Apparatus

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sensors Mode-S transponder

505ADB

ICAO 24-bit transponder address

Hex
505ADB
Octal
24055333
Decimal
5,266,139
No current signal · last broadcast Jul 13, 04:15 UTC
Flights observed
4
Distinct callsigns
1
Country
-
Last broadcast
Jul 13, 04:15 UTC

Last known position

Most recent position reported by Mode-S 505ADB.

Callsign history 1 distinct

Callsign Airline Flights Last seen
OMM946 - 4 2026-07-13

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-07-13 OMM946 - Jul 13, 03:10 UTCJul 13, 04:15 UTC1h 5m
2026-07-10 OMM946 - Jul 10, 13:15 UTCJul 10, 14:05 UTC50m
2026-06-22 OMM946 - Jun 22, 03:05 UTCJun 22, 04:15 UTC1h 10m
2026-06-19 OMM946 - Jun 19, 14:09 UTCJun 19, 15:04 UTC55m

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.

Mode-S 505ADB frequently asked

What is Mode-S code 505ADB?
505ADB is an ICAO 24-bit transponder address.
Is 505ADB broadcasting right now?
No active broadcast right now. Last signal was Jul 13, 04:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 505ADB, octal 24055333, decimal 5,266,139.
What flights does 505ADB operate?
Mode-S 505ADB has broadcast 1 distinct callsign, including OMM946.