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 JBU1355 · 10,250 ft
Flights observed
329
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

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
JBU1231 JetBlue Airways 4 2026-07-22
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
JBU207 JetBlue Airways 3 2026-07-25
JBU2064 JetBlue Airways 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JBU1515 JFK → SFO Jul 26, 10:45 UTCJul 26, 11:30 UTC45m
2026-07-26 JBU1515 JFK → SFO Jul 26, 10:40 UTCJul 26, 20:10 UTC9h 31m
2026-07-26 JBU845 BOS → SYR Jul 26, 01:45 UTCJul 26, 02:35 UTC50m
2026-07-25 JBU1782 VPS → BOS Jul 25, 21:55 UTCJul 26, 00:25 UTC2h 30m
2026-07-25 JBU1781 BOS → MCO Jul 25, 17:20 UTCJul 25, 20:05 UTC2h 45m
2026-07-25 JBU2116 SFO → JFK Jul 25, 14:45 UTCJul 25, 15:45 UTC1h 0m
2026-07-25 JBU2115 JFK → SFO Jul 25, 12:15 UTCJul 25, 13:20 UTC1h 5m
2026-07-25 JBU207 BOS → BNA Jul 25, 09:55 UTCJul 25, 10:50 UTC55m
2026-07-25 JBU206 BNA → BOS Jul 25, 03:10 UTCJul 25, 04:00 UTC50m
2026-07-25 JBU2754 DCA → BOS Jul 25, 00:55 UTCJul 25, 02:05 UTC1h 10m
2026-07-24 JBU1413 MVY → DCA Jul 24, 22:30 UTCJul 24, 23:45 UTC1h 15m
2026-07-24 JBU2122 PBI → BOS Jul 24, 02:44 UTCJul 25, 01:30 UTC22h 46m
2026-07-23 JBU2494 DCA → ACK Jul 23, 20:25 UTCJul 24, 18:55 UTC22h 30m
2026-07-23 JBU2494 DCA → ACK Jul 23, 20:25 UTCJul 23, 21:25 UTC1h 0m
2026-07-23 JBU855 JFK → PLS Jul 23, 17:30 UTCJul 23, 18:50 UTC1h 20m
2026-07-23 JBU1786 PIT → BOS Jul 23, 12:10 UTCJul 23, 13:20 UTC1h 10m
2026-07-23 JBU1785 BOS → PIT Jul 23, 01:10 UTCJul 23, 02:30 UTC1h 20m
2026-07-22 JBU1232 LGA → BOS Jul 22, 17:50 UTCJul 22, 21:00 UTC3h 10m
2026-07-22 JBU1231 BOS → LGA Jul 22, 13:40 UTCJul 22, 16:35 UTC2h 55m
2026-07-22 JBU772 CUN → BOS Jul 22, 11:30 UTCJul 22, 11:40 UTC10m
2026-07-22 JBU772 CUN → BOS Jul 22, 01:25 UTCJul 22, 05:10 UTC3h 45m
2026-07-21 JBU771 BOS → CUN Jul 21, 19:40 UTCJul 22, 00:00 UTC4h 20m
2026-07-21 JBU2459 BOS → PHL Jul 21, 02:35 UTCJul 22, 01:30 UTC22h 55m
2026-07-20 JBU1736 STI → JFK Jul 20, 18:18 UTCJul 21, 16:00 UTC21h 42m
2026-07-20 JBU1737 JFK → STI Jul 20, 13:08 UTCJul 21, 11:30 UTC22h 22m
2026-07-20 JBU136 PHX → JFK Jul 20, 06:45 UTCJul 20, 07:30 UTC45m
2026-07-20 JBU135 JFK → PHX Jul 20, 01:02 UTCJul 20, 22:10 UTC21h 9m
2026-07-20 JBU135 JFK → PHX Jul 20, 01:05 UTCJul 20, 05:30 UTC4h 25m
2026-07-18 JBU59 JFK → MCO Jul 18, 09:30 UTCJul 18, 19:45 UTC10h 16m
2026-07-18 JBU884 MCO → JFK Jul 18, 01:37 UTCJul 18, 19:45 UTC18h 9m
2026-07-17 JBU605 MCO → SDQ Jul 17, 09:14 UTCJul 18, 03:55 UTC18h 42m
2026-07-16 JBU229 BQN → MCO Jul 16, 22:27 UTCJul 17, 19:05 UTC20h 38m
2026-07-16 JBU2133 MCO → SJU Jul 16, 10:26 UTCJul 17, 09:30 UTC23h 4m
2026-07-16 00000000 - Jul 16, 10:29 UTCJul 16, 11:05 UTC35m
2026-07-15 JBU522 MCO → MCO Jul 15, 17:25 UTCJul 15, 22:15 UTC4h 50m
2026-07-14 JBU1727 EWR → MCO Jul 14, 23:09 UTCJul 15, 21:30 UTC22h 21m
2026-07-14 JBU128 MCO → EWR Jul 14, 19:25 UTCJul 15, 17:30 UTC22h 5m
2026-07-14 JBU2024 MCO → DCA Jul 14, 12:51 UTCJul 15, 11:10 UTC22h 19m
2026-07-14 JBU2876 PVD → MCO Jul 14, 00:57 UTCJul 14, 23:30 UTC22h 33m
2026-07-13 JBU2875 MCO → PVD Jul 13, 21:39 UTCJul 14, 21:30 UTC23h 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

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.