Apparatus

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sensors Mode-S transponder

4D203B

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-ISM · BOEING 737-800

Hex
4D203B
Octal
23220073
Decimal
5,054,523
Country
MT
Tail
9H-ISM
Type
B738
No current signal · last broadcast 19h ago
Flights observed
233
Distinct callsigns
20
Country
MT
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S 4D203B.

Country allocation

The ICAO 24-bit address 4D203B falls within the block assigned to Malta (MT) by ICAO Annex 10, Volume III. Every aircraft registered in Malta 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
BBG252 Bluebird Airways (BZ) 17 2026-07-16
BBG317 - 13 2026-07-15
BBG316 - 11 2026-07-15
BBG747 - 10 2026-07-11
BBG253 - 10 2026-07-16
BBG887 - 9 2026-07-21
BBG748 Bluebird Airways (BZ) 9 2026-06-13
BBG746 - 9 2026-07-11
BBG888 - 8 2026-07-21
BBG745 - 7 2026-06-16
BBG707 - 7 2026-06-25
BBG753 - 6 2026-07-20
BBG758 - 5 2026-07-17
BBG749 - 5 2026-06-13
BBG702 - 5 2026-07-09
BBG694 - 5 2026-07-10
BBG612 - 5 2026-07-08
BBG611 - 5 2026-07-08
BBG251 Bluebird Airways (BZ) 5 2026-06-29
BBG763 Bluebird Airways (BZ) 4 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 BBG887 JMK → TLV Jul 21, 09:40 UTCJul 21, 11:10 UTC1h 30m
2026-07-21 BBG888 TLV → JMK Jul 21, 05:55 UTCJul 21, 07:25 UTC1h 30m
2026-07-20 BBG751 - Jul 20, 22:00 UTCJul 20, 23:10 UTC1h 10m
2026-07-20 BBG756 TLV → HER Jul 20, 16:55 UTCJul 20, 18:05 UTC1h 10m
2026-07-20 BBG755 HER → TLV Jul 20, 10:55 UTCJul 20, 15:15 UTC4h 20m
2026-07-20 BBG753 - Jul 20, 07:55 UTCJul 20, 09:05 UTC1h 10m
2026-07-20 BBG752 - Jul 20, 05:05 UTCJul 20, 06:15 UTC1h 10m
2026-07-19 BBG751 TLV → TLV Jul 19, 18:55 UTCJul 19, 23:15 UTC4h 20m
2026-07-19 BBG757 HER → TLV Jul 19, 12:10 UTCJul 19, 16:45 UTC4h 35m
2026-07-19 BBG753 - Jul 19, 09:15 UTCJul 19, 10:30 UTC1h 15m
2026-07-19 BBG752 - Jul 19, 06:00 UTCJul 19, 07:15 UTC1h 15m
2026-07-18 BBG757 HER → TLV Jul 18, 12:10 UTCJul 18, 16:05 UTC3h 55m
2026-07-17 BBG758 TLV → TLV Jul 17, 17:25 UTCJul 18, 10:55 UTC17h 31m
2026-07-17 CYF235 - Jul 17, 12:40 UTCJul 17, 14:30 UTC1h 50m
2026-07-17 CYF234 - Jul 17, 08:10 UTCJul 17, 10:05 UTC1h 55m
2026-07-16 BBG253 BCN → TLV Jul 16, 19:35 UTCJul 16, 23:10 UTC3h 35m
2026-07-16 BBG252 TLV → BCN Jul 16, 13:34 UTCJul 16, 17:49 UTC4h 15m
2026-07-16 BBG691 RHO → TLV Jul 16, 10:15 UTCJul 16, 11:25 UTC1h 10m
2026-07-16 BBG692 TLV → RHO Jul 16, 07:00 UTCJul 16, 08:10 UTC1h 10m
2026-07-15 BBG317 VIE → TLV Jul 15, 18:55 UTCJul 15, 21:45 UTC2h 50m
2026-07-15 BBG316 TLV → VIE Jul 15, 14:20 UTCJul 15, 17:40 UTC3h 20m
2026-07-15 BBG801 - Jul 15, 11:05 UTCJul 15, 12:20 UTC1h 15m
2026-07-15 BBG802 - Jul 15, 07:20 UTCJul 15, 08:40 UTC1h 20m
2026-07-14 BBG565 - Jul 14, 20:40 UTCJul 14, 22:30 UTC1h 50m
2026-07-14 BBG564 - Jul 14, 17:35 UTCJul 14, 19:30 UTC1h 55m
2026-07-14 CYF106 - Jul 14, 15:15 UTCJul 14, 16:05 UTC50m
2026-07-14 CYF105 - Jul 14, 13:05 UTCJul 14, 13:45 UTC40m
2026-07-14 CYF108 - Jul 14, 10:30 UTCJul 14, 11:20 UTC50m
2026-07-14 CYF103 - Jul 14, 06:40 UTCJul 14, 07:20 UTC40m
2026-07-13 BBG317 - Jul 13, 16:50 UTCJul 13, 19:55 UTC3h 5m
2026-07-13 BBG316 TLV → VIE Jul 13, 12:25 UTCJul 13, 15:40 UTC3h 15m
2026-07-13 BBG801 KGS → TLV Jul 13, 08:50 UTCJul 13, 10:10 UTC1h 20m
2026-07-13 BBG802 TLV → KGS Jul 13, 06:05 UTCJul 13, 07:25 UTC1h 20m
2026-07-12 BBG751 - Jul 12, 19:55 UTCJul 12, 21:00 UTC1h 5m
2026-07-12 BBG758 - Jul 12, 17:10 UTCJul 12, 18:10 UTC1h 0m
2026-07-12 BBG757 - Jul 12, 14:40 UTCJul 12, 15:50 UTC1h 10m
2026-07-12 BBG753 - Jul 12, 11:05 UTCJul 12, 12:10 UTC1h 5m
2026-07-12 BBG753 - Jul 12, 08:30 UTCJul 12, 09:45 UTC1h 15m
2026-07-12 BBG752 - Jul 12, 05:35 UTCJul 12, 06:40 UTC1h 5m
2026-07-11 BBG253 BCN → TLV Jul 11, 22:15 UTCJul 12, 01:55 UTC3h 40m
2026-07-11 BBG252 TLV → BCN Jul 11, 15:30 UTCJul 11, 18:35 UTC3h 5m
2026-07-11 BBG252 TLV → BCN Jul 11, 14:25 UTCJul 11, 15:25 UTC1h 0m
2026-07-11 BBG747 - Jul 11, 09:20 UTCJul 11, 10:40 UTC1h 20m
2026-07-11 BBG746 - Jul 11, 05:50 UTCJul 11, 07:05 UTC1h 15m
2026-07-10 BBG693 RHO → TLV Jul 10, 19:25 UTCJul 10, 20:30 UTC1h 5m
2026-07-10 BBG694 TLV → RHO Jul 10, 14:40 UTCJul 10, 15:50 UTC1h 10m
2026-07-10 CYF108 - Jul 10, 09:05 UTCJul 10, 09:50 UTC45m
2026-07-10 CYF103 - Jul 10, 07:10 UTCJul 10, 07:45 UTC35m
2026-07-09 CYF461 PRG → TLV Jul 9, 20:25 UTCJul 9, 23:40 UTC3h 15m
2026-07-09 CYF462 TLV → PRG Jul 9, 15:05 UTCJul 9, 18:55 UTC3h 50m

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 9H-ISM page for operator, model, and routing details .

Mode-S 4D203B frequently asked

What is Mode-S code 4D203B?
4D203B is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-ISM.
Where is Mode-S 4D203B registered?
Mode-S code 4D203B is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D203B broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D203B, octal 23220073, decimal 5,054,523.
What flights does 4D203B operate?
Mode-S 4D203B has broadcast 20 distinct callsigns, including BBG252, BBG317, BBG316, BBG747, BBG253.