Apparatus

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sensors Mode-S transponder

ADCA15

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N988NN · BOEING 737-800 · operated by AMERICAN AIRLINES INC

Hex
ADCA15
Octal
53345025
Decimal
11,389,461
Country
US
Tail
N988NN
Type
B738
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
508
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S ADCA15.

Country allocation

The ICAO 24-bit address ADCA15 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
AAL2709 - 6 2026-06-27
AAL2425 - 6 2026-06-27
AAL1868 - 6 2026-06-13
AAL1645 - 6 2026-07-03
AAL1573 - 6 2026-07-09
AAL814 American Airlines 5 2026-06-07
AAL3002 American Airlines 5 2026-05-15
AAL1890 - 5 2026-07-15
AAL831 - 4 2026-07-04
AAL3106 American Airlines 4 2026-07-18
AAL2447 American Airlines 4 2026-04-22
AAL2267 American Airlines 4 2026-05-02
AAL1945 - 4 2026-06-29
AAL1930 - 4 2026-07-16
AAL1856 American Airlines 4 2026-06-19
AAL1233 American Airlines 4 2026-07-23
AAL3237 American Airlines 3 2026-04-30
AAL3216 American Airlines 3 2026-06-03
AAL3208 American Airlines 3 2026-04-27
AAL3104 American Airlines 3 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL396 LGA → ORD Jul 26, 20:25 UTCJul 26, 21:15 UTC50m
2026-07-26 AAL2490 LAX → DFW Jul 26, 16:20 UTCJul 26, 17:15 UTC55m
2026-07-26 AAL2490 LAX → DFW Jul 26, 16:17 UTCJul 26, 18:50 UTC2h 33m
2026-07-26 AAL2490 LAX → DFW Jul 26, 12:20 UTCJul 26, 14:55 UTC2h 35m
2026-07-25 AAL952 PHL → DFW Jul 25, 22:10 UTCJul 26, 00:40 UTC2h 30m
2026-07-25 AAL2915 TPA → CLT Jul 25, 18:45 UTCJul 25, 20:50 UTC2h 5m
2026-07-25 AAL2915 TPA → CLT Jul 25, 14:10 UTCJul 25, 16:25 UTC2h 15m
2026-07-25 AAL2817 DCA → DFW Jul 25, 10:10 UTCJul 25, 12:30 UTC2h 20m
2026-07-25 AAL1364 PHL → ATL Jul 25, 02:20 UTCJul 25, 02:35 UTC15m
2026-07-25 AAL1364 PHL → ATL Jul 25, 00:25 UTCJul 25, 00:50 UTC25m
2026-07-24 AAL1600 SJO → MIA Jul 24, 20:10 UTCJul 24, 22:30 UTC2h 20m
2026-07-24 AAL1593 BOS → CLT Jul 24, 16:20 UTCJul 24, 18:50 UTC2h 30m
2026-07-24 AAL3154 DFW → CMH Jul 24, 12:25 UTCJul 24, 14:40 UTC2h 15m
2026-07-23 AAL2657 SEA → DFW Jul 23, 23:45 UTCJul 24, 01:40 UTC1h 55m
2026-07-23 AAL438 SFO → ORD Jul 23, 19:49 UTCJul 23, 21:58 UTC2h 9m
2026-07-23 AAL939 CMH → PHL Jul 23, 16:50 UTCJul 23, 21:15 UTC4h 25m
2026-07-23 AAL243 HAV → MIA Jul 23, 14:45 UTCJul 23, 15:15 UTC30m
2026-07-23 AAL242 MIA → HAV Jul 23, 12:25 UTCJul 23, 12:55 UTC30m
2026-07-23 AAL1233 PHL → MIA Jul 23, 01:42 UTCJul 23, 03:55 UTC2h 13m
2026-07-23 AAL1233 PHL → MIA Jul 23, 01:45 UTCJul 23, 04:00 UTC2h 15m
2026-07-22 AAL3101 DFW → DTW Jul 22, 20:15 UTCJul 22, 22:45 UTC2h 30m
2026-07-22 AAL3101 DFW → DTW Jul 22, 20:12 UTCJul 22, 22:39 UTC2h 27m
2026-07-22 AAL1935 - Jul 22, 17:20 UTCJul 22, 18:25 UTC1h 5m
2026-07-22 AAL1935 - Jul 22, 14:50 UTCJul 22, 15:50 UTC1h 0m
2026-07-22 AAL1561 EWR → DFW Jul 22, 11:20 UTCJul 22, 13:30 UTC2h 10m
2026-07-22 AAL981 LAX → PHL Jul 22, 01:20 UTCJul 22, 03:20 UTC2h 0m
2026-07-21 AAL1695 CLT → DFW Jul 21, 22:05 UTCJul 21, 23:25 UTC1h 20m
2026-07-21 AAL1695 CLT → DFW Jul 21, 19:30 UTCJul 21, 20:55 UTC1h 25m
2026-07-21 AAL2124 MCO → DFW Jul 21, 15:30 UTCJul 21, 17:45 UTC2h 15m
2026-07-21 AAL3273 DFW → LAX Jul 21, 11:55 UTCJul 21, 13:35 UTC1h 40m
2026-07-21 AAL3273 DFW → LAX Jul 21, 11:50 UTCJul 21, 13:35 UTC1h 45m
2026-07-21 AAL2648 MIA → DCA Jul 21, 02:05 UTCJul 21, 02:45 UTC40m
2026-07-21 AAL2648 MIA → DCA Jul 21, 00:25 UTCJul 21, 02:00 UTC1h 35m
2026-07-20 AAL3265 BDL → DFW Jul 20, 19:50 UTCJul 20, 22:15 UTC2h 25m
2026-07-20 AAL3265 BDL → DFW Jul 20, 19:49 UTCJul 20, 22:11 UTC2h 22m
2026-07-20 AAL2344 MIA → ORD Jul 20, 14:55 UTCJul 20, 18:00 UTC3h 5m
2026-07-19 AAL3158 SAF → DFW Jul 19, 22:45 UTCJul 20, 02:05 UTC3h 20m
2026-07-19 AAL1684 PHL → MCO Jul 19, 18:20 UTCJul 19, 20:50 UTC2h 30m
2026-07-19 AAL512 ATL → MIA Jul 19, 14:55 UTCJul 19, 16:35 UTC1h 40m
2026-07-19 AAL512 - Jul 19, 12:00 UTCJul 19, 13:25 UTC1h 25m
2026-07-19 AAL1480 HNL → LAX Jul 19, 05:45 UTCJul 19, 10:30 UTC4h 45m
2026-07-18 AAL1160 - Jul 18, 21:45 UTCJul 19, 01:25 UTC3h 40m
2026-07-18 AAL1160 ORD → SAN Jul 18, 21:44 UTCJul 19, 01:25 UTC3h 41m
2026-07-18 AAL3106 IAH → ORD Jul 18, 17:40 UTCJul 18, 20:05 UTC2h 25m
2026-07-18 AAL3106 IAH → ORD Jul 18, 17:38 UTCJul 18, 20:07 UTC2h 29m
2026-07-16 AAL1930 - Jul 16, 12:05 UTCJul 16, 14:00 UTC1h 55m
2026-07-16 AAL1930 CLT → IAH Jul 16, 12:00 UTCJul 16, 14:00 UTC2h 0m
2026-07-16 AAL429 - Jul 16, 09:20 UTCJul 16, 10:15 UTC55m
2026-07-16 AAL626 - Jul 16, 02:35 UTCJul 16, 03:30 UTC55m
2026-07-15 AAL1408 - Jul 15, 22:45 UTCJul 16, 00:55 UTC2h 10m

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 N988NN page for operator, model, and routing details .

Mode-S ADCA15 frequently asked

What is Mode-S code ADCA15?
ADCA15 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N988NN.
Where is Mode-S ADCA15 registered?
Mode-S code ADCA15 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 ADCA15 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADCA15, octal 53345025, decimal 11,389,461.
What flights does ADCA15 operate?
Mode-S ADCA15 has broadcast 20 distinct callsigns, including AAL2709, AAL2425, AAL1868, AAL1645, AAL1573.