Apparatus

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sensors Mode-S transponder

A61BB1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N493ER · CESSNA 172 Skyhawk · operated by EMBRY-RIDDLE AERONAUTICAL UNIVERSITY

Hex
A61BB1
Octal
51415661
Decimal
10,886,065
Country
US
Tail
N493ER
Type
C172
No current signal · last broadcast 22d ago
Flights observed
194
Distinct callsigns
1
Country
US
Last broadcast
22d ago

Last known position

Most recent position reported by Mode-S A61BB1.

Country allocation

The ICAO 24-bit address A61BB1 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
ERU493 - 194 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 ERU493 - Jul 24, 14:00 UTCJul 24, 14:25 UTC25m
2026-07-24 ERU493 - Jul 24, 12:45 UTCJul 24, 13:15 UTC30m
2026-07-23 ERU493 - Jul 23, 15:20 UTCJul 23, 16:25 UTC1h 5m
2026-07-23 ERU493 - Jul 23, 13:00 UTCJul 23, 13:40 UTC40m
2026-07-23 ERU493 - Jul 23, 10:40 UTCJul 23, 11:50 UTC1h 10m
2026-07-22 ERU493 - Jul 22, 17:30 UTCJul 22, 18:45 UTC1h 15m
2026-07-22 ERU493 - Jul 22, 13:45 UTCJul 22, 14:20 UTC35m
2026-07-22 ERU493 - Jul 22, 12:35 UTCJul 22, 13:10 UTC35m
2026-07-21 ERU493 - Jul 21, 17:25 UTCJul 21, 17:35 UTC10m
2026-07-21 ERU493 - Jul 21, 15:50 UTCJul 21, 16:35 UTC45m
2026-07-21 ERU493 - Jul 21, 10:30 UTCJul 21, 12:00 UTC1h 30m
2026-07-20 ERU493 - Jul 20, 11:10 UTCJul 20, 13:00 UTC1h 50m
2026-07-17 ERU493 - Jul 17, 15:29 UTCJul 17, 17:05 UTC1h 35m
2026-07-17 ERU493 - Jul 17, 10:25 UTCJul 17, 13:35 UTC3h 10m
2026-07-16 ERU493 - Jul 16, 12:20 UTCJul 16, 13:45 UTC1h 25m
2026-07-15 ERU493 - Jul 15, 15:05 UTCJul 15, 16:25 UTC1h 20m
2026-07-15 ERU493 - Jul 15, 10:20 UTCJul 15, 12:10 UTC1h 50m
2026-07-14 ERU493 - Jul 14, 22:50 UTCJul 14, 23:50 UTC1h 0m
2026-07-14 ERU493 - Jul 14, 15:45 UTCJul 14, 16:55 UTC1h 10m
2026-07-14 ERU493 - Jul 14, 11:05 UTCJul 14, 12:25 UTC1h 20m
2026-07-13 ERU493 - Jul 13, 14:15 UTCJul 13, 15:30 UTC1h 15m
2026-07-13 ERU493 - Jul 13, 11:00 UTCJul 13, 12:20 UTC1h 20m
2026-07-12 ERU493 - Jul 12, 23:25 UTCJul 13, 00:30 UTC1h 5m
2026-07-12 ERU493 - Jul 12, 14:45 UTCJul 12, 15:10 UTC25m
2026-07-12 ERU493 - Jul 12, 13:10 UTCJul 12, 14:10 UTC1h 0m
2026-07-11 ERU493 - Jul 11, 17:10 UTCJul 11, 17:55 UTC45m
2026-07-11 ERU493 - Jul 11, 16:00 UTCJul 11, 16:30 UTC30m
2026-07-11 ERU493 - Jul 11, 12:50 UTCJul 11, 14:25 UTC1h 35m
2026-07-11 ERU493 - Jul 11, 01:15 UTCJul 11, 02:30 UTC1h 15m
2026-07-10 ERU493 - Jul 10, 17:45 UTCJul 10, 19:20 UTC1h 35m
2026-07-10 ERU493 - Jul 10, 12:55 UTCJul 10, 14:50 UTC1h 55m
2026-07-09 ERU493 - Jul 9, 22:30 UTCJul 9, 23:40 UTC1h 10m
2026-07-09 ERU493 - Jul 9, 15:35 UTCJul 9, 17:30 UTC1h 55m
2026-07-09 ERU493 - Jul 9, 10:55 UTCJul 9, 12:00 UTC1h 5m
2026-07-08 ERU493 - Jul 8, 15:20 UTCJul 8, 16:30 UTC1h 10m
2026-07-08 ERU493 - Jul 8, 10:30 UTCJul 8, 11:55 UTC1h 25m
2026-07-07 ERU493 - Jul 7, 15:30 UTCJul 7, 16:30 UTC1h 0m
2026-07-07 ERU493 - Jul 7, 12:35 UTCJul 7, 13:05 UTC30m
2026-07-07 ERU493 - Jul 7, 10:00 UTCJul 7, 10:20 UTC20m
2026-07-02 ERU493 - Jul 2, 12:25 UTCJul 2, 12:50 UTC25m
2026-07-01 ERU493 - Jul 1, 10:45 UTCJul 1, 12:10 UTC1h 25m
2026-06-29 ERU493 - Jun 29, 16:00 UTCJun 29, 16:55 UTC55m
2026-06-29 ERU493 - Jun 29, 12:39 UTCJun 29, 13:59 UTC1h 20m
2026-06-29 ERU493 - Jun 29, 10:40 UTCJun 29, 12:00 UTC1h 20m
2026-06-28 ERU493 - Jun 28, 15:20 UTCJun 28, 16:29 UTC1h 10m
2026-06-28 ERU493 - Jun 28, 10:39 UTCJun 28, 12:09 UTC1h 30m
2026-06-27 ERU493 - Jun 27, 14:05 UTCJun 27, 14:39 UTC35m
2026-06-27 ERU493 - Jun 27, 12:39 UTCJun 27, 13:15 UTC35m
2026-06-26 ERU493 - Jun 26, 19:35 UTCJun 26, 19:55 UTC20m
2026-06-26 ERU493 - Jun 26, 17:54 UTCJun 26, 18:24 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 N493ER page for operator, model, and routing details .

Mode-S A61BB1 frequently asked

What is Mode-S code A61BB1?
A61BB1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N493ER.
Where is Mode-S A61BB1 registered?
Mode-S code A61BB1 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 A61BB1 broadcasting right now?
No active broadcast right now. Last signal was 22d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61BB1, octal 51415661, decimal 10,886,065.
What flights does A61BB1 operate?
Mode-S A61BB1 has broadcast 1 distinct callsign, including ERU493.