Apparatus

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sensors Mode-S transponder

AD4873

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N955NN · BOEING 737-800 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
AD4873
Octal
53244163
Decimal
11,356,275
Country
US
Tail
N955NN
Type
B738
Broadcasting now · callsign AAL1904 · 35,000 ft
Flights observed
502
Distinct callsigns
20
Country
US
Last broadcast
36m ago

Current position

AD4873 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AD4873 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
AAL2460 - 6 2026-07-12
AAL2302 - 6 2026-07-13
AAL1386 - 6 2026-07-11
AAL496 - 5 2026-07-03
AAL1699 American Airlines 5 2026-05-02
AAL939 - 4 2026-07-03
AAL635 American Airlines 4 2026-05-27
AAL463 - 4 2026-07-10
AAL388 - 4 2026-07-06
AAL2169 American Airlines 4 2026-05-26
AAL2165 - 4 2026-07-06
AAL1744 American Airlines 4 2026-05-29
AAL903 American Airlines 3 2026-05-13
AAL874 American Airlines 3 2026-04-23
AAL3216 - 3 2026-06-26
AAL3175 American Airlines 3 2026-05-07
AAL3106 American Airlines 3 2026-05-29
AAL310 American Airlines 3 2026-06-17
AAL3069 American Airlines 3 2026-04-25
AAL3053 American Airlines 3 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL1904 - Jul 14, 20:25 UTCJul 14, 20:45 UTC20m
2026-07-14 AAL1324 DFW → DFW Jul 14, 12:50 UTCJul 14, 18:25 UTC5h 35m
2026-07-14 AAL1571 LGA → DFW Jul 14, 00:10 UTCJul 14, 03:10 UTC3h 0m
2026-07-13 AAL2302 BNA → LGA Jul 13, 20:45 UTCJul 13, 22:40 UTC1h 55m
2026-07-13 AAL2302 BNA → LGA Jul 13, 20:43 UTCJul 13, 22:41 UTC1h 58m
2026-07-13 AAL2302 LGA → BNA Jul 13, 17:25 UTCJul 13, 19:15 UTC1h 50m
2026-07-13 AAL3096 - Jul 13, 13:00 UTCJul 13, 16:05 UTC3h 5m
2026-07-13 AAL1728 - Jul 13, 02:35 UTCJul 13, 04:30 UTC1h 55m
2026-07-12 AAL1728 - Jul 12, 22:35 UTCJul 13, 00:25 UTC1h 50m
2026-07-12 AAL2460 - Jul 12, 18:15 UTCJul 12, 18:45 UTC30m
2026-07-12 AAL2460 VPS → DFW Jul 12, 18:16 UTCJul 12, 20:24 UTC2h 8m
2026-07-12 AAL2460 - Jul 12, 15:30 UTCJul 12, 16:55 UTC1h 25m
2026-07-12 AAL2435 SAV → DFW Jul 12, 11:55 UTCJul 12, 14:15 UTC2h 20m
2026-07-12 AAL2327 - Jul 12, 01:25 UTCJul 12, 02:45 UTC1h 20m
2026-07-12 AAL2327 DFW → SAV Jul 12, 01:23 UTCJul 12, 03:23 UTC2h 0m
2026-07-11 AAL1956 - Jul 11, 21:45 UTCJul 11, 23:35 UTC1h 50m
2026-07-11 AAL1956 - Jul 11, 19:10 UTCJul 11, 20:45 UTC1h 35m
2026-07-11 AAL2814 TPA → DFW Jul 11, 15:45 UTCJul 11, 17:50 UTC2h 5m
2026-07-11 AAL2814 - Jul 11, 12:20 UTCJul 11, 14:30 UTC2h 10m
2026-07-11 AAL1386 ATL → DFW Jul 11, 04:20 UTCJul 11, 06:20 UTC2h 0m
2026-07-11 AAL1386 ATL → DFW Jul 11, 04:20 UTCJul 11, 06:15 UTC1h 55m
2026-07-11 AAL3212 DFW → ATL Jul 11, 01:20 UTCJul 11, 03:01 UTC1h 40m
2026-07-11 AAL3212 DFW → ATL Jul 11, 01:20 UTCJul 11, 03:01 UTC1h 41m
2026-07-10 AAL314 - Jul 10, 21:05 UTCJul 10, 23:30 UTC2h 25m
2026-07-10 AAL314 BZE → DFW Jul 10, 20:47 UTCJul 10, 23:25 UTC2h 38m
2026-07-10 AAL2797 - Jul 10, 18:00 UTCJul 10, 19:30 UTC1h 30m
2026-07-10 AAL2797 MIA → BZE Jul 10, 17:57 UTCJul 10, 19:45 UTC1h 48m
2026-07-10 AAL850 GUA → MIA Jul 10, 13:55 UTCJul 10, 16:10 UTC2h 15m
2026-07-10 AAL463 DFW → GUA Jul 10, 04:05 UTCJul 10, 06:57 UTC2h 52m
2026-07-10 AAL463 DFW → GUA Jul 10, 04:10 UTCJul 10, 07:00 UTC2h 50m
2026-07-10 AAL2194 MSY → DFW Jul 10, 00:00 UTCJul 10, 01:10 UTC1h 10m
2026-07-09 AAL2194 RBD → MSY Jul 9, 21:45 UTCJul 9, 22:50 UTC1h 5m
2026-07-09 AAL2460 VPS → DFW Jul 9, 17:45 UTCJul 9, 19:20 UTC1h 35m
2026-07-09 AAL2460 VPS → DFW Jul 9, 17:40 UTCJul 9, 19:14 UTC1h 34m
2026-07-09 AAL2460 DFW → VPS Jul 9, 15:00 UTCJul 9, 16:30 UTC1h 30m
2026-07-09 AAL3291 - Jul 9, 10:55 UTCJul 9, 13:20 UTC2h 25m
2026-07-09 AAL1316 - Jul 9, 00:40 UTCJul 9, 02:50 UTC2h 10m
2026-07-09 AAL1316 DFW → GSO Jul 9, 00:38 UTCJul 9, 02:48 UTC2h 10m
2026-07-08 AAL2145 MSP → DFW Jul 8, 20:45 UTCJul 8, 22:40 UTC1h 55m
2026-07-08 AAL2145 - Jul 8, 17:05 UTCJul 8, 19:20 UTC2h 15m
2026-07-08 AAL1189 TPA → DFW Jul 8, 13:25 UTCJul 8, 15:40 UTC2h 15m
2026-07-07 AAL2845 LGA → TPA Jul 7, 20:40 UTCJul 7, 23:20 UTC2h 40m
2026-07-07 AAL2490 - Jul 7, 16:15 UTCJul 7, 18:50 UTC2h 35m
2026-07-07 AAL2490 LGA → FLL Jul 7, 12:15 UTCJul 7, 14:40 UTC2h 25m
2026-07-07 AAL2302 - Jul 7, 02:20 UTCJul 7, 04:10 UTC1h 50m
2026-07-06 AAL2302 LGA → BNA Jul 6, 22:49 UTCJul 7, 00:52 UTC2h 3m
2026-07-06 AAL2302 LGA → BNA Jul 6, 22:50 UTCJul 7, 00:55 UTC2h 5m
2026-07-06 AAL388 - Jul 6, 19:50 UTCJul 6, 20:25 UTC35m
2026-07-06 AAL388 MDT → LGA Jul 6, 19:32 UTCJul 6, 20:25 UTC53m
2026-07-06 AAL388 - Jul 6, 16:05 UTCJul 6, 18:05 UTC2h 0m

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 N955NN page for operator, model, and routing details .

Mode-S AD4873 frequently asked

What is Mode-S code AD4873?
AD4873 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N955NN.
Where is Mode-S AD4873 registered?
Mode-S code AD4873 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 AD4873 broadcasting right now?
Yes. Mode-S AD4873 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4873, octal 53244163, decimal 11,356,275.
What flights does AD4873 operate?
Mode-S AD4873 has broadcast 20 distinct callsigns, including AAL2460, AAL2302, AAL1386, AAL496, AAL1699.