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sensors Mode-S transponder

A4AD27

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N400FJ · GULFSTREAM 4 · operated by PTJ ASSOCIATES LLC

Hex
A4AD27
Octal
51126447
Decimal
10,792,231
Country
US
Tail
N400FJ
Type
GLF4
Broadcasting now · callsign N400FJ · 11,750 ft
Flights observed
103
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Current position

A4AD27 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4AD27 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
N400FJ - 103 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N400FJ - Jul 12, 14:50 UTCJul 12, 16:10 UTC1h 20m
2026-07-12 N400FJ - Jul 12, 12:01 UTCJul 12, 13:25 UTC1h 25m
2026-07-11 N400FJ - Jul 11, 17:15 UTCJul 11, 18:25 UTC1h 10m
2026-07-11 N400FJ - Jul 11, 13:45 UTCJul 11, 15:05 UTC1h 20m
2026-07-09 N400FJ BED → TEB Jul 9, 04:40 UTCJul 9, 05:25 UTC45m
2026-07-08 N400FJ - Jul 8, 22:15 UTCJul 8, 23:00 UTC45m
2026-07-08 N400FJ BOS → TEB Jul 8, 00:15 UTCJul 8, 01:10 UTC55m
2026-07-07 N400FJ TEB → BOS Jul 7, 11:30 UTCJul 7, 12:05 UTC35m
2026-07-06 N400FJ EWR → TEB Jul 6, 19:45 UTCJul 6, 20:00 UTC15m
2026-07-06 N400FJ YUL → EWR Jul 6, 07:15 UTCJul 6, 08:15 UTC1h 0m
2026-07-05 N400FJ YYZ → YUL Jul 5, 22:25 UTCJul 5, 23:20 UTC55m
2026-07-04 N400FJ - Jul 4, 16:30 UTCJul 4, 16:40 UTC10m
2026-07-02 N400FJ - Jul 2, 04:55 UTCJul 2, 05:35 UTC40m
2026-07-01 N400FJ - Jul 1, 21:05 UTCJul 1, 21:45 UTC40m
2026-07-01 N400FJ - Jul 1, 04:45 UTCJul 1, 05:45 UTC1h 0m
2026-06-30 N400FJ - Jun 30, 20:10 UTCJun 30, 21:10 UTC1h 0m
2026-06-29 N400FJ - Jun 29, 18:10 UTCJun 29, 19:29 UTC1h 20m
2026-06-29 N400FJ - Jun 29, 13:09 UTCJun 29, 17:10 UTC4h 0m
2026-06-28 N400FJ - Jun 28, 21:50 UTCJun 28, 23:14 UTC1h 25m
2026-06-28 N400FJ - Jun 28, 16:35 UTCJun 28, 20:54 UTC4h 20m
2026-06-26 N400FJ - Jun 26, 22:40 UTCJun 27, 02:59 UTC4h 20m
2026-06-26 N400FJ - Jun 26, 17:50 UTCJun 26, 21:35 UTC3h 45m
2026-06-26 N400FJ - Jun 26, 01:39 UTCJun 26, 02:20 UTC40m
2026-06-25 N400FJ - Jun 25, 22:29 UTCJun 26, 00:59 UTC2h 30m
2026-06-25 N400FJ - Jun 25, 19:29 UTCJun 25, 21:40 UTC2h 10m
2026-06-25 N400FJ STP → MDW Jun 25, 06:09 UTCJun 25, 07:15 UTC1h 5m
2026-06-25 N400FJ - Jun 25, 00:19 UTCJun 25, 01:44 UTC1h 25m
2026-06-24 N400FJ - Jun 24, 02:24 UTCJun 24, 04:34 UTC2h 10m
2026-06-24 N400FJ - Jun 24, 00:34 UTCJun 24, 01:24 UTC50m
2026-06-23 N400FJ SJC → BWI Jun 23, 19:24 UTCJun 23, 23:59 UTC4h 35m
2026-06-23 N400FJ - Jun 23, 04:00 UTCJun 23, 04:19 UTC20m
2026-06-22 N400FJ - Jun 22, 22:44 UTCJun 23, 03:20 UTC4h 35m
2026-06-22 N400FJ STP → MDW Jun 22, 04:59 UTCJun 22, 06:00 UTC1h 0m
2026-06-21 N400FJ - Jun 21, 21:44 UTCJun 21, 22:44 UTC1h 0m
2026-06-19 N400FJ YYZ → MDW Jun 19, 04:29 UTCJun 19, 05:45 UTC1h 15m
2026-06-18 N400FJ - Jun 18, 18:45 UTCJun 18, 19:50 UTC1h 5m
2026-06-17 N400FJ FSD → MDW Jun 17, 04:30 UTCJun 17, 05:40 UTC1h 10m
2026-06-16 N400FJ - Jun 16, 19:45 UTCJun 16, 20:55 UTC1h 11m
2026-06-15 N400FJ VNY → MDW Jun 15, 04:50 UTCJun 15, 08:10 UTC3h 20m
2026-06-13 N400FJ PHX → VNY Jun 13, 05:00 UTCJun 13, 05:55 UTC55m
2026-06-12 N400FJ - Jun 12, 05:30 UTCJun 12, 07:00 UTC1h 30m
2026-06-11 N400FJ APA → SJC Jun 11, 21:15 UTCJun 11, 23:25 UTC2h 10m
2026-06-10 N400FJ - Jun 10, 21:20 UTCJun 10, 22:50 UTC1h 30m
2026-06-10 N400FJ - Jun 10, 15:45 UTCJun 10, 20:45 UTC5h 0m
2026-06-09 N400FJ - Jun 9, 04:00 UTCJun 9, 04:50 UTC50m
2026-06-08 N400FJ - Jun 8, 21:05 UTCJun 8, 22:30 UTC1h 25m
2026-06-07 N400FJ - Jun 7, 05:20 UTCJun 7, 05:50 UTC30m
2026-06-06 N400FJ - Jun 6, 21:04 UTCJun 6, 21:44 UTC40m
2026-06-05 N400FJ - Jun 5, 22:20 UTCJun 6, 00:05 UTC1h 45m
2026-06-03 N400FJ VNY → TUS Jun 3, 22:15 UTCJun 3, 23:25 UTC1h 10m

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 N400FJ page for operator, model, and routing details .

Mode-S A4AD27 frequently asked

What is Mode-S code A4AD27?
A4AD27 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N400FJ.
Where is Mode-S A4AD27 registered?
Mode-S code A4AD27 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 A4AD27 broadcasting right now?
Yes. Mode-S A4AD27 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4AD27, octal 51126447, decimal 10,792,231.
What flights does A4AD27 operate?
Mode-S A4AD27 has broadcast 1 distinct callsign, including N400FJ.