Apparatus

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sensors Mode-S transponder

A20B3D

ICAO 24-bit transponder address · allocated to United States

Hex
A20B3D
Octal
50405475
Decimal
10,619,709
Country
US
No current signal · last broadcast Jul 9, 08:15 UTC
Flights observed
40
Distinct callsigns
1
Country
US
Last broadcast
Jul 9, 08:15 UTC

Last known position

Most recent position reported by Mode-S A20B3D.

Country allocation

The ICAO 24-bit address A20B3D 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
SERCE26 - 40 2026-07-09

Recent flights last 40

DateFlightRouteTakeoffLandingDuration
2026-07-09 SERCE26 - Jul 9, 07:10 UTCJul 9, 08:15 UTC1h 5m
2026-07-09 SERCE26 - Jul 9, 04:45 UTCJul 9, 05:05 UTC20m
2026-07-08 SERCE26 - Jul 8, 06:35 UTCJul 8, 07:40 UTC1h 5m
2026-07-07 SERCE26 - Jul 7, 06:20 UTCJul 7, 06:55 UTC35m
2026-07-07 SERCE26 - Jul 7, 04:10 UTCJul 7, 05:10 UTC1h 0m
2026-07-06 SERCE26 - Jul 6, 07:35 UTCJul 6, 07:55 UTC20m
2026-07-06 SERCE26 - Jul 6, 05:10 UTCJul 6, 06:05 UTC55m
2026-07-03 SERCE26 - Jul 3, 06:30 UTCJul 3, 06:40 UTC10m
2026-07-03 SERCE26 - Jul 3, 05:45 UTCJul 3, 06:20 UTC35m
2026-07-02 SERCE26 - Jul 2, 09:10 UTCJul 2, 10:10 UTC1h 0m
2026-07-02 SERCE26 - Jul 2, 07:25 UTCJul 2, 07:35 UTC10m
2026-07-02 SERCE26 - Jul 2, 06:41 UTCJul 2, 07:10 UTC29m
2026-07-01 SERCE26 - Jul 1, 08:05 UTCJul 1, 09:00 UTC55m
2026-07-01 SERCE26 - Jul 1, 06:25 UTCJul 1, 07:05 UTC40m
2026-06-30 SERCE26 - Jun 30, 08:10 UTCJun 30, 08:20 UTC10m
2026-06-30 SERCE26 - Jun 30, 07:15 UTCJun 30, 08:00 UTC45m
2026-06-29 SERCE26 - Jun 29, 07:25 UTCJun 29, 08:14 UTC50m
2026-06-25 SERCE26 - Jun 25, 07:30 UTCJun 25, 08:14 UTC45m
2026-06-25 SERCE26 - Jun 25, 06:00 UTCJun 25, 06:50 UTC50m
2026-06-24 SERCE26 - Jun 24, 08:09 UTCJun 24, 09:09 UTC1h 0m
2026-06-24 SERCE26 - Jun 24, 06:29 UTCJun 24, 07:24 UTC55m
2026-06-22 SERCE26 - Jun 22, 10:44 UTCJun 22, 11:04 UTC20m
2026-06-22 SERCE26 - Jun 22, 09:10 UTCJun 22, 09:45 UTC35m
2026-06-22 SERCE26 - Jun 22, 07:34 UTCJun 22, 08:29 UTC55m
2026-06-17 SERCE26 - Jun 17, 08:00 UTCJun 17, 08:35 UTC35m
2026-06-17 SERCE26 - Jun 17, 06:30 UTCJun 17, 07:15 UTC45m
2026-06-16 SERCE26 - Jun 16, 10:30 UTCJun 16, 11:15 UTC45m
2026-06-16 SERCE26 - Jun 16, 08:05 UTCJun 16, 08:44 UTC40m
2026-06-16 SERCE26 - Jun 16, 06:40 UTCJun 16, 07:15 UTC35m
2026-06-15 SERCE26 - Jun 15, 09:49 UTCJun 15, 10:30 UTC40m
2026-06-15 SERCE26 - Jun 15, 08:10 UTCJun 15, 09:10 UTC1h 0m
2026-06-10 SERCE26 - Jun 10, 08:50 UTCJun 10, 09:45 UTC55m
2026-06-10 SERCE26 - Jun 10, 07:05 UTCJun 10, 08:00 UTC55m
2026-06-09 SERCE26 - Jun 9, 09:45 UTCJun 9, 10:55 UTC1h 10m
2026-06-09 SERCE26 - Jun 9, 08:10 UTCJun 9, 09:10 UTC1h 0m
2026-06-04 SERCE26 - Jun 4, 09:50 UTCJun 4, 10:55 UTC1h 5m
2026-06-04 SERCE26 - Jun 4, 08:00 UTCJun 4, 09:05 UTC1h 5m
2026-06-03 SERCE26 - Jun 3, 09:35 UTCJun 3, 10:35 UTC1h 0m
2026-06-03 SERCE26 - Jun 3, 07:45 UTCJun 3, 08:30 UTC45m
2026-06-03 SERCE26 - Jun 3, 06:15 UTCJun 3, 06:50 UTC35m

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 A20B3D frequently asked

What is Mode-S code A20B3D?
A20B3D is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A20B3D registered?
Mode-S code A20B3D 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 A20B3D broadcasting right now?
No active broadcast right now. Last signal was Jul 9, 08:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A20B3D, octal 50405475, decimal 10,619,709.
What flights does A20B3D operate?
Mode-S A20B3D has broadcast 1 distinct callsign, including SERCE26.