Apparatus

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sensors Mode-S transponder

A4EE99

ICAO 24-bit transponder address · allocated to United States

Hex
A4EE99
Octal
51167231
Decimal
10,808,985
Country
US
No current signal · last broadcast 1h ago
Flights observed
114
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A4EE99.

Country allocation

The ICAO 24-bit address A4EE99 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
N417EV - 114 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N417EV - Jul 14, 16:00 UTCJul 14, 16:15 UTC15m
2026-07-13 N417EV - Jul 13, 23:25 UTCJul 13, 23:50 UTC25m
2026-07-11 N417EV - Jul 11, 16:00 UTCJul 11, 16:15 UTC15m
2026-07-10 N417EV - Jul 10, 19:20 UTCJul 10, 19:30 UTC10m
2026-07-10 N417EV - Jul 10, 17:50 UTCJul 10, 18:15 UTC25m
2026-07-10 N417EV - Jul 10, 11:05 UTCJul 10, 12:35 UTC1h 30m
2026-07-10 N417EV - Jul 10, 00:35 UTCJul 10, 01:00 UTC25m
2026-07-09 N417EV - Jul 9, 23:40 UTCJul 10, 00:00 UTC20m
2026-07-09 N417EV - Jul 9, 22:25 UTCJul 9, 22:40 UTC15m
2026-07-09 N417EV - Jul 9, 20:45 UTCJul 9, 20:55 UTC10m
2026-07-09 N417EV - Jul 9, 18:25 UTCJul 9, 19:00 UTC35m
2026-07-09 N417EV - Jul 9, 15:50 UTCJul 9, 16:05 UTC15m
2026-07-09 N417EV - Jul 9, 14:35 UTCJul 9, 14:55 UTC20m
2026-07-08 N417EV - Jul 8, 22:35 UTCJul 8, 23:00 UTC25m
2026-07-08 N417EV - Jul 8, 19:50 UTCJul 8, 20:35 UTC45m
2026-07-08 N417EV - Jul 8, 17:40 UTCJul 8, 18:15 UTC35m
2026-07-08 N417EV - Jul 8, 14:40 UTCJul 8, 14:55 UTC15m
2026-07-07 N417EV - Jul 7, 15:10 UTCJul 7, 15:35 UTC25m
2026-07-06 N417EV - Jul 6, 18:25 UTCJul 6, 18:35 UTC10m
2026-07-06 N417EV - Jul 6, 13:10 UTCJul 6, 13:20 UTC10m
2026-07-03 N417EV - Jul 3, 22:05 UTCJul 3, 22:25 UTC20m
2026-07-03 N417EV - Jul 3, 16:35 UTCJul 3, 16:50 UTC15m
2026-07-03 N417EV - Jul 3, 12:10 UTCJul 3, 12:40 UTC30m
2026-07-02 N417EV - Jul 2, 22:35 UTCJul 2, 22:45 UTC10m
2026-07-02 N417EV - Jul 2, 17:00 UTCJul 2, 17:15 UTC15m
2026-07-02 N417EV - Jul 2, 15:10 UTCJul 2, 15:45 UTC35m
2026-07-02 N417EV - Jul 2, 05:35 UTCJul 2, 05:50 UTC15m
2026-07-02 N417EV - Jul 2, 02:30 UTCJul 2, 04:30 UTC2h 0m
2026-07-02 N417EV - Jul 2, 00:40 UTCJul 2, 00:55 UTC15m
2026-06-28 N417EV - Jun 28, 16:35 UTCJun 28, 17:00 UTC25m
2026-06-27 N417EV - Jun 27, 22:04 UTCJun 27, 22:20 UTC15m
2026-06-27 N417EV - Jun 27, 14:39 UTCJun 27, 15:00 UTC20m
2026-06-27 N417EV - Jun 27, 12:34 UTCJun 27, 14:00 UTC1h 25m
2026-06-26 N417EV - Jun 26, 23:34 UTCJun 27, 00:10 UTC35m
2026-06-26 N417EV - Jun 26, 21:15 UTCJun 26, 21:35 UTC20m
2026-06-26 N417EV - Jun 26, 19:45 UTCJun 26, 20:04 UTC20m
2026-06-26 N417EV - Jun 26, 18:04 UTCJun 26, 19:14 UTC1h 10m
2026-06-26 N417EV - Jun 26, 15:54 UTCJun 26, 16:14 UTC20m
2026-06-25 N417EV - Jun 25, 20:09 UTCJun 25, 20:19 UTC10m
2026-06-25 N417EV - Jun 25, 18:04 UTCJun 25, 18:24 UTC20m
2026-06-25 N417EV - Jun 25, 16:14 UTCJun 25, 16:24 UTC10m
2026-06-25 N417EV - Jun 25, 13:55 UTCJun 25, 14:09 UTC15m
2026-06-24 N417EV - Jun 24, 18:20 UTCJun 24, 18:39 UTC20m
2026-06-24 N417EV - Jun 24, 15:44 UTCJun 24, 15:59 UTC15m
2026-06-23 N417EV - Jun 23, 17:09 UTCJun 23, 17:25 UTC15m
2026-06-23 N417EV - Jun 23, 15:59 UTCJun 23, 16:09 UTC10m
2026-06-19 N417EV - Jun 19, 21:39 UTCJun 19, 21:54 UTC15m
2026-06-19 N417EV - Jun 19, 16:55 UTCJun 19, 17:04 UTC10m
2026-06-19 N417EV - Jun 19, 15:44 UTCJun 19, 15:59 UTC15m
2026-06-13 N417EV - Jun 13, 12:55 UTCJun 13, 14:30 UTC1h 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 A4EE99 frequently asked

What is Mode-S code A4EE99?
A4EE99 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A4EE99 registered?
Mode-S code A4EE99 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 A4EE99 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4EE99, octal 51167231, decimal 10,808,985.
What flights does A4EE99 operate?
Mode-S A4EE99 has broadcast 1 distinct callsign, including N417EV.