Apparatus

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sensors Mode-S transponder

4B990D

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-FHM · AIRBUS A-320

Hex
4B990D
Octal
22714415
Decimal
4,954,381
Country
TR
Tail
TC-FHM
Type
A320
Broadcasting now · callsign FHY770 · 4,150 ft
Flights observed
271
Distinct callsigns
20
Country
TR
Last broadcast
Jul 26, 21:15 UTC

Current position

4B990D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B990D falls within the block assigned to Turkey (TR) by ICAO Annex 10, Volume III. Every aircraft registered in Turkey 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
FHY727 Freebird Airlines 12 2026-07-25
FHY728 Freebird Airlines 11 2026-07-26
FHY754 - 9 2026-07-21
FHY753 - 9 2026-07-21
FHY1548 - 8 2026-07-25
FHY1905 - 7 2026-04-16
FHY1897 - 7 2026-07-14
FHY1551 - 7 2026-07-25
FHY1547 - 7 2026-07-25
FHY1552 - 6 2026-07-25
FHY770 - 5 2026-07-17
FHY769 - 5 2026-07-16
FHY1898 - 5 2026-07-15
FHY1362 Freebird Airlines 5 2026-07-24
FHY1361 Freebird Airlines 5 2026-07-24
FHY744 Freebird Airlines 4 2026-06-11
FHY743 - 4 2026-06-10
FHY1372 Freebird Airlines 4 2026-07-20
FHY1366 Freebird Airlines 4 2026-07-24
FHY1365 Freebird Airlines 4 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FHY1345 AYT → NUE Jul 26, 20:40 UTCJul 26, 21:15 UTC35m
2026-07-26 FHY494 - Jul 26, 13:15 UTCJul 26, 17:05 UTC3h 50m
2026-07-26 FHY493 - Jul 26, 07:20 UTCJul 26, 11:25 UTC4h 5m
2026-07-26 FHY728 RIX → AYT Jul 26, 02:20 UTCJul 26, 05:35 UTC3h 15m
2026-07-25 FHY727 AYT → AMS Jul 25, 21:35 UTCJul 26, 01:00 UTC3h 25m
2026-07-25 FHY1552 PRG → AYT Jul 25, 17:10 UTCJul 25, 20:05 UTC2h 55m
2026-07-25 FHY1551 - Jul 25, 13:15 UTCJul 25, 16:00 UTC2h 45m
2026-07-25 FHY1548 - Jul 25, 08:30 UTCJul 25, 11:25 UTC2h 55m
2026-07-25 FHY1547 - Jul 25, 04:05 UTCJul 25, 06:50 UTC2h 45m
2026-07-24 FHY1362 CGN → AYT Jul 24, 22:40 UTCJul 25, 01:45 UTC3h 5m
2026-07-24 FHY1361 AYT → CGN Jul 24, 17:50 UTCJul 24, 21:20 UTC3h 30m
2026-07-24 FHY1274 HAM → AYT Jul 24, 12:40 UTCJul 24, 15:50 UTC3h 10m
2026-07-24 FHY1273 AYT → HAM Jul 24, 07:20 UTCJul 24, 10:45 UTC3h 25m
2026-07-24 FHY1366 CGN → AYT Jul 24, 01:35 UTCJul 24, 04:40 UTC3h 5m
2026-07-23 FHY1365 AYT → CGN Jul 23, 20:40 UTCJul 24, 00:05 UTC3h 25m
2026-07-23 FHY728 RIX → AYT Jul 23, 02:05 UTCJul 23, 05:30 UTC3h 25m
2026-07-22 FHY727 AYT → AMS Jul 22, 21:00 UTCJul 23, 00:20 UTC3h 20m
2026-07-22 FHY1548 - Jul 22, 04:55 UTCJul 22, 11:55 UTC7h 0m
2026-07-21 FHY754 KRK → AYT Jul 21, 22:25 UTCJul 22, 00:45 UTC2h 20m
2026-07-21 FHY753 - Jul 21, 18:30 UTCJul 21, 20:55 UTC2h 25m
2026-07-21 FHY1282 BER → AYT Jul 21, 10:45 UTCJul 21, 13:35 UTC2h 50m
2026-07-21 FHY1281 AYT → BER Jul 21, 05:55 UTCJul 21, 09:00 UTC3h 5m
2026-07-21 FHY1258 HAJ → AYT Jul 21, 01:15 UTCJul 21, 04:25 UTC3h 10m
2026-07-20 FHY1257 AYT → HAJ Jul 20, 20:25 UTCJul 20, 23:40 UTC3h 15m
2026-07-20 FHY1274 HAM → AYT Jul 20, 12:10 UTCJul 20, 15:20 UTC3h 10m
2026-07-20 FHY1273 AYT → HAM Jul 20, 07:25 UTCJul 20, 10:50 UTC3h 25m
2026-07-20 FHY1372 CGN → AYT Jul 20, 01:20 UTCJul 20, 04:40 UTC3h 20m
2026-07-19 FHY1371 AYT → CGN Jul 19, 20:30 UTCJul 20, 00:00 UTC3h 30m
2026-07-19 FHY494 - Jul 19, 13:20 UTCJul 19, 17:20 UTC4h 0m
2026-07-19 FHY493 - Jul 19, 07:25 UTCJul 19, 11:20 UTC3h 55m
2026-07-19 FHY728 RIX → AYT Jul 19, 02:10 UTCJul 19, 05:25 UTC3h 15m
2026-07-18 FHY727 AYT → AMS Jul 18, 21:15 UTCJul 19, 00:35 UTC3h 20m
2026-07-18 FHY1552 PRG → AYT Jul 18, 16:45 UTCJul 18, 19:35 UTC2h 50m
2026-07-18 FHY1551 - Jul 18, 12:20 UTCJul 18, 15:20 UTC3h 0m
2026-07-18 FHY1548 - Jul 18, 08:20 UTCJul 18, 10:45 UTC2h 25m
2026-07-18 FHY1547 - Jul 18, 04:00 UTCJul 18, 06:50 UTC2h 50m
2026-07-17 FHY1362 CGN → AYT Jul 17, 23:10 UTCJul 18, 02:09 UTC3h 0m
2026-07-17 FHY1361 AYT → CGN Jul 17, 18:05 UTCJul 17, 21:39 UTC3h 35m
2026-07-17 FHY822 - Jul 17, 08:25 UTCJul 17, 10:15 UTC1h 50m
2026-07-17 FHY821 - Jul 17, 04:44 UTCJul 17, 06:45 UTC2h 0m
2026-07-17 FHY770 - Jul 17, 00:20 UTCJul 17, 02:54 UTC2h 35m
2026-07-16 FHY769 - Jul 16, 20:45 UTCJul 16, 23:15 UTC2h 30m
2026-07-16 FHY1282 - Jul 16, 09:50 UTCJul 16, 12:49 UTC3h 0m
2026-07-16 FHY1281 - Jul 16, 05:30 UTCJul 16, 08:30 UTC3h 0m
2026-07-15 FHY1204 ERF → AYT Jul 15, 23:15 UTCJul 16, 02:15 UTC3h 0m
2026-07-15 FHY1203 AYT → ERF Jul 15, 18:35 UTCJul 15, 21:55 UTC3h 20m
2026-07-15 FHY1898 - Jul 15, 02:05 UTCJul 15, 02:45 UTC40m
2026-07-14 FHY1897 - Jul 14, 22:10 UTCJul 14, 23:30 UTC1h 19m
2026-07-14 FHY822 - Jul 14, 07:10 UTCJul 14, 09:20 UTC2h 10m
2026-07-14 FHY821 - Jul 14, 04:00 UTCJul 14, 06:00 UTC2h 0m

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 TC-FHM page for operator, model, and routing details .

Mode-S 4B990D frequently asked

What is Mode-S code 4B990D?
4B990D is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-FHM.
Where is Mode-S 4B990D registered?
Mode-S code 4B990D is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B990D broadcasting right now?
Yes. Mode-S 4B990D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B990D, octal 22714415, decimal 4,954,381.
What flights does 4B990D operate?
Mode-S 4B990D has broadcast 20 distinct callsigns, including FHY727, FHY728, FHY754, FHY753, FHY1548.