Apparatus

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sensors Mode-S transponder

A81355

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N61958 · CESSNA 172R Cutlass RG · operated by SCANDINAVIAN AVIATION ACADEMY INC

Hex
A81355
Octal
52011525
Decimal
11,014,997
Country
US
Tail
N61958
Type
C72R
No current signal · last broadcast 7h ago
Flights observed
70
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A81355.

Country allocation

The ICAO 24-bit address A81355 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
N61958 - 70 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 N61958 HMT → RBK Jul 5, 17:40 UTCJul 5, 17:50 UTC10m
2026-07-05 N61958 RBK → HMT Jul 5, 15:55 UTCJul 5, 16:10 UTC15m
2026-07-02 N61958 - Jul 2, 18:55 UTCJul 2, 19:35 UTC40m
2026-07-01 N61958 - Jul 1, 23:55 UTCJul 2, 01:00 UTC1h 5m
2026-07-01 N61958 - Jul 1, 00:00 UTCJul 1, 01:10 UTC1h 10m
2026-06-29 N61958 SEE → SEE Jun 29, 19:54 UTCJun 29, 20:59 UTC1h 5m
2026-06-28 N61958 - Jun 28, 21:59 UTCJun 28, 22:55 UTC55m
2026-06-28 N61958 - Jun 28, 19:09 UTCJun 28, 19:59 UTC50m
2026-06-27 N61958 SEE → SEE Jun 27, 19:34 UTCJun 27, 21:25 UTC1h 50m
2026-06-27 N61958 - Jun 27, 02:59 UTCJun 27, 03:40 UTC40m
2026-06-27 N61958 SEE → HMT Jun 27, 02:04 UTCJun 27, 02:39 UTC35m
2026-06-26 N61958 - Jun 26, 03:00 UTCJun 26, 03:34 UTC35m
2026-06-26 N61958 - Jun 26, 00:50 UTCJun 26, 02:05 UTC1h 15m
2026-06-25 N61958 - Jun 25, 21:50 UTCJun 25, 23:14 UTC1h 25m
2026-06-25 N61958 - Jun 25, 16:45 UTCJun 25, 17:54 UTC1h 10m
2026-06-25 N61958 - Jun 25, 01:14 UTCJun 25, 02:30 UTC1h 15m
2026-06-24 N61958 SEE → SEE Jun 24, 23:20 UTCJun 25, 00:29 UTC1h 10m
2026-06-24 N61958 - Jun 24, 21:34 UTCJun 24, 22:14 UTC40m
2026-06-24 N61958 - Jun 24, 17:50 UTCJun 24, 18:55 UTC1h 5m
2026-06-24 N61958 - Jun 24, 02:40 UTCJun 24, 03:24 UTC45m
2026-06-24 N61958 HMT → HMT Jun 24, 02:24 UTCJun 24, 02:34 UTC10m
2026-06-24 N61958 - Jun 24, 01:44 UTCJun 24, 02:20 UTC35m
2026-06-23 N61958 - Jun 23, 18:04 UTCJun 23, 19:10 UTC1h 5m
2026-06-22 N61958 - Jun 22, 22:44 UTCJun 23, 02:20 UTC3h 35m
2026-06-21 N61958 - Jun 21, 20:45 UTCJun 21, 23:00 UTC2h 15m
2026-06-21 N61958 BFL → SBP Jun 21, 18:35 UTCJun 21, 19:24 UTC50m
2026-06-21 N61958 SEE → BFL Jun 21, 16:30 UTCJun 21, 18:20 UTC1h 50m
2026-06-20 N61958 SEE → SEE Jun 20, 19:24 UTCJun 20, 20:45 UTC1h 20m
2026-06-20 N61958 SEE → SEE Jun 20, 02:09 UTCJun 20, 03:04 UTC55m
2026-06-19 N61958 - Jun 19, 20:44 UTCJun 19, 23:00 UTC2h 15m
2026-06-19 N61958 - Jun 19, 18:30 UTCJun 19, 19:19 UTC50m
2026-06-19 N61958 - Jun 19, 16:25 UTCJun 19, 18:14 UTC1h 50m
2026-06-18 N61958 - Jun 18, 23:35 UTCJun 19, 00:45 UTC1h 9m
2026-06-18 N61958 - Jun 18, 20:40 UTCJun 18, 22:30 UTC1h 50m
2026-06-18 N61958 - Jun 18, 18:40 UTCJun 18, 19:35 UTC55m
2026-06-18 N61958 - Jun 18, 17:35 UTCJun 18, 18:10 UTC35m
2026-06-17 N61958 HMT → SEE Jun 17, 23:00 UTCJun 18, 01:05 UTC2h 5m
2026-06-17 N61958 - Jun 17, 22:15 UTCJun 17, 22:55 UTC40m
2026-06-17 N61958 SEE → SEE Jun 17, 20:45 UTCJun 17, 21:20 UTC35m
2026-06-17 N61958 SEE → SEE Jun 17, 18:05 UTCJun 17, 19:20 UTC1h 15m
2026-06-17 N61958 - Jun 17, 16:35 UTCJun 17, 17:15 UTC40m
2026-06-17 N61958 - Jun 17, 01:50 UTCJun 17, 02:55 UTC1h 5m
2026-06-16 N61958 SEE → SEE Jun 16, 22:25 UTCJun 16, 23:20 UTC55m
2026-06-16 N61958 - Jun 16, 20:45 UTCJun 16, 21:10 UTC25m
2026-06-16 N61958 - Jun 16, 19:05 UTCJun 16, 19:35 UTC30m
2026-06-15 N61958 - Jun 15, 00:55 UTCJun 15, 02:15 UTC1h 20m
2026-06-14 N61958 - Jun 14, 22:05 UTCJun 14, 23:10 UTC1h 5m
2026-06-14 N61958 - Jun 14, 16:50 UTCJun 14, 18:00 UTC1h 10m
2026-06-14 N61958 - Jun 14, 01:10 UTCJun 14, 02:10 UTC1h 0m
2026-06-13 N61958 - Jun 13, 22:05 UTCJun 13, 22:35 UTC30m

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 N61958 page for operator, model, and routing details .

Mode-S A81355 frequently asked

What is Mode-S code A81355?
A81355 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N61958.
Where is Mode-S A81355 registered?
Mode-S code A81355 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 A81355 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81355, octal 52011525, decimal 11,014,997.
What flights does A81355 operate?
Mode-S A81355 has broadcast 1 distinct callsign, including N61958.