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 Jul 26, 21:05 UTC
Flights observed
342
Distinct callsigns
20
Country
RO
Last broadcast
Jul 26, 21:05 UTC

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
AIZ912 Arkia Israel Airlines 14 2026-07-26
AIZ911 Arkia Israel Airlines 14 2026-07-26
AIZ367 Arkia Israel Airlines 11 2026-07-21
AIZ368 - 10 2026-07-21
AIZ425 - 8 2026-04-20
AIZ426 - 7 2026-04-20
AIZ263 Arkia Israel Airlines 7 2026-07-23
AIZ54 - 6 2026-06-29
AIZ53 - 6 2026-06-29
AIZ417 - 6 2026-07-11
AIZ283 - 6 2026-06-24
AIZ424 - 5 2026-06-24
AIZ423 - 5 2026-06-24
AIZ418 - 5 2026-07-11
AIZ411 Arkia Israel Airlines 5 2026-07-24
AIZ364 Arkia Israel Airlines 5 2026-06-23
AIZ284 - 5 2026-06-24
AIZ264 Arkia Israel Airlines 5 2026-07-23
AIZ212 - 5 2026-07-10
AIZ211 - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AIZ912 LTN → TLV Jul 26, 16:40 UTCJul 26, 21:00 UTC4h 20m
2026-07-26 AIZ911 TLV → LTN Jul 26, 10:05 UTCJul 26, 15:15 UTC5h 10m
2026-07-26 AIZ122 - Jul 26, 05:10 UTCJul 26, 06:35 UTC1h 26m
2026-07-26 AIZ121 TLV → JMK Jul 26, 02:35 UTCJul 26, 04:00 UTC1h 25m
2026-07-25 AIZ912 LTN → TLV Jul 25, 17:25 UTCJul 25, 21:40 UTC4h 15m
2026-07-25 AIZ911 TLV → LTN Jul 25, 10:25 UTCJul 25, 15:10 UTC4h 45m
2026-07-25 AIZ166 LCA → TLV Jul 25, 07:45 UTCJul 25, 08:25 UTC40m
2026-07-25 AIZ165 TLV → LCA Jul 25, 05:45 UTCJul 25, 06:20 UTC35m
2026-07-25 AIZ1412 TIA → TLV Jul 25, 02:20 UTCJul 25, 04:20 UTC2h 0m
2026-07-24 AIZ411 TLV → TIA Jul 24, 22:20 UTCJul 25, 00:35 UTC2h 15m
2026-07-24 AIZ56 CFU → TLV Jul 24, 13:15 UTCJul 24, 15:05 UTC1h 50m
2026-07-24 AIZ55 TLV → CFU Jul 24, 09:50 UTCJul 24, 11:45 UTC1h 55m
2026-07-24 AIZ1166 LCA → TLV Jul 24, 06:25 UTCJul 24, 07:10 UTC45m
2026-07-24 AIZ1165 TLV → LCA Jul 24, 04:25 UTCJul 24, 05:05 UTC40m
2026-07-23 AIZ264 IBZ → TLV Jul 23, 22:55 UTCJul 24, 02:25 UTC3h 30m
2026-07-23 AIZ263 TLV → IBZ Jul 23, 17:00 UTCJul 23, 21:35 UTC4h 35m
2026-07-23 AIZ412 TIA → TLV Jul 23, 13:05 UTCJul 23, 15:05 UTC2h 0m
2026-07-23 AIZ411 TLV → TIA Jul 23, 08:35 UTCJul 23, 10:45 UTC2h 10m
2026-07-23 AIZ802 - Jul 23, 05:35 UTCJul 23, 06:10 UTC35m
2026-07-23 AIZ801 TLV → ETM Jul 23, 03:55 UTCJul 23, 04:15 UTC20m
2026-07-22 AIZ912 - Jul 22, 18:55 UTCJul 22, 22:55 UTC4h 0m
2026-07-22 AIZ911 TLV → STN Jul 22, 12:15 UTCJul 22, 17:20 UTC5h 5m
2026-07-22 AIZ55 TLV → CFU Jul 22, 04:35 UTCJul 22, 05:25 UTC50m
2026-07-21 AIZ052 CFU → TLV Jul 21, 20:50 UTCJul 21, 22:45 UTC1h 55m
2026-07-21 AIZ051 TLV → CFU Jul 21, 16:50 UTCJul 21, 18:40 UTC1h 50m
2026-07-21 AIZ122 JMK → TLV Jul 21, 13:40 UTCJul 21, 15:10 UTC1h 30m
2026-07-21 AIZ121 TLV → JMK Jul 21, 11:05 UTCJul 21, 12:35 UTC1h 30m
2026-07-21 AIZ368 - Jul 21, 06:20 UTCJul 21, 08:45 UTC2h 25m
2026-07-21 AIZ367 SOF → VAR Jul 21, 02:05 UTCJul 21, 04:15 UTC2h 10m
2026-07-20 AIZ912 - Jul 20, 17:10 UTCJul 20, 21:25 UTC4h 15m
2026-07-20 AIZ911 TLV → STN Jul 20, 10:05 UTCJul 20, 15:10 UTC5h 5m
2026-07-20 AIZ166 LCA → TLV Jul 20, 07:25 UTCJul 20, 08:00 UTC35m
2026-07-20 AIZ165 - Jul 20, 05:30 UTCJul 20, 06:15 UTC45m
2026-07-19 AIZ264 IBZ → TLV Jul 19, 21:25 UTCJul 20, 01:10 UTC3h 45m
2026-07-19 AIZ263 TLV → IBZ Jul 19, 15:30 UTCJul 19, 19:40 UTC4h 10m
2026-07-19 AIZ338 MXP → TLV Jul 19, 07:25 UTCJul 19, 10:55 UTC3h 30m
2026-07-19 AIZ337 TLV → MXP Jul 19, 01:45 UTCJul 19, 05:20 UTC3h 35m
2026-07-18 AIZ912 - Jul 18, 18:10 UTCJul 18, 22:35 UTC4h 25m
2026-07-18 AIZ911 TLV → STN Jul 18, 11:35 UTCJul 18, 16:35 UTC5h 0m
2026-07-18 AIZ1364 - Jul 18, 06:25 UTCJul 18, 08:50 UTC2h 25m
2026-07-18 AIZ1363 TLV → SOF Jul 18, 02:14 UTCJul 18, 04:55 UTC2h 41m
2026-07-17 AIZ2550 VNO → TLV Jul 17, 17:30 UTCJul 17, 21:05 UTC3h 35m
2026-07-17 AIZ2549 TLV → VNO Jul 17, 12:15 UTCJul 17, 16:04 UTC3h 50m
2026-07-17 AIZ152 - Jul 17, 09:50 UTCJul 17, 10:35 UTC45m
2026-07-17 AIZ151 TLV → PFO Jul 17, 07:55 UTCJul 17, 08:40 UTC45m
2026-07-16 AIZ912 - Jul 16, 18:19 UTCJul 16, 22:40 UTC4h 20m
2026-07-16 AIZ911 TLV → STN Jul 16, 10:00 UTCJul 16, 15:10 UTC5h 10m
2026-07-15 AIZ1224 SKG → TLV Jul 15, 20:30 UTCJul 15, 22:20 UTC1h 50m
2026-07-15 AIZ1223 TLV → SKG Jul 15, 17:15 UTCJul 15, 19:25 UTC2h 10m
2026-07-15 AIZ442 MUC → TLV Jul 15, 11:55 UTCJul 15, 15:10 UTC3h 15m

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 Jul 26, 21:05 UTC.
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 AIZ912, AIZ911, AIZ367, AIZ368, AIZ425.