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 FHY1203 · 34,025 ft
Flights observed
325
Distinct callsigns
20
Country
TR
Last broadcast
Jul 26, 22:30 UTC

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
FHY727 Freebird Airlines 15 2026-07-26
FHY728 - 13 2026-07-11
FHY770 - 11 2026-07-12
FHY769 - 10 2026-07-12
FHY732 - 10 2026-07-24
FHY731 Freebird Airlines 10 2026-07-23
FHY1548 - 9 2026-07-21
FHY1547 - 9 2026-07-21
FHY752 - 7 2026-07-13
FHY744 - 7 2026-07-01
FHY743 - 7 2026-06-30
FHY491 Freebird Airlines 7 2026-06-20
FHY417 - 7 2026-07-15
FHY751 - 6 2026-07-13
FHY492 Freebird Airlines 6 2026-06-20
FHY418 - 6 2026-07-16
FHY1898 Freebird Airlines 5 2026-07-21
FHY1897 Freebird Airlines 5 2026-07-20
FHY862 - 4 2026-07-03
FHY848 - 4 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FHY727 AYT → AMS Jul 26, 20:55 UTCJul 26, 22:30 UTC1h 35m
2026-07-26 FHY784 BTS → AYT Jul 26, 17:05 UTCJul 26, 19:10 UTC2h 5m
2026-07-26 FHY783 AYT → BTS Jul 26, 13:00 UTCJul 26, 15:35 UTC2h 35m
2026-07-26 FHY1322 STR → AYT Jul 26, 08:40 UTCJul 26, 11:30 UTC2h 50m
2026-07-26 FHY1321 AYT → STR Jul 26, 03:45 UTCJul 26, 06:55 UTC3h 11m
2026-07-25 FHY1388 PAD → AYT Jul 25, 22:40 UTCJul 26, 01:40 UTC3h 0m
2026-07-25 FHY1387 AYT → PAD Jul 25, 18:05 UTCJul 25, 21:25 UTC3h 20m
2026-07-25 FHY1194 DUS → AYT Jul 25, 10:30 UTCJul 25, 14:25 UTC3h 55m
2026-07-25 FHY1193 AYT → DUS Jul 25, 05:20 UTCJul 25, 08:45 UTC3h 25m
2026-07-24 FHY1204 ERF → AYT Jul 24, 23:25 UTCJul 25, 02:10 UTC2h 45m
2026-07-24 FHY1203 AYT → ERF Jul 24, 18:35 UTCJul 24, 21:55 UTC3h 20m
2026-07-24 FHY1322 STR → AYT Jul 24, 13:40 UTCJul 24, 16:20 UTC2h 40m
2026-07-24 FHY1321 AYT → STR Jul 24, 09:05 UTCJul 24, 12:15 UTC3h 10m
2026-07-24 FHY732 - Jul 24, 02:05 UTCJul 24, 05:30 UTC3h 25m
2026-07-23 FHY731 LEJ → DTM Jul 23, 20:35 UTCJul 24, 00:10 UTC3h 35m
2026-07-23 FHY718 - Jul 23, 15:10 UTCJul 23, 17:15 UTC2h 5m
2026-07-23 FHY717 - Jul 23, 11:40 UTCJul 23, 13:55 UTC2h 15m
2026-07-22 FHY1362 CGN → AYT Jul 22, 23:00 UTCJul 23, 01:55 UTC2h 55m
2026-07-22 FHY1361 AYT → CGN Jul 22, 18:05 UTCJul 22, 21:45 UTC3h 40m
2026-07-22 FHY234 - Jul 22, 13:10 UTCJul 22, 15:30 UTC2h 20m
2026-07-22 FHY233 - Jul 22, 10:20 UTCJul 22, 11:55 UTC1h 35m
2026-07-22 FHY732 - Jul 22, 01:55 UTCJul 22, 05:25 UTC3h 30m
2026-07-21 FHY731 LEJ → DTM Jul 21, 20:40 UTCJul 22, 00:35 UTC3h 55m
2026-07-21 FHY1548 PRG → AYT Jul 21, 09:00 UTCJul 21, 11:40 UTC2h 40m
2026-07-21 FHY1547 - Jul 21, 04:50 UTCJul 21, 07:35 UTC2h 45m
2026-07-21 FHY1898 RMO → AYT Jul 21, 01:20 UTCJul 21, 03:10 UTC1h 50m
2026-07-20 FHY1897 AYT → RMO Jul 20, 22:05 UTCJul 20, 23:35 UTC1h 30m
2026-07-20 FHY1562 CGN → AYT Jul 20, 05:05 UTCJul 20, 08:15 UTC3h 10m
2026-07-20 FHY1561 AYT → CGN Jul 20, 00:05 UTCJul 20, 03:30 UTC3h 25m
2026-07-19 FHY214 BRQ → AYT Jul 19, 18:30 UTCJul 19, 20:45 UTC2h 15m
2026-07-19 FHY213 - Jul 19, 14:50 UTCJul 19, 17:25 UTC2h 35m
2026-07-19 FHY1322 STR → AYT Jul 19, 08:35 UTCJul 19, 11:35 UTC3h 0m
2026-07-19 FHY1321 AYT → STR Jul 19, 03:55 UTCJul 19, 07:00 UTC3h 5m
2026-07-18 FHY1388 PAD → AYT Jul 18, 23:10 UTCJul 19, 02:10 UTC3h 0m
2026-07-18 FHY1387 AYT → PAD Jul 18, 18:35 UTCJul 18, 22:00 UTC3h 25m
2026-07-18 FHY1194 DUS → AYT Jul 18, 10:40 UTCJul 18, 13:50 UTC3h 10m
2026-07-18 FHY1193 AYT → DUS Jul 18, 05:15 UTCJul 18, 08:45 UTC3h 30m
2026-07-18 FHY816 - Jul 18, 01:25 UTCJul 18, 02:45 UTC1h 20m
2026-07-17 FHY815 - Jul 17, 22:29 UTCJul 18, 00:00 UTC1h 30m
2026-07-17 FHY786 BTS → AYT Jul 17, 18:19 UTCJul 17, 20:29 UTC2h 10m
2026-07-17 FHY785 - Jul 17, 14:39 UTCJul 17, 17:05 UTC2h 25m
2026-07-17 FHY918 - Jul 17, 07:14 UTCJul 17, 09:25 UTC2h 10m
2026-07-17 FHY917 - Jul 17, 03:39 UTCJul 17, 05:50 UTC2h 10m
2026-07-16 FHY1256 HAJ → AYT Jul 16, 23:15 UTCJul 17, 02:15 UTC3h 0m
2026-07-16 FHY1255 - Jul 16, 18:00 UTCJul 16, 21:30 UTC3h 30m
2026-07-16 FHY418 TLL → AYT Jul 16, 01:50 UTCJul 16, 05:20 UTC3h 30m
2026-07-15 FHY417 - Jul 15, 20:50 UTCJul 16, 00:35 UTC3h 45m
2026-07-15 FHY964 - Jul 15, 04:30 UTCJul 15, 07:40 UTC3h 10m
2026-07-14 FHY963 - Jul 14, 23:35 UTCJul 15, 03:10 UTC3h 35m
2026-07-14 FHY1548 - Jul 14, 08:45 UTCJul 14, 11:15 UTC2h 30m

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 FHY727, FHY728, FHY770, FHY769, FHY732.