Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A5CF19

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N47330 · BOEING 737 MAX 8 · operated by UNITED AIRLINES INC

Hex
A5CF19
Octal
51347431
Decimal
10,866,457
Country
US
Tail
N47330
Type
B38M
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
417
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A5CF19.

Country allocation

The ICAO 24-bit address A5CF19 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
UAL1271 United Airlines 7 2026-06-11
UAL2021 - 6 2026-07-03
UAL1751 United Airlines 5 2026-05-10
UAL1539 United Airlines 5 2026-06-07
UAL1272 - 5 2026-06-12
UAL643 - 4 2026-06-19
UAL508 United Airlines 4 2026-06-29
UAL437 United Airlines 4 2026-07-21
UAL280 United Airlines 4 2026-07-26
UAL2092 - 4 2026-07-20
UAL1903 United Airlines 4 2026-05-10
UAL1589 United Airlines 4 2026-07-24
UAL1368 - 4 2026-07-03
UAL8100 - 3 2026-07-07
UAL572 - 3 2026-07-12
UAL436 United Airlines 3 2026-04-24
UAL417 - 3 2026-06-16
UAL2672 United Airlines 3 2026-04-24
UAL2382 - 3 2026-07-01
UAL2285 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL280 DEN → ANC Jul 26, 17:45 UTCJul 26, 22:15 UTC4h 30m
2026-07-26 UAL280 DEN → ANC Jul 26, 14:40 UTCJul 26, 16:00 UTC1h 20m
2026-07-26 UAL1027 EWR → IAH Jul 26, 02:00 UTCJul 26, 03:30 UTC1h 30m
2026-07-25 UAL1099 SJO → IAH Jul 25, 19:40 UTCJul 25, 22:50 UTC3h 10m
2026-07-25 UAL1096 IAH → SJO Jul 25, 14:55 UTCJul 25, 18:10 UTC3h 15m
2026-07-25 UAL1450 EWR → PBI Jul 25, 10:15 UTCJul 25, 12:45 UTC2h 30m
2026-07-25 UAL1627 LAX → EWR Jul 25, 00:15 UTCJul 25, 02:55 UTC2h 40m
2026-07-24 UAL1589 IAH → LGA Jul 24, 17:40 UTCJul 24, 20:50 UTC3h 10m
2026-07-24 UAL1589 IAH → LGA Jul 24, 17:29 UTCJul 24, 20:50 UTC3h 21m
2026-07-24 UAL2448 PHX → SFO Jul 24, 12:55 UTCJul 24, 16:10 UTC3h 15m
2026-07-24 UAL2083 UIO → IAH Jul 24, 00:45 UTCJul 24, 11:15 UTC10h 30m
2026-07-23 UAL1432 IAH → MGA Jul 23, 15:10 UTCJul 23, 22:30 UTC7h 20m
2026-07-23 UAL2302 - Jul 23, 10:30 UTCJul 23, 13:15 UTC2h 45m
2026-07-23 UAL2302 ORF → IAH Jul 23, 10:33 UTCJul 23, 13:15 UTC2h 42m
2026-07-22 UAL2439 TPA → ORD Jul 22, 23:45 UTCJul 23, 02:25 UTC2h 40m
2026-07-22 UAL1589 IAH → LGA Jul 22, 17:25 UTCJul 22, 20:35 UTC3h 10m
2026-07-22 UAL1589 IAH → LGA Jul 22, 17:29 UTCJul 22, 20:31 UTC3h 2m
2026-07-22 UAL2448 PHX → SFO Jul 22, 12:50 UTCJul 22, 16:00 UTC3h 10m
2026-07-22 UAL438 BOI → SFO Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-21 UAL437 DEN → SJC Jul 21, 21:50 UTCJul 22, 03:25 UTC5h 35m
2026-07-21 UAL437 DEN → SJC Jul 21, 21:56 UTCJul 22, 03:41 UTC5h 45m
2026-07-21 UAL1676 EWR → SAN Jul 21, 18:35 UTCJul 21, 19:05 UTC30m
2026-07-21 UAL1676 EWR → SAN Jul 21, 16:10 UTCJul 21, 17:45 UTC1h 35m
2026-07-21 UAL1675 DEN → PHL Jul 21, 01:45 UTCJul 21, 01:55 UTC10m
2026-07-20 UAL1675 DEN → PHL Jul 20, 21:55 UTCJul 21, 00:50 UTC2h 55m
2026-07-20 UAL692 LGA → IAH Jul 20, 16:50 UTCJul 20, 19:44 UTC2h 54m
2026-07-20 UAL692 - Jul 20, 16:50 UTCJul 20, 19:50 UTC3h 0m
2026-07-20 UAL2092 - Jul 20, 15:05 UTCJul 20, 15:10 UTC5m
2026-07-20 UAL2092 ORD → LGA Jul 20, 13:30 UTCJul 20, 14:49 UTC1h 19m
2026-07-20 UAL2092 ORD → LGA Jul 20, 13:15 UTCJul 20, 15:10 UTC1h 55m
2026-07-19 UAL474 - Jul 19, 20:35 UTCJul 20, 00:05 UTC3h 30m
2026-07-19 UAL359 ORD → MEX Jul 19, 14:45 UTCJul 19, 18:10 UTC3h 25m
2026-07-17 UAL2766 SMF → ORD Jul 17, 22:45 UTCJul 18, 02:55 UTC4h 11m
2026-07-17 UAL1415 DEN → SMF Jul 17, 17:52 UTCJul 17, 20:39 UTC2h 47m
2026-07-17 UAL1415 - Jul 17, 18:40 UTCJul 17, 20:15 UTC1h 35m
2026-07-17 UAL690 - Jul 17, 13:10 UTCJul 17, 15:40 UTC2h 30m
2026-07-17 UAL2398 EWR → CLE Jul 17, 00:35 UTCJul 17, 01:39 UTC1h 5m
2026-07-16 UAL348 BZN → EWR Jul 16, 17:48 UTCJul 16, 21:23 UTC3h 35m
2026-07-16 UAL348 EWR → EWR Jul 16, 12:09 UTCJul 16, 21:25 UTC9h 15m
2026-07-16 UAL559 - Jul 16, 07:10 UTCJul 16, 10:00 UTC2h 50m
2026-07-15 UAL205 - Jul 15, 19:55 UTCJul 16, 00:30 UTC4h 35m
2026-07-13 UAL2198 - Jul 13, 23:25 UTCJul 14, 01:45 UTC2h 20m
2026-07-13 UAL1238 - Jul 13, 19:55 UTCJul 13, 22:05 UTC2h 10m
2026-07-13 UAL2421 - Jul 13, 16:10 UTCJul 13, 18:35 UTC2h 25m
2026-07-13 UAL1353 - Jul 13, 12:55 UTCJul 13, 14:40 UTC1h 45m
2026-07-13 UAL2083 - Jul 13, 07:20 UTCJul 13, 10:40 UTC3h 20m
2026-07-12 UAL1002 - Jul 12, 23:50 UTCJul 13, 03:01 UTC3h 10m
2026-07-12 UAL1002 IAH → UIO Jul 12, 23:46 UTCJul 13, 04:28 UTC4h 42m
2026-07-12 UAL2170 - Jul 12, 19:35 UTCJul 12, 22:00 UTC2h 25m
2026-07-12 UAL2170 - Jul 12, 12:55 UTCJul 12, 16:25 UTC3h 30m

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 N47330 page for operator, model, and routing details .

Mode-S A5CF19 frequently asked

What is Mode-S code A5CF19?
A5CF19 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N47330.
Where is Mode-S A5CF19 registered?
Mode-S code A5CF19 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 A5CF19 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5CF19, octal 51347431, decimal 10,866,457.
What flights does A5CF19 operate?
Mode-S A5CF19 has broadcast 20 distinct callsigns, including UAL1271, UAL2021, UAL1751, UAL1539, UAL1272.