Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC02B4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N873NN · BOEING 737-800 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
AC02B4
Octal
53001264
Decimal
11,272,884
Country
US
Tail
N873NN
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
446
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AC02B4.

Country allocation

The ICAO 24-bit address AC02B4 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
AAL1014 - 6 2026-07-10
AAL1936 - 5 2026-07-16
AAL1177 - 5 2026-06-17
AAL357 - 4 2026-07-12
AAL3267 - 4 2026-06-16
AAL2933 American Airlines 4 2026-05-06
AAL2581 - 4 2026-07-22
AAL2520 American Airlines 4 2026-06-28
AAL2435 - 4 2026-06-26
AAL2327 - 4 2026-06-26
AAL2307 American Airlines 4 2026-07-24
AAL2302 American Airlines 4 2026-07-24
AAL1476 American Airlines 4 2026-06-09
AAL999 American Airlines 3 2026-06-14
AAL618 American Airlines 3 2026-06-04
AAL3034 American Airlines 3 2026-07-21
AAL2941 American Airlines 3 2026-04-26
AAL2873 American Airlines 3 2026-06-03
AAL2817 - 3 2026-07-02
AAL277 American Airlines 3 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3208 TPA → LGA Jul 26, 21:30 UTCJul 26, 23:00 UTC1h 30m
2026-07-26 AAL1388 PHX → JFK Jul 26, 17:18 UTCJul 26, 18:44 UTC1h 26m
2026-07-26 AAL1388 PHX → JFK Jul 26, 14:20 UTCJul 26, 18:50 UTC4h 30m
2026-07-26 AAL2436 EWR → DFW Jul 26, 12:00 UTCJul 26, 12:25 UTC25m
2026-07-26 AAL2245 DFW → BDL Jul 26, 00:20 UTCJul 26, 00:45 UTC25m
2026-07-25 AAL1124 BAQ → MIA Jul 25, 21:30 UTCJul 25, 22:00 UTC30m
2026-07-25 AAL1124 BAQ → MIA Jul 25, 19:40 UTCJul 25, 19:50 UTC10m
2026-07-25 AAL1124 BAQ → MIA Jul 25, 19:35 UTCJul 25, 21:59 UTC2h 24m
2026-07-25 AAL1125 MIA → BAQ Jul 25, 15:55 UTCJul 25, 18:10 UTC2h 15m
2026-07-25 AAL1125 MIA → BAQ Jul 25, 15:53 UTCJul 25, 18:09 UTC2h 16m
2026-07-25 AAL1716 IND → CLT Jul 25, 10:25 UTCJul 25, 12:45 UTC2h 20m
2026-07-25 AAL3049 STL → PHL Jul 25, 04:00 UTCJul 25, 05:15 UTC1h 15m
2026-07-24 AAL1571 PHX → PHL Jul 24, 22:55 UTCJul 25, 01:55 UTC3h 0m
2026-07-24 AAL1571 PHX → PHL Jul 24, 22:53 UTCJul 25, 01:54 UTC3h 1m
2026-07-24 AAL2302 LGA → ORD Jul 24, 19:35 UTCJul 24, 21:00 UTC1h 25m
2026-07-24 AAL2302 LGA → ORD Jul 24, 19:34 UTCJul 24, 21:30 UTC1h 56m
2026-07-24 AAL2302 LGA → ORD Jul 24, 16:15 UTCJul 24, 18:05 UTC1h 50m
2026-07-24 AAL3096 CLT → STL Jul 24, 11:50 UTCJul 24, 14:45 UTC2h 55m
2026-07-24 AAL2307 IAH → PHL Jul 24, 01:35 UTCJul 24, 03:50 UTC2h 15m
2026-07-23 AAL2307 IAH → PHL Jul 23, 22:20 UTCJul 24, 00:30 UTC2h 10m
2026-07-23 AAL1441 CLT → BOS Jul 23, 17:00 UTCJul 23, 20:00 UTC3h 0m
2026-07-23 AAL1441 CLT → BOS Jul 23, 16:59 UTCJul 23, 20:03 UTC3h 4m
2026-07-23 AAL1822 PHL → CLT Jul 23, 12:55 UTCJul 23, 15:35 UTC2h 40m
2026-07-23 AAL1822 PHL → CLT Jul 23, 12:53 UTCJul 23, 15:32 UTC2h 39m
2026-07-23 AAL1737 PHL → MIA Jul 23, 07:40 UTCJul 23, 11:05 UTC3h 25m
2026-07-23 AAL1737 PHL → MIA Jul 23, 02:45 UTCJul 23, 06:25 UTC3h 40m
2026-07-22 AAL2581 - Jul 22, 21:05 UTCJul 22, 23:20 UTC2h 15m
2026-07-22 AAL2581 SJU → MIA Jul 22, 21:02 UTCJul 22, 23:14 UTC2h 12m
2026-07-22 AAL2581 - Jul 22, 19:20 UTCJul 22, 19:35 UTC15m
2026-07-22 AAL2581 - Jul 22, 17:20 UTCJul 22, 17:45 UTC25m
2026-07-22 AAL902 CID → DFW Jul 22, 13:15 UTCJul 22, 15:15 UTC2h 0m
2026-07-21 AAL901 PHL → PIT Jul 21, 23:45 UTCJul 22, 01:05 UTC1h 20m
2026-07-21 AAL901 PHL → PIT Jul 21, 23:42 UTCJul 22, 01:59 UTC2h 17m
2026-07-21 AAL3034 MIA → DCA Jul 21, 14:55 UTCJul 21, 20:40 UTC5h 45m
2026-07-21 AAL892 PIT → DFW Jul 21, 10:25 UTCJul 21, 13:00 UTC2h 35m
2026-07-21 AAL670 PVD → ORD Jul 21, 01:55 UTCJul 21, 04:40 UTC2h 45m
2026-07-20 AAL2963 - Jul 20, 23:20 UTCJul 20, 23:55 UTC34m
2026-07-20 AAL2890 - Jul 20, 18:10 UTCJul 20, 20:25 UTC2h 15m
2026-07-20 AAL2890 DFW → MBJ Jul 20, 18:06 UTCJul 20, 21:20 UTC3h 14m
2026-07-20 AAL479 CLT → ALB Jul 20, 13:20 UTCJul 20, 16:45 UTC3h 25m
2026-07-20 AAL2303 - Jul 20, 00:05 UTCJul 20, 01:50 UTC1h 45m
2026-07-20 AAL2303 ORD → BOS Jul 20, 00:02 UTCJul 20, 01:49 UTC1h 47m
2026-07-19 AAL2907 PHL → SRQ Jul 19, 20:00 UTCJul 19, 22:25 UTC2h 25m
2026-07-19 AAL3080 - Jul 19, 16:30 UTCJul 19, 18:20 UTC1h 50m
2026-07-19 AAL3080 - Jul 19, 13:35 UTCJul 19, 14:55 UTC1h 20m
2026-07-19 AAL1585 - Jul 19, 10:20 UTCJul 19, 12:00 UTC1h 40m
2026-07-19 AAL1293 - Jul 19, 02:20 UTCJul 19, 04:05 UTC1h 45m
2026-07-18 AAL3039 SAN → DFW Jul 18, 20:50 UTCJul 19, 00:20 UTC3h 30m
2026-07-18 AAL2020 - Jul 18, 15:20 UTCJul 18, 18:20 UTC3h 0m
2026-07-18 AAL354 - Jul 18, 10:40 UTCJul 18, 12:55 UTC2h 15m

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 N873NN page for operator, model, and routing details .

Mode-S AC02B4 frequently asked

What is Mode-S code AC02B4?
AC02B4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N873NN.
Where is Mode-S AC02B4 registered?
Mode-S code AC02B4 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 AC02B4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC02B4, octal 53001264, decimal 11,272,884.
What flights does AC02B4 operate?
Mode-S AC02B4 has broadcast 20 distinct callsigns, including AAL1014, AAL1936, AAL1177, AAL357, AAL3267.