Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ABAFE4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N852ML · BOEING 787-9 Dreamliner · operated by BOEING CO

Hex
ABAFE4
Octal
52727744
Decimal
11,251,684
Country
US
Tail
N852ML
Type
B789
Broadcasting now · callsign AAL21 · 38,000 ft
Flights observed
270
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:10 UTC

Current position

ABAFE4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ABAFE4 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
AAL135 American Airlines 20 2026-07-26
AAL50 American Airlines 19 2026-07-25
AAL86 - 17 2026-07-11
AAL737 - 17 2026-07-04
AAL91 - 16 2026-06-28
AAL728 - 16 2026-07-05
AAL101 American Airlines 16 2026-07-23
AAL55 - 15 2026-07-10
AAL54 - 15 2026-06-29
AAL98 American Airlines 14 2026-06-04
AAL87 American Airlines 14 2026-06-14
AAL736 - 14 2026-07-06
AAL729 - 14 2026-07-05
AAL21 American Airlines 13 2026-07-24
AAL100 American Airlines 12 2026-07-23
AAL134 American Airlines 10 2026-07-22
AAL106 American Airlines 10 2026-06-05
AAL105 American Airlines 10 2026-06-04
AAL136 American Airlines 4 2026-05-19
AAL9796 American Airlines 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL135 LHR → LAX Jul 26, 07:40 UTCJul 26, 18:10 UTC10h 30m
2026-07-26 AAL135 LHR → LAX Jul 26, 07:38 UTCJul 26, 18:05 UTC10h 27m
2026-07-25 AAL50 DFW → LHR Jul 25, 20:25 UTCJul 26, 05:25 UTC9h 0m
2026-07-24 AAL21 LHR → DFW Jul 24, 15:00 UTCJul 24, 18:50 UTC3h 50m
2026-07-24 AAL21 LHR → DFW Jul 24, 09:40 UTCJul 24, 14:55 UTC5h 15m
2026-07-24 AAL21 LHR → DFW Jul 24, 09:35 UTCJul 24, 18:49 UTC9h 14m
2026-07-23 AAL100 JFK → LHR Jul 23, 22:55 UTCJul 24, 05:05 UTC6h 10m
2026-07-23 AAL101 LHR → JFK Jul 23, 11:45 UTCJul 23, 18:30 UTC6h 45m
2026-07-23 AAL101 LHR → JFK Jul 23, 11:41 UTCJul 23, 18:25 UTC6h 44m
2026-07-22 AAL134 LAX → LHR Jul 22, 23:35 UTCJul 23, 09:25 UTC9h 50m
2026-07-22 AAL135 LHR → LAX Jul 22, 13:05 UTCJul 22, 17:50 UTC4h 45m
2026-07-21 AAL50 DFW → LHR Jul 21, 20:30 UTCJul 22, 05:20 UTC8h 50m
2026-07-20 AAL21 LHR → DFW Jul 20, 11:30 UTCJul 20, 20:35 UTC9h 5m
2026-07-19 AAL134 LAX → LHR Jul 19, 23:40 UTCJul 20, 09:00 UTC9h 20m
2026-07-19 AAL134 LAX → LHR Jul 19, 23:39 UTCJul 20, 09:07 UTC9h 28m
2026-07-19 AAL135 - Jul 19, 07:35 UTCJul 19, 17:35 UTC10h 0m
2026-07-18 AAL50 - Jul 18, 20:20 UTCJul 19, 05:00 UTC8h 40m
2026-07-18 AAL50 DFW → LHR Jul 18, 20:19 UTCJul 19, 05:12 UTC8h 53m
2026-07-16 AAL21 - Jul 16, 10:04 UTCJul 16, 19:30 UTC9h 25m
2026-07-15 AAL50 DFW → LHR Jul 15, 21:20 UTCJul 16, 06:25 UTC9h 5m
2026-07-15 AAL50 - Jul 15, 21:25 UTCJul 16, 00:05 UTC2h 40m
2026-07-12 AAL21 LHR → DFW Jul 12, 09:25 UTCJul 12, 18:30 UTC9h 5m
2026-07-12 AAL100 JFK → LHR Jul 12, 00:22 UTCJul 12, 06:35 UTC6h 13m
2026-07-12 AAL100 JFK → LHR Jul 12, 00:25 UTCJul 12, 06:35 UTC6h 10m
2026-07-11 AAL101 LHR → JFK Jul 11, 09:55 UTCJul 11, 17:00 UTC7h 5m
2026-07-11 AAL86 - Jul 11, 00:15 UTCJul 11, 07:20 UTC7h 5m
2026-07-11 AAL86 ORD → LHR Jul 11, 00:14 UTCJul 11, 07:08 UTC6h 54m
2026-07-10 AAL55 LHR → ORD Jul 10, 11:55 UTCJul 10, 20:00 UTC8h 5m
2026-07-09 AAL134 - Jul 9, 23:30 UTCJul 10, 09:30 UTC10h 0m
2026-07-09 AAL135 - Jul 9, 07:40 UTCJul 9, 18:05 UTC10h 25m
2026-07-08 AAL100 JFK → LHR Jul 8, 22:35 UTCJul 9, 05:05 UTC6h 30m
2026-07-08 AAL101 - Jul 8, 09:50 UTCJul 8, 16:45 UTC6h 55m
2026-07-07 AAL100 JFK → LHR Jul 7, 23:00 UTCJul 8, 05:15 UTC6h 15m
2026-07-07 AAL101 - Jul 7, 09:50 UTCJul 7, 16:50 UTC7h 0m
2026-07-06 AAL86 - Jul 6, 23:30 UTCJul 7, 06:45 UTC7h 15m
2026-07-06 AAL86 ORD → LHR Jul 6, 23:30 UTCJul 7, 06:32 UTC7h 2m
2026-07-06 AAL55 - Jul 6, 11:35 UTCJul 6, 19:25 UTC7h 50m
2026-07-06 AAL736 - Jul 6, 02:40 UTCJul 6, 09:25 UTC6h 45m
2026-07-06 AAL736 PHL → PHL Jul 6, 02:25 UTCJul 6, 02:30 UTC5m
2026-07-05 AAL729 - Jul 5, 08:55 UTCJul 5, 16:10 UTC7h 15m
2026-07-05 AAL728 PHL → LHR Jul 5, 00:10 UTCJul 5, 06:30 UTC6h 20m
2026-07-04 AAL737 - Jul 4, 11:50 UTCJul 4, 19:00 UTC7h 10m
2026-07-04 AAL737 LHR → PHL Jul 4, 11:47 UTCJul 4, 19:09 UTC7h 22m
2026-07-03 AAL134 - Jul 3, 23:30 UTCJul 4, 09:20 UTC9h 50m
2026-07-03 AAL135 LHR → LAX Jul 3, 09:15 UTCJul 3, 19:35 UTC10h 20m
2026-07-02 AAL50 DFW → LHR Jul 2, 20:25 UTCJul 3, 05:05 UTC8h 40m
2026-07-01 AAL21 - Jul 1, 09:35 UTCJul 1, 18:55 UTC9h 20m
2026-07-01 AAL21 LHR → DFW Jul 1, 09:31 UTCJul 1, 18:56 UTC9h 25m
2026-06-30 AAL100 - Jun 30, 22:30 UTCJul 1, 05:05 UTC6h 35m
2026-06-30 AAL101 - Jun 30, 09:45 UTCJun 30, 10:55 UTC1h 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 N852ML page for operator, model, and routing details .

Mode-S ABAFE4 frequently asked

What is Mode-S code ABAFE4?
ABAFE4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N852ML.
Where is Mode-S ABAFE4 registered?
Mode-S code ABAFE4 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 ABAFE4 broadcasting right now?
Yes. Mode-S ABAFE4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAFE4, octal 52727744, decimal 11,251,684.
What flights does ABAFE4 operate?
Mode-S ABAFE4 has broadcast 20 distinct callsigns, including AAL135, AAL50, AAL86, AAL737, AAL91.