Apparatus

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sensors Mode-S transponder

A18858

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N19804 · CESSNA 172 Skyhawk · operated by CM3 LLC

Hex
A18858
Octal
50304130
Decimal
10,586,200
Country
US
Tail
N19804
Type
C172
No current signal · last broadcast 1h ago
Flights observed
106
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A18858.

Country allocation

The ICAO 24-bit address A18858 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
N19804 - 106 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 N19804 - Jun 2, 19:20 UTCJun 2, 19:55 UTC35m
2026-06-02 N19804 VGT → VGT Jun 2, 18:25 UTCJun 2, 19:15 UTC50m
2026-06-01 N19804 VGT → VGT Jun 1, 23:10 UTCJun 2, 00:30 UTC1h 20m
2026-06-01 N19804 - Jun 1, 20:40 UTCJun 1, 21:35 UTC55m
2026-06-01 N19804 VGT → VGT Jun 1, 20:00 UTCJun 1, 20:25 UTC25m
2026-06-01 N19804 VGT → VGT Jun 1, 19:50 UTCJun 1, 19:55 UTC5m
2026-05-31 N19804 VGT → VGT May 31, 20:50 UTCMay 31, 21:50 UTC1h 0m
2026-05-31 N19804 - May 31, 16:20 UTCMay 31, 17:00 UTC40m
2026-05-31 N19804 - May 31, 14:45 UTCMay 31, 15:35 UTC50m
2026-05-30 N19804 HII → VGT May 30, 21:50 UTCMay 30, 23:30 UTC1h 40m
2026-05-30 N19804 VGT → HII May 30, 18:10 UTCMay 30, 19:55 UTC1h 45m
2026-05-30 N19804 VGT → VGT May 30, 13:50 UTCMay 30, 14:45 UTC55m
2026-05-29 N19804 VGT → VGT May 29, 18:45 UTCMay 29, 19:45 UTC1h 0m
2026-05-29 N19804 VGT → VGT May 29, 16:30 UTCMay 29, 17:15 UTC45m
2026-05-29 N19804 VGT → VGT May 29, 14:20 UTCMay 29, 15:15 UTC55m
2026-05-29 N19804 - May 29, 14:05 UTCMay 29, 14:10 UTC5m
2026-05-28 N19804 VGT → VGT May 28, 19:50 UTCMay 28, 21:00 UTC1h 10m
2026-05-28 N19804 VGT → VGT May 28, 18:40 UTCMay 28, 19:00 UTC20m
2026-05-28 N19804 VGT → VGT May 28, 18:20 UTCMay 28, 18:25 UTC5m
2026-05-28 N19804 VGT → VGT May 28, 13:45 UTCMay 28, 14:30 UTC45m
2026-05-24 N19804 VGT → VGT May 24, 18:10 UTCMay 24, 18:35 UTC25m
2026-05-23 N19804 - May 23, 14:55 UTCMay 23, 15:45 UTC50m
2026-05-23 N19804 VGT → VGT May 23, 14:40 UTCMay 23, 14:50 UTC10m
2026-05-22 N19804 - May 22, 21:05 UTCMay 22, 21:55 UTC50m
2026-05-22 N19804 VGT → VGT May 22, 14:50 UTCMay 22, 15:05 UTC15m
2026-05-21 N19804 VGT → VGT May 21, 20:25 UTCMay 21, 21:45 UTC1h 20m
2026-05-21 N19804 - May 21, 18:45 UTCMay 21, 19:45 UTC1h 0m
2026-05-21 N19804 VGT → VGT May 21, 16:50 UTCMay 21, 17:20 UTC30m
2026-05-21 N19804 VGT → VGT May 21, 14:15 UTCMay 21, 15:40 UTC1h 25m
2026-05-20 N19804 VGT → VGT May 20, 19:50 UTCMay 20, 20:25 UTC35m
2026-05-20 N19804 VGT → VGT May 20, 16:40 UTCMay 20, 16:55 UTC15m
2026-05-20 N19804 VGT → VGT May 20, 16:10 UTCMay 20, 16:35 UTC25m
2026-05-18 N19804 VGT → VGT May 18, 14:40 UTCMay 18, 15:25 UTC45m
2026-05-16 N19804 VGT → VGT May 16, 15:20 UTCMay 16, 16:20 UTC1h 0m
2026-05-15 N19804 - May 15, 18:05 UTCMay 15, 18:55 UTC50m
2026-05-15 N19804 VGT → VGT May 15, 16:05 UTCMay 15, 16:50 UTC45m
2026-05-15 N19804 VGT → VGT May 15, 04:55 UTCMay 15, 06:40 UTC1h 45m
2026-05-14 N19804 VGT → VGT May 14, 17:05 UTCMay 14, 17:55 UTC50m
2026-05-14 N19804 - May 14, 14:35 UTCMay 14, 15:45 UTC1h 10m
2026-05-13 N19804 VGT → VGT May 13, 17:30 UTCMay 13, 17:55 UTC25m
2026-05-12 N19804 - May 12, 20:35 UTCMay 12, 21:15 UTC40m
2026-05-12 N19804 - May 12, 18:10 UTCMay 12, 18:50 UTC40m
2026-05-12 N19804 VGT → VGT May 12, 15:50 UTCMay 12, 16:45 UTC55m
2026-05-11 N19804 - May 11, 21:45 UTCMay 11, 22:15 UTC30m
2026-05-09 N19804 VGT → VGT May 9, 19:40 UTCMay 9, 20:55 UTC1h 15m
2026-05-08 N19804 VGT → VGT May 8, 19:45 UTCMay 8, 20:20 UTC35m
2026-05-08 N19804 VGT → VGT May 8, 18:00 UTCMay 8, 18:45 UTC45m
2026-05-08 N19804 - May 8, 12:25 UTCMay 8, 13:35 UTC1h 10m
2026-05-08 N19804 VGT → VGT May 8, 00:25 UTCMay 8, 01:45 UTC1h 20m
2026-05-07 N19804 - May 7, 17:55 UTCMay 7, 18:40 UTC45m

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.

Prefer a tail-number view? See the N19804 page for operator, model, and routing details .

Mode-S A18858 frequently asked

What is Mode-S code A18858?
A18858 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N19804.
Where is Mode-S A18858 registered?
Mode-S code A18858 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 A18858 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 A18858, octal 50304130, decimal 10,586,200.
What flights does A18858 operate?
Mode-S A18858 has broadcast 1 distinct callsign, including N19804.