Apparatus

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sensors Mode-S transponder

A98AC5

ICAO 24-bit transponder address · allocated to United States

Hex
A98AC5
Octal
52305305
Decimal
11,111,109
Country
US
No current signal · last broadcast 1d ago
Flights observed
25
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A98AC5.

Country allocation

The ICAO 24-bit address A98AC5 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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 1 distinct

Callsign Airline Flights Last seen
UNIDENT - 25 2026-07-12

Recent flights last 25

DateFlightRouteTakeoffLandingDuration
2026-07-12 UNIDENT - Jul 12, 01:25 UTCJul 12, 19:15 UTC17h 50m
2026-07-03 UNIDENT - Jul 3, 18:15 UTCJul 4, 00:00 UTC5h 45m
2026-06-30 UNIDENT - Jun 30, 01:35 UTCJun 30, 20:55 UTC19h 20m
2026-06-26 UNIDENT - Jun 26, 23:49 UTCJun 27, 17:55 UTC18h 5m
2026-06-24 UNIDENT - Jun 24, 19:15 UTCJun 25, 03:50 UTC8h 35m
2026-06-21 UNIDENT - Jun 21, 18:39 UTCJun 22, 06:29 UTC11h 50m
2026-06-18 UNIDENT - Jun 18, 19:35 UTCJun 19, 13:09 UTC17h 34m
2026-06-15 UNIDENT - Jun 15, 02:30 UTCJun 15, 13:15 UTC10h 45m
2026-06-13 UNIDENT - Jun 13, 00:55 UTCJun 13, 01:05 UTC10m
2026-06-13 UNIDENT - Jun 13, 00:40 UTCJun 13, 00:45 UTC5m
2026-06-12 UNIDENT - Jun 12, 23:55 UTCJun 13, 00:10 UTC15m
2026-06-12 UNIDENT - Jun 12, 23:35 UTCJun 12, 23:40 UTC5m
2026-06-12 UNIDENT - Jun 12, 22:50 UTCJun 12, 22:55 UTC5m
2026-06-12 UNIDENT - Jun 12, 21:55 UTCJun 12, 22:00 UTC5m
2026-06-12 UNIDENT - Jun 12, 21:20 UTCJun 12, 21:25 UTC5m
2026-06-12 UNIDENT - Jun 12, 20:45 UTCJun 12, 20:50 UTC5m
2026-06-12 UNIDENT - Jun 12, 20:30 UTCJun 12, 20:35 UTC5m
2026-06-12 UNIDENT - Jun 12, 20:10 UTCJun 12, 20:15 UTC5m
2026-06-12 UNIDENT - Jun 12, 19:55 UTCJun 12, 20:05 UTC10m
2026-06-12 UNIDENT - Jun 12, 19:35 UTCJun 12, 19:40 UTC5m
2026-06-01 UNIDENT - Jun 1, 12:50 UTCJun 1, 15:45 UTC2h 55m
2026-05-29 UNIDENT - May 29, 01:20 UTCMay 29, 19:25 UTC18h 5m
2026-05-29 UNIDENT - May 29, 00:35 UTCMay 29, 19:25 UTC18h 50m
2026-05-22 UNIDENT - May 22, 20:30 UTCMay 23, 02:40 UTC6h 9m
2026-05-22 UNIDENT - May 22, 03:25 UTCMay 22, 06:00 UTC2h 35m

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 A98AC5 frequently asked

What is Mode-S code A98AC5?
A98AC5 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A98AC5 registered?
Mode-S code A98AC5 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A98AC5 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A98AC5, octal 52305305, decimal 11,111,109.
What flights does A98AC5 operate?
Mode-S A98AC5 has broadcast 1 distinct callsign, including UNIDENT.