Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

0C21F9

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9817CMP · BOEING 737 MAX 8

Hex
0C21F9
Octal
03020771
Decimal
795,129
Country
SR
Tail
HP-9817CMP
Type
B38M
Broadcasting now · callsign CMP264 · 36,000 ft
Flights observed
194
Distinct callsigns
20
Country
SR
Last broadcast
2h ago

Current position

0C21F9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 0C21F9 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
CMP821 - 12 2026-07-11
CMP734 - 8 2026-06-26
CMP867 Copa Airlines 7 2026-06-23
CMP820 - 7 2026-07-12
CMP752 Copa Airlines 7 2026-06-03
CMP421 Copa Airlines 6 2026-06-05
CMP868 Copa Airlines 5 2026-06-24
CMP456 - 5 2026-06-27
CMP420 Copa Airlines 5 2026-05-27
CMP229 - 5 2026-07-10
CMP132 - 5 2026-07-09
CMP760 Copa Airlines 4 2026-06-16
CMP708 Copa Airlines 4 2026-06-07
CMP450 - 4 2026-07-05
CMP253 - 4 2026-06-28
CMP228 - 4 2026-07-10
CMP765 Copa Airlines 3 2026-05-08
CMP761 Copa Airlines 3 2026-04-28
CMP709 Copa Airlines 3 2026-06-07
CMP478 - 3 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CMP266 - Jul 13, 22:30 UTCJul 14, 06:05 UTC7h 35m
2026-07-13 CMP763 SJO → FLL Jul 13, 14:25 UTCJul 13, 19:50 UTC5h 25m
2026-07-12 CMP732 - Jul 12, 22:40 UTCJul 13, 13:10 UTC14h 30m
2026-07-12 CMP732 - Jul 12, 08:45 UTCJul 13, 08:15 UTC23h 30m
2026-07-12 CMP820 - Jul 12, 05:10 UTCJul 13, 00:45 UTC19h 35m
2026-07-11 CMP821 - Jul 11, 15:30 UTCJul 12, 09:30 UTC18h 0m
2026-07-11 CMP821 - Jul 11, 12:20 UTCJul 12, 09:30 UTC21h 10m
2026-07-11 CMP821 - Jul 11, 12:00 UTCJul 12, 09:30 UTC21h 30m
2026-07-11 CMP821 - Jul 11, 08:20 UTCJul 12, 06:10 UTC21h 50m
2026-07-11 CMP821 - Jul 11, 07:05 UTCJul 12, 06:10 UTC23h 5m
2026-07-11 CMP821 - Jul 11, 05:05 UTCJul 12, 02:05 UTC21h 0m
2026-07-11 CMP821 - Jul 11, 03:55 UTCJul 12, 02:05 UTC22h 10m
2026-07-11 CMP625 - Jul 11, 00:25 UTCJul 11, 23:05 UTC22h 40m
2026-07-10 CMP229 - Jul 10, 22:20 UTCJul 11, 21:40 UTC23h 20m
2026-07-10 CMP229 - Jul 10, 20:45 UTCJul 11, 16:15 UTC19h 30m
2026-07-10 CMP228 - Jul 10, 08:10 UTCJul 10, 18:40 UTC10h 30m
2026-07-09 CMP132 - Jul 9, 22:05 UTCJul 10, 05:25 UTC7h 20m
2026-07-09 CMP462 LIM → PTY Jul 9, 12:20 UTCJul 9, 20:10 UTC7h 50m
2026-07-08 CMP769 BOG → PTY Jul 8, 05:15 UTCJul 9, 00:00 UTC18h 45m
2026-07-07 CMP229 - Jul 7, 20:40 UTCJul 8, 13:50 UTC17h 10m
2026-07-07 CMP228 - Jul 7, 14:00 UTCJul 7, 18:15 UTC4h 15m
2026-07-05 CMP126 - Jul 5, 23:55 UTCJul 6, 07:50 UTC7h 55m
2026-07-05 CMP451 - Jul 5, 10:00 UTCJul 5, 10:10 UTC10m
2026-07-05 CMP450 - Jul 5, 01:55 UTCJul 5, 02:05 UTC10m
2026-07-04 CMP871 - Jul 4, 20:45 UTCJul 4, 21:35 UTC50m
2026-07-04 CMP816 - Jul 4, 18:45 UTCJul 4, 18:55 UTC10m
2026-07-04 CMP101 - Jul 4, 10:40 UTCJul 4, 18:05 UTC7h 25m
2026-07-04 CMP404 - Jul 4, 04:35 UTCJul 4, 08:05 UTC3h 30m
2026-07-03 CMP315 - Jul 3, 08:05 UTCJul 3, 09:15 UTC1h 10m
2026-07-02 CMP132 LIM → PTY Jul 2, 22:20 UTCJul 3, 05:15 UTC6h 55m
2026-07-02 CMP131 PTY → LIM Jul 2, 19:25 UTCJul 2, 20:10 UTC45m
2026-07-01 CMP333 - Jul 1, 22:15 UTCJul 2, 00:05 UTC1h 50m
2026-07-01 CMP459 - Jul 1, 05:30 UTCJul 1, 18:20 UTC12h 50m
2026-06-30 CMP862 - Jun 30, 22:05 UTCJun 30, 23:15 UTC1h 10m
2026-06-30 CMP862 JFK → MIA Jun 30, 08:00 UTCJun 30, 19:40 UTC11h 40m
2026-06-29 CMP731 IAD → JFK Jun 29, 10:29 UTCJun 30, 05:20 UTC18h 51m
2026-06-28 CMP891 ATL → IAD Jun 28, 21:30 UTCJun 29, 07:59 UTC10h 30m
2026-06-28 CMP253 LAS → ATL Jun 28, 07:44 UTCJun 28, 19:29 UTC11h 45m
2026-06-27 CMP456 - Jun 27, 23:39 UTCJun 28, 05:09 UTC5h 30m
2026-06-26 CMP734 - Jun 26, 00:55 UTCJun 26, 17:00 UTC16h 5m
2026-06-25 CMP734 - Jun 25, 18:19 UTCJun 26, 17:00 UTC22h 40m
2026-06-25 CMP440 MIA → PTY Jun 25, 16:35 UTCJun 26, 09:05 UTC16h 30m
2026-06-24 CMP868 MCO → PTY Jun 24, 20:35 UTCJun 25, 05:29 UTC8h 55m
2026-06-23 CMP867 PTY → MCO Jun 23, 22:44 UTCJun 24, 17:34 UTC18h 50m
2026-06-22 CMP445 MCO → GUA Jun 22, 22:19 UTCJun 23, 15:09 UTC16h 50m
2026-06-22 CMP478 - Jun 22, 18:04 UTCJun 22, 20:24 UTC2h 20m
2026-06-22 CMP478 - Jun 22, 01:05 UTCJun 22, 20:24 UTC19h 20m
2026-06-21 CMP478 - Jun 21, 22:20 UTCJun 22, 20:24 UTC22h 5m
2026-06-21 CMP705 - Jun 21, 20:59 UTCJun 22, 20:14 UTC23h 15m
2026-06-21 CMP704 PTY → BOS Jun 21, 01:30 UTCJun 21, 18:20 UTC16h 50m

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-9817CMP page for operator, model, and routing details .

Mode-S 0C21F9 frequently asked

What is Mode-S code 0C21F9?
0C21F9 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9817CMP.
Where is Mode-S 0C21F9 registered?
Mode-S code 0C21F9 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21F9 broadcasting right now?
Yes. Mode-S 0C21F9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21F9, octal 03020771, decimal 795,129.
What flights does 0C21F9 operate?
Mode-S 0C21F9 has broadcast 20 distinct callsigns, including CMP821, CMP734, CMP867, CMP820, CMP752.