Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A08021

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N131NN · AIRBUS A-321 · operated by BANK OF UTAH TRUSTEE

Hex
A08021
Octal
50100041
Decimal
10,518,561
Country
US
Tail
N131NN
Type
A321
Broadcasting now · callsign AAL669 · 33,975 ft
Flights observed
508
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A08021 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A08021 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
AAL870 American Airlines 8 2026-06-26
AAL2458 - 7 2026-07-12
AAL2379 American Airlines 6 2026-06-21
AAL830 American Airlines 5 2026-05-06
AAL415 American Airlines 5 2026-05-21
AAL3114 - 5 2026-07-03
AAL2486 American Airlines 5 2026-04-15
AAL2252 American Airlines 5 2026-06-08
AAL903 American Airlines 4 2026-06-17
AAL437 - 4 2026-06-17
AAL2924 American Airlines 4 2026-04-26
AAL2845 American Airlines 4 2026-04-26
AAL2748 - 4 2026-04-13
AAL2681 American Airlines 4 2026-04-16
AAL2584 - 4 2026-06-15
AAL2090 American Airlines 4 2026-05-15
AAL1852 American Airlines 4 2026-05-05
AAL1580 American Airlines 4 2026-04-17
AAL1476 American Airlines 4 2026-05-18
AAL1043 American Airlines 4 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL669 - Jul 14, 04:10 UTCJul 14, 06:15 UTC2h 5m
2026-07-13 AAL2690 - Jul 13, 23:10 UTCJul 14, 02:00 UTC2h 50m
2026-07-13 AAL1628 - Jul 13, 17:35 UTCJul 13, 21:15 UTC3h 40m
2026-07-12 AAL1972 DFW → LAX Jul 12, 22:50 UTCJul 13, 01:35 UTC2h 45m
2026-07-12 AAL1828 - Jul 12, 18:15 UTCJul 12, 21:15 UTC3h 0m
2026-07-12 AAL1828 - Jul 12, 14:25 UTCJul 12, 17:01 UTC2h 35m
2026-07-12 AAL2458 - Jul 12, 02:10 UTCJul 12, 04:45 UTC2h 35m
2026-07-11 AAL2458 DFW → SAN Jul 11, 22:35 UTCJul 12, 01:05 UTC2h 30m
2026-07-11 AAL1304 SJD → DFW Jul 11, 17:56 UTCJul 11, 20:15 UTC2h 19m
2026-07-11 AAL1304 DFW → DFW Jul 11, 14:35 UTCJul 11, 20:15 UTC5h 40m
2026-07-11 AAL2272 - Jul 11, 12:35 UTCJul 11, 13:10 UTC35m
2026-07-11 AAL2272 OKC → DFW Jul 11, 12:35 UTCJul 11, 13:10 UTC35m
2026-07-11 AAL2734 DFW → OKC Jul 11, 10:15 UTCJul 11, 10:50 UTC35m
2026-07-11 AAL1322 - Jul 11, 05:45 UTCJul 11, 07:15 UTC1h 30m
2026-07-11 AAL1322 DEN → DFW Jul 11, 05:44 UTCJul 11, 07:17 UTC1h 33m
2026-07-11 AAL2235 DFW → DEN Jul 11, 01:15 UTCJul 11, 03:25 UTC2h 10m
2026-07-10 AAL928 ABQ → DFW Jul 10, 16:55 UTCJul 10, 18:15 UTC1h 20m
2026-07-10 AAL928 DFW → ABQ Jul 10, 14:30 UTCJul 10, 15:45 UTC1h 15m
2026-07-10 AAL1251 MSP → DFW Jul 10, 10:15 UTCJul 10, 12:15 UTC2h 0m
2026-07-10 AAL2978 DFW → MSP Jul 10, 01:20 UTCJul 10, 03:15 UTC1h 55m
2026-07-09 AAL1615 BUF → DFW Jul 9, 21:10 UTCJul 9, 23:50 UTC2h 40m
2026-07-09 AAL1615 DFW → BUF Jul 9, 17:10 UTCJul 9, 19:40 UTC2h 30m
2026-07-09 AAL1908 - Jul 9, 13:05 UTCJul 9, 14:15 UTC1h 10m
2026-07-09 AAL1908 LAS → DFW Jul 9, 13:05 UTCJul 9, 15:20 UTC2h 15m
2026-07-09 AAL3250 CLT → ORD Jul 9, 03:00 UTCJul 9, 07:35 UTC4h 35m
2026-07-09 AAL3250 CLT → ORD Jul 9, 02:45 UTCJul 9, 02:50 UTC5m
2026-07-09 AAL3250 CLT → ORD Jul 9, 02:10 UTCJul 9, 02:20 UTC10m
2026-07-08 AAL1349 MIA → PHL Jul 8, 22:35 UTCJul 9, 00:55 UTC2h 20m
2026-07-08 AAL2665 - Jul 8, 19:20 UTCJul 8, 20:35 UTC1h 15m
2026-07-08 AAL2422 OPF → CUN Jul 8, 16:25 UTCJul 8, 17:45 UTC1h 20m
2026-07-08 AAL422 DCA → MIA Jul 8, 12:40 UTCJul 8, 14:45 UTC2h 5m
2026-07-08 AAL422 DCA → MIA Jul 8, 12:38 UTCJul 8, 14:45 UTC2h 7m
2026-07-07 AAL667 - Jul 7, 23:10 UTCJul 8, 01:10 UTC2h 0m
2026-07-07 AAL2367 EWR → DFW Jul 7, 19:25 UTCJul 7, 21:10 UTC1h 45m
2026-07-07 AAL2367 EWR → DFW Jul 7, 15:50 UTCJul 7, 16:15 UTC25m
2026-07-07 AAL2367 EWR → DFW Jul 7, 15:49 UTCJul 7, 17:44 UTC1h 55m
2026-07-07 AAL3055 DFW → MIA Jul 7, 11:10 UTCJul 7, 13:30 UTC2h 20m
2026-07-07 AAL2458 - Jul 7, 02:10 UTCJul 7, 04:35 UTC2h 25m
2026-07-06 AAL2458 - Jul 6, 22:15 UTCJul 7, 00:55 UTC2h 40m
2026-07-06 AAL1583 CMH → DFW Jul 6, 17:15 UTCJul 6, 20:45 UTC3h 30m
2026-07-06 AAL1583 CMH → DFW Jul 6, 12:30 UTCJul 6, 15:50 UTC3h 20m
2026-07-06 AAL3314 - Jul 6, 07:00 UTCJul 6, 09:45 UTC2h 45m
2026-07-06 AAL3314 DFW → SMF Jul 6, 02:35 UTCJul 6, 05:45 UTC3h 10m
2026-07-05 AAL2387 - Jul 5, 21:50 UTCJul 6, 01:00 UTC3h 10m
2026-07-05 AAL2387 DFW → SFO Jul 5, 17:15 UTCJul 5, 20:25 UTC3h 10m
2026-07-05 AAL2172 - Jul 5, 12:45 UTCJul 5, 15:05 UTC2h 20m
2026-07-04 AAL2127 - Jul 4, 15:50 UTCJul 4, 16:55 UTC1h 5m
2026-07-04 AAL3217 - Jul 4, 12:15 UTCJul 4, 13:05 UTC50m
2026-07-04 AAL226G - Jul 4, 10:15 UTCJul 4, 11:05 UTC50m
2026-07-04 AAL226G CLT → CMH Jul 4, 10:11 UTCJul 4, 11:05 UTC54m

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 N131NN page for operator, model, and routing details .

Mode-S A08021 frequently asked

What is Mode-S code A08021?
A08021 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N131NN.
Where is Mode-S A08021 registered?
Mode-S code A08021 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 A08021 broadcasting right now?
Yes. Mode-S A08021 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A08021, octal 50100041, decimal 10,518,561.
What flights does A08021 operate?
Mode-S A08021 has broadcast 20 distinct callsigns, including AAL870, AAL2458, AAL2379, AAL830, AAL415.