Apparatus

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sensors Mode-S transponder

A61E91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4937G · CESSNA 172 Skyhawk · operated by INTERNATIONAL AIR SERVICES INC TRUSTEE

Hex
A61E91
Octal
51417221
Decimal
10,886,801
Country
US
Tail
N4937G
Type
C172
No current signal · last broadcast 21h ago
Flights observed
39
Distinct callsigns
1
Country
US
Last broadcast
21h ago

Last known position

Most recent position reported by Mode-S A61E91.

Country allocation

The ICAO 24-bit address A61E91 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
N4937G - 39 2026-07-20

Recent flights last 39

DateFlightRouteTakeoffLandingDuration
2026-07-20 N4937G VNY → VNY Jul 20, 15:55 UTCJul 20, 17:45 UTC1h 50m
2026-07-11 N4937G - Jul 11, 20:45 UTCJul 11, 21:40 UTC55m
2026-07-09 N4937G VNY → VNY Jul 9, 17:00 UTCJul 9, 17:35 UTC35m
2026-07-06 N4937G VNY → VNY Jul 6, 16:45 UTCJul 6, 19:15 UTC2h 30m
2026-07-05 N4937G - Jul 5, 18:10 UTCJul 5, 18:30 UTC20m
2026-07-05 N4937G - Jul 5, 16:35 UTCJul 5, 16:55 UTC20m
2026-07-02 N4937G VNY → VNY Jul 2, 20:05 UTCJul 2, 21:15 UTC1h 10m
2026-07-01 N4937G VNY → VNY Jul 1, 18:10 UTCJul 1, 20:10 UTC2h 0m
2026-06-30 N4937G VNY → VNY Jun 30, 18:40 UTCJun 30, 21:40 UTC3h 0m
2026-06-29 N4937G - Jun 29, 20:30 UTCJun 29, 21:50 UTC1h 20m
2026-06-29 N4937G - Jun 29, 17:59 UTCJun 29, 19:39 UTC1h 40m
2026-06-27 N4937G VNY → VNY Jun 27, 20:04 UTCJun 27, 22:35 UTC2h 30m
2026-06-27 N4937G VNY → VNY Jun 27, 18:04 UTCJun 27, 19:15 UTC1h 10m
2026-06-25 N4937G - Jun 25, 19:15 UTCJun 25, 20:19 UTC1h 5m
2026-06-25 N4937G VNY → EMT Jun 25, 17:09 UTCJun 25, 18:19 UTC1h 10m
2026-06-24 N4937G - Jun 24, 21:40 UTCJun 24, 22:00 UTC20m
2026-06-24 N4937G VNY → EMT Jun 24, 18:29 UTCJun 24, 20:35 UTC2h 5m
2026-06-22 N4937G - Jun 22, 21:40 UTCJun 22, 22:05 UTC25m
2026-06-22 N4937G VNY → EMT Jun 22, 18:44 UTCJun 22, 20:39 UTC1h 55m
2026-06-21 N4937G VNY → VNY Jun 21, 18:20 UTCJun 21, 21:54 UTC3h 35m
2026-06-19 N4937G VNY → VNY Jun 19, 21:49 UTCJun 19, 22:34 UTC45m
2026-06-17 N4937G - Jun 17, 19:40 UTCJun 17, 20:50 UTC1h 10m
2026-06-17 N4937G VNY → POC Jun 17, 16:45 UTCJun 17, 18:25 UTC1h 40m
2026-06-16 N4937G - Jun 16, 19:50 UTCJun 16, 20:30 UTC40m
2026-06-16 N4937G - Jun 16, 17:55 UTCJun 16, 18:55 UTC1h 0m
2026-06-12 N4937G VNY → VNY Jun 12, 15:40 UTCJun 12, 15:50 UTC10m
2026-05-18 N4937G - May 18, 02:40 UTCMay 18, 02:55 UTC15m
2026-05-18 N4937G - May 18, 00:00 UTCMay 18, 01:25 UTC1h 25m
2026-05-16 N4937G - May 16, 21:45 UTCMay 16, 22:15 UTC30m
2026-05-16 N4937G VNY → CNO May 16, 18:30 UTCMay 16, 19:00 UTC30m
2026-05-03 N4937G - May 3, 22:05 UTCMay 3, 22:34 UTC30m
2026-05-03 N4937G - May 3, 20:30 UTCMay 3, 20:49 UTC20m
2026-05-03 N4937G - May 3, 00:20 UTCMay 3, 00:50 UTC30m
2026-05-02 N4937G - May 2, 22:45 UTCMay 2, 23:10 UTC25m
2026-05-02 N4937G - May 2, 21:05 UTCMay 2, 21:25 UTC20m
2026-05-01 N4937G - May 1, 20:10 UTCMay 1, 20:40 UTC30m
2026-04-17 N4937G VNY → VNY Apr 17, 20:05 UTCApr 17, 20:45 UTC40m
2026-04-16 N4937G VNY → VNY Apr 16, 22:00 UTCApr 16, 22:45 UTC45m
2026-04-13 N4937G VNY → VNY Apr 13, 20:55 UTCApr 13, 21:10 UTC15m

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 N4937G page for operator, model, and routing details .

Mode-S A61E91 frequently asked

What is Mode-S code A61E91?
A61E91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4937G.
Where is Mode-S A61E91 registered?
Mode-S code A61E91 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 A61E91 broadcasting right now?
No active broadcast right now. Last signal was 21h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61E91, octal 51417221, decimal 10,886,801.
What flights does A61E91 operate?
Mode-S A61E91 has broadcast 1 distinct callsign, including N4937G.