Apparatus

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sensors Mode-S transponder

AB214B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N816SW · CESSNA 172 Skyhawk · operated by UNIVERSITY OF ALASKA ANCHORAGE

Hex
AB214B
Octal
52620513
Decimal
11,215,179
Country
US
Tail
N816SW
Type
C172
No current signal · last broadcast 12h ago
Flights observed
9
Distinct callsigns
1
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S AB214B.

Country allocation

The ICAO 24-bit address AB214B 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
N816SW - 9 2026-04-14

Recent flights last 9

DateFlightRouteTakeoffLandingDuration
2026-04-14 N816SW - Apr 14, 09:10 UTCApr 14, 10:45 UTC1h 35m
2026-04-14 N816SW ANC → MRI Apr 14, 07:10 UTCApr 14, 07:35 UTC25m
2026-04-14 N816SW - Apr 14, 06:20 UTCApr 14, 07:10 UTC50m
2026-04-13 N816SW - Apr 13, 23:20 UTCApr 13, 23:45 UTC25m
2026-04-13 N816SW - Apr 13, 20:50 UTCApr 13, 22:05 UTC1h 15m
2026-04-13 N816SW - Apr 13, 19:50 UTCApr 13, 19:55 UTC5m
2026-04-13 N816SW - Apr 13, 18:35 UTCApr 13, 19:55 UTC1h 20m
2026-04-13 N816SW - Apr 13, 16:15 UTCApr 13, 17:45 UTC1h 30m
2026-04-13 N816SW - Apr 13, 16:00 UTCApr 13, 16:15 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 N816SW page for operator, model, and routing details .

Mode-S AB214B frequently asked

What is Mode-S code AB214B?
AB214B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N816SW.
Where is Mode-S AB214B registered?
Mode-S code AB214B 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 AB214B broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB214B, octal 52620513, decimal 11,215,179.
What flights does AB214B operate?
Mode-S AB214B has broadcast 1 distinct callsign, including N816SW.