Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A874E1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N644JB · AIRBUS A-320 · operated by JETBLUE AIRWAYS CORP

Hex
A874E1
Octal
52072341
Decimal
11,039,969
Country
US
Tail
N644JB
Type
A320
Broadcasting now · callsign JBU1687 · 33,000 ft
Flights observed
15
Distinct callsigns
7
Country
US
Last broadcast
3h ago

Current position

A874E1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A874E1 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 7 distinct

Callsign Airline Flights Last seen
JBU1833 JetBlue Airways 4 2026-04-18
JBU688 JetBlue Airways 2 2026-04-17
JBU687 JetBlue Airways 2 2026-04-16
JBU488 - 2 2026-04-16
JBU1976 JetBlue Airways 2 2026-04-16
JBU1925 - 2 2026-04-17
JBU252 JetBlue Airways 1 2026-04-18

Recent flights last 15

DateFlightRouteTakeoffLandingDuration
2026-04-18 JBU252 RSW → HPN Apr 18, 10:28 UTCApr 18, 16:20 UTC5h 53m
2026-04-18 JBU1833 BOS → SFO Apr 18, 01:25 UTCApr 18, 01:35 UTC10m
2026-04-17 JBU1833 BOS → SFO Apr 17, 23:25 UTCApr 18, 01:20 UTC1h 55m
2026-04-17 JBU1833 BOS → SFO Apr 17, 22:50 UTCApr 17, 23:20 UTC30m
2026-04-17 JBU1833 BOS → SFO Apr 17, 21:25 UTCApr 17, 21:40 UTC15m
2026-04-17 JBU688 BNA → LGA Apr 17, 19:25 UTCApr 17, 21:20 UTC1h 55m
2026-04-17 JBU688 BNA → LGA Apr 17, 19:10 UTCApr 18, 16:20 UTC21h 11m
2026-04-17 JBU1925 GSO → MCO Apr 17, 15:20 UTCApr 17, 16:30 UTC1h 10m
2026-04-17 JBU1925 PVD → MCO Apr 17, 13:59 UTCApr 18, 13:05 UTC23h 6m
2026-04-16 JBU1976 KIN → FLL Apr 16, 23:20 UTCApr 17, 00:15 UTC55m
2026-04-16 JBU1976 KIN → FLL Apr 16, 21:48 UTCApr 16, 23:10 UTC1h 22m
2026-04-16 JBU687 BOS → LAX Apr 16, 19:15 UTCApr 16, 19:45 UTC30m
2026-04-16 JBU687 BOS → LAX Apr 16, 17:20 UTCApr 16, 19:10 UTC1h 50m
2026-04-16 JBU488 - Apr 16, 15:15 UTCApr 16, 16:05 UTC50m
2026-04-16 JBU488 - Apr 16, 13:44 UTCApr 16, 15:10 UTC1h 25m

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 N644JB page for operator, model, and routing details .

Mode-S A874E1 frequently asked

What is Mode-S code A874E1?
A874E1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N644JB.
Where is Mode-S A874E1 registered?
Mode-S code A874E1 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 A874E1 broadcasting right now?
Yes. Mode-S A874E1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A874E1, octal 52072341, decimal 11,039,969.
What flights does A874E1 operate?
Mode-S A874E1 has broadcast 7 distinct callsigns, including JBU1833, JBU688, JBU687, JBU488, JBU1976.