Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC51B2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N893NN · BOEING 737-800 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
AC51B2
Octal
53050662
Decimal
11,293,106
Country
US
Tail
N893NN
Type
B738
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
531
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AC51B2.

Country allocation

The ICAO 24-bit address AC51B2 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
AAL1935 - 7 2026-07-16
AAL1868 - 6 2026-07-04
AAL1786 - 6 2026-07-19
AAL2822 American Airlines 5 2026-06-08
AAL2152 - 5 2026-07-06
AAL1946 - 5 2026-07-01
AAL1713 American Airlines 5 2026-07-23
AAL1697 - 5 2026-07-05
AAL977 American Airlines 4 2026-04-13
AAL398 - 4 2026-07-07
AAL2987 American Airlines 4 2026-04-17
AAL2582 - 4 2026-07-13
AAL2509 - 4 2026-07-17
AAL2095 - 4 2026-06-17
AAL2020 American Airlines 4 2026-06-06
AAL1624 - 4 2026-07-15
AAL1352 - 4 2026-07-07
AAL611 American Airlines 3 2026-05-07
AAL525 - 3 2026-06-19
AAL496 American Airlines 3 2026-04-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2477 STL → CLT Jul 26, 20:40 UTCJul 26, 21:35 UTC55m
2026-07-26 AAL2477 STL → CLT Jul 26, 18:05 UTCJul 26, 18:55 UTC50m
2026-07-24 AAL2639 ORD → SFO Jul 24, 02:15 UTCJul 24, 03:10 UTC55m
2026-07-24 AAL2639 ORD → SFO Jul 24, 00:10 UTCJul 24, 00:55 UTC45m
2026-07-23 AAL554 PHL → ORD Jul 23, 20:50 UTCJul 23, 22:45 UTC1h 55m
2026-07-23 AAL1713 CLT → PHL Jul 23, 15:40 UTCJul 23, 17:25 UTC1h 45m
2026-07-23 AAL1713 CLT → PHL Jul 23, 15:34 UTCJul 23, 17:30 UTC1h 56m
2026-07-23 AAL1713 CLT → PHL Jul 23, 12:30 UTCJul 23, 14:20 UTC1h 50m
2026-07-22 AAL9784 SFO → LAS Jul 22, 23:20 UTCJul 23, 01:40 UTC2h 20m
2026-07-22 AAL9784 SFO → LAS Jul 22, 23:15 UTCJul 23, 01:35 UTC2h 20m
2026-07-20 AAL1682 DCA → ORD Jul 20, 21:45 UTCJul 21, 00:00 UTC2h 14m
2026-07-20 AAL1164 LGA → STL Jul 20, 14:35 UTCJul 20, 20:10 UTC5h 35m
2026-07-20 AAL3329 - Jul 20, 10:30 UTCJul 20, 12:45 UTC2h 15m
2026-07-20 AAL1761 DFW → PIT Jul 20, 02:55 UTCJul 20, 05:15 UTC2h 20m
2026-07-20 AAL1761 DFW → PIT Jul 20, 02:51 UTCJul 20, 05:09 UTC2h 18m
2026-07-19 AAL584 DFW → TUS Jul 19, 23:30 UTCJul 20, 01:25 UTC1h 55m
2026-07-19 AAL584 DFW → TUS Jul 19, 20:20 UTCJul 19, 22:05 UTC1h 45m
2026-07-19 AAL2747 MKE → PHX Jul 19, 16:15 UTCJul 19, 18:55 UTC2h 40m
2026-07-19 AAL2747 MKE → PHX Jul 19, 12:20 UTCJul 19, 14:55 UTC2h 35m
2026-07-19 AAL1786 - Jul 19, 02:10 UTCJul 19, 04:20 UTC2h 10m
2026-07-19 AAL1786 DTW → DFW Jul 19, 02:06 UTCJul 19, 04:20 UTC2h 14m
2026-07-18 AAL1786 - Jul 18, 22:25 UTCJul 19, 00:45 UTC2h 20m
2026-07-18 AAL390 - Jul 18, 17:45 UTCJul 18, 20:00 UTC2h 15m
2026-07-18 AAL390 MEX → DFW Jul 18, 17:44 UTCJul 18, 19:56 UTC2h 12m
2026-07-18 AAL389 DFW → MEX Jul 18, 14:00 UTCJul 18, 16:10 UTC2h 10m
2026-07-18 AAL389 DFW → MEX Jul 18, 13:58 UTCJul 18, 16:07 UTC2h 9m
2026-07-18 AAL2266 - Jul 18, 11:20 UTCJul 18, 12:05 UTC45m
2026-07-18 AAL2266 SAT → DFW Jul 18, 11:16 UTCJul 18, 12:00 UTC44m
2026-07-18 AAL3097 DFW → SAT Jul 18, 03:25 UTCJul 18, 04:05 UTC40m
2026-07-18 AAL3097 DFW → SAT Jul 18, 03:25 UTCJul 18, 04:05 UTC40m
2026-07-17 AAL2265 - Jul 17, 23:05 UTCJul 18, 01:34 UTC2h 30m
2026-07-17 AAL2265 ORF → DFW Jul 17, 23:01 UTCJul 18, 01:34 UTC2h 33m
2026-07-17 AAL2265 DFW → ORF Jul 17, 19:09 UTCJul 17, 21:44 UTC2h 35m
2026-07-17 AAL1713 - Jul 17, 15:29 UTCJul 17, 17:15 UTC1h 45m
2026-07-17 AAL1713 DFW → CVG Jul 17, 12:25 UTCJul 17, 14:15 UTC1h 50m
2026-07-17 AAL2509 SAV → DFW Jul 17, 03:59 UTCJul 17, 06:05 UTC2h 5m
2026-07-17 AAL2509 DFW → SAV Jul 17, 00:50 UTCJul 17, 02:54 UTC2h 5m
2026-07-16 AAL1935 - Jul 16, 18:34 UTCJul 16, 18:59 UTC25m
2026-07-16 AAL1935 - Jul 16, 17:54 UTCJul 16, 18:59 UTC1h 5m
2026-07-16 AAL1935 MEM → DFW Jul 16, 17:53 UTCJul 16, 18:16 UTC23m
2026-07-16 AAL1935 - Jul 16, 15:19 UTCJul 16, 16:15 UTC55m
2026-07-16 AAL3291 INT → DFW Jul 16, 11:40 UTCJul 16, 13:49 UTC2h 10m
2026-07-16 AAL1316 - Jul 16, 01:15 UTCJul 16, 03:20 UTC2h 5m
2026-07-15 AAL1624 - Jul 15, 23:35 UTCJul 15, 23:45 UTC10m
2026-07-15 AAL1624 DCA → AFW Jul 15, 19:20 UTCJul 15, 22:10 UTC2h 50m
2026-07-15 AAL2088 MCO → DCA Jul 15, 15:00 UTCJul 15, 16:55 UTC1h 55m
2026-07-15 AAL3173 DFW → MCO Jul 15, 11:25 UTCJul 15, 13:40 UTC2h 15m
2026-07-14 AAL1438 - Jul 14, 22:25 UTCJul 15, 01:30 UTC3h 4m
2026-07-14 AAL1438 - Jul 14, 17:40 UTCJul 14, 20:55 UTC3h 15m
2026-07-14 AAL782 - Jul 14, 14:15 UTCJul 14, 15:40 UTC1h 25m

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 N893NN page for operator, model, and routing details .

Mode-S AC51B2 frequently asked

What is Mode-S code AC51B2?
AC51B2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N893NN.
Where is Mode-S AC51B2 registered?
Mode-S code AC51B2 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 AC51B2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC51B2, octal 53050662, decimal 11,293,106.
What flights does AC51B2 operate?
Mode-S AC51B2 has broadcast 20 distinct callsigns, including AAL1935, AAL1868, AAL1786, AAL2822, AAL2152.