Apparatus

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sensors Mode-S transponder

A77AD8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N581NN · BOMBARDIER Regional Jet CRJ-900 · operated by AMERICAN AIRLINES INC

Hex
A77AD8
Octal
51675330
Decimal
10,975,960
Country
US
Tail
N581NN
Type
CRJ9
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
644
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A77AD8.

Country allocation

The ICAO 24-bit address A77AD8 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
JIA5580 PSA Airlines 8 2026-06-19
JIA5590 - 7 2026-06-14
JIA5383 PSA Airlines 7 2026-07-20
JIA5104 - 7 2026-06-22
JIA5658 - 6 2026-06-18
JIA5644 PSA Airlines 6 2026-07-17
JIA5620 - 6 2026-07-13
JIA5541 - 6 2026-07-16
JIA5530 PSA Airlines 6 2026-06-09
JIA5394 PSA Airlines 6 2026-05-31
JIA5349 - 6 2026-06-27
JIA5221 - 6 2026-07-05
JIA5150 PSA Airlines 6 2026-07-24
JIA5585 - 5 2026-06-28
JIA5485 - 5 2026-06-21
JIA5444 PSA Airlines 5 2026-07-23
JIA5443 PSA Airlines 5 2026-06-09
JIA5420 - 5 2026-06-30
JIA5415 - 5 2026-07-14
JIA5318 - 5 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JIA5040 PHL → CVG Jul 26, 21:40 UTCJul 26, 22:00 UTC20m
2026-07-26 JIA5490 ALB → DCA Jul 26, 18:30 UTCJul 26, 19:30 UTC1h 0m
2026-07-26 JIA5490 ALB → DCA Jul 26, 16:20 UTCJul 26, 17:25 UTC1h 5m
2026-07-26 JIA5182 DCA → BGR Jul 26, 14:15 UTCJul 26, 14:55 UTC40m
2026-07-26 JIA5511 DCA → PVD Jul 26, 03:05 UTCJul 26, 03:40 UTC35m
2026-07-25 JIA5360 PHL → GSP Jul 25, 21:10 UTCJul 25, 23:00 UTC1h 50m
2026-07-25 JIA5360 PHL → GSP Jul 25, 18:05 UTCJul 25, 20:10 UTC2h 5m
2026-07-25 JIA5555 CVG → CLT Jul 25, 14:05 UTCJul 25, 14:35 UTC30m
2026-07-25 JIA5555 CVG → CLT Jul 25, 12:40 UTCJul 25, 13:00 UTC20m
2026-07-25 JIA5507 DCA → MEM Jul 25, 09:15 UTCJul 25, 10:00 UTC45m
2026-07-25 JIA5507 DCA → MEM Jul 25, 09:14 UTCJul 25, 09:57 UTC43m
2026-07-25 JIA5528 MCI → DCA Jul 25, 01:00 UTCJul 25, 01:40 UTC40m
2026-07-24 JIA5117 YYZ → PHL Jul 24, 21:45 UTCJul 24, 22:45 UTC1h 0m
2026-07-24 JIA5117 YYZ → PHL Jul 24, 21:40 UTCJul 24, 22:40 UTC1h 0m
2026-07-24 JIA5117 YYZ → PHL Jul 24, 20:05 UTCJul 24, 21:00 UTC55m
2026-07-24 JIA5405 PHL → MSY Jul 24, 17:05 UTCJul 24, 18:35 UTC1h 30m
2026-07-24 JIA5405 PHL → MSY Jul 24, 17:01 UTCJul 24, 18:34 UTC1h 33m
2026-07-24 JIA5405 PHL → MSY Jul 24, 14:40 UTCJul 24, 16:15 UTC1h 35m
2026-07-24 JIA5150 PVD → PHL Jul 24, 01:00 UTCJul 24, 02:05 UTC1h 5m
2026-07-23 JIA5150 PVD → PHL Jul 23, 23:10 UTCJul 24, 00:15 UTC1h 5m
2026-07-23 JIA5444 PHL → SDF Jul 23, 19:00 UTCJul 23, 20:45 UTC1h 45m
2026-07-23 JIA5444 PHL → SDF Jul 23, 16:30 UTCJul 23, 18:15 UTC1h 45m
2026-07-23 JIA5444 PHL → SDF Jul 23, 13:15 UTCJul 23, 14:55 UTC1h 40m
2026-07-22 JIA5444 - Jul 22, 16:05 UTCJul 22, 17:45 UTC1h 40m
2026-07-22 JIA5444 CLT → XNA Jul 22, 16:00 UTCJul 22, 17:40 UTC1h 40m
2026-07-22 JIA5679 DCA → PHL Jul 22, 11:40 UTCJul 22, 13:30 UTC1h 50m
2026-07-22 JIA5679 DCA → PHL Jul 22, 11:40 UTCJul 22, 13:35 UTC1h 55m
2026-07-22 JIA5137 - Jul 22, 02:00 UTCJul 22, 04:10 UTC2h 10m
2026-07-22 JIA5137 CLT → YUL Jul 22, 01:58 UTCJul 22, 04:11 UTC2h 13m
2026-07-21 JIA5275 MYR → PHL Jul 21, 23:20 UTCJul 22, 00:45 UTC1h 25m
2026-07-21 JIA5275 MYR → PHL Jul 21, 20:20 UTCJul 21, 21:25 UTC1h 5m
2026-07-21 JIA5294 - Jul 21, 16:55 UTCJul 21, 19:05 UTC2h 10m
2026-07-21 JIA5294 - Jul 21, 14:15 UTCJul 21, 15:55 UTC1h 40m
2026-07-21 JIA5540 - Jul 21, 10:35 UTCJul 21, 11:45 UTC1h 10m
2026-07-21 JIA5540 AVP → CLT Jul 21, 10:29 UTCJul 21, 11:37 UTC1h 8m
2026-07-21 JIA5464 - Jul 21, 04:00 UTCJul 21, 05:10 UTC1h 10m
2026-07-21 JIA5464 CLT → AVP Jul 21, 03:55 UTCJul 21, 05:11 UTC1h 16m
2026-07-21 JIA5439 LEX → PHL Jul 21, 00:00 UTCJul 21, 01:15 UTC1h 15m
2026-07-20 JIA5439 LEX → PHL Jul 20, 21:35 UTCJul 20, 22:40 UTC1h 5m
2026-07-20 JIA5383 HSV → DFW Jul 20, 19:30 UTCJul 20, 20:15 UTC45m
2026-07-20 JIA5383 HSV → DFW Jul 20, 17:25 UTCJul 20, 18:05 UTC40m
2026-07-20 JIA5143 PIA → DFW Jul 20, 15:15 UTCJul 20, 15:55 UTC40m
2026-07-20 JIA5143 PIA → DFW Jul 20, 13:25 UTCJul 20, 14:10 UTC45m
2026-07-20 JIA5399 SBN → CLT Jul 20, 10:15 UTCJul 20, 11:20 UTC1h 5m
2026-07-20 JIA5399 SBN → CLT Jul 20, 10:10 UTCJul 20, 11:23 UTC1h 13m
2026-07-20 JIA5053 - Jul 20, 01:00 UTCJul 20, 02:20 UTC1h 20m
2026-07-20 JIA5053 CLT → SBN Jul 20, 00:58 UTCJul 20, 02:19 UTC1h 21m
2026-07-19 JIA5672 LIT → CLT Jul 19, 22:50 UTCJul 19, 23:25 UTC35m
2026-07-19 JIA5672 LIT → CLT Jul 19, 21:15 UTCJul 19, 21:45 UTC30m
2026-07-19 JIA5571 BUF → PHL Jul 19, 17:30 UTCJul 19, 19:00 UTC1h 30m

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 N581NN page for operator, model, and routing details .

Mode-S A77AD8 frequently asked

What is Mode-S code A77AD8?
A77AD8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N581NN.
Where is Mode-S A77AD8 registered?
Mode-S code A77AD8 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 A77AD8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A77AD8, octal 51675330, decimal 10,975,960.
What flights does A77AD8 operate?
Mode-S A77AD8 has broadcast 20 distinct callsigns, including JIA5580, JIA5590, JIA5383, JIA5104, JIA5658.