sensors Mode-S transponder

4A2AAC

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-JUL · AIRBUS A-320

Hex
4A2AAC
Octal
22425254
Decimal
4,860,588
Country
RO
Tail
YR-JUL
Type
A320
Broadcasting now · callsign DNA508 · 33,025 ft
Flights observed
9
Distinct callsigns
7
Country
RO
Last broadcast
12h ago

Current position

4A2AAC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4A2AAC 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 7 distinct

Callsign Airline Flights Last seen
DNA422 - 2 2026-04-14
DNA401 - 2 2026-04-13
DNA507 - 1 2026-04-12
DNA405 - 1 2026-04-14
DNA404 - 1 2026-04-13
DNA403 - 1 2026-04-13
DNA402 - 1 2026-04-13

Recent flights last 9

DateFlightRouteTakeoffLandingDuration
2026-04-14 DNA405 - Apr 14, 09:50 UTCApr 14, 11:05 UTC1h 15m
2026-04-14 DNA422 - Apr 14, 07:10 UTCApr 14, 08:45 UTC1h 35m
2026-04-14 DNA422 - Apr 14, 06:55 UTCApr 14, 07:10 UTC15m
2026-04-13 DNA402 - Apr 13, 20:00 UTCApr 13, 20:10 UTC10m
2026-04-13 DNA401 - Apr 13, 16:15 UTCApr 13, 18:50 UTC2h 35m
2026-04-13 DNA401 - Apr 13, 16:00 UTCApr 13, 16:15 UTC15m
2026-04-13 DNA404 - Apr 13, 12:30 UTCApr 13, 14:50 UTC2h 20m
2026-04-13 DNA403 - Apr 13, 08:45 UTCApr 13, 11:05 UTC2h 20m
2026-04-12 DNA507 - Apr 12, 17:15 UTCApr 12, 19:30 UTC2h 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-JUL page for operator, model, and routing details .

Mode-S 4A2AAC frequently asked

What is Mode-S code 4A2AAC?
4A2AAC is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-JUL.
Where is Mode-S 4A2AAC registered?
Mode-S code 4A2AAC is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A2AAC broadcasting right now?
Yes. Mode-S 4A2AAC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A2AAC, octal 22425254, decimal 4,860,588.
What flights does 4A2AAC operate?
Mode-S 4A2AAC has broadcast 7 distinct callsigns, including DNA422, DNA401, DNA507, DNA405, DNA404.