Apparatus

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sensors Mode-S transponder

A3871E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N3261J · operated by JETBLUE AIRWAYS CORP

Hex
A3871E
Octal
50703436
Decimal
10,716,958
Country
US
Tail
N3261J
Type
BCS3
Broadcasting now · callsign JBU128 · 24,150 ft
Flights observed
292
Distinct callsigns
20
Country
US
Last broadcast
14m ago

Current position

A3871E is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A3871E 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
JBU502 JetBlue Airways 7 2026-05-04
JBU159 JetBlue Airways 7 2026-05-20
JBU401 - 5 2026-06-17
JBU400 JetBlue Airways 5 2026-06-17
JBU1303 JetBlue Airways 5 2026-05-11
JBU994 JetBlue Airways 4 2026-06-09
JBU822 JetBlue Airways 4 2026-05-02
JBU2033 - 4 2026-07-09
JBU1375 JetBlue Airways 4 2026-05-16
JBU1281 - 4 2026-07-13
JBU741 JetBlue Airways 3 2026-06-22
JBU640 - 3 2026-06-22
JBU501 JetBlue Airways 3 2026-05-26
JBU2602 - 3 2026-06-13
JBU249 JetBlue Airways 3 2026-06-01
JBU2467 JetBlue Airways 3 2026-05-18
JBU2255 JetBlue Airways 3 2026-05-07
JBU2064 JetBlue Airways 3 2026-04-15
JBU201 - 3 2026-07-02
JBU184 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JBU2024 MCO → DCA Jul 14, 12:51 UTCJul 14, 19:30 UTC6h 40m
2026-07-14 JBU2876 PVD → MCO Jul 14, 00:57 UTCJul 14, 19:30 UTC18h 34m
2026-07-13 JBU2875 MCO → PVD Jul 13, 21:39 UTCJul 14, 19:30 UTC21h 52m
2026-07-13 JBU51 BOS → MCO Jul 13, 16:36 UTCJul 14, 14:45 UTC22h 10m
2026-07-13 JBU1281 - Jul 13, 11:10 UTCJul 13, 12:25 UTC1h 15m
2026-07-13 JBU1281 BOS → RIC Jul 13, 11:10 UTCJul 14, 09:30 UTC22h 21m
2026-07-13 JBU1281 BOS → BOS Jul 13, 10:40 UTCJul 13, 10:45 UTC5m
2026-07-13 JBU2066 BOS → BOS Jul 13, 07:45 UTCJul 13, 07:50 UTC5m
2026-07-12 JBU207 PQI → BOS Jul 12, 09:58 UTCJul 13, 09:30 UTC23h 33m
2026-07-12 JBU207 PQI → BOS Jul 12, 10:01 UTCJul 12, 10:55 UTC55m
2026-07-12 JBU206 BOS → PQI Jul 12, 02:05 UTCJul 12, 03:01 UTC55m
2026-07-11 JBU394 - Jul 11, 21:00 UTCJul 12, 00:30 UTC3h 30m
2026-07-11 JBU793 BOS → DEN Jul 11, 15:35 UTCJul 11, 19:30 UTC3h 55m
2026-07-11 JBU1896 ATL → BOS Jul 11, 11:30 UTCJul 11, 13:40 UTC2h 10m
2026-07-10 JBU1413 MVY → DCA Jul 10, 19:22 UTCJul 11, 17:30 UTC22h 9m
2026-07-10 JBU95 BOS → PDX Jul 10, 01:03 UTCJul 10, 23:30 UTC22h 28m
2026-07-09 JBU2033 BOS → IAH Jul 9, 13:33 UTCJul 10, 11:30 UTC21h 57m
2026-07-09 JBU2033 - Jul 9, 13:35 UTCJul 9, 17:05 UTC3h 30m
2026-07-08 JBU2033 - Jul 8, 13:35 UTCJul 8, 17:00 UTC3h 25m
2026-07-08 JBU2033 BOS → IAH Jul 8, 13:32 UTCJul 9, 10:55 UTC21h 24m
2026-07-08 JBU1484 RDU → BOS Jul 8, 10:05 UTCJul 8, 11:30 UTC1h 25m
2026-07-07 JBU1154 - Jul 7, 15:00 UTCJul 7, 17:05 UTC2h 5m
2026-07-07 JBU1154 PBI → JFK Jul 7, 14:56 UTCJul 8, 13:30 UTC22h 35m
2026-07-07 JBU953 - Jul 7, 10:45 UTCJul 7, 13:00 UTC2h 15m
2026-07-06 JBU237 JFK → STI Jul 6, 14:54 UTCJul 7, 13:00 UTC22h 7m
2026-07-05 JBU192 ACK → JFK Jul 5, 21:07 UTCJul 6, 15:40 UTC18h 33m
2026-07-05 JBU1868 - Jul 5, 14:25 UTCJul 5, 16:30 UTC2h 5m
2026-07-05 JBU1868 DAB → JFK Jul 5, 14:22 UTCJul 6, 10:40 UTC20h 18m
2026-07-05 JBU1867 HPN → PBI Jul 5, 11:10 UTCJul 5, 13:15 UTC2h 5m
2026-07-04 JBU184 - Jul 4, 15:25 UTCJul 4, 17:40 UTC2h 15m
2026-07-03 JBU2134 SJU → MCO Jul 3, 20:28 UTCJul 4, 17:45 UTC21h 17m
2026-07-03 JBU1516 JFK → SYR Jul 3, 03:33 UTCJul 4, 01:30 UTC21h 57m
2026-07-03 JBU1516 - Jul 3, 03:35 UTCJul 3, 04:15 UTC40m
2026-07-03 JBU342 - Jul 3, 00:00 UTCJul 3, 01:45 UTC1h 45m
2026-07-02 JBU341 - Jul 2, 20:45 UTCJul 2, 22:25 UTC1h 40m
2026-07-02 JBU201 BUF → JFK Jul 2, 01:00 UTCJul 2, 22:25 UTC21h 25m
2026-07-01 JBU1736 STI → JFK Jul 1, 16:31 UTCJul 2, 15:00 UTC22h 29m
2026-07-01 JBU1736 JFK → JFK Jul 1, 11:50 UTCJul 1, 19:55 UTC8h 5m
2026-07-01 JBU359 BUR → JFK Jul 1, 04:30 UTCJul 1, 09:25 UTC4h 55m
2026-06-30 JBU358 - Jun 30, 21:15 UTCJul 1, 02:45 UTC5h 30m
2026-06-30 JBU80 - Jun 30, 14:45 UTCJun 30, 19:30 UTC4h 45m
2026-06-29 JBU81 - Jun 29, 23:29 UTCJun 30, 04:55 UTC5h 26m
2026-06-29 JBU1716 - Jun 29, 18:44 UTCJun 29, 20:54 UTC2h 10m
2026-06-29 JBU805 JFK → ORD Jun 29, 00:30 UTCJun 29, 23:29 UTC23h 0m
2026-06-29 JBU805 - Jun 29, 00:34 UTCJun 29, 02:35 UTC2h 0m
2026-06-28 JBU1716 - Jun 28, 18:25 UTCJun 28, 20:34 UTC2h 10m
2026-06-27 JBU317 BOS → JFK Jun 27, 22:15 UTCJun 27, 23:00 UTC45m
2026-06-27 JBU317 BOS → JFK Jun 27, 22:14 UTCJun 28, 20:39 UTC22h 26m
2026-06-27 JBU494 - Jun 27, 17:14 UTCJun 27, 20:39 UTC3h 25m
2026-06-27 JBU493 - Jun 27, 11:20 UTCJun 27, 15:24 UTC4h 5m

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 N3261J page for operator, model, and routing details .

Mode-S A3871E frequently asked

What is Mode-S code A3871E?
A3871E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N3261J.
Where is Mode-S A3871E registered?
Mode-S code A3871E 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 A3871E broadcasting right now?
Yes. Mode-S A3871E is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3871E, octal 50703436, decimal 10,716,958.
What flights does A3871E operate?
Mode-S A3871E has broadcast 20 distinct callsigns, including JBU502, JBU159, JBU401, JBU400, JBU1303.