Apparatus

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sensors Mode-S transponder

A5CF41

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N47345 · operated by UNITED AIRLINES INC

Hex
A5CF41
Octal
51347501
Decimal
10,866,497
Country
US
Tail
N47345
Type
B38M
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
446
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S A5CF41.

Country allocation

The ICAO 24-bit address A5CF41 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
UAL231 - 8 2026-06-18
UAL1230 United Airlines 7 2026-04-26
UAL1041 United Airlines 6 2026-04-26
UAL643 United Airlines 5 2026-04-19
UAL324 United Airlines 4 2026-05-07
UAL2661 United Airlines 4 2026-04-16
UAL2623 - 4 2026-07-15
UAL1903 United Airlines 4 2026-05-20
UAL1751 United Airlines 4 2026-05-20
UAL1632 - 4 2026-07-11
UAL1567 United Airlines 4 2026-05-07
UAL1566 United Airlines 4 2026-05-07
UAL745 United Airlines 3 2026-04-13
UAL573 - 3 2026-07-13
UAL523 - 3 2026-06-17
UAL522 - 3 2026-06-17
UAL488 United Airlines 3 2026-06-01
UAL390 United Airlines 3 2026-05-02
UAL368 - 3 2026-07-14
UAL2854 - 3 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2612 EWR → PHX Jul 26, 17:30 UTCJul 26, 19:50 UTC2h 20m
2026-07-26 UAL2772 MSY → IAH Jul 26, 13:10 UTCJul 26, 15:35 UTC2h 25m
2026-07-24 UAL554 EWR → DFW Jul 24, 23:10 UTCJul 25, 00:15 UTC1h 5m
2026-07-24 UAL2172 IAH → PHL Jul 24, 20:39 UTCJul 24, 21:34 UTC55m
2026-07-24 UAL2172 IAH → PHL Jul 24, 20:30 UTCJul 24, 21:40 UTC1h 10m
2026-07-24 UAL1079 SJO → EWR Jul 24, 15:15 UTCJul 24, 18:00 UTC2h 45m
2026-07-24 UAL1079 SJO → EWR Jul 24, 13:25 UTCJul 24, 13:35 UTC10m
2026-07-23 UAL1222 EWR → SJO Jul 23, 21:50 UTCJul 24, 02:30 UTC4h 40m
2026-07-23 UAL221 SFO → MCO Jul 23, 08:15 UTCJul 23, 14:15 UTC6h 0m
2026-07-23 UAL221 SFO → MCO Jul 23, 08:19 UTCJul 23, 15:08 UTC6h 49m
2026-07-23 UAL221 SFO → MCO Jul 23, 08:19 UTCJul 23, 15:07 UTC6h 48m
2026-07-22 UAL222 IAD → SFO Jul 22, 23:43 UTCJul 23, 06:00 UTC6h 17m
2026-07-22 UAL222 IAD → SFO Jul 22, 23:50 UTCJul 23, 06:15 UTC6h 25m
2026-07-22 UAL1985 EWR → EWR Jul 22, 14:45 UTCJul 22, 20:00 UTC5h 15m
2026-07-22 UAL798 DEN → RNO Jul 22, 11:30 UTCJul 22, 12:45 UTC1h 15m
2026-07-22 UAL2104 DCA → DEN Jul 22, 03:55 UTCJul 22, 05:10 UTC1h 15m
2026-07-21 UAL2392 - Jul 21, 19:20 UTCJul 21, 20:30 UTC1h 10m
2026-07-21 UAL2392 BDA → EWR Jul 21, 18:07 UTCJul 21, 20:28 UTC2h 21m
2026-07-21 UAL1985 EWR → BDA Jul 21, 14:43 UTCJul 21, 16:38 UTC1h 55m
2026-07-21 UAL1985 - Jul 21, 14:55 UTCJul 21, 15:35 UTC40m
2026-07-21 UAL2455 EWR → ATL Jul 21, 10:10 UTCJul 21, 12:40 UTC2h 30m
2026-07-20 UAL1845 EWR → RSW Jul 20, 23:40 UTCJul 21, 02:00 UTC2h 20m
2026-07-20 UAL1539 NAS → EWR Jul 20, 16:51 UTCJul 20, 19:12 UTC2h 21m
2026-07-20 UAL1456 EWR → NAS Jul 20, 12:50 UTCJul 20, 19:15 UTC6h 25m
2026-07-20 UAL559 EWR → CLE Jul 20, 04:35 UTCJul 20, 09:35 UTC5h 0m
2026-07-19 UAL205 - Jul 19, 19:45 UTCJul 20, 00:10 UTC4h 25m
2026-07-19 UAL2617 SFO → LAX Jul 19, 15:05 UTCJul 19, 18:05 UTC3h 0m
2026-07-19 UAL3039 IAD → LGA Jul 19, 12:30 UTCJul 19, 13:10 UTC40m
2026-07-18 UAL1595 BZE → EWR Jul 18, 21:55 UTCJul 19, 01:55 UTC4h 0m
2026-07-18 UAL1595 BZE → EWR Jul 18, 21:21 UTCJul 19, 01:51 UTC4h 30m
2026-07-18 UAL2134 DEN → BZE Jul 18, 16:31 UTCJul 18, 20:14 UTC3h 43m
2026-07-18 UAL2134 DEN → BZE Jul 18, 16:30 UTCJul 18, 22:15 UTC5h 45m
2026-07-18 UAL494 FAI → DEN Jul 18, 09:00 UTCJul 18, 13:55 UTC4h 55m
2026-07-18 UAL250 - Jul 18, 01:45 UTCJul 18, 06:30 UTC4h 46m
2026-07-17 UAL287 - Jul 17, 20:10 UTCJul 17, 23:55 UTC3h 45m
2026-07-17 UAL2804 - Jul 17, 17:30 UTCJul 17, 18:55 UTC1h 25m
2026-07-17 UAL2804 - Jul 17, 17:05 UTCJul 17, 17:25 UTC20m
2026-07-17 UAL2749 BWI → ORD Jul 17, 12:19 UTCJul 17, 13:55 UTC1h 35m
2026-07-17 UAL1340 SFO → BWI Jul 17, 06:05 UTCJul 17, 11:10 UTC5h 5m
2026-07-16 UAL2111 HHI → SFO Jul 16, 23:35 UTCJul 17, 04:10 UTC4h 35m
2026-07-16 UAL2111 LIH → SFO Jul 16, 23:28 UTCJul 17, 04:08 UTC4h 40m
2026-07-16 UAL1384 - Jul 16, 16:35 UTCJul 16, 21:35 UTC5h 0m
2026-07-16 UAL1125 - Jul 16, 12:30 UTCJul 16, 13:25 UTC55m
2026-07-16 UAL1125 OGG → SFO Jul 16, 09:05 UTCJul 16, 13:21 UTC4h 16m
2026-07-15 UAL2623 - Jul 15, 21:40 UTCJul 15, 22:10 UTC30m
2026-07-15 UAL267 PHL → SFO Jul 15, 13:40 UTCJul 15, 18:45 UTC5h 5m
2026-07-15 UAL2854 SFO → PHL Jul 15, 06:40 UTCJul 15, 11:40 UTC5h 0m
2026-07-14 UAL368 DCA → SFO Jul 14, 22:35 UTCJul 15, 03:20 UTC4h 44m
2026-07-14 UAL1678 SFO → DCA Jul 14, 15:50 UTCJul 14, 20:55 UTC5h 5m
2026-07-14 UAL1299 - Jul 14, 00:40 UTCJul 14, 05:30 UTC4h 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 N47345 page for operator, model, and routing details .

Mode-S A5CF41 frequently asked

What is Mode-S code A5CF41?
A5CF41 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N47345.
Where is Mode-S A5CF41 registered?
Mode-S code A5CF41 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 A5CF41 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5CF41, octal 51347501, decimal 10,866,497.
What flights does A5CF41 operate?
Mode-S A5CF41 has broadcast 20 distinct callsigns, including UAL231, UAL1230, UAL1041, UAL643, UAL324.