m
2026-06-20 CMP456 - Jun 20, 19:19 UTCJun 21, 05:15 UTC9h 55m
2026-06-20 CMP358 - Jun 20, 10:09 UTCJun 20, 17:34 UTC7h 25m
2026-06-19 CMP149 - Jun 19, 07:34 UTCJun 20, 02:29 UTC18h 55m
2026-06-18 CMP138 - Jun 18, 17:50 UTCJun 19, 01:15 UTC7h 24m
2026-06-18 CMP140 - Jun 18, 03:50 UTCJun 18, 14:05 UTC10h 15m

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-9802CMP page for operator, model, and routing details .

Mode-S 0C21A4 frequently asked

What is Mode-S code 0C21A4?
0C21A4 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9802CMP.
Where is Mode-S 0C21A4 registered?
Mode-S code 0C21A4 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21A4 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21A4, octal 03020644, decimal 795,044.
What flights does 0C21A4 operate?
Mode-S 0C21A4 has broadcast 20 distinct callsigns, including CMP820, CMP734, CMP821, CMP420, CMP476.