Apparatus

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sensors Mode-S transponder

A188D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1984S · operated by VERTICAL AVIATION NO 1 LLC

Hex
A188D8
Octal
50304330
Decimal
10,586,328
Country
US
Tail
N1984S
Type
EC45
No current signal · last broadcast Jul 26, 08:20 UTC
Flights observed
229
Distinct callsigns
2
Country
US
Last broadcast
Jul 26, 08:20 UTC

Last known position

Most recent position reported by Mode-S A188D8.

Country allocation

The ICAO 24-bit address A188D8 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 2 distinct

Callsign Airline Flights Last seen
STNFORD1 - 163 2026-07-26
N1984S - 66 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 STNFORD1 PAO → PAO Jul 26, 07:50 UTCJul 26, 07:55 UTC5m
2026-07-26 STNFORD1 - Jul 26, 07:30 UTCJul 26, 07:40 UTC10m
2026-07-26 STNFORD1 - Jul 26, 05:55 UTCJul 26, 06:10 UTC15m
2026-07-25 STNFORD1 - Jul 25, 23:10 UTCJul 25, 23:20 UTC10m
2026-07-25 STNFORD1 - Jul 25, 20:45 UTCJul 25, 22:35 UTC1h 50m
2026-07-25 STNFORD1 - Jul 25, 18:30 UTCJul 25, 19:40 UTC1h 10m
2026-07-25 STNFORD1 - Jul 25, 02:50 UTCJul 25, 03:30 UTC40m
2026-07-24 STNFORD1 - Jul 24, 21:05 UTCJul 24, 21:20 UTC15m
2026-07-23 STNFORD1 - Jul 23, 14:05 UTCJul 23, 14:15 UTC10m
2026-07-23 STNFORD1 - Jul 23, 13:05 UTCJul 23, 13:15 UTC10m
2026-07-23 STNFORD1 - Jul 23, 03:25 UTCJul 23, 03:40 UTC15m
2026-07-23 STNFORD1 - Jul 23, 02:25 UTCJul 23, 02:35 UTC10m
2026-07-22 STNFORD1 - Jul 22, 23:20 UTCJul 22, 23:50 UTC30m
2026-07-21 STNFORD1 - Jul 21, 14:10 UTCJul 21, 14:25 UTC15m
2026-07-20 STNFORD1 - Jul 20, 20:30 UTCJul 20, 20:40 UTC10m
2026-07-19 STNFORD1 - Jul 19, 23:40 UTCJul 19, 23:50 UTC10m
2026-07-19 STNFORD1 - Jul 19, 21:40 UTCJul 19, 21:55 UTC15m
2026-07-19 STNFORD1 - Jul 19, 00:55 UTCJul 19, 01:15 UTC20m
2026-07-18 STNFORD1 - Jul 18, 23:55 UTCJul 19, 00:15 UTC20m
2026-07-17 STNFORD1 - Jul 17, 22:05 UTCJul 17, 22:49 UTC45m
2026-07-17 STNFORD1 - Jul 17, 15:10 UTCJul 17, 15:25 UTC15m
2026-07-15 STNFORD1 - Jul 15, 00:30 UTCJul 15, 00:40 UTC10m
2026-07-13 STNFORD1 - Jul 13, 23:05 UTCJul 14, 00:40 UTC1h 35m
2026-07-13 STNFORD1 - Jul 13, 18:10 UTCJul 13, 18:20 UTC10m
2026-07-13 STNFORD1 - Jul 13, 17:55 UTCJul 13, 18:05 UTC10m
2026-07-13 STNFORD1 - Jul 13, 17:10 UTCJul 13, 17:20 UTC10m
2026-07-13 STNFORD1 - Jul 13, 16:10 UTCJul 13, 16:15 UTC5m
2026-07-13 STNFORD1 - Jul 13, 15:15 UTCJul 13, 15:20 UTC5m
2026-07-13 STNFORD1 - Jul 13, 15:05 UTCJul 13, 15:10 UTC5m
2026-07-13 STNFORD1 - Jul 13, 03:10 UTCJul 13, 03:20 UTC10m
2026-07-13 STNFORD1 - Jul 13, 02:20 UTCJul 13, 02:35 UTC15m
2026-07-10 STNFORD1 - Jul 10, 21:35 UTCJul 10, 22:05 UTC30m
2026-07-10 STNFORD1 - Jul 10, 20:15 UTCJul 10, 20:50 UTC35m
2026-07-09 STNFORD1 - Jul 9, 18:05 UTCJul 9, 18:15 UTC10m
2026-07-09 STNFORD1 - Jul 9, 14:40 UTCJul 9, 14:55 UTC15m
2026-07-09 STNFORD1 - Jul 9, 12:30 UTCJul 9, 13:05 UTC35m
2026-07-09 STNFORD1 - Jul 9, 10:35 UTCJul 9, 11:20 UTC45m
2026-07-09 STNFORD1 - Jul 9, 00:30 UTCJul 9, 00:40 UTC10m
2026-07-08 STNFORD1 - Jul 8, 23:10 UTCJul 9, 00:10 UTC1h 0m
2026-07-08 STNFORD1 - Jul 8, 01:40 UTCJul 8, 01:55 UTC15m
2026-07-08 STNFORD1 - Jul 8, 00:55 UTCJul 8, 01:05 UTC10m
2026-07-07 STNFORD1 PAO → PAO Jul 7, 01:45 UTCJul 7, 01:50 UTC5m
2026-07-07 STNFORD1 - Jul 7, 01:10 UTCJul 7, 01:20 UTC10m
2026-07-07 STNFORD1 - Jul 7, 00:50 UTCJul 7, 01:00 UTC10m
2026-07-05 STNFORD1 - Jul 5, 00:15 UTCJul 5, 00:25 UTC10m
2026-07-04 STNFORD1 - Jul 4, 21:35 UTCJul 4, 22:00 UTC25m
2026-07-04 STNFORD1 - Jul 4, 08:50 UTCJul 4, 09:35 UTC45m
2026-07-04 STNFORD1 - Jul 4, 07:45 UTCJul 4, 07:55 UTC10m
2026-07-04 STNFORD1 - Jul 4, 06:45 UTCJul 4, 07:20 UTC35m
2026-07-02 STNFORD1 - Jul 2, 10:10 UTCJul 2, 10:20 UTC10m

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 N1984S page for operator, model, and routing details .

Mode-S A188D8 frequently asked

What is Mode-S code A188D8?
A188D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1984S.
Where is Mode-S A188D8 registered?
Mode-S code A188D8 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 A188D8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A188D8, octal 50304330, decimal 10,586,328.
What flights does A188D8 operate?
Mode-S A188D8 has broadcast 2 distinct callsigns, including STNFORD1, N1984S.