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sensors Mode-S transponder

A33AFF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N307TC · AGUSTA AW-169 · operated by COUNTY OF TRAVIS

Hex
A33AFF
Octal
50635377
Decimal
10,697,471
Country
US
Tail
N307TC
Type
A169
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
201
Distinct callsigns
2
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A33AFF.

Country allocation

The ICAO 24-bit address A33AFF 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 2 distinct

Callsign Airline Flights Last seen
SFE2 - 190 2026-07-26
SFE1 - 4 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SFE2 - Jul 26, 21:10 UTCJul 26, 21:30 UTC20m
2026-07-26 SFE2 - Jul 26, 20:40 UTCJul 26, 21:00 UTC20m
2026-07-26 - - Jul 26, 20:20 UTCJul 26, 20:30 UTC10m
2026-07-26 - - Jul 26, 19:00 UTCJul 26, 19:50 UTC50m
2026-07-26 - - Jul 26, 01:45 UTCJul 26, 02:00 UTC15m
2026-07-26 SFE2 - Jul 26, 00:50 UTCJul 26, 01:20 UTC30m
2026-07-25 SFE2 - Jul 25, 17:25 UTCJul 25, 18:00 UTC35m
2026-07-24 SFE2 - Jul 24, 22:20 UTCJul 24, 22:35 UTC15m
2026-07-24 SFE2 - Jul 24, 20:55 UTCJul 24, 21:50 UTC55m
2026-07-24 SFE2 - Jul 24, 19:20 UTCJul 24, 19:35 UTC15m
2026-07-24 SFE2 - Jul 24, 17:50 UTCJul 24, 18:50 UTC1h 0m
2026-07-24 SFE2 - Jul 24, 17:30 UTCJul 24, 17:45 UTC15m
2026-07-22 SFE2 - Jul 22, 22:00 UTCJul 22, 23:25 UTC1h 25m
2026-07-22 SFE2 - Jul 22, 02:00 UTCJul 22, 02:15 UTC15m
2026-07-22 SFE2 - Jul 22, 01:35 UTCJul 22, 01:50 UTC15m
2026-07-22 SFE2 - Jul 22, 00:20 UTCJul 22, 00:50 UTC30m
2026-07-21 - - Jul 21, 23:00 UTCJul 21, 23:35 UTC35m
2026-07-21 - - Jul 21, 22:35 UTCJul 21, 22:50 UTC15m
2026-07-21 SFE2 - Jul 21, 21:00 UTCJul 21, 21:20 UTC20m
2026-07-21 SFE2 - Jul 21, 19:55 UTCJul 21, 20:30 UTC35m
2026-07-21 - - Jul 21, 15:10 UTCJul 21, 16:10 UTC1h 0m
2026-07-20 - - Jul 20, 22:00 UTCJul 20, 22:20 UTC20m
2026-07-20 SFE2 - Jul 20, 19:15 UTCJul 20, 19:35 UTC20m
2026-07-20 SFE2 - Jul 20, 14:35 UTCJul 20, 14:40 UTC5m
2026-07-20 SFE2 - Jul 20, 14:15 UTCJul 20, 14:30 UTC15m
2026-07-19 SFE2 - Jul 19, 16:45 UTCJul 19, 16:55 UTC10m
2026-07-19 SFE2 - Jul 19, 15:25 UTCJul 19, 15:55 UTC30m
2026-07-17 SFE2 - Jul 17, 21:39 UTCJul 17, 21:55 UTC15m
2026-07-17 SFE2 - Jul 17, 20:50 UTCJul 17, 20:55 UTC5m
2026-07-17 SFE2 - Jul 17, 19:20 UTCJul 17, 20:04 UTC45m
2026-07-17 SFE2 - Jul 17, 17:25 UTCJul 17, 17:40 UTC15m
2026-07-17 SFE2 - Jul 17, 16:10 UTCJul 17, 16:19 UTC10m
2026-07-17 SFE2 - Jul 17, 06:40 UTCJul 17, 07:30 UTC50m
2026-07-16 SFE2 - Jul 16, 01:00 UTCJul 16, 01:10 UTC10m
2026-07-13 SFE2 - Jul 13, 22:00 UTCJul 13, 22:10 UTC10m
2026-07-13 SFE2 - Jul 13, 14:00 UTCJul 13, 14:10 UTC10m
2026-07-10 SFE2 - Jul 10, 00:35 UTCJul 10, 00:45 UTC10m
2026-07-09 SFE2 - Jul 9, 23:40 UTCJul 10, 00:00 UTC20m
2026-07-09 SFE2 - Jul 9, 17:45 UTCJul 9, 17:55 UTC10m
2026-07-09 SFE2 - Jul 9, 16:25 UTCJul 9, 17:05 UTC40m
2026-07-09 SFE2 - Jul 9, 15:15 UTCJul 9, 15:45 UTC30m
2026-07-09 SFE2 - Jul 9, 14:55 UTCJul 9, 15:10 UTC15m
2026-07-09 SFE2 - Jul 9, 00:40 UTCJul 9, 01:05 UTC25m
2026-07-08 SFE2 - Jul 8, 23:05 UTCJul 8, 23:50 UTC45m
2026-07-08 SFE2 - Jul 8, 00:50 UTCJul 8, 01:00 UTC10m
2026-07-07 SFE2 - Jul 7, 21:10 UTCJul 7, 21:55 UTC45m
2026-07-07 SFE2 - Jul 7, 20:00 UTCJul 7, 20:15 UTC15m
2026-07-07 SFE2 - Jul 7, 03:20 UTCJul 7, 03:35 UTC15m
2026-07-07 SFE2 - Jul 7, 02:25 UTCJul 7, 02:50 UTC25m
2026-07-07 SFE2 - Jul 7, 01:05 UTCJul 7, 01:30 UTC25m

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 N307TC page for operator, model, and routing details .

Mode-S A33AFF frequently asked

What is Mode-S code A33AFF?
A33AFF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N307TC.
Where is Mode-S A33AFF registered?
Mode-S code A33AFF 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 A33AFF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A33AFF, octal 50635377, decimal 10,697,471.
What flights does A33AFF operate?
Mode-S A33AFF has broadcast 2 distinct callsigns, including SFE2, SFE1.