Apparatus

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sensors Mode-S transponder

4D21E6

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D21E6
Octal
23220746
Decimal
5,054,950
Country
MT
Tail
9H-SHO
Type
B738
Broadcasting now · callsign BBG703 · 35,000 ft
Flights observed
137
Distinct callsigns
20
Country
MT
Last broadcast
7h ago

Current position

4D21E6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21E6 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
BBG706 Bluebird Airways (BZ) 19 2026-06-20
BBG705 Bluebird Airways (BZ) 14 2026-06-20
BBG707 - 12 2026-06-21
BBG252 Bluebird Airways (BZ) 12 2026-06-24
BBG708 - 9 2026-06-21
BBG317 Bluebird Airways (BZ) 8 2026-06-16
BBG316 Bluebird Airways (BZ) 7 2026-06-15
BBG251 Bluebird Airways (BZ) 7 2026-06-16
BBG253 - 5 2026-06-24
BBG747 - 4 2026-06-09
BBG888 - 3 2026-06-25
BBG887 - 3 2026-06-25
BBG746 - 3 2026-06-07
BBG704 - 3 2026-06-25
BBG703 Bluebird Airways (BZ) 3 2026-06-23
BBG701 Bluebird Airways (BZ) 3 2026-06-23
BBG745 - 2 2026-06-07
BBG702 - 2 2026-06-23
CYF219 - 1 2026-05-29
CYF218 Company Flight 1 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 BBG704 - Jun 25, 13:14 UTCJun 25, 14:59 UTC1h 45m
2026-06-25 BBG887 - Jun 25, 10:35 UTCJun 25, 11:54 UTC1h 20m
2026-06-25 BBG888 TLV → JMK Jun 25, 06:44 UTCJun 25, 08:14 UTC1h 30m
2026-06-24 BBG253 BCN → TLV Jun 24, 22:35 UTCJun 25, 02:19 UTC3h 45m
2026-06-24 BBG252 TLV → BCN Jun 24, 12:04 UTCJun 24, 16:09 UTC4h 5m
2026-06-24 BBG887 JMK → TLV Jun 24, 09:15 UTCJun 24, 10:39 UTC1h 25m
2026-06-24 BBG888 TLV → JMK Jun 24, 05:15 UTCJun 24, 06:55 UTC1h 40m
2026-06-23 BBG703 ATH → TLV Jun 23, 21:24 UTCJun 23, 22:55 UTC1h 30m
2026-06-23 BBG704 - Jun 23, 14:15 UTCJun 23, 15:59 UTC1h 45m
2026-06-23 BBG701 ATH → TLV Jun 23, 10:19 UTCJun 23, 11:59 UTC1h 40m
2026-06-23 BBG702 TLV → ATH Jun 23, 06:24 UTCJun 23, 08:09 UTC1h 45m
2026-06-22 BBG703 ATH → TLV Jun 22, 21:40 UTCJun 22, 23:14 UTC1h 35m
2026-06-22 BBG704 TLV → ATH Jun 22, 12:44 UTCJun 22, 14:29 UTC1h 45m
2026-06-22 BBG887 JMK → TLV Jun 22, 10:00 UTCJun 22, 11:24 UTC1h 25m
2026-06-22 BBG888 TLV → JMK Jun 22, 06:00 UTCJun 22, 07:30 UTC1h 30m
2026-06-21 BBG707 ATH → TLV Jun 21, 22:20 UTCJun 21, 23:55 UTC1h 35m
2026-06-21 BBG708 TLV → ATH Jun 21, 19:09 UTCJun 21, 20:54 UTC1h 45m
2026-06-21 CYF157 - Jun 21, 15:54 UTCJun 21, 16:39 UTC45m
2026-06-21 CYF156 - Jun 21, 11:40 UTCJun 21, 12:24 UTC45m
2026-06-21 BBG755 - Jun 21, 09:00 UTCJun 21, 10:04 UTC1h 5m
2026-06-21 BBG742 - Jun 21, 01:14 UTCJun 21, 02:30 UTC1h 15m
2026-06-20 BBG705 ATH → TLV Jun 20, 21:34 UTCJun 20, 23:10 UTC1h 35m
2026-06-20 BBG706 ATH → TCP Jun 20, 11:34 UTCJun 20, 13:24 UTC1h 50m
2026-06-20 BBG707 ATH → TLV Jun 20, 08:29 UTCJun 20, 10:09 UTC1h 40m
2026-06-19 BBG706 ATH → TCP Jun 19, 10:04 UTCJun 19, 11:49 UTC1h 45m
2026-06-19 BBG707 ATH → TLV Jun 19, 05:14 UTCJun 19, 06:49 UTC1h 35m
2026-06-18 BBG708 TLV → ATH Jun 18, 17:30 UTCJun 18, 19:15 UTC1h 45m
2026-06-18 BBG707 ATH → AMM Jun 18, 14:15 UTCJun 18, 16:05 UTC1h 50m
2026-06-18 BBG706 ATH → TCP Jun 18, 06:50 UTCJun 18, 08:35 UTC1h 45m
2026-06-18 BBG705 ATH → TLV Jun 18, 03:10 UTCJun 18, 04:50 UTC1h 40m
2026-06-17 BBG708 TLV → ATH Jun 17, 14:40 UTCJun 17, 16:25 UTC1h 45m
2026-06-17 BBG707 ATH → TLV Jun 17, 10:15 UTCJun 17, 12:00 UTC1h 45m
2026-06-17 BBG706 ATH → TCP Jun 17, 04:40 UTCJun 17, 06:30 UTC1h 50m
2026-06-16 BBG251 BCN → TLV Jun 16, 21:45 UTCJun 17, 01:30 UTC3h 45m
2026-06-16 BBG252 TLV → BCN Jun 16, 15:20 UTCJun 16, 19:30 UTC4h 10m
2026-06-16 BBG317 VIE → TLV Jun 16, 08:05 UTCJun 16, 11:05 UTC3h 0m
2026-06-15 BBG316 TLV → VIE Jun 15, 15:45 UTCJun 15, 19:05 UTC3h 20m
2026-06-15 BBG317 VIE → TLV Jun 15, 11:15 UTCJun 15, 14:20 UTC3h 5m
2026-06-14 BBG316 TLV → VIE Jun 14, 17:40 UTCJun 14, 21:05 UTC3h 25m
2026-06-14 BBG317 VIE → TLV Jun 14, 13:25 UTCJun 14, 16:20 UTC2h 55m
2026-06-12 BBG316 TLV → VIE Jun 12, 12:00 UTCJun 12, 15:25 UTC3h 25m
2026-06-12 BBG317 VIE → TLV Jun 12, 05:45 UTCJun 12, 08:55 UTC3h 10m
2026-06-11 BBG316 TLV → VIE Jun 11, 13:40 UTCJun 11, 16:50 UTC3h 10m
2026-06-11 BBG317 VIE → TLV Jun 11, 08:00 UTCJun 11, 11:15 UTC3h 15m
2026-06-10 BBG316 TLV → VIE Jun 10, 14:45 UTCJun 10, 18:00 UTC3h 15m
2026-06-10 BBG317 VIE → TLV Jun 10, 09:50 UTCJun 10, 12:55 UTC3h 5m
2026-06-09 BBG316 TLV → VIE Jun 9, 14:05 UTCJun 9, 17:25 UTC3h 20m
2026-06-09 BBG747 - Jun 9, 10:30 UTCJun 9, 11:45 UTC1h 15m
2026-06-08 BBG747 - Jun 8, 05:40 UTCJun 8, 16:50 UTC11h 10m
2026-06-08 BBG743 - Jun 8, 00:10 UTCJun 8, 01:20 UTC1h 10m

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-SHO page for operator, model, and routing details .

Mode-S 4D21E6 frequently asked

What is Mode-S code 4D21E6?
4D21E6 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-SHO.
Where is Mode-S 4D21E6 registered?
Mode-S code 4D21E6 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21E6 broadcasting right now?
Yes. Mode-S 4D21E6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21E6, octal 23220746, decimal 5,054,950.
What flights does 4D21E6 operate?
Mode-S 4D21E6 has broadcast 20 distinct callsigns, including BBG706, BBG705, BBG707, BBG252, BBG708.