Apparatus

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sensors Mode-S transponder

A5CF3F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N47343 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A5CF3F
Octal
51347477
Decimal
10,866,495
Country
US
Tail
N47343
Type
B38M
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
411
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A5CF3F.

Country allocation

The ICAO 24-bit address A5CF3F 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
UAL518 - 6 2026-06-26
UAL2021 - 6 2026-07-11
UAL1975 - 5 2026-07-19
UAL1567 - 5 2026-07-10
UAL1368 - 5 2026-07-11
UAL527 - 4 2026-06-26
UAL2426 United Airlines 4 2026-07-21
UAL209 United Airlines 4 2026-04-24
UAL2036 United Airlines 4 2026-07-26
UAL1870 - 4 2026-07-01
UAL1789 - 4 2026-06-22
UAL1523 - 4 2026-07-10
UAL1366 United Airlines 4 2026-04-29
UAL1339 United Airlines 4 2026-07-26
UAL1065 - 4 2026-06-27
UAL1008 United Airlines 4 2026-05-09
UAL841 - 3 2026-07-17
UAL784 United Airlines 3 2026-06-18
UAL776 - 3 2026-07-03
UAL269 United Airlines 3 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2858 EWR → MSY Jul 26, 21:00 UTCJul 26, 21:45 UTC45m
2026-07-26 UAL2454 ORD → LGA Jul 26, 15:50 UTCJul 26, 19:05 UTC3h 15m
2026-07-26 UAL1712 LAX → SFO Jul 26, 11:00 UTCJul 26, 13:50 UTC2h 50m
2026-07-26 UAL2036 SJU → EWR Jul 26, 06:35 UTCJul 26, 07:35 UTC1h 0m
2026-07-26 UAL2036 SJU → EWR Jul 26, 04:10 UTCJul 26, 04:25 UTC15m
2026-07-26 UAL1339 LAX → DEN Jul 26, 02:45 UTCJul 26, 02:55 UTC10m
2026-07-25 UAL1339 LAX → DEN Jul 25, 21:30 UTCJul 26, 01:05 UTC3h 35m
2026-07-25 UAL1584 - Jul 25, 13:35 UTCJul 25, 14:00 UTC25m
2026-07-25 UAL2859 ORD → CVG Jul 25, 02:05 UTCJul 25, 02:20 UTC15m
2026-07-24 UAL1698 SFO → SLC Jul 24, 19:25 UTCJul 25, 00:10 UTC4h 45m
2026-07-24 UAL1514 EWR → PUJ Jul 24, 12:35 UTCJul 24, 16:02 UTC3h 27m
2026-07-24 UAL1514 - Jul 24, 12:35 UTCJul 24, 13:50 UTC1h 15m
2026-07-24 UAL2036 SJU → EWR Jul 24, 01:45 UTCJul 24, 02:40 UTC55m
2026-07-23 UAL2036 SJU → EWR Jul 23, 23:15 UTCJul 23, 23:30 UTC15m
2026-07-23 UAL1339 LAX → DEN Jul 23, 21:45 UTCJul 23, 22:00 UTC15m
2026-07-23 UAL1339 LAX → DEN Jul 23, 16:35 UTCJul 23, 20:05 UTC3h 30m
2026-07-23 UAL1584 - Jul 23, 13:40 UTCJul 23, 14:00 UTC20m
2026-07-23 UAL2859 ORD → CVG Jul 23, 02:05 UTCJul 23, 02:20 UTC15m
2026-07-22 UAL287 EWR → BOS Jul 22, 20:00 UTCJul 23, 00:10 UTC4h 10m
2026-07-22 UAL2804 - Jul 22, 16:25 UTCJul 22, 18:20 UTC1h 55m
2026-07-21 UAL2426 IAH → BOS Jul 21, 17:55 UTCJul 21, 21:40 UTC3h 45m
2026-07-21 UAL2423 - Jul 21, 11:15 UTCJul 21, 16:15 UTC5h 0m
2026-07-20 UAL1538 - Jul 20, 14:15 UTCJul 20, 23:35 UTC9h 20m
2026-07-20 UAL1753 - Jul 20, 11:20 UTCJul 20, 12:20 UTC1h 0m
2026-07-19 UAL1975 EWR → RDU Jul 19, 21:50 UTCJul 19, 23:20 UTC1h 30m
2026-07-19 UAL1975 LAS → EWR Jul 19, 21:37 UTCJul 19, 23:16 UTC1h 39m
2026-07-19 UAL606 MCO → EWR Jul 19, 17:54 UTCJul 19, 19:48 UTC1h 54m
2026-07-19 UAL606 MCO → EWR Jul 19, 17:45 UTCJul 19, 20:00 UTC2h 15m
2026-07-18 UAL1579 MSY → SFO Jul 18, 22:10 UTCJul 19, 01:05 UTC2h 55m
2026-07-18 UAL1413 ANC → DEN Jul 18, 13:35 UTCJul 18, 18:20 UTC4h 45m
2026-07-17 UAL841 ORD → ANC Jul 17, 23:10 UTCJul 18, 05:15 UTC6h 6m
2026-07-17 UAL1382 PHX → EWR Jul 17, 20:04 UTCJul 17, 21:05 UTC1h 0m
2026-07-17 UAL1355 ORD → STL Jul 17, 16:10 UTCJul 17, 16:59 UTC50m
2026-07-17 UAL1061 DCA → ORD Jul 17, 12:40 UTCJul 17, 14:15 UTC1h 35m
2026-07-17 UAL1627 - Jul 17, 00:35 UTCJul 17, 03:20 UTC2h 45m
2026-07-16 UAL1903 - Jul 16, 20:35 UTCJul 16, 21:10 UTC35m
2026-07-16 UAL1903 - Jul 16, 18:44 UTCJul 16, 18:50 UTC5m
2026-07-16 UAL1751 - Jul 16, 17:05 UTCJul 16, 17:20 UTC15m
2026-07-16 UAL1751 - Jul 16, 15:05 UTCJul 16, 15:35 UTC30m
2026-07-16 UAL1751 IAH → GUA Jul 16, 14:50 UTCJul 16, 17:19 UTC2h 29m
2026-07-16 UAL2083 - Jul 16, 00:45 UTCJul 16, 11:30 UTC10h 45m
2026-07-15 UAL1433 - Jul 15, 20:20 UTCJul 15, 22:50 UTC2h 30m
2026-07-15 UAL1433 MGA → IAH Jul 15, 19:48 UTCJul 15, 22:45 UTC2h 57m
2026-07-15 UAL1432 - Jul 15, 15:40 UTCJul 15, 17:45 UTC2h 5m
2026-07-15 UAL1432 IAH → MGA Jul 15, 15:06 UTCJul 15, 18:23 UTC3h 17m
2026-07-15 UAL2393 - Jul 15, 12:45 UTCJul 15, 13:25 UTC40m
2026-07-15 UAL1942 DEN → AUS Jul 15, 01:10 UTCJul 15, 02:50 UTC1h 40m
2026-07-14 UAL1918 - Jul 14, 19:00 UTCJul 14, 23:10 UTC4h 9m
2026-07-14 UAL1876 - Jul 14, 16:20 UTCJul 14, 16:40 UTC20m
2026-07-14 UAL1876 - Jul 14, 11:50 UTCJul 14, 15:40 UTC3h 50m

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 N47343 page for operator, model, and routing details .

Mode-S A5CF3F frequently asked

What is Mode-S code A5CF3F?
A5CF3F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N47343.
Where is Mode-S A5CF3F registered?
Mode-S code A5CF3F 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 A5CF3F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5CF3F, octal 51347477, decimal 10,866,495.
What flights does A5CF3F operate?
Mode-S A5CF3F has broadcast 20 distinct callsigns, including UAL518, UAL2021, UAL1975, UAL1567, UAL1368.