sensors Mode-S transponder

503D6F

ICAO 24-bit transponder address · allocated to Lithuania

Currently assigned to LY-HMD · AIRBUS A-320

Hex
503D6F
Octal
24036557
Decimal
5,258,607
Country
LT
Tail
LY-HMD
Type
A320
Broadcasting now · callsign AHY035 · 34,000 ft
Flights observed
10
Distinct callsigns
4
Country
LT
Last broadcast
17h ago

Current position

503D6F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 503D6F falls within the block assigned to Lithuania (LT) by ICAO Annex 10, Volume III. Every aircraft registered in Lithuania 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 4 distinct

Callsign Airline Flights Last seen
AHY071 - 3 2026-04-14
AHY036 - 3 2026-04-13
AHY035 - 3 2026-04-13
AHY077 - 1 2026-04-12

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-14 AHY071 - Apr 14, 09:10 UTCApr 14, 10:00 UTC50m
2026-04-14 AHY071 - Apr 14, 07:10 UTCApr 14, 09:05 UTC1h 55m
2026-04-14 AHY071 - Apr 14, 06:05 UTCApr 14, 07:10 UTC1h 5m
2026-04-13 AHY036 - Apr 13, 12:55 UTCApr 13, 13:40 UTC45m
2026-04-13 AHY036 - Apr 13, 11:55 UTCApr 13, 13:40 UTC1h 45m
2026-04-13 AHY036 - Apr 13, 09:45 UTCApr 13, 12:00 UTC2h 15m
2026-04-13 AHY035 - Apr 13, 07:55 UTCApr 13, 08:15 UTC20m
2026-04-13 AHY035 - Apr 13, 04:20 UTCApr 13, 08:15 UTC3h 55m
2026-04-13 AHY035 - Apr 13, 03:45 UTCApr 13, 04:15 UTC30m
2026-04-12 AHY077 - Apr 12, 17:15 UTCApr 12, 17:30 UTC15m

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 LY-HMD page for operator, model, and routing details .

Mode-S 503D6F frequently asked

What is Mode-S code 503D6F?
503D6F is an ICAO 24-bit transponder address. Allocated to Lithuania. Assigned to LY-HMD.
Where is Mode-S 503D6F registered?
Mode-S code 503D6F is allocated to Lithuania (LT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 503D6F broadcasting right now?
Yes. Mode-S 503D6F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 503D6F, octal 24036557, decimal 5,258,607.
What flights does 503D6F operate?
Mode-S 503D6F has broadcast 4 distinct callsigns, including AHY071, AHY036, AHY035, AHY077.