Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

49D253

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-OBR · CESSNA 510 Citation Mustang

Hex
49D253
Octal
22351123
Decimal
4,837,971
Country
CZ
Tail
OK-OBR
Type
C510
No current signal · last broadcast 1d ago
Flights observed
91
Distinct callsigns
20
Country
CZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 49D253.

Country allocation

The ICAO 24-bit address 49D253 falls within the block assigned to Czech Republic (CZ) by ICAO Annex 10, Volume III. Every aircraft registered in Czech Republic 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
DFC8DA - 6 2026-04-30
DFC59A - 6 2026-07-03
DFC33Y - 6 2026-04-15
DFC6YL - 5 2026-07-05
DFC7GE - 4 2026-06-13
DFC5CF - 4 2026-04-23
DFC3BD - 4 2026-07-06
DFC37X - 4 2026-07-12
DFC8BG - 3 2026-04-17
DFC5BB - 3 2026-07-16
DFC38T - 3 2026-06-30
DFC38C - 3 2026-06-08
DFC19C - 3 2026-07-01
DFC77Y - 2 2026-05-05
DFC6GM - 2 2026-06-02
DFC69L - 2 2026-06-21
DFC62B - 2 2026-04-22
DFC55S - 2 2026-05-09
DFC52P - 2 2026-07-05
DFC48Z - 2 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 DFC5BB BTS → PRG Jul 16, 10:25 UTCJul 16, 11:15 UTC50m
2026-07-16 DFC5BB - Jul 16, 08:55 UTCJul 16, 09:50 UTC55m
2026-07-16 DFC5BB - Jul 16, 06:05 UTCJul 16, 07:10 UTC1h 5m
2026-07-13 DFC48Z VIE → PRG Jul 13, 13:40 UTCJul 13, 14:20 UTC40m
2026-07-13 DFC48Z PRG → VIE Jul 13, 06:35 UTCJul 13, 07:15 UTC40m
2026-07-12 DFC37X - Jul 12, 06:35 UTCJul 12, 08:15 UTC1h 40m
2026-07-12 DFC37X ORY → ORY Jul 12, 06:15 UTCJul 12, 06:20 UTC5m
2026-07-12 DFC37X - Jul 12, 03:30 UTCJul 12, 05:30 UTC2h 0m
2026-07-12 DFC37X PRG → PRG Jul 12, 03:10 UTCJul 12, 03:15 UTC5m
2026-07-10 DFC11D - Jul 10, 11:05 UTCJul 10, 12:25 UTC1h 20m
2026-07-10 DFC11D PRG → AMS Jul 10, 07:30 UTCJul 10, 09:05 UTC1h 35m
2026-07-08 DFC3KH - Jul 8, 14:10 UTCJul 8, 15:40 UTC1h 30m
2026-07-08 DFC3KH - Jul 8, 05:15 UTCJul 8, 06:35 UTC1h 20m
2026-07-07 DFC2KF BTS → PRG Jul 7, 15:30 UTCJul 7, 16:15 UTC45m
2026-07-07 DFC2KF PRG → BTS Jul 7, 08:35 UTCJul 7, 09:20 UTC45m
2026-07-06 DFC3BD - Jul 6, 00:50 UTCJul 6, 01:25 UTC35m
2026-07-06 DFC3BD - Jul 6, 00:30 UTCJul 6, 00:40 UTC10m
2026-07-05 DFC3BD - Jul 5, 21:45 UTCJul 5, 23:55 UTC2h 10m
2026-07-05 DFC3BD PRG → LTN Jul 5, 18:20 UTCJul 5, 20:40 UTC2h 20m
2026-07-05 DFC52P - Jul 5, 16:10 UTCJul 5, 17:20 UTC1h 10m
2026-07-05 DFC6YL - Jul 5, 14:40 UTCJul 5, 15:00 UTC20m
2026-07-05 DFC6YL - Jul 5, 12:30 UTCJul 5, 13:15 UTC45m
2026-07-05 DFC6YL KEL → KEL Jul 5, 12:15 UTCJul 5, 12:20 UTC5m
2026-07-04 DFC6YL - Jul 4, 11:20 UTCJul 4, 13:50 UTC2h 30m
2026-07-04 DFC6YL - Jul 4, 08:40 UTCJul 4, 10:25 UTC1h 45m
2026-07-04 DFC52P PRG → ENS Jul 4, 06:35 UTCJul 4, 08:00 UTC1h 25m
2026-07-03 DFC59A - Jul 3, 09:00 UTCJul 3, 09:40 UTC40m
2026-07-03 DFC59A POZ → POZ Jul 3, 08:35 UTCJul 3, 08:45 UTC10m
2026-07-03 DFC59A HAM → POZ Jul 3, 07:15 UTCJul 3, 08:10 UTC55m
2026-07-02 DFC59A - Jul 2, 14:05 UTCJul 2, 15:15 UTC1h 10m
2026-07-02 DFC59A POZ → POZ Jul 2, 13:45 UTCJul 2, 13:55 UTC10m
2026-07-02 DFC59A PRG → POZ Jul 2, 12:20 UTCJul 2, 13:05 UTC45m
2026-07-01 DFC19C - Jul 1, 11:50 UTCJul 1, 13:15 UTC1h 25m
2026-07-01 DFC19C BRU → BRU Jul 1, 11:25 UTCJul 1, 11:30 UTC5m
2026-07-01 DFC19C - Jul 1, 05:55 UTCJul 1, 07:20 UTC1h 25m
2026-06-30 DFC38T CGN → PRG Jun 30, 09:15 UTCJun 30, 10:25 UTC1h 10m
2026-06-29 DFC38T - Jun 29, 19:54 UTCJun 29, 21:54 UTC2h 0m
2026-06-29 DFC38T PRG → WAW Jun 29, 17:34 UTCJun 29, 18:39 UTC1h 5m
2026-06-29 DFC2CH - Jun 29, 14:29 UTCJun 29, 15:45 UTC1h 15m
2026-06-29 DFC2CH - Jun 29, 06:59 UTCJun 29, 08:04 UTC1h 5m
2026-06-24 DFC1EE - Jun 24, 07:50 UTCJun 24, 08:30 UTC40m
2026-06-24 DFC1EE - Jun 24, 06:04 UTCJun 24, 06:39 UTC35m
2026-06-21 DFC69L RZE → PRG Jun 21, 18:10 UTCJun 21, 19:14 UTC1h 5m
2026-06-21 DFC69L - Jun 21, 16:10 UTCJun 21, 17:24 UTC1h 15m
2026-06-14 DFC1CD - Jun 14, 15:55 UTCJun 14, 16:35 UTC40m
2026-06-13 DFC1CD - Jun 13, 15:10 UTCJun 13, 15:40 UTC30m
2026-06-13 DFC7GE - Jun 13, 13:40 UTCJun 13, 14:50 UTC1h 10m
2026-06-10 DFC7GE - Jun 10, 07:25 UTCJun 10, 08:50 UTC1h 25m
2026-06-10 DFC7GE - Jun 10, 06:45 UTCJun 10, 07:00 UTC15m
2026-06-10 DFC7GE PRG → PRG Jun 10, 06:30 UTCJun 10, 06:35 UTC5m

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 OK-OBR page for operator, model, and routing details .

Mode-S 49D253 frequently asked

What is Mode-S code 49D253?
49D253 is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-OBR.
Where is Mode-S 49D253 registered?
Mode-S code 49D253 is allocated to Czech Republic (CZ). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 49D253 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 49D253, octal 22351123, decimal 4,837,971.
What flights does 49D253 operate?
Mode-S 49D253 has broadcast 20 distinct callsigns, including DFC8DA, DFC59A, DFC33Y, DFC6YL, DFC7GE.