sensors Mode-S transponder

A1CF6B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2157J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A1CF6B
Octal
50347553
Decimal
10,604,395
Country
US
Tail
N2157J
Type
A21N
Broadcasting now · callsign JBU1634 · 36,975 ft
Flights observed
140
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A1CF6B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1CF6B 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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JBU488 MCO → ORH May 29, 05:08 UTCMay 30, 00:45 UTC19h 38m
2026-05-28 JBU823 JFK → LAX May 28, 22:01 UTCMay 29, 20:40 UTC22h 39m
2026-05-28 JBU72 SLC → JFK May 28, 12:06 UTCMay 29, 10:20 UTC22h 14m
2026-05-28 JBU72 SLC → JFK May 28, 12:10 UTCMay 28, 19:00 UTC6h 50m
2026-05-28 JBU1079 JFK → MBJ May 28, 03:50 UTCMay 28, 10:00 UTC6h 10m
2026-05-27 JBU734 SFO → BOS May 27, 20:35 UTCMay 28, 01:45 UTC5h 10m
2026-05-27 JBU1833 BOS → SFO May 27, 12:30 UTCMay 27, 18:30 UTC6h 0m
2026-05-26 JBU734 SFO → BOS May 26, 20:50 UTCMay 27, 00:44 UTC3h 55m
2026-05-26 JBU1833 BOS → SFO May 26, 13:00 UTCMay 26, 18:55 UTC5h 55m
2026-05-26 JBU488 MCO → ORH May 26, 05:15 UTCMay 26, 10:10 UTC4h 55m
2026-05-25 JBU823 JFK → LAX May 25, 22:00 UTCMay 26, 03:25 UTC5h 25m
2026-05-25 JBU1079 JFK → MBJ May 25, 03:10 UTCMay 26, 02:44 UTC23h 35m
2026-05-24 JBU834 SFO → BOS May 24, 19:40 UTCMay 24, 23:46 UTC4h 6m
2026-05-24 JBU834 SFO → BOS May 24, 19:38 UTCMay 25, 18:45 UTC23h 8m
2026-05-24 JBU1333 BOS → SFO May 24, 11:30 UTCMay 24, 17:30 UTC6h 0m
2026-05-23 JBU734 SFO → BOS May 23, 20:25 UTCMay 24, 01:35 UTC5h 10m
2026-05-23 JBU1833 BOS → SFO May 23, 12:45 UTCMay 23, 19:00 UTC6h 16m
2026-05-23 JBU1488 LAX → BOS May 23, 03:55 UTCMay 23, 09:00 UTC5h 5m
2026-05-22 JBU487 BOS → LAX May 22, 20:05 UTCMay 23, 01:50 UTC5h 45m
2026-05-22 JBU353 JFK → BUR May 22, 01:31 UTCMay 23, 00:45 UTC23h 15m
2026-05-21 JBU1080 EDI → BOS May 21, 12:35 UTCMay 21, 19:25 UTC6h 50m
2026-05-21 JBU1080 EDI → BOS May 21, 12:32 UTCMay 22, 10:45 UTC22h 14m
2026-05-21 JBU73 JFK → BNA May 21, 03:55 UTCMay 21, 09:50 UTC5h 55m
2026-05-20 JBU72 SLC → JFK May 20, 12:10 UTCMay 20, 12:45 UTC35m
2026-05-20 JBU72 SLC → JFK May 20, 12:11 UTCMay 21, 09:50 UTC21h 40m
2026-05-20 JBU72 SLC → JFK May 20, 12:11 UTCMay 21, 09:50 UTC21h 40m
2026-05-20 JBU1079 JFK → MBJ May 20, 03:10 UTCMay 20, 09:10 UTC6h 1m
2026-05-19 JBU834 SFO → BOS May 19, 18:45 UTCMay 20, 00:05 UTC5h 20m
2026-05-19 JBU1333 BOS → SFO May 19, 10:45 UTCMay 19, 17:00 UTC6h 15m
2026-05-18 JBU1634 JFK → BTV May 18, 22:40 UTCMay 19, 04:20 UTC5h 40m
2026-05-18 JBU115 JFK → MSY May 18, 14:45 UTCMay 18, 21:00 UTC6h 14m
2026-05-18 JBU616 SFO → JFK May 18, 05:55 UTCMay 18, 11:05 UTC5h 10m
2026-05-17 JBU1633 BTV → JFK May 17, 19:40 UTCMay 18, 02:05 UTC6h 25m
2026-05-17 JBU353 JFK → BUR May 17, 01:13 UTCMay 18, 00:45 UTC23h 33m
2026-05-16 JBU1080 EDI → BOS May 16, 10:40 UTCMay 17, 06:55 UTC20h 16m
2026-05-16 JBU73 JFK → BNA May 16, 01:45 UTCMay 16, 02:45 UTC1h 0m
2026-05-16 JBU73 JFK → BNA May 16, 01:40 UTCMay 17, 00:40 UTC23h 1m
2026-05-15 JBU72 SLC → JFK May 15, 11:20 UTCMay 15, 18:20 UTC6h 59m
2026-05-15 JBU1079 JFK → MBJ May 15, 03:15 UTCMay 15, 08:50 UTC5h 35m
2026-05-14 JBU834 SFO → BOS May 14, 19:20 UTCMay 15, 00:35 UTC5h 15m
2026-05-14 JBU1333 BOS → SFO May 14, 10:40 UTCMay 14, 16:55 UTC6h 15m
2026-05-13 JBU1634 JFK → BTV May 13, 22:45 UTCMay 14, 04:00 UTC5h 15m
2026-05-13 JBU115 JFK → MSY May 13, 14:45 UTCMay 13, 20:30 UTC5h 45m
2026-05-13 JBU616 SFO → JFK May 13, 05:55 UTCMay 13, 11:00 UTC5h 5m
2026-05-12 JBU1633 BTV → JFK May 12, 19:20 UTCMay 13, 01:25 UTC6h 5m
2026-05-12 JBU1634 JFK → BTV May 12, 02:45 UTCMay 12, 03:40 UTC55m
2026-05-11 JBU115 JFK → MSY May 11, 18:20 UTCMay 11, 20:35 UTC2h 15m
2026-05-11 JBU115 JFK → MSY May 11, 14:45 UTCMay 11, 18:15 UTC3h 31m
2026-05-11 JBU616 SFO → JFK May 11, 06:05 UTCMay 11, 11:05 UTC5h 0m
2026-05-10 JBU1633 BTV → JFK May 10, 16:14 UTCMay 10, 22:25 UTC6h 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 N2157J page for operator, model, and routing details .

Mode-S A1CF6B frequently asked

What is Mode-S code A1CF6B?
A1CF6B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2157J.
Where is Mode-S A1CF6B registered?
Mode-S code A1CF6B 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 A1CF6B broadcasting right now?
Yes. Mode-S A1CF6B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1CF6B, octal 50347553, decimal 10,604,395.
What flights does A1CF6B operate?
Mode-S A1CF6B has broadcast 20 distinct callsigns, including JBU115, JBU72, JBU616, JBU334, JBU834.