Apparatus

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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 1d ago
Flights observed
103
Distinct callsigns
2
Country
US
Last broadcast
1d ago

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 - 99 2026-06-14
SFE1 - 4 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-14 SFE2 - Jun 14, 01:15 UTCJun 14, 02:35 UTC1h 20m
2026-06-13 SFE2 - Jun 13, 19:00 UTCJun 13, 19:15 UTC15m
2026-06-13 SFE2 - Jun 13, 17:55 UTCJun 13, 18:25 UTC30m
2026-06-13 SFE2 - Jun 13, 15:55 UTCJun 13, 17:10 UTC1h 15m
2026-06-13 SFE2 - Jun 13, 14:45 UTCJun 13, 15:20 UTC35m
2026-06-12 SFE2 - Jun 12, 03:10 UTCJun 12, 03:25 UTC15m
2026-06-12 SFE2 - Jun 12, 02:20 UTCJun 12, 02:30 UTC10m
2026-06-12 SFE2 - Jun 12, 01:35 UTCJun 12, 02:10 UTC35m
2026-06-11 SFE2 - Jun 11, 23:10 UTCJun 11, 23:25 UTC15m
2026-06-11 SFE2 - Jun 11, 22:00 UTCJun 11, 22:30 UTC30m
2026-06-11 SFE2 - Jun 11, 14:50 UTCJun 11, 15:00 UTC10m
2026-06-10 SFE2 - Jun 10, 17:55 UTCJun 10, 18:05 UTC10m
2026-06-10 SFE2 - Jun 10, 17:05 UTCJun 10, 17:15 UTC10m
2026-06-08 SFE2 - Jun 8, 18:35 UTCJun 8, 19:05 UTC30m
2026-06-06 SFE2 - Jun 6, 20:45 UTCJun 6, 21:00 UTC15m
2026-06-06 SFE2 - Jun 6, 20:10 UTCJun 6, 20:39 UTC30m
2026-06-06 SFE2 - Jun 6, 18:50 UTCJun 6, 19:24 UTC35m
2026-06-06 SFE2 - Jun 6, 17:54 UTCJun 6, 18:09 UTC15m
2026-06-06 SFE2 - Jun 6, 16:24 UTCJun 6, 16:39 UTC15m
2026-06-03 SFE2 - Jun 3, 17:05 UTCJun 3, 18:40 UTC1h 35m
2026-06-02 SFE2 - Jun 2, 22:00 UTCJun 2, 22:15 UTC15m
2026-06-02 SFE2 - Jun 2, 20:55 UTCJun 2, 21:05 UTC10m
2026-06-02 SFE2 - Jun 2, 19:30 UTCJun 2, 20:05 UTC35m
2026-06-02 SFE2 - Jun 2, 16:45 UTCJun 2, 17:25 UTC40m
2026-05-29 SFE2 - May 29, 17:15 UTCMay 29, 17:30 UTC15m
2026-05-29 SFE2 - May 29, 15:05 UTCMay 29, 15:20 UTC15m
2026-05-28 SFE2 - May 28, 03:15 UTCMay 28, 03:30 UTC15m
2026-05-28 SFE2 - May 28, 02:55 UTCMay 28, 03:00 UTC5m
2026-05-28 SFE2 - May 28, 02:35 UTCMay 28, 02:45 UTC10m
2026-05-28 SFE2 - May 28, 00:05 UTCMay 28, 00:15 UTC10m
2026-05-27 SFE2 - May 27, 23:35 UTCMay 27, 23:55 UTC20m
2026-05-24 SFE2 - May 24, 17:05 UTCMay 24, 17:15 UTC10m
2026-05-23 SFE2 - May 23, 19:35 UTCMay 23, 20:35 UTC1h 0m
2026-05-23 SFE2 - May 23, 17:30 UTCMay 23, 18:20 UTC50m
2026-05-23 SFE2 - May 23, 17:10 UTCMay 23, 17:20 UTC10m
2026-05-23 SFE2 - May 23, 16:10 UTCMay 23, 16:40 UTC30m
2026-05-22 SFE2 - May 22, 18:05 UTCMay 22, 18:50 UTC45m
2026-05-22 SFE2 - May 22, 17:20 UTCMay 22, 17:50 UTC30m
2026-05-21 SFE2 - May 21, 18:20 UTCMay 21, 18:40 UTC20m
2026-05-20 SFE2 - May 20, 22:30 UTCMay 20, 22:55 UTC25m
2026-05-20 SFE2 - May 20, 20:55 UTCMay 20, 21:05 UTC10m
2026-05-20 SFE2 - May 20, 17:30 UTCMay 20, 19:00 UTC1h 30m
2026-05-20 SFE2 - May 20, 16:00 UTCMay 20, 16:55 UTC55m
2026-05-19 SFE2 - May 19, 22:50 UTCMay 19, 23:25 UTC35m
2026-05-18 SFE2 - May 18, 18:25 UTCMay 18, 18:45 UTC19m
2026-05-18 SFE2 - May 18, 16:55 UTCMay 18, 17:50 UTC55m
2026-05-17 SFE2 - May 17, 23:20 UTCMay 17, 23:35 UTC15m
2026-05-17 SFE2 - May 17, 22:30 UTCMay 17, 22:35 UTC5m
2026-05-17 SFE2 - May 17, 21:40 UTCMay 17, 21:55 UTC15m
2026-05-17 SFE2 - May 17, 16:50 UTCMay 17, 17:50 UTC1h 0m

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 1d ago.
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.