Apparatus

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sensors Mode-S transponder

A2CD99

ICAO 24-bit transponder address · allocated to United States

Hex
A2CD99
Octal
50546631
Decimal
10,669,465
Country
US
No current signal · last broadcast 8h ago
Flights observed
61
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A2CD99.

Country allocation

The ICAO 24-bit address A2CD99 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
WCC28 - 61 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 WCC28 - Jul 14, 02:05 UTCJul 14, 02:25 UTC20m
2026-07-14 WCC28 - Jul 14, 00:05 UTCJul 14, 01:20 UTC1h 15m
2026-07-13 WCC28 - Jul 13, 20:50 UTCJul 13, 23:00 UTC2h 10m
2026-07-13 WCC28 - Jul 13, 01:05 UTCJul 13, 02:40 UTC1h 35m
2026-07-12 WCC28 - Jul 12, 22:35 UTCJul 12, 23:20 UTC45m
2026-07-12 WCC28 - Jul 12, 20:30 UTCJul 12, 21:15 UTC45m
2026-07-12 WCC28 - Jul 12, 18:40 UTCJul 12, 19:40 UTC1h 0m
2026-07-12 WCC28 - Jul 12, 00:10 UTCJul 12, 00:30 UTC20m
2026-07-11 WCC28 - Jul 11, 21:15 UTCJul 11, 23:15 UTC2h 0m
2026-07-10 WCC28 - Jul 10, 23:25 UTCJul 11, 00:15 UTC50m
2026-07-10 WCC28 - Jul 10, 22:05 UTCJul 10, 22:45 UTC40m
2026-07-10 WCC28 - Jul 10, 18:00 UTCJul 10, 18:15 UTC15m
2026-07-10 WCC28 - Jul 10, 16:40 UTCJul 10, 17:20 UTC40m
2026-07-10 WCC28 - Jul 10, 14:20 UTCJul 10, 15:55 UTC1h 35m
2026-07-09 WCC28 - Jul 9, 23:30 UTCJul 10, 00:55 UTC1h 25m
2026-07-09 WCC28 - Jul 9, 21:30 UTCJul 9, 23:00 UTC1h 30m
2026-07-08 WCC28 - Jul 8, 20:45 UTCJul 8, 22:55 UTC2h 10m
2026-07-08 WCC28 - Jul 8, 17:40 UTCJul 8, 19:35 UTC1h 55m
2026-07-05 WCC28 - Jul 5, 18:25 UTCJul 5, 21:55 UTC3h 30m
2026-07-01 WCC28 - Jul 1, 15:20 UTCJul 1, 17:00 UTC1h 40m
2026-07-01 WCC28 - Jul 1, 13:50 UTCJul 1, 14:40 UTC50m
2026-06-28 WCC28 - Jun 28, 20:29 UTCJun 28, 23:04 UTC2h 35m
2026-06-26 WCC28 - Jun 26, 19:20 UTCJun 26, 19:55 UTC35m
2026-06-26 WCC28 - Jun 26, 16:09 UTCJun 26, 17:15 UTC1h 5m
2026-06-26 WCC28 - Jun 26, 02:50 UTCJun 26, 04:59 UTC2h 10m
2026-06-25 WCC28 - Jun 25, 23:34 UTCJun 26, 02:00 UTC2h 25m
2026-06-22 WCC28 - Jun 22, 01:29 UTCJun 22, 01:40 UTC10m
2026-06-21 WCC28 - Jun 21, 16:30 UTCJun 22, 01:00 UTC8h 30m
2026-06-20 WCC28 - Jun 20, 20:29 UTCJun 20, 22:20 UTC1h 50m
2026-06-20 WCC28 - Jun 20, 18:49 UTCJun 20, 19:34 UTC45m
2026-06-20 WCC28 - Jun 20, 16:14 UTCJun 20, 17:49 UTC1h 35m
2026-06-20 WCC28 - Jun 20, 14:24 UTCJun 20, 15:04 UTC40m
2026-06-18 WCC28 - Jun 18, 20:10 UTCJun 18, 21:25 UTC1h 15m
2026-06-16 WCC28 - Jun 16, 17:05 UTCJun 16, 18:25 UTC1h 20m
2026-06-16 WCC28 PHX → SNA Jun 16, 03:00 UTCJun 16, 04:10 UTC1h 10m
2026-06-15 WCC28 - Jun 15, 19:14 UTCJun 15, 20:40 UTC1h 25m
2026-06-13 WCC28 - Jun 13, 18:50 UTCJun 13, 20:05 UTC1h 15m
2026-06-13 WCC28 - Jun 13, 15:50 UTCJun 13, 18:05 UTC2h 15m
2026-06-10 WCC28 - Jun 10, 23:05 UTCJun 10, 23:25 UTC20m
2026-06-10 WCC28 - Jun 10, 19:10 UTCJun 10, 22:20 UTC3h 10m
2026-06-10 WCC28 - Jun 10, 17:00 UTCJun 10, 17:35 UTC35m
2026-06-07 WCC28 VGT → TUS Jun 7, 18:35 UTCJun 7, 19:50 UTC1h 15m
2026-06-06 WCC28 - Jun 6, 17:34 UTCJun 6, 18:45 UTC1h 10m
2026-06-06 WCC28 - Jun 6, 15:44 UTCJun 6, 16:50 UTC1h 5m
2026-06-05 WCC28 - Jun 5, 19:15 UTCJun 5, 19:45 UTC30m
2026-06-05 WCC28 - Jun 5, 05:35 UTCJun 5, 06:35 UTC1h 0m
2026-06-04 WCC28 - Jun 4, 22:10 UTCJun 4, 23:20 UTC1h 10m
2026-06-04 WCC28 - Jun 4, 19:35 UTCJun 4, 20:00 UTC25m
2026-06-03 WCC28 - Jun 3, 23:45 UTCJun 4, 00:10 UTC25m
2026-06-03 WCC28 - Jun 3, 22:00 UTCJun 3, 23:15 UTC1h 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.

Mode-S A2CD99 frequently asked

What is Mode-S code A2CD99?
A2CD99 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A2CD99 registered?
Mode-S code A2CD99 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 A2CD99 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CD99, octal 50546631, decimal 10,669,465.
What flights does A2CD99 operate?
Mode-S A2CD99 has broadcast 1 distinct callsign, including WCC28.