Apparatus

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sensors Mode-S transponder

4A3121

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-LIA · AIRBUS A-320

Hex
4A3121
Octal
22430441
Decimal
4,862,241
Country
RO
Tail
YR-LIA
Type
A320
No current signal · last broadcast 1h ago
Flights observed
131
Distinct callsigns
20
Country
RO
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4A3121.

Country allocation

The ICAO 24-bit address 4A3121 falls within the block assigned to Romania (RO) by ICAO Annex 10, Volume III. Every aircraft registered in Romania 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
AIZ425 - 8 2026-04-20
AIZ426 - 7 2026-04-20
AIZ367 Arkia Israel Airlines 6 2026-05-31
AIZ368 - 5 2026-05-31
AIZ827 Arkia Israel Airlines 3 2026-06-02
AIZ54 Arkia Israel Airlines 3 2026-06-01
AIZ53 Arkia Israel Airlines 3 2026-06-01
AIZ424 Arkia Israel Airlines 3 2026-05-27
AIZ423 Arkia Israel Airlines 3 2026-05-27
AIZ414 Arkia Israel Airlines 3 2026-05-15
AIZ364 Arkia Israel Airlines 3 2026-06-01
AIZ283 Arkia Israel Airlines 3 2026-05-27
AIZ164 Arkia Israel Airlines 3 2026-05-16
AIZ822 Arkia Israel Airlines 2 2026-05-18
AIZ821 Arkia Israel Airlines 2 2026-05-18
AIZ802 Arkia Israel Airlines 2 2026-05-06
AIZ413 Arkia Israel Airlines 2 2026-05-15
AIZ412 Arkia Israel Airlines 2 2026-05-14
AIZ411 Arkia Israel Airlines 2 2026-05-14
AIZ292 Arkia Israel Airlines 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 AIZ827 TLV → ETM Jun 2, 17:45 UTCJun 2, 18:10 UTC25m
2026-06-02 AIZ370 TIV → TLV Jun 2, 12:10 UTCJun 2, 14:50 UTC2h 40m
2026-06-02 AIZ369 - Jun 2, 07:20 UTCJun 2, 09:45 UTC2h 25m
2026-06-01 AIZ54 CFU → TLV Jun 1, 17:50 UTCJun 1, 19:50 UTC2h 0m
2026-06-01 AIZ53 TLV → CFU Jun 1, 13:55 UTCJun 1, 15:55 UTC2h 0m
2026-06-01 AIZ364 SOF → TLV Jun 1, 09:35 UTCJun 1, 11:40 UTC2h 5m
2026-06-01 AIZ363 TLV → SOF Jun 1, 06:00 UTCJun 1, 08:05 UTC2h 5m
2026-06-01 AIZ1218 ATH → TLV Jun 1, 02:00 UTCJun 1, 03:30 UTC1h 30m
2026-05-31 AIZ1217 TLV → ATH May 31, 21:05 UTCMay 31, 22:50 UTC1h 45m
2026-05-31 AIZ368 - May 31, 17:20 UTCMay 31, 19:45 UTC2h 25m
2026-05-31 AIZ367 SOF → VAR May 31, 12:30 UTCMay 31, 15:05 UTC2h 35m
2026-05-31 AIZ812 ETM → ETM May 31, 10:40 UTCMay 31, 11:10 UTC30m
2026-05-31 AIZ811 TLV → TLV May 31, 08:35 UTCMay 31, 09:05 UTC30m
2026-05-30 AIZ418 TBS → TLV May 30, 19:05 UTCMay 30, 21:35 UTC2h 30m
2026-05-30 AIZ417 TLV → TBS May 30, 15:25 UTCMay 30, 17:35 UTC2h 10m
2026-05-30 AIZ344 VRN → TLV May 30, 09:00 UTCMay 30, 12:15 UTC3h 15m
2026-05-30 AIZ343 TLV → VCE May 30, 02:55 UTCMay 30, 06:20 UTC3h 25m
2026-05-29 AIZ346 - May 29, 12:05 UTCMay 29, 14:50 UTC2h 45m
2026-05-29 AIZ345 - May 29, 07:10 UTCMay 29, 10:05 UTC2h 55m
2026-05-29 AIZ290 BTS → TLV May 29, 02:10 UTCMay 29, 05:05 UTC2h 55m
2026-05-28 AIZ289 TLV → BTS May 28, 21:05 UTCMay 29, 00:20 UTC3h 15m
2026-05-28 AIZ368 - May 28, 17:15 UTCMay 28, 19:35 UTC2h 20m
2026-05-28 AIZ367 SOF → VAR May 28, 12:35 UTCMay 28, 15:00 UTC2h 25m
2026-05-28 AIZ218 ATH → TLV May 28, 07:55 UTCMay 28, 09:35 UTC1h 40m
2026-05-28 AIZ1217 TLV → ATH May 28, 04:50 UTCMay 28, 06:35 UTC1h 45m
2026-05-27 AIZ284 PRG → TLV May 27, 20:05 UTCMay 27, 23:30 UTC3h 25m
2026-05-27 AIZ283 TLV → PRG May 27, 14:40 UTCMay 27, 18:10 UTC3h 30m
2026-05-27 AIZ424 VIE → TLV May 27, 09:50 UTCMay 27, 13:00 UTC3h 10m
2026-05-27 AIZ423 TLV → VIE May 27, 04:34 UTCMay 27, 07:45 UTC3h 10m
2026-05-26 AIZ2550 VNO → TLV May 26, 07:55 UTCMay 26, 11:44 UTC3h 50m
2026-05-26 AIZ2549 TLV → VNO May 26, 02:15 UTCMay 26, 06:10 UTC3h 55m
2026-05-25 AIZ162 LCA → TLV May 25, 21:15 UTCMay 25, 21:49 UTC35m
2026-05-25 AIZ1161 TLV → LCA May 25, 19:10 UTCMay 25, 19:30 UTC20m
2026-05-25 AIZ286 PRG → TLV May 25, 11:45 UTCMay 25, 15:20 UTC3h 35m
2026-05-25 AIZ285 TLV → PRG May 25, 06:45 UTCMay 25, 10:15 UTC3h 30m
2026-05-24 AIZ54 CFU → TLV May 24, 21:30 UTCMay 24, 23:30 UTC2h 0m
2026-05-24 AIZ53 TLV → CFU May 24, 17:40 UTCMay 24, 19:40 UTC2h 0m
2026-05-24 AIZ1362 - May 24, 13:45 UTCMay 24, 16:15 UTC2h 30m
2026-05-24 AIZ1361 TLV → RZE May 24, 09:05 UTCMay 24, 11:35 UTC2h 30m
2026-05-23 AIZ1282 PRG → TLV May 23, 23:45 UTCMay 24, 03:15 UTC3h 30m
2026-05-22 AIZ283 TLV → PRG May 22, 04:25 UTCMay 22, 07:55 UTC3h 30m
2026-05-21 AIZ54 CFU → TLV May 21, 17:00 UTCMay 21, 18:50 UTC1h 50m
2026-05-21 AIZ53 TLV → CFU May 21, 13:20 UTCMay 21, 15:15 UTC1h 55m
2026-05-21 AIZ91 TLV → HER May 21, 06:15 UTCMay 21, 10:55 UTC4h 40m
2026-05-20 AIZ284 PRG → TLV May 20, 19:55 UTCMay 20, 23:15 UTC3h 20m
2026-05-20 AIZ283 TLV → PRG May 20, 14:40 UTCMay 20, 18:15 UTC3h 35m
2026-05-20 AIZ424 VIE → TLV May 20, 09:50 UTCMay 20, 13:00 UTC3h 10m
2026-05-20 AIZ423 TLV → VIE May 20, 04:20 UTCMay 20, 07:30 UTC3h 11m
2026-05-19 AIZ1162 LCA → TLV May 19, 17:55 UTCMay 19, 18:40 UTC45m
2026-05-19 AIZ161 TLV → LCA May 19, 13:35 UTCMay 19, 14:15 UTC40m

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 YR-LIA page for operator, model, and routing details .

Mode-S 4A3121 frequently asked

What is Mode-S code 4A3121?
4A3121 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-LIA.
Where is Mode-S 4A3121 registered?
Mode-S code 4A3121 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A3121 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A3121, octal 22430441, decimal 4,862,241.
What flights does 4A3121 operate?
Mode-S 4A3121 has broadcast 20 distinct callsigns, including AIZ425, AIZ426, AIZ367, AIZ368, AIZ827.