sensors Mode-S transponder

0C21B9

ICAO 24-bit transponder address · allocated to Suriname

Currently assigned to HP-9811CMP · BOEING 737 MAX 8

Hex
0C21B9
Octal
03020671
Decimal
795,065
Country
SR
Tail
HP-9811CMP
Type
B38M
No current signal · last broadcast 9h ago
Flights observed
223
Distinct callsigns
20
Country
SR
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 0C21B9.

Country allocation

The ICAO 24-bit address 0C21B9 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 - 14 2026-07-07
CMP734 - 14 2026-06-17
CMP820 - 11 2026-07-05
CMP421 Copa Airlines 8 2026-06-07
CMP477 - 5 2026-07-13
CMP420 - 5 2026-07-10
CMP293 Copa Airlines 5 2026-07-01
CMP891 Copa Airlines 4 2026-06-09
CMP752 - 4 2026-06-12
CMP732 Copa Airlines 4 2026-05-17
CMP263 Copa Airlines 4 2026-05-26
CMP253 Copa Airlines 4 2026-06-01
CMP205 - 4 2026-07-04
CMP880 Copa Airlines 3 2026-06-09
CMP723 Copa Airlines 3 2026-06-16
CMP721 - 3 2026-06-16
CMP708 Copa Airlines 3 2026-05-15
CMP705 Copa Airlines 3 2026-04-21
CMP479 Copa Airlines 3 2026-06-13
CMP476 - 3 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CMP406 - Jul 13, 20:20 UTCJul 14, 01:10 UTC4h 50m
2026-07-13 CMP405 - Jul 13, 18:05 UTCJul 13, 18:30 UTC25m
2026-07-13 CMP477 - Jul 13, 05:01 UTCJul 13, 13:15 UTC8h 15m
2026-07-12 CMP476 IAD → DEN Jul 12, 10:40 UTCJul 12, 23:35 UTC12h 55m
2026-07-12 CMP404 - Jul 12, 04:30 UTCJul 12, 08:01 UTC3h 30m
2026-07-12 CMP839 - Jul 12, 00:35 UTCJul 12, 00:45 UTC10m
2026-07-10 CMP420 - Jul 10, 23:20 UTCJul 11, 14:05 UTC14h 45m
2026-07-10 CMP420 - Jul 10, 16:55 UTCJul 11, 14:05 UTC21h 10m
2026-07-10 CMP264 - Jul 10, 08:10 UTCJul 10, 15:00 UTC6h 50m
2026-07-09 CMP868 - Jul 9, 19:40 UTCJul 10, 03:15 UTC7h 35m
2026-07-09 CMP867 PTY → MCO Jul 9, 11:35 UTCJul 9, 17:20 UTC5h 45m
2026-07-07 CMP821 - Jul 7, 22:25 UTCJul 8, 17:35 UTC19h 10m
2026-07-07 CMP821 - Jul 7, 21:30 UTCJul 8, 17:35 UTC20h 5m
2026-07-07 CMP821 - Jul 7, 16:25 UTCJul 8, 15:25 UTC23h 0m
2026-07-07 CMP821 - Jul 7, 14:10 UTCJul 8, 09:10 UTC19h 0m
2026-07-07 CMP821 - Jul 7, 08:20 UTCJul 8, 05:55 UTC21h 35m
2026-07-07 CMP821 - Jul 7, 08:10 UTCJul 8, 05:55 UTC21h 45m
2026-07-06 CMP420 - Jul 6, 23:30 UTCJul 7, 21:40 UTC22h 10m
2026-07-06 CMP420 - Jul 6, 17:50 UTCJul 7, 14:15 UTC20h 25m
2026-07-06 CMP857 - Jul 6, 08:25 UTCJul 6, 16:10 UTC7h 45m
2026-07-06 CMP858 - Jul 6, 05:55 UTCJul 6, 06:50 UTC55m
2026-07-05 CMP709 - Jul 5, 21:40 UTCJul 6, 05:20 UTC7h 40m
2026-07-05 CMP820 - Jul 5, 01:25 UTCJul 5, 18:55 UTC17h 30m
2026-07-04 CMP820 - Jul 4, 22:25 UTCJul 5, 18:55 UTC20h 30m
2026-07-04 CMP820 - Jul 4, 16:40 UTCJul 5, 15:30 UTC22h 50m
2026-07-04 CMP820 - Jul 4, 14:20 UTCJul 5, 09:15 UTC18h 55m
2026-07-04 CMP821 - Jul 4, 06:20 UTCJul 5, 06:10 UTC23h 50m
2026-07-04 CMP821 - Jul 4, 02:20 UTCJul 5, 02:15 UTC23h 55m
2026-07-04 CMP205 - Jul 4, 01:30 UTCJul 4, 23:00 UTC21h 30m
2026-07-03 CMP205 - Jul 3, 23:35 UTCJul 4, 16:45 UTC17h 10m
2026-07-03 CMP205 - Jul 3, 08:35 UTCJul 4, 06:50 UTC22h 15m
2026-07-03 CMP205 - Jul 3, 06:20 UTCJul 4, 06:15 UTC23h 55m
2026-07-03 CMP820 - Jul 3, 05:15 UTCJul 4, 02:20 UTC21h 5m
2026-07-03 CMP820 - Jul 3, 02:20 UTCJul 4, 02:15 UTC23h 55m
2026-07-03 CMP820 - Jul 3, 01:30 UTCJul 4, 00:05 UTC22h 35m
2026-07-02 CMP820 - Jul 2, 16:20 UTCJul 3, 09:25 UTC17h 5m
2026-07-01 CMP293 PTY → CUN Jul 1, 20:25 UTCJul 2, 14:45 UTC18h 20m
2026-07-01 CMP293 PTY → CUN Jul 1, 17:25 UTCJul 2, 14:45 UTC21h 20m
2026-07-01 CMP742 - Jul 1, 12:20 UTCJul 1, 20:55 UTC8h 35m
2026-06-30 CMP868 - Jun 30, 21:50 UTCJul 1, 05:45 UTC7h 55m
2026-06-30 CMP403 IAD → MCO Jun 30, 06:35 UTCJun 30, 17:25 UTC10h 50m
2026-06-29 CMP448 - Jun 29, 18:10 UTCJun 30, 04:15 UTC10h 6m
2026-06-28 CMP106 PTY → MGA Jun 28, 23:04 UTCJun 29, 20:35 UTC21h 30m
2026-06-28 CMP128 - Jun 28, 19:44 UTCJun 28, 19:55 UTC10m
2026-06-26 CMP262 CUN → PTY Jun 26, 16:20 UTCJun 26, 17:50 UTC1h 30m
2026-06-25 CMP293 PTY → CUN Jun 25, 23:49 UTCJun 26, 14:50 UTC15h 0m
2026-06-25 CMP293 PTY → CUN Jun 25, 18:19 UTCJun 26, 14:50 UTC20h 30m
2026-06-25 CMP293 PTY → CUN Jun 25, 17:20 UTCJun 26, 14:50 UTC21h 30m
2026-06-24 CMP122 PTY → CUN Jun 24, 20:20 UTCJun 25, 15:50 UTC19h 30m
2026-06-24 CMP122 PTY → CUN Jun 24, 19:24 UTCJun 25, 15:50 UTC20h 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-9811CMP page for operator, model, and routing details .

Mode-S 0C21B9 frequently asked

What is Mode-S code 0C21B9?
0C21B9 is an ICAO 24-bit transponder address. Allocated to Suriname. Assigned to HP-9811CMP.
Where is Mode-S 0C21B9 registered?
Mode-S code 0C21B9 is allocated to Suriname (SR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0C21B9 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0C21B9, octal 03020671, decimal 795,065.
What flights does 0C21B9 operate?
Mode-S 0C21B9 has broadcast 20 distinct callsigns, including CMP821, CMP734, CMP820, CMP421, CMP477.