Apparatus

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sensors Mode-S transponder

4D21C2

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-NYC · EMBRAER ERJ-190-100

Hex
4D21C2
Octal
23220702
Decimal
5,054,914
Country
MT
Tail
9H-NYC
Type
E190
No current signal · last broadcast Jul 26, 15:45 UTC
Flights observed
103
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 15:45 UTC

Last known position

Most recent position reported by Mode-S 4D21C2.

Country allocation

The ICAO 24-bit address 4D21C2 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
AXY626U - 3 2026-06-08
AXY842T - 2 2026-06-16
AXY611K - 2 2026-06-21
AXY293V - 2 2026-06-04
AXY133C - 2 2026-04-13
AXY99NR - 1 2026-05-27
AXY994Y - 1 2026-07-09
AXY974K - 1 2026-06-14
AXY969W - 1 2026-07-10
AXY967P - 1 2026-07-09
AXY963T - 1 2026-06-26
AXY962M - 1 2026-07-07
AXY951U - 1 2026-07-21
AXY944V - 1 2026-06-09
AXY937C - 1 2026-05-09
AXY932Q - 1 2026-05-30
AXY924S - 1 2026-06-08
AXY8955 - 1 2026-07-15
AXY881F - 1 2026-07-24
AXY878X - 1 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AXY334H - Jul 26, 11:45 UTCJul 26, 15:45 UTC4h 0m
2026-07-25 AXY225P - Jul 25, 19:20 UTCJul 25, 20:45 UTC1h 25m
2026-07-25 AXY157A - Jul 25, 14:15 UTCJul 25, 16:25 UTC2h 10m
2026-07-25 AXY221J - Jul 25, 02:45 UTCJul 25, 04:45 UTC2h 0m
2026-07-24 AXY881F - Jul 24, 21:15 UTCJul 24, 23:15 UTC2h 0m
2026-07-23 AXY624Y - Jul 23, 10:25 UTCJul 23, 12:05 UTC1h 40m
2026-07-23 AXY230C - Jul 23, 08:10 UTCJul 23, 08:55 UTC45m
2026-07-21 AXY951U AMS → LBG Jul 21, 12:45 UTCJul 21, 13:40 UTC55m
2026-07-20 AXY845N LIS → AMS Jul 20, 16:25 UTCJul 20, 18:45 UTC2h 20m
2026-07-20 AXY365T OPO → LIS Jul 20, 14:30 UTCJul 20, 15:20 UTC50m
2026-07-20 AXY835R - Jul 20, 10:25 UTCJul 20, 12:20 UTC1h 55m
2026-07-19 AXY861G - Jul 19, 15:30 UTCJul 19, 16:20 UTC50m
2026-07-19 AXY566K IBZ → GVA Jul 19, 13:05 UTCJul 19, 14:40 UTC1h 35m
2026-07-19 AXY340R BUD → IBZ Jul 19, 08:25 UTCJul 19, 11:00 UTC2h 35m
2026-07-18 AXY614P - Jul 18, 09:30 UTCJul 18, 11:00 UTC1h 30m
2026-07-17 AXY281R AMS → RKE Jul 17, 13:40 UTCJul 17, 14:30 UTC50m
2026-07-17 AXY199W MAN → AMS Jul 17, 11:10 UTCJul 17, 12:04 UTC55m
2026-07-16 AXY783H - Jul 16, 16:05 UTCJul 16, 16:40 UTC35m
2026-07-16 AXY701G LIN → LTN Jul 16, 12:44 UTCJul 16, 14:25 UTC1h 40m
2026-07-15 AXY431X NCE → LIN Jul 15, 14:40 UTCJul 15, 15:15 UTC35m
2026-07-15 AXY5352 JMK → NCE Jul 15, 10:50 UTCJul 15, 13:20 UTC2h 30m
2026-07-15 AXY8955 NCE → JMK Jul 15, 07:55 UTCJul 15, 10:05 UTC2h 10m
2026-07-13 AXY2206 - Jul 13, 06:35 UTCJul 13, 15:05 UTC8h 30m
2026-07-13 AXY2205 - Jul 13, 02:45 UTCJul 13, 04:25 UTC1h 40m
2026-07-11 AXY324C BCN → MDW Jul 11, 23:20 UTCJul 12, 09:35 UTC10h 15m
2026-07-10 AXY969W BQH → BCN Jul 10, 16:35 UTCJul 10, 18:15 UTC1h 40m
2026-07-09 AXY967P LIN → BQH Jul 9, 12:45 UTCJul 9, 14:15 UTC1h 30m
2026-07-09 AXY994Y - Jul 9, 10:00 UTCJul 9, 11:05 UTC1h 5m
2026-07-07 AXY962M LTN → LBG Jul 7, 11:05 UTCJul 7, 12:00 UTC55m
2026-07-07 AXY755E - Jul 7, 08:25 UTCJul 7, 09:05 UTC40m
2026-07-06 AXY305G JMK → HUY Jul 6, 10:55 UTCJul 6, 14:30 UTC3h 35m
2026-07-06 AXY467X AYT → JMK Jul 6, 08:40 UTCJul 6, 09:40 UTC1h 0m
2026-07-05 AXY316H - Jul 5, 16:05 UTCJul 5, 20:10 UTC4h 5m
2026-07-05 AXY572L - Jul 5, 13:40 UTCJul 5, 14:55 UTC1h 15m
2026-07-04 AXY498S - Jul 4, 07:15 UTCJul 4, 11:35 UTC4h 20m
2026-07-03 AXY476J IBZ → LBG Jul 3, 13:15 UTCJul 3, 15:05 UTC1h 50m
2026-07-03 AXY337D - Jul 3, 10:35 UTCJul 3, 12:20 UTC1h 45m
2026-07-03 AXY602A - Jul 3, 08:30 UTCJul 3, 09:30 UTC1h 0m
2026-07-01 AXY601B IAD → NCE Jul 1, 22:35 UTCJul 2, 06:41 UTC8h 6m
2026-07-01 AXY018H - Jul 1, 19:10 UTCJul 1, 20:40 UTC1h 30m
2026-06-30 AXY872X - Jun 30, 08:20 UTCJun 30, 10:20 UTC2h 0m
2026-06-28 AXY794W - Jun 28, 17:19 UTCJun 28, 18:25 UTC1h 5m
2026-06-28 AXY221P - Jun 28, 15:09 UTCJun 28, 16:25 UTC1h 15m
2026-06-28 AXY797P - Jun 28, 07:14 UTCJun 28, 09:10 UTC1h 55m
2026-06-26 AXY963T - Jun 26, 16:35 UTCJun 26, 17:09 UTC35m
2026-06-26 AXY852Z - Jun 26, 11:20 UTCJun 26, 13:40 UTC2h 20m
2026-06-24 AXY153U - Jun 24, 07:24 UTCJun 24, 09:05 UTC1h 40m
2026-06-24 AXY471Q - Jun 24, 04:44 UTCJun 24, 06:25 UTC1h 40m
2026-06-21 AXY780A NCE → LBG Jun 21, 21:29 UTCJun 22, 10:34 UTC13h 5m
2026-06-21 AXY611K - Jun 21, 01:10 UTCJun 21, 04:49 UTC3h 40m

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

Mode-S 4D21C2 frequently asked

What is Mode-S code 4D21C2?
4D21C2 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-NYC.
Where is Mode-S 4D21C2 registered?
Mode-S code 4D21C2 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21C2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21C2, octal 23220702, decimal 5,054,914.
What flights does 4D21C2 operate?
Mode-S 4D21C2 has broadcast 20 distinct callsigns, including AXY626U, AXY842T, AXY611K, AXY293V, AXY133C.