Apparatus

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sensors Mode-S transponder

A1A0C4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2039J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A1A0C4
Octal
50320304
Decimal
10,592,452
Country
US
Tail
N2039J
Type
A21N
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
249
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S A1A0C4.

Country allocation

The ICAO 24-bit address A1A0C4 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
JBU505 - 12 2026-07-06
JBU528 - 10 2026-07-07
JBU939 JetBlue Airways 8 2026-04-28
JBU1682 - 8 2026-07-09
JBU1255 JetBlue Airways 8 2026-07-26
JBU610 - 7 2026-07-04
JBU509 JetBlue Airways 7 2026-05-15
JBU965 JetBlue Airways 6 2026-05-08
JBU561 JetBlue Airways 6 2026-04-20
JBU1329 JetBlue Airways 6 2026-05-11
JBU938 JetBlue Airways 5 2026-04-16
JBU887 - 5 2026-07-16
JBU1383 JetBlue Airways 5 2026-05-10
JBU466 - 4 2026-07-11
JBU361 - 4 2026-07-17
JBU2709 JetBlue Airways 4 2026-05-07
JBU1533 JetBlue Airways 4 2026-06-10
JBU966 JetBlue Airways 3 2026-05-18
JBU788 JetBlue Airways 3 2026-07-24
JBU710 JetBlue Airways 3 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JBU1255 FLL → GYE Jul 26, 16:50 UTCJul 26, 19:00 UTC2h 10m
2026-07-26 JBU1255 FLL → GYE Jul 26, 16:47 UTCJul 26, 19:50 UTC3h 4m
2026-07-25 JBU60 RSW → LGA Jul 25, 04:23 UTCJul 25, 22:35 UTC18h 12m
2026-07-24 JBU1759 JFK → KIN Jul 24, 22:25 UTCJul 25, 07:45 UTC9h 20m
2026-07-24 JBU788 SXM → JFK Jul 24, 15:50 UTCJul 24, 19:20 UTC3h 30m
2026-07-24 JBU18 FLL → JAX Jul 24, 00:20 UTCJul 24, 04:50 UTC4h 30m
2026-07-24 JBU18 FLL → JAX Jul 24, 00:08 UTCJul 24, 19:20 UTC19h 12m
2026-07-23 JBU937 ORD → LGB Jul 23, 03:20 UTCJul 23, 04:25 UTC1h 5m
2026-07-23 JBU937 ORD → LGB Jul 23, 03:20 UTCJul 24, 01:40 UTC22h 20m
2026-07-22 JBU2018 MIA → BOS Jul 22, 19:30 UTCJul 23, 00:10 UTC4h 40m
2026-07-21 JBU117 BOS → ATL Jul 21, 16:15 UTCJul 21, 20:15 UTC4h 0m
2026-07-20 JBU1528 POP → JFK Jul 20, 17:07 UTCJul 21, 16:55 UTC23h 48m
2026-07-19 JBU1528 POP → JFK Jul 19, 21:10 UTCJul 20, 20:35 UTC23h 25m
2026-07-19 JBU709 JFK → SDQ Jul 19, 07:12 UTCJul 19, 21:50 UTC14h 39m
2026-07-18 JBU268 PUJ → JFK Jul 18, 15:51 UTCJul 19, 15:00 UTC23h 10m
2026-07-18 JBU869 JFK → DEN Jul 18, 10:30 UTCJul 19, 09:00 UTC22h 31m
2026-07-17 JBU662 - Jul 17, 19:20 UTCJul 17, 19:45 UTC25m
2026-07-17 JBU662 - Jul 17, 18:29 UTCJul 17, 18:40 UTC10m
2026-07-17 JBU662 BGI → JFK Jul 17, 18:24 UTCJul 18, 11:10 UTC16h 47m
2026-07-17 JBU361 - Jul 17, 16:34 UTCJul 17, 16:55 UTC20m
2026-07-17 JBU361 - Jul 17, 12:35 UTCJul 17, 15:44 UTC3h 10m
2026-07-16 JBU1188 SXM → JFK Jul 16, 19:17 UTCJul 17, 18:40 UTC23h 23m
2026-07-16 JBU887 JFK → SXM Jul 16, 13:46 UTCJul 17, 13:00 UTC23h 14m
2026-07-16 JBU1966 GEO → JFK Jul 16, 06:12 UTCJul 16, 23:20 UTC17h 8m
2026-07-15 JBU1965 JFK → GEO Jul 15, 23:56 UTCJul 16, 22:59 UTC23h 4m
2026-07-15 JBU788 - Jul 15, 15:50 UTCJul 15, 19:25 UTC3h 35m
2026-07-15 JBU788 SXM → JFK Jul 15, 15:38 UTCJul 16, 14:20 UTC22h 42m
2026-07-15 JBU787 - Jul 15, 10:20 UTCJul 15, 13:35 UTC3h 15m
2026-07-14 JBU1770 GYE → JFK Jul 14, 12:12 UTCJul 15, 11:00 UTC22h 48m
2026-07-14 JBU1769 JFK → JFK Jul 14, 03:25 UTCJul 14, 18:20 UTC14h 55m
2026-07-13 JBU887 JFK → SXM Jul 13, 14:00 UTCJul 14, 07:10 UTC17h 11m
2026-07-13 JBU310 SDQ → JFK Jul 13, 08:16 UTCJul 14, 07:00 UTC22h 45m
2026-07-13 JBU709 JFK → SDQ Jul 13, 01:56 UTCJul 13, 22:45 UTC20h 50m
2026-07-12 JBU361 JFK → BGI Jul 12, 12:21 UTCJul 13, 11:00 UTC22h 40m
2026-07-11 JBU466 GEO → JFK Jul 11, 22:07 UTCJul 12, 19:40 UTC21h 34m
2026-07-11 JBU466 JFK → JFK Jul 11, 15:20 UTCJul 12, 03:20 UTC12h 0m
2026-07-10 JBU280 MBJ → JFK Jul 10, 19:35 UTCJul 11, 18:45 UTC23h 11m
2026-07-10 JBU279 JFK → JFK Jul 10, 14:25 UTCJul 10, 23:00 UTC8h 36m
2026-07-09 JBU1682 - Jul 9, 18:45 UTCJul 9, 22:35 UTC3h 50m
2026-07-09 JBU1682 - Jul 9, 18:00 UTCJul 9, 18:10 UTC10m
2026-07-09 JBU1682 UVF → JFK Jul 9, 17:55 UTCJul 10, 16:50 UTC22h 55m
2026-07-09 JBU1681 - Jul 9, 12:15 UTCJul 9, 15:45 UTC3h 30m
2026-07-08 JBU1691 JFK → LIR Jul 8, 13:16 UTCJul 9, 13:00 UTC23h 45m
2026-07-07 JBU528 GYE → JFK Jul 7, 22:40 UTCJul 8, 21:00 UTC22h 21m
2026-07-07 JBU528 GYE → JFK Jul 7, 22:40 UTCJul 8, 21:00 UTC22h 21m
2026-07-07 JBU1255 - Jul 7, 15:45 UTCJul 7, 17:35 UTC1h 50m
2026-07-06 JBU505 JFK → FLL Jul 6, 09:55 UTCJul 6, 21:50 UTC11h 55m
2026-07-05 JBU465 JFK → JFK Jul 5, 16:45 UTCJul 6, 05:00 UTC12h 15m
2026-07-04 JBU1668 PUJ → JFK Jul 4, 21:55 UTCJul 5, 17:25 UTC19h 31m
2026-07-04 JBU1669 JFK → PUJ Jul 4, 16:50 UTCJul 5, 13:50 UTC21h 1m

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 N2039J page for operator, model, and routing details .

Mode-S A1A0C4 frequently asked

What is Mode-S code A1A0C4?
A1A0C4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2039J.
Where is Mode-S A1A0C4 registered?
Mode-S code A1A0C4 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 A1A0C4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A0C4, octal 50320304, decimal 10,592,452.
What flights does A1A0C4 operate?
Mode-S A1A0C4 has broadcast 20 distinct callsigns, including JBU505, JBU528, JBU939, JBU1682, JBU1255.