Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A3F8B8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N355PU · BOEING 737-800 · operated by AMERICAN AIRLINES INC

Hex
A3F8B8
Octal
50774270
Decimal
10,746,040
Country
US
Tail
N355PU
Type
B738
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
508
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S A3F8B8.

Country allocation

The ICAO 24-bit address A3F8B8 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
AAL2110 American Airlines 6 2026-06-17
AAL3173 - 4 2026-07-17
AAL3115 American Airlines 4 2026-05-18
AAL2646 - 4 2026-06-27
AAL2280 - 4 2026-07-06
AAL2244 American Airlines 4 2026-04-13
AAL2192 American Airlines 4 2026-04-17
AAL2101 American Airlines 4 2026-04-15
AAL1927 American Airlines 4 2026-04-18
AAL1244 - 4 2026-07-15
AAL1177 - 4 2026-07-01
AAL695 - 3 2026-07-07
AAL3298 American Airlines 3 2026-05-20
AAL3264 American Airlines 3 2026-06-09
AAL3149 American Airlines 3 2026-05-20
AAL3126 - 3 2026-07-03
AAL3062 American Airlines 3 2026-05-28
AAL2999 American Airlines 3 2026-07-20
AAL2941 - 3 2026-04-16
AAL2906 American Airlines 3 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2249 BOS → JFK Jul 26, 19:25 UTCJul 26, 19:50 UTC25m
2026-07-26 AAL2249 BOS → JFK Jul 26, 17:10 UTCJul 26, 17:30 UTC20m
2026-07-26 AAL2450 VRA → MIA Jul 26, 14:50 UTCJul 26, 15:30 UTC40m
2026-07-26 AAL2450 VRA → MIA Jul 26, 14:40 UTCJul 26, 15:26 UTC46m
2026-07-26 AAL1807 SFO → CLT Jul 26, 12:35 UTCJul 26, 12:50 UTC15m
2026-07-25 AAL1821 CLT → MKE Jul 25, 22:15 UTCJul 26, 03:10 UTC4h 55m
2026-07-25 AAL725R BGI → MIA Jul 25, 16:55 UTCJul 25, 20:25 UTC3h 30m
2026-07-25 AAL725R BGI → MIA Jul 25, 16:52 UTCJul 25, 20:24 UTC3h 32m
2026-07-23 AAL2393 CLT → MIA Jul 23, 23:30 UTCJul 24, 02:45 UTC3h 15m
2026-07-23 AAL2906 PVD → DCA Jul 23, 18:35 UTCJul 23, 21:00 UTC2h 25m
2026-07-23 AAL2906 PVD → DCA Jul 23, 17:50 UTCJul 23, 18:00 UTC10m
2026-07-23 AAL2906 PVD → DCA Jul 23, 13:00 UTCJul 23, 15:25 UTC2h 25m
2026-07-23 AAL3070 CHS → ORD Jul 23, 06:10 UTCJul 23, 10:20 UTC4h 10m
2026-07-23 AAL3133 UVF → PHL Jul 23, 01:10 UTCJul 23, 04:10 UTC3h 0m
2026-07-23 AAL3133 UVF → PHL Jul 23, 01:06 UTCJul 23, 04:06 UTC3h 0m
2026-07-22 AAL1574 PHL → CLT Jul 22, 20:56 UTCJul 22, 23:02 UTC2h 6m
2026-07-22 AAL1574 PHL → CLT Jul 22, 21:00 UTCJul 22, 23:05 UTC2h 5m
2026-07-22 AAL2588 CUN → AUS Jul 22, 16:45 UTCJul 22, 19:00 UTC2h 15m
2026-07-22 AAL2588 CUN → AUS Jul 22, 16:43 UTCJul 22, 18:54 UTC2h 11m
2026-07-22 AAL2179 AUS → CUN Jul 22, 13:20 UTCJul 22, 15:30 UTC2h 10m
2026-07-22 AAL1715 DTW → DFW Jul 22, 00:55 UTCJul 22, 03:00 UTC2h 5m
2026-07-21 AAL2616 PHL → STL Jul 21, 20:25 UTCJul 21, 23:00 UTC2h 35m
2026-07-21 AAL2616 PHL → STL Jul 21, 16:15 UTCJul 21, 19:05 UTC2h 50m
2026-07-21 AAL3267 EWR → ORD Jul 21, 11:52 UTCJul 21, 14:25 UTC2h 33m
2026-07-21 AAL3267 - Jul 21, 11:55 UTCJul 21, 14:05 UTC2h 10m
2026-07-20 AAL2999 PIT → PHL Jul 20, 23:55 UTCJul 21, 02:55 UTC3h 0m
2026-07-20 AAL2311 - Jul 20, 20:05 UTCJul 20, 22:20 UTC2h 15m
2026-07-20 AAL2311 PIT → DFW Jul 20, 20:05 UTCJul 20, 22:20 UTC2h 15m
2026-07-20 AAL2311 - Jul 20, 16:25 UTCJul 20, 18:45 UTC2h 20m
2026-07-20 AAL1034 GDL → DFW Jul 20, 02:25 UTCJul 20, 14:40 UTC12h 15m
2026-07-19 AAL3092 PHL → MCO Jul 19, 15:25 UTCJul 20, 00:20 UTC8h 55m
2026-07-19 AAL1553 - Jul 19, 11:20 UTCJul 19, 13:30 UTC2h 10m
2026-07-19 AAL2559 - Jul 19, 00:40 UTCJul 19, 02:50 UTC2h 10m
2026-07-18 AAL860 PHL → MBJ Jul 18, 16:40 UTCJul 18, 23:00 UTC6h 20m
2026-07-18 AAL1978 DCA → DFW Jul 18, 12:15 UTCJul 18, 14:50 UTC2h 35m
2026-07-18 AAL2648 MIA → DCA Jul 18, 01:10 UTCJul 18, 03:25 UTC2h 16m
2026-07-18 AAL2648 MIA → DCA Jul 18, 01:09 UTCJul 18, 03:20 UTC2h 11m
2026-07-17 AAL2664 - Jul 17, 20:10 UTCJul 17, 22:10 UTC2h 0m
2026-07-17 AAL2664 DCA → MIA Jul 17, 20:05 UTCJul 17, 22:11 UTC2h 6m
2026-07-17 AAL2088 MCO → DCA Jul 17, 15:00 UTCJul 17, 16:40 UTC1h 40m
2026-07-17 AAL2088 MCO → DCA Jul 17, 14:59 UTCJul 17, 16:39 UTC1h 40m
2026-07-17 AAL3173 - Jul 17, 11:35 UTCJul 17, 13:50 UTC2h 15m
2026-07-17 AAL3173 DFW → DFW Jul 17, 11:25 UTCJul 17, 11:30 UTC5m
2026-07-16 AAL2181 - Jul 16, 13:20 UTCJul 16, 14:55 UTC1h 35m
2026-07-15 AAL1244 DFW → BJX Jul 15, 21:15 UTCJul 15, 23:04 UTC1h 49m
2026-07-15 AAL1244 - Jul 15, 21:20 UTCJul 15, 22:40 UTC1h 20m
2026-07-15 AAL1441 - Jul 15, 16:30 UTCJul 15, 19:25 UTC2h 55m
2026-07-15 AAL1822 - Jul 15, 12:40 UTCJul 15, 15:10 UTC2h 30m
2026-07-14 AAL1182 - Jul 14, 21:40 UTCJul 14, 23:55 UTC2h 14m
2026-07-14 AAL1013 - Jul 14, 17:30 UTCJul 14, 20:30 UTC3h 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 N355PU page for operator, model, and routing details .

Mode-S A3F8B8 frequently asked

What is Mode-S code A3F8B8?
A3F8B8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N355PU.
Where is Mode-S A3F8B8 registered?
Mode-S code A3F8B8 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 A3F8B8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3F8B8, octal 50774270, decimal 10,746,040.
What flights does A3F8B8 operate?
Mode-S A3F8B8 has broadcast 20 distinct callsigns, including AAL2110, AAL3173, AAL3115, AAL2646, AAL2280.