Apparatus

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sensors Mode-S transponder

4B991A

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-FHZ · AIRBUS A-320

Hex
4B991A
Octal
22714432
Decimal
4,954,394
Country
TR
Tail
TC-FHZ
Type
A320
Broadcasting now · callsign FHY491 · 36,000 ft
Flights observed
107
Distinct callsigns
20
Country
TR
Last broadcast
39m ago

Current position

4B991A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B991A 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
FHY728 Freebird Airlines 7 2026-05-18
FHY727 Freebird Airlines 7 2026-05-17
FHY732 - 5 2026-05-21
FHY731 Freebird Airlines 5 2026-05-20
FHY744 Freebird Airlines 4 2026-05-22
FHY743 - 4 2026-05-21
FHY862 Freebird Airlines 3 2026-05-15
FHY770 Freebird Airlines 3 2026-05-22
FHY769 - 3 2026-05-22
FHY491 Freebird Airlines 3 2026-05-30
FHY418 Freebird Airlines 3 2026-05-30
FHY417 Freebird Airlines 3 2026-05-29
FHY9606 - 2 2026-04-13
FHY9506 - 2 2026-04-13
FHY9307 - 2 2026-04-13
FHY861 - 2 2026-05-15
FHY752 - 2 2026-05-10
FHY751 Freebird Airlines 2 2026-05-10
FHY694 - 2 2026-05-19
FHY693 - 2 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 FHY491 AYT → LLA May 30, 07:20 UTCMay 30, 08:30 UTC1h 10m
2026-05-30 FHY418 TLL → AYT May 30, 01:50 UTCMay 30, 05:10 UTC3h 20m
2026-05-29 FHY417 AYT → TLL May 29, 20:30 UTCMay 30, 00:40 UTC4h 10m
2026-05-29 FHY1304 MUC → AYT May 29, 16:20 UTCMay 29, 19:00 UTC2h 40m
2026-05-29 FHY1303 AYT → MUC May 29, 11:45 UTCMay 29, 14:50 UTC3h 5m
2026-05-28 FHY214 - May 28, 19:30 UTCMay 28, 21:45 UTC2h 15m
2026-05-28 FHY303P - May 28, 17:15 UTCMay 28, 18:20 UTC1h 5m
2026-05-23 FHY1387 AYT → PAD May 23, 19:05 UTCMay 23, 22:25 UTC3h 20m
2026-05-22 FHY1346 NUE → AYT May 22, 22:30 UTCMay 23, 01:20 UTC2h 50m
2026-05-22 FHY1345 AYT → NUE May 22, 18:30 UTCMay 22, 21:20 UTC2h 50m
2026-05-22 FHY770 KTW → AYT May 22, 11:10 UTCMay 22, 13:40 UTC2h 30m
2026-05-22 FHY769 - May 22, 07:05 UTCMay 22, 09:35 UTC2h 30m
2026-05-22 FHY744 KUN → AYT May 22, 02:15 UTCMay 22, 05:25 UTC3h 10m
2026-05-21 FHY743 - May 21, 20:50 UTCMay 21, 23:55 UTC3h 5m
2026-05-21 FHY732 - May 21, 01:40 UTCMay 21, 05:30 UTC3h 50m
2026-05-20 FHY731 LEJ → DTM May 20, 20:40 UTCMay 21, 00:10 UTC3h 30m
2026-05-20 FHY744 KUN → AYT May 20, 01:50 UTCMay 20, 04:55 UTC3h 6m
2026-05-19 FHY743 - May 19, 20:35 UTCMay 19, 23:30 UTC2h 55m
2026-05-19 FHY694 - May 19, 12:05 UTCMay 19, 15:20 UTC3h 15m
2026-05-19 FHY693 - May 19, 07:20 UTCMay 19, 10:35 UTC3h 15m
2026-05-19 FHY732 TLL → AYT May 19, 01:40 UTCMay 19, 05:20 UTC3h 40m
2026-05-18 FHY731 LEJ → DTM May 18, 20:30 UTCMay 19, 00:05 UTC3h 35m
2026-05-18 FHY728 RIX → AYT May 18, 01:55 UTCMay 18, 05:20 UTC3h 25m
2026-05-17 FHY727 AYT → AMS May 17, 20:50 UTCMay 18, 00:05 UTC3h 15m
2026-05-17 FHY732 - May 17, 01:40 UTCMay 17, 05:15 UTC3h 35m
2026-05-16 FHY731 LEJ → DTM May 16, 20:50 UTCMay 17, 00:25 UTC3h 35m
2026-05-16 FHY492 LLA → AYT May 16, 12:55 UTCMay 16, 17:25 UTC4h 30m
2026-05-16 FHY491 AYT → LLA May 16, 07:11 UTCMay 16, 11:25 UTC4h 15m
2026-05-16 FHY418 TLL → AYT May 16, 01:40 UTCMay 16, 05:30 UTC3h 50m
2026-05-15 FHY417 AYT → TLL May 15, 20:30 UTCMay 16, 00:10 UTC3h 40m
2026-05-15 FHY862 OTP → AYT May 15, 08:40 UTCMay 15, 10:10 UTC1h 30m
2026-05-15 FHY861 - May 15, 05:50 UTCMay 15, 07:25 UTC1h 35m
2026-05-14 FHY1256 HAJ → AYT May 14, 22:45 UTCMay 15, 01:55 UTC3h 10m
2026-05-14 FHY1255 AYT → HAJ May 14, 17:50 UTCMay 14, 21:05 UTC3h 15m
2026-05-14 FHY1282 BER → AYT May 14, 09:50 UTCMay 14, 12:55 UTC3h 5m
2026-05-14 FHY1281 AYT → BER May 14, 05:25 UTCMay 14, 08:20 UTC2h 55m
2026-05-10 FHY752 - May 10, 08:54 UTCMay 10, 11:20 UTC2h 25m
2026-05-10 FHY751 AYT → VIE May 10, 04:15 UTCMay 10, 06:59 UTC2h 45m
2026-05-09 FHY1388 PAD → AYT May 9, 22:39 UTCMay 10, 01:34 UTC2h 55m
2026-05-09 FHY1387 AYT → PAD May 9, 17:55 UTCMay 9, 21:25 UTC3h 30m
2026-05-09 FHY472 - May 9, 14:30 UTCMay 9, 15:10 UTC40m
2026-05-09 FHY472 - May 9, 10:05 UTCMay 9, 13:15 UTC3h 10m
2026-05-09 FHY471 - May 9, 05:30 UTCMay 9, 09:05 UTC3h 35m
2026-05-09 FHY1258 HAJ → AYT May 9, 00:55 UTCMay 9, 04:05 UTC3h 10m
2026-05-08 FHY1257 AYT → HAJ May 8, 20:15 UTCMay 8, 23:35 UTC3h 20m
2026-05-08 FHY1274 HAM → AYT May 8, 12:39 UTCMay 8, 15:50 UTC3h 10m
2026-05-08 FHY1273 AYT → HAM May 8, 08:05 UTCMay 8, 10:59 UTC2h 55m
2026-05-08 FHY728 RIX → AYT May 8, 01:49 UTCMay 8, 05:05 UTC3h 15m
2026-05-07 FHY727 AYT → AMS May 7, 20:50 UTCMay 8, 00:05 UTC3h 15m
2026-05-07 FHY728 RIX → AYT May 7, 02:05 UTCMay 7, 05:20 UTC3h 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 TC-FHZ page for operator, model, and routing details .

Mode-S 4B991A frequently asked

What is Mode-S code 4B991A?
4B991A is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-FHZ.
Where is Mode-S 4B991A registered?
Mode-S code 4B991A is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B991A broadcasting right now?
Yes. Mode-S 4B991A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B991A, octal 22714432, decimal 4,954,394.
What flights does 4B991A operate?
Mode-S 4B991A has broadcast 20 distinct callsigns, including FHY728, FHY727, FHY732, FHY731, FHY744.