Apparatus

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sensors Mode-S transponder

A858F6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N637NN · operated by AMERICAN AIRLINES INC

Hex
A858F6
Octal
52054366
Decimal
11,032,822
Country
US
Tail
N637NN
Type
CRJ9
No current signal · last broadcast 2h ago
Flights observed
629
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A858F6.

Country allocation

The ICAO 24-bit address A858F6 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
JIA5179 - 10 2026-07-02
JIA5639 PSA Airlines 8 2026-05-24
JIA5063 - 8 2026-06-18
JIA5627 - 7 2026-07-08
JIA5540 - 7 2026-07-05
JIA5442 - 7 2026-06-22
JIA5132 PSA Airlines 7 2026-05-06
JIA5083 - 7 2026-06-25
JIA5657 PSA Airlines 6 2026-05-05
JIA5399 - 6 2026-07-13
JIA5353 - 6 2026-06-22
JIA5299 - 6 2026-06-26
JIA5275 - 6 2026-07-06
JIA5274 PSA Airlines 6 2026-05-17
JIA5136 PSA Airlines 6 2026-05-09
JIA5134 - 6 2026-06-27
JIA5118 - 6 2026-07-11
JIA5039 - 6 2026-07-12
JIA5024 - 6 2026-07-10
JIA5624 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JIA5053 - Jul 14, 00:55 UTCJul 14, 02:05 UTC1h 10m
2026-07-13 JIA5604 - Jul 13, 22:25 UTCJul 13, 23:35 UTC1h 10m
2026-07-13 JIA5604 PNS → CLT Jul 13, 22:23 UTCJul 13, 23:34 UTC1h 11m
2026-07-13 JIA5604 - Jul 13, 20:10 UTCJul 13, 21:30 UTC1h 20m
2026-07-13 JIA5446 - Jul 13, 16:10 UTCJul 13, 17:55 UTC1h 45m
2026-07-13 JIA5446 - Jul 13, 13:20 UTCJul 13, 14:55 UTC1h 35m
2026-07-13 JIA5399 - Jul 13, 10:25 UTCJul 13, 11:45 UTC1h 20m
2026-07-13 JIA5399 SBN → CLT Jul 13, 10:20 UTCJul 13, 11:41 UTC1h 21m
2026-07-13 JIA5053 - Jul 13, 02:25 UTCJul 13, 03:45 UTC1h 20m
2026-07-12 JIA5628 - Jul 12, 21:05 UTCJul 12, 22:45 UTC1h 40m
2026-07-12 JIA5628 - Jul 12, 18:05 UTCJul 12, 19:30 UTC1h 25m
2026-07-12 JIA5039 - Jul 12, 15:40 UTCJul 12, 16:20 UTC40m
2026-07-12 JIA5039 - Jul 12, 13:40 UTCJul 12, 14:20 UTC40m
2026-07-12 JIA5548 - Jul 12, 10:35 UTCJul 12, 11:45 UTC1h 10m
2026-07-11 JIA5429 - Jul 11, 22:40 UTCJul 11, 23:50 UTC1h 10m
2026-07-11 JIA5118 - Jul 11, 20:00 UTCJul 11, 20:55 UTC55m
2026-07-11 JIA5118 - Jul 11, 17:50 UTCJul 11, 18:30 UTC40m
2026-07-11 JIA5039 - Jul 11, 15:30 UTCJul 11, 16:15 UTC45m
2026-07-11 JIA5039 - Jul 11, 13:50 UTCJul 11, 14:30 UTC40m
2026-07-10 JIA5024 - Jul 10, 21:50 UTCJul 10, 23:00 UTC1h 10m
2026-07-10 JIA5595 - Jul 10, 16:55 UTCJul 10, 18:35 UTC1h 40m
2026-07-10 JIA5595 - Jul 10, 13:25 UTCJul 10, 15:00 UTC1h 35m
2026-07-10 JIA5214 - Jul 10, 10:10 UTCJul 10, 11:20 UTC1h 10m
2026-07-10 JIA5214 DAB → CLT Jul 10, 10:09 UTCJul 10, 11:19 UTC1h 10m
2026-07-10 JIA5613 - Jul 10, 03:00 UTCJul 10, 04:00 UTC1h 0m
2026-07-10 JIA5613 CLT → DAB Jul 10, 02:59 UTCJul 10, 04:01 UTC1h 2m
2026-07-09 JIA5030 - Jul 9, 23:40 UTCJul 10, 01:05 UTC1h 25m
2026-07-09 JIA5030 - Jul 9, 20:55 UTCJul 9, 22:25 UTC1h 30m
2026-07-09 JIA5571 - Jul 9, 17:40 UTCJul 9, 19:15 UTC1h 35m
2026-07-09 JIA5480 - Jul 9, 15:10 UTCJul 9, 16:30 UTC1h 20m
2026-07-09 JIA5480 PHL → TVC Jul 9, 15:07 UTCJul 9, 16:39 UTC1h 32m
2026-07-09 JIA5578 - Jul 9, 13:30 UTCJul 9, 13:45 UTC15m
2026-07-09 JIA5578 - Jul 9, 12:05 UTCJul 9, 13:45 UTC1h 40m
2026-07-09 JIA5578 CVG → PHL Jul 9, 12:04 UTCJul 9, 13:15 UTC1h 11m
2026-07-08 JIA9954 - Jul 8, 21:25 UTCJul 8, 22:20 UTC55m
2026-07-08 JIA5118 - Jul 8, 19:35 UTCJul 8, 20:15 UTC40m
2026-07-08 JIA5118 - Jul 8, 18:10 UTCJul 8, 18:40 UTC30m
2026-07-08 JIA5039 - Jul 8, 15:35 UTCJul 8, 16:20 UTC45m
2026-07-08 JIA5039 - Jul 8, 13:50 UTCJul 8, 14:35 UTC45m
2026-07-08 JIA5627 - Jul 8, 04:00 UTCJul 8, 05:15 UTC1h 15m
2026-07-07 JIA5627 - Jul 7, 23:20 UTCJul 8, 00:40 UTC1h 20m
2026-07-07 JIA5462 - Jul 7, 15:45 UTCJul 7, 16:50 UTC1h 5m
2026-07-07 JIA5462 - Jul 7, 13:55 UTCJul 7, 14:50 UTC55m
2026-07-06 JIA5275 - Jul 6, 22:20 UTCJul 6, 23:20 UTC1h 0m
2026-07-06 JIA5275 MDT → CLT Jul 6, 22:17 UTCJul 6, 23:25 UTC1h 8m
2026-07-06 JIA5275 - Jul 6, 20:25 UTCJul 6, 21:25 UTC1h 0m
2026-07-06 JIA5020 - Jul 6, 16:05 UTCJul 6, 17:40 UTC1h 35m
2026-07-06 JIA5020 - Jul 6, 13:20 UTCJul 6, 14:45 UTC1h 25m
2026-07-06 JIA5020 CLT → YYZ Jul 6, 13:17 UTCJul 6, 14:40 UTC1h 23m
2026-07-06 JIA5654 - Jul 6, 11:25 UTCJul 6, 11:50 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 N637NN page for operator, model, and routing details .

Mode-S A858F6 frequently asked

What is Mode-S code A858F6?
A858F6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N637NN.
Where is Mode-S A858F6 registered?
Mode-S code A858F6 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 A858F6 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A858F6, octal 52054366, decimal 11,032,822.
What flights does A858F6 operate?
Mode-S A858F6 has broadcast 20 distinct callsigns, including JIA5179, JIA5639, JIA5063, JIA5627, JIA5540.