Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC31A1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N885NN · BOEING 737-800 · operated by BANK OF UTAH TRUSTEE

Hex
AC31A1
Octal
53030641
Decimal
11,284,897
Country
US
Tail
N885NN
Type
B738
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
564
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S AC31A1.

Country allocation

The ICAO 24-bit address AC31A1 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
AAL2740 - 6 2026-07-06
AAL1352 - 6 2026-06-27
AAL526 - 5 2026-07-20
AAL400 - 5 2026-06-26
AAL2581 American Airlines 5 2026-06-04
AAL440 American Airlines 4 2026-06-11
AAL301 American Airlines 4 2026-04-14
AAL2318 American Airlines 4 2026-06-12
AAL2247 American Airlines 4 2026-05-28
AAL2231 American Airlines 4 2026-06-16
AAL2183 American Airlines 4 2026-05-30
AAL1944 American Airlines 4 2026-06-11
AAL1823 American Airlines 4 2026-04-29
AAL1793 American Airlines 4 2026-05-29
AAL1680 American Airlines 4 2026-07-20
AAL1656 American Airlines 4 2026-07-22
AAL1408 - 4 2026-06-27
AAL1395 - 4 2026-06-19
AAL1161 - 4 2026-04-13
AAL1119 - 4 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2877 NAS → ORD Jul 26, 18:55 UTCJul 26, 22:00 UTC3h 5m
2026-07-26 AAL2908 TPA → PHL Jul 26, 15:15 UTCJul 26, 16:54 UTC1h 39m
2026-07-26 AAL1042 DFW → MIA Jul 26, 11:40 UTCJul 26, 13:45 UTC2h 5m
2026-07-26 AAL2628 DFW → OMA Jul 26, 02:45 UTCJul 26, 04:10 UTC1h 25m
2026-07-26 AAL2628 DFW → OMA Jul 26, 02:42 UTCJul 26, 04:07 UTC1h 25m
2026-07-25 AAL2446 ORD → PBI Jul 25, 22:35 UTCJul 26, 00:55 UTC2h 20m
2026-07-25 AAL2446 ORD → PBI Jul 25, 18:55 UTCJul 25, 21:15 UTC2h 20m
2026-07-25 AAL2152 DCA → BOS Jul 25, 15:38 UTCJul 25, 17:24 UTC1h 46m
2026-07-25 AAL2152 DCA → BOS Jul 25, 15:40 UTCJul 25, 17:25 UTC1h 45m
2026-07-25 AAL2152 DCA → BOS Jul 25, 12:25 UTCJul 25, 14:25 UTC2h 0m
2026-07-24 AAL2416 CLT → CVG Jul 24, 23:35 UTCJul 25, 02:05 UTC2h 30m
2026-07-24 AAL2416 CLT → CVG Jul 24, 19:55 UTCJul 24, 22:20 UTC2h 25m
2026-07-24 AAL1279 MSY → PHX Jul 24, 15:55 UTCJul 24, 18:00 UTC2h 5m
2026-07-24 AAL1279 MSY → PHX Jul 24, 12:30 UTCJul 24, 14:25 UTC1h 55m
2026-07-24 AAL2342 SAT → DFW Jul 24, 10:15 UTCJul 24, 11:05 UTC50m
2026-07-24 AAL1599 ORD → BOS Jul 24, 04:20 UTCJul 24, 05:05 UTC45m
2026-07-23 AAL1626 LGA → DFW Jul 23, 23:30 UTCJul 24, 02:10 UTC2h 40m
2026-07-23 AAL1634 AUS → PHL Jul 23, 19:50 UTCJul 23, 22:15 UTC2h 25m
2026-07-23 AAL1634 AUS → PHL Jul 23, 19:46 UTCJul 23, 22:14 UTC2h 28m
2026-07-23 AAL1301 JFK → MIA Jul 23, 14:40 UTCJul 23, 18:15 UTC3h 35m
2026-07-23 AAL655 JFK → MIA Jul 23, 10:20 UTCJul 23, 12:45 UTC2h 25m
2026-07-23 AAL655 JFK → MIA Jul 23, 10:18 UTCJul 23, 12:43 UTC2h 25m
2026-07-22 AAL1203 BOS → DFW Jul 22, 23:50 UTCJul 23, 02:50 UTC3h 0m
2026-07-22 AAL1203 BOS → DFW Jul 22, 23:48 UTCJul 23, 02:47 UTC2h 59m
2026-07-22 AAL1656 MIA → LGA Jul 22, 20:10 UTCJul 22, 22:20 UTC2h 10m
2026-07-22 AAL1656 MIA → LGA Jul 22, 16:25 UTCJul 22, 18:30 UTC2h 5m
2026-07-22 AAL1978 DCA → DFW Jul 22, 12:15 UTCJul 22, 15:00 UTC2h 45m
2026-07-20 AAL3101 DFW → DTW Jul 20, 20:10 UTCJul 20, 22:45 UTC2h 35m
2026-07-20 AAL3101 DFW → DTW Jul 20, 20:07 UTCJul 20, 22:43 UTC2h 36m
2026-07-20 AAL1680 DFW → CAE Jul 20, 16:20 UTCJul 20, 18:35 UTC2h 15m
2026-07-20 AAL1680 DFW → CAE Jul 20, 16:20 UTCJul 20, 18:36 UTC2h 16m
2026-07-20 AAL1680 DFW → CAE Jul 20, 12:45 UTCJul 20, 15:05 UTC2h 20m
2026-07-20 AAL1680 DFW → CAE Jul 20, 12:25 UTCJul 20, 12:30 UTC5m
2026-07-20 AAL2821 BNA → DFW Jul 20, 10:10 UTCJul 20, 11:30 UTC1h 20m
2026-07-20 AAL526 - Jul 20, 05:25 UTCJul 20, 06:15 UTC50m
2026-07-20 AAL2731 - Jul 20, 02:40 UTCJul 20, 04:00 UTC1h 20m
2026-07-20 AAL2731 - Jul 20, 00:15 UTCJul 20, 01:40 UTC1h 25m
2026-07-19 AAL1548 PHX → BOS Jul 19, 17:45 UTCJul 19, 19:30 UTC1h 45m
2026-07-19 AAL74Q PHL → BOS Jul 19, 13:20 UTCJul 19, 16:10 UTC2h 50m
2026-07-19 AAL74Q PHL → BOS Jul 19, 13:16 UTCJul 19, 16:04 UTC2h 48m
2026-07-19 AAL1452 - Jul 19, 02:25 UTCJul 19, 04:30 UTC2h 5m
2026-07-19 AAL1452 BNA → MIA Jul 19, 02:22 UTCJul 19, 04:23 UTC2h 1m
2026-07-18 AAL1490 DFW → BNA Jul 18, 23:45 UTCJul 19, 01:10 UTC1h 25m
2026-07-18 AAL1337 - Jul 18, 15:20 UTCJul 18, 21:20 UTC6h 0m
2026-07-18 AAL3055 DFW → MIA Jul 18, 11:10 UTCJul 18, 13:55 UTC2h 45m
2026-07-18 AAL1682 DCA → ORD Jul 18, 01:00 UTCJul 18, 03:25 UTC2h 26m
2026-07-17 AAL1682 DCA → ORD Jul 17, 21:10 UTCJul 17, 23:30 UTC2h 20m
2026-07-17 AAL1014 - Jul 17, 17:25 UTCJul 17, 19:20 UTC1h 55m
2026-07-17 AAL1014 TUS → DFW Jul 17, 17:22 UTCJul 17, 19:10 UTC1h 48m
2026-07-17 AAL1014 DFW → TUS Jul 17, 13:45 UTCJul 17, 15:35 UTC1h 50m

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 N885NN page for operator, model, and routing details .

Mode-S AC31A1 frequently asked

What is Mode-S code AC31A1?
AC31A1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N885NN.
Where is Mode-S AC31A1 registered?
Mode-S code AC31A1 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 AC31A1 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 AC31A1, octal 53030641, decimal 11,284,897.
What flights does AC31A1 operate?
Mode-S AC31A1 has broadcast 20 distinct callsigns, including AAL2740, AAL1352, AAL526, AAL400, AAL2581.