Apparatus

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sensors Mode-S transponder

AD8857

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N971LA · CESSNA 408 SkyCourier · operated by TVPX AIRCRAFT SOLUTIONS INC TRUSTEE

Hex
AD8857
Octal
53304127
Decimal
11,372,631
Country
US
Tail
N971LA
Type
C408
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
349
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S AD8857.

Country allocation

The ICAO 24-bit address AD8857 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 20 distinct

Callsign Airline Flights Last seen
STT813 Air St. Thomas 46 2026-07-26
STT422 Air St. Thomas 45 2026-07-26
STT823 Air St. Thomas 40 2026-07-26
STT412 Air St. Thomas 40 2026-07-26
STT817 Air St. Thomas 36 2026-07-25
STT416 Air St. Thomas 36 2026-07-25
STT831 Air St. Thomas 9 2026-07-26
STT426 - 9 2026-07-14
STT933 Air St. Thomas 8 2026-07-23
STT932 Air St. Thomas 8 2026-07-24
STT934 Air St. Thomas 7 2026-07-24
STT827 Air St. Thomas 7 2026-07-26
STT821 - 6 2026-07-14
STT811 - 6 2026-07-13
STT414 - 6 2026-07-13
STT815 - 5 2026-07-13
STT807 - 5 2026-07-13
STT430 - 5 2026-07-16
STT420 - 5 2026-07-14
STT410 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 STT813 LNY → HNL Jul 26, 20:55 UTCJul 26, 21:15 UTC20m
2026-07-26 STT412 HNL → LNY Jul 26, 20:00 UTCJul 26, 20:20 UTC20m
2026-07-26 STT831 LNY → HNL Jul 26, 04:50 UTCJul 26, 06:00 UTC1h 10m
2026-07-26 STT827 LNY → HNL Jul 26, 03:00 UTCJul 26, 04:15 UTC1h 15m
2026-07-26 STT823 LNY → HNL Jul 26, 02:05 UTCJul 26, 02:25 UTC20m
2026-07-26 STT422 HNL → LNY Jul 26, 01:05 UTCJul 26, 01:25 UTC20m
2026-07-25 STT817 LNY → HNL Jul 25, 22:55 UTCJul 25, 23:15 UTC20m
2026-07-25 STT416 HNL → LNY Jul 25, 22:00 UTCJul 25, 22:20 UTC20m
2026-07-25 STT813 LNY → HNL Jul 25, 21:05 UTCJul 25, 21:25 UTC20m
2026-07-25 STT412 HNL → LNY Jul 25, 20:05 UTCJul 25, 20:30 UTC25m
2026-07-25 STT935 MKK → HNL Jul 25, 03:20 UTCJul 25, 04:15 UTC55m
2026-07-25 STT422 HNL → LNY Jul 25, 01:30 UTCJul 25, 02:35 UTC1h 5m
2026-07-24 STT416 HNL → LNY Jul 24, 22:15 UTCJul 24, 23:25 UTC1h 10m
2026-07-24 STT813 LNY → HNL Jul 24, 20:50 UTCJul 24, 21:15 UTC25m
2026-07-24 STT412 HNL → LNY Jul 24, 19:55 UTCJul 24, 20:15 UTC20m
2026-07-24 STT932 HNL → MKK Jul 24, 17:35 UTCJul 24, 18:35 UTC1h 0m
2026-07-24 STT934 HNL → LNY Jul 24, 04:00 UTCJul 24, 05:00 UTC1h 0m
2026-07-24 STT823 LNY → HNL Jul 24, 02:10 UTCJul 24, 02:30 UTC20m
2026-07-24 STT422 HNL → LNY Jul 24, 01:05 UTCJul 24, 01:30 UTC25m
2026-07-23 STT416 HNL → LNY Jul 23, 22:20 UTCJul 23, 23:25 UTC1h 5m
2026-07-23 STT813 LNY → HNL Jul 23, 20:15 UTCJul 23, 21:20 UTC1h 5m
2026-07-23 STT933 MKK → HNL Jul 23, 18:25 UTCJul 23, 18:45 UTC20m
2026-07-23 STT932 HNL → MKK Jul 23, 17:35 UTCJul 23, 17:50 UTC15m
2026-07-23 STT934 - Jul 23, 03:15 UTCJul 23, 04:10 UTC55m
2026-07-23 STT823 LNY → HNL Jul 23, 02:05 UTCJul 23, 02:30 UTC25m
2026-07-23 STT422 - Jul 23, 01:05 UTCJul 23, 01:25 UTC20m
2026-07-22 STT817 - Jul 22, 22:10 UTCJul 22, 23:20 UTC1h 10m
2026-07-22 STT412 HNL → LNY Jul 22, 20:10 UTCJul 22, 21:20 UTC1h 10m
2026-07-22 STT933 MKK → HNL Jul 22, 19:10 UTCJul 22, 19:25 UTC15m
2026-07-22 STT932 HNL → MKK Jul 22, 18:05 UTCJul 22, 18:25 UTC20m
2026-07-22 STT934 - Jul 22, 03:25 UTCJul 22, 04:25 UTC1h 0m
2026-07-22 STT422 - Jul 22, 01:25 UTCJul 22, 02:40 UTC1h 15m
2026-07-21 STT817 - Jul 21, 22:35 UTCJul 21, 23:50 UTC1h 15m
2026-07-21 STT813 - Jul 21, 20:05 UTCJul 21, 21:20 UTC1h 15m
2026-07-21 STT933 MKK → HNL Jul 21, 18:35 UTCJul 21, 18:50 UTC15m
2026-07-21 STT932 - Jul 21, 17:45 UTCJul 21, 18:05 UTC20m
2026-07-21 STT934 - Jul 21, 03:35 UTCJul 21, 04:45 UTC1h 10m
2026-07-21 STT422 - Jul 21, 01:45 UTCJul 21, 03:00 UTC1h 15m
2026-07-20 STT817 - Jul 20, 22:10 UTCJul 20, 23:15 UTC1h 5m
2026-07-20 STT813 - Jul 20, 21:05 UTCJul 20, 21:25 UTC20m
2026-07-20 STT412 - Jul 20, 20:15 UTCJul 20, 20:35 UTC20m
2026-07-20 STT823 - Jul 20, 01:05 UTCJul 20, 02:15 UTC1h 10m
2026-07-19 STT817 - Jul 19, 22:15 UTCJul 19, 23:25 UTC1h 10m
2026-07-19 STT813 - Jul 19, 21:00 UTCJul 19, 21:20 UTC20m
2026-07-19 STT412 - Jul 19, 20:05 UTCJul 19, 20:25 UTC20m
2026-07-19 STT422 - Jul 19, 00:55 UTCJul 19, 01:55 UTC1h 0m
2026-07-18 STT416 - Jul 18, 22:15 UTCJul 18, 23:20 UTC1h 5m
2026-07-18 STT412 - Jul 18, 20:10 UTCJul 18, 21:15 UTC1h 5m
2026-07-18 STT827 - Jul 18, 03:15 UTCJul 18, 04:20 UTC1h 5m
2026-07-18 STT823 - Jul 18, 02:14 UTCJul 18, 02:35 UTC20m

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 N971LA page for operator, model, and routing details .

Mode-S AD8857 frequently asked

What is Mode-S code AD8857?
AD8857 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N971LA.
Where is Mode-S AD8857 registered?
Mode-S code AD8857 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 AD8857 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD8857, octal 53304127, decimal 11,372,631.
What flights does AD8857 operate?
Mode-S AD8857 has broadcast 20 distinct callsigns, including STT813, STT422, STT823, STT412, STT817.