Apparatus

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sensors Mode-S transponder

A8D261

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N668EM · GULFSTREAM 4 · operated by BANK OF UTAH TRUSTEE

Hex
A8D261
Octal
52151141
Decimal
11,063,905
Country
US
Tail
N668EM
Type
GLF4
No current signal · last broadcast Jul 23, 07:55 UTC
Flights observed
34
Distinct callsigns
1
Country
US
Last broadcast
Jul 23, 07:55 UTC

Last known position

Most recent position reported by Mode-S A8D261.

Country allocation

The ICAO 24-bit address A8D261 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
N668EM - 34 2026-07-23

Recent flights last 34

DateFlightRouteTakeoffLandingDuration
2026-07-23 N668EM - Jul 23, 07:35 UTCJul 23, 07:55 UTC20m
2026-07-23 N668EM - Jul 23, 06:30 UTCJul 23, 06:40 UTC10m
2026-07-21 N668EM - Jul 21, 04:50 UTCJul 21, 05:10 UTC20m
2026-07-21 N668EM - Jul 21, 01:25 UTCJul 21, 02:05 UTC40m
2026-07-17 N668EM - Jul 17, 02:59 UTCJul 17, 03:50 UTC50m
2026-07-16 N668EM - Jul 16, 00:15 UTCJul 16, 01:45 UTC1h 30m
2026-07-06 N668EM - Jul 6, 01:25 UTCJul 6, 01:45 UTC20m
2026-07-03 N668EM - Jul 3, 04:25 UTCJul 3, 04:40 UTC15m
2026-07-03 N668EM - Jul 3, 03:15 UTCJul 3, 03:45 UTC30m
2026-07-02 N668EM - Jul 2, 01:40 UTCJul 2, 04:30 UTC2h 50m
2026-06-30 N668EM - Jun 30, 05:55 UTCJun 30, 06:15 UTC20m
2026-06-30 N668EM - Jun 30, 03:10 UTCJun 30, 04:00 UTC50m
2026-06-25 N668EM - Jun 25, 01:40 UTCJun 25, 01:54 UTC15m
2026-06-22 N668EM - Jun 22, 05:29 UTCJun 22, 05:40 UTC10m
2026-06-22 N668EM - Jun 22, 01:29 UTCJun 22, 01:40 UTC10m
2026-06-17 N668EM - Jun 17, 05:30 UTCJun 17, 05:50 UTC20m
2026-06-17 N668EM - Jun 17, 01:25 UTCJun 17, 01:45 UTC20m
2026-06-15 N668EM - Jun 15, 01:30 UTCJun 15, 02:39 UTC1h 10m
2026-06-11 N668EM - Jun 11, 02:30 UTCJun 11, 05:55 UTC3h 25m
2026-06-05 N668EM - Jun 5, 03:15 UTCJun 5, 06:25 UTC3h 10m
2026-06-03 N668EM - Jun 3, 02:45 UTCJun 3, 05:05 UTC2h 20m
2026-06-01 N668EM - Jun 1, 23:15 UTCJun 2, 00:20 UTC1h 5m
2026-05-28 N668EM - May 28, 03:20 UTCMay 28, 06:05 UTC2h 45m
2026-05-28 N668EM - May 28, 01:25 UTCMay 28, 01:35 UTC10m
2026-05-11 N668EM - May 11, 06:25 UTCMay 11, 06:35 UTC10m
2026-05-11 N668EM - May 11, 05:30 UTCMay 11, 05:45 UTC15m
2026-05-10 N668EM - May 10, 04:09 UTCMay 10, 04:55 UTC45m
2026-05-07 N668EM - May 7, 01:40 UTCMay 7, 04:35 UTC2h 55m
2026-04-26 N668EM - Apr 26, 04:30 UTCApr 26, 04:45 UTC15m
2026-04-26 N668EM - Apr 26, 03:00 UTCApr 26, 03:35 UTC35m
2026-04-24 N668EM - Apr 24, 01:30 UTCApr 24, 03:15 UTC1h 45m
2026-04-18 N668EM - Apr 18, 10:50 UTCApr 18, 11:05 UTC15m
2026-04-18 N668EM - Apr 18, 07:45 UTCApr 18, 09:20 UTC1h 35m
2026-04-18 N668EM - Apr 18, 05:55 UTCApr 18, 09:25 UTC3h 30m

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 N668EM page for operator, model, and routing details .

Mode-S A8D261 frequently asked

What is Mode-S code A8D261?
A8D261 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N668EM.
Where is Mode-S A8D261 registered?
Mode-S code A8D261 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 A8D261 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 07:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8D261, octal 52151141, decimal 11,063,905.
What flights does A8D261 operate?
Mode-S A8D261 has broadcast 1 distinct callsign, including N668EM.