Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1222D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N172SB · CESSNA 172 Skyhawk · operated by BIRMINGHAM FLIGHT CENTER LLC

Hex
A1222D
Octal
50221055
Decimal
10,560,045
Country
US
Tail
N172SB
Type
C172
No current signal · last broadcast 12d ago
Flights observed
91
Distinct callsigns
1
Country
US
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S A1222D.

Country allocation

The ICAO 24-bit address A1222D 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
N172SB - 91 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N172SB - Jul 25, 14:50 UTCJul 25, 16:15 UTC1h 25m
2026-07-23 N172SB - Jul 23, 15:45 UTCJul 23, 17:10 UTC1h 25m
2026-07-23 N172SB - Jul 23, 11:30 UTCJul 23, 12:55 UTC1h 25m
2026-07-22 N172SB - Jul 22, 17:55 UTCJul 22, 18:55 UTC1h 0m
2026-07-22 N172SB - Jul 22, 16:20 UTCJul 22, 17:05 UTC45m
2026-07-22 N172SB - Jul 22, 13:40 UTCJul 22, 15:10 UTC1h 30m
2026-07-22 N172SB - Jul 22, 11:35 UTCJul 22, 12:45 UTC1h 10m
2026-07-21 N172SB - Jul 21, 23:15 UTCJul 22, 00:20 UTC1h 5m
2026-07-21 N172SB - Jul 21, 21:35 UTCJul 21, 22:20 UTC45m
2026-07-21 N172SB - Jul 21, 20:00 UTCJul 21, 21:00 UTC1h 0m
2026-07-21 N172SB - Jul 21, 19:05 UTCJul 21, 19:25 UTC20m
2026-07-21 N172SB - Jul 21, 14:50 UTCJul 21, 15:25 UTC35m
2026-07-21 N172SB - Jul 21, 13:45 UTCJul 21, 14:15 UTC30m
2026-07-21 N172SB - Jul 21, 11:40 UTCJul 21, 12:35 UTC55m
2026-07-20 N172SB - Jul 20, 20:10 UTCJul 20, 21:10 UTC1h 0m
2026-07-20 N172SB - Jul 20, 16:45 UTCJul 20, 16:55 UTC10m
2026-07-20 N172SB - Jul 20, 12:30 UTCJul 20, 12:40 UTC10m
2026-07-19 N172SB - Jul 19, 15:10 UTCJul 19, 15:50 UTC40m
2026-07-19 N172SB - Jul 19, 13:05 UTCJul 19, 13:40 UTC35m
2026-07-18 N172SB - Jul 18, 19:15 UTCJul 18, 20:15 UTC1h 0m
2026-07-11 N172SB - Jul 11, 21:25 UTCJul 11, 22:35 UTC1h 10m
2026-07-11 N172SB - Jul 11, 15:40 UTCJul 11, 15:55 UTC15m
2026-07-11 N172SB - Jul 11, 14:55 UTCJul 11, 15:05 UTC10m
2026-07-10 N172SB - Jul 10, 20:15 UTCJul 10, 21:30 UTC1h 15m
2026-07-10 N172SB - Jul 10, 16:00 UTCJul 10, 16:20 UTC20m
2026-07-10 N172SB - Jul 10, 14:50 UTCJul 10, 15:05 UTC15m
2026-07-10 N172SB - Jul 10, 13:40 UTCJul 10, 14:05 UTC25m
2026-07-10 N172SB - Jul 10, 13:00 UTCJul 10, 13:35 UTC35m
2026-07-09 N172SB - Jul 9, 23:25 UTCJul 9, 23:35 UTC10m
2026-07-09 N172SB - Jul 9, 18:45 UTCJul 9, 19:25 UTC40m
2026-07-09 N172SB - Jul 9, 16:35 UTCJul 9, 16:50 UTC15m
2026-07-09 N172SB - Jul 9, 00:35 UTCJul 9, 00:45 UTC10m
2026-07-08 N172SB - Jul 8, 19:00 UTCJul 8, 19:50 UTC50m
2026-07-08 N172SB - Jul 8, 16:10 UTCJul 8, 17:35 UTC1h 25m
2026-07-08 N172SB - Jul 8, 15:05 UTCJul 8, 15:20 UTC15m
2026-07-08 N172SB - Jul 8, 13:45 UTCJul 8, 14:30 UTC45m
2026-07-08 N172SB - Jul 8, 12:30 UTCJul 8, 12:50 UTC20m
2026-07-08 N172SB - Jul 8, 11:40 UTCJul 8, 11:50 UTC10m
2026-07-07 N172SB - Jul 7, 16:25 UTCJul 7, 17:35 UTC1h 10m
2026-07-07 N172SB - Jul 7, 12:40 UTCJul 7, 13:50 UTC1h 10m
2026-07-03 N172SB - Jul 3, 16:05 UTCJul 3, 16:45 UTC40m
2026-06-26 N172SB - Jun 26, 23:30 UTCJun 27, 00:00 UTC30m
2026-06-26 N172SB - Jun 26, 21:04 UTCJun 26, 21:20 UTC15m
2026-06-26 N172SB - Jun 26, 19:14 UTCJun 26, 19:24 UTC10m
2026-06-24 N172SB - Jun 24, 15:59 UTCJun 24, 16:29 UTC30m
2026-06-24 N172SB - Jun 24, 11:05 UTCJun 24, 12:54 UTC1h 50m
2026-06-23 N172SB - Jun 23, 23:24 UTCJun 24, 01:19 UTC1h 55m
2026-06-23 N172SB - Jun 23, 14:49 UTCJun 23, 14:59 UTC10m
2026-06-23 N172SB - Jun 23, 14:10 UTCJun 23, 14:19 UTC10m
2026-06-23 N172SB - Jun 23, 11:45 UTCJun 23, 11:59 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 N172SB page for operator, model, and routing details .

Mode-S A1222D frequently asked

What is Mode-S code A1222D?
A1222D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N172SB.
Where is Mode-S A1222D registered?
Mode-S code A1222D 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 A1222D broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1222D, octal 50221055, decimal 10,560,045.
What flights does A1222D operate?
Mode-S A1222D has broadcast 1 distinct callsign, including N172SB.