Apparatus

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sensors Mode-S transponder

A583F5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N45440 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A583F5
Octal
51301765
Decimal
10,847,221
Country
US
Tail
N45440
Type
B739
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
78
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A583F5.

Country allocation

The ICAO 24-bit address A583F5 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
UAL2486 - 4 2026-07-10
UAL2330 - 4 2026-07-15
UAL1340 - 3 2026-07-16
UAL658 United Airlines 2 2026-07-22
UAL402 - 2 2026-07-16
UAL3897 - 2 2026-07-09
UAL2683 - 2 2026-07-10
UAL2419 United Airlines 2 2026-07-23
UAL2314 - 2 2026-07-20
UAL2290 - 2 2026-07-18
UAL1463 - 2 2026-04-13
UAL1441 United Airlines 2 2026-07-20
UAL8237 - 1 2026-07-13
UAL679 - 1 2026-07-19
UAL624 United Airlines 1 2026-07-23
UAL574 United Airlines 1 2026-07-23
UAL486 - 1 2026-07-19
UAL483 United Airlines 1 2026-07-25
UAL455 United Airlines 1 2026-07-22
UAL454 - 1 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1259 SJC → DEN Jul 26, 18:20 UTCJul 26, 21:15 UTC2h 55m
2026-07-26 UAL2322 IAH → CMH Jul 26, 14:50 UTCJul 26, 16:50 UTC2h 0m
2026-07-26 UAL2191 EUG → SFO Jul 26, 02:45 UTCJul 26, 04:55 UTC2h 10m
2026-07-25 UAL1743 IAH → CVG Jul 25, 21:55 UTCJul 26, 00:45 UTC2h 50m
2026-07-25 UAL2498 IAH → EWR Jul 25, 16:30 UTCJul 25, 19:55 UTC3h 25m
2026-07-25 UAL2647 DCA → IAH Jul 25, 13:20 UTCJul 25, 14:15 UTC55m
2026-07-25 UAL483 BNA → SFO Jul 25, 01:25 UTCJul 25, 04:10 UTC2h 45m
2026-07-24 UAL1591 DEN → EWR Jul 24, 20:40 UTCJul 24, 23:40 UTC3h 0m
2026-07-24 UAL2367 PIT → SFO Jul 24, 18:05 UTCJul 24, 19:00 UTC55m
2026-07-23 UAL574 LAS → SFO Jul 23, 22:00 UTCJul 23, 23:05 UTC1h 5m
2026-07-23 UAL2382 IAH → PHL Jul 23, 19:05 UTCJul 23, 20:10 UTC1h 5m
2026-07-23 UAL2744 MCO → EWR Jul 23, 13:40 UTCJul 23, 17:05 UTC3h 25m
2026-07-23 UAL2419 MFR → SFO Jul 23, 05:56 UTCJul 23, 07:42 UTC1h 46m
2026-07-23 UAL2419 MFR → SFO Jul 23, 05:50 UTCJul 23, 07:40 UTC1h 50m
2026-07-23 UAL624 BTV → ORD Jul 23, 02:35 UTCJul 23, 04:05 UTC1h 30m
2026-07-22 UAL455 ORD → MSN Jul 22, 19:05 UTCJul 22, 22:10 UTC3h 5m
2026-07-22 UAL2171 GRR → DEN Jul 22, 13:30 UTCJul 22, 16:55 UTC3h 25m
2026-07-22 UAL658 AUS → EWR Jul 22, 04:05 UTCJul 22, 05:25 UTC1h 20m
2026-07-22 UAL658 AUS → EWR Jul 22, 03:43 UTCJul 22, 07:41 UTC3h 58m
2026-07-21 UAL1196 - Jul 21, 17:20 UTCJul 21, 20:55 UTC3h 35m
2026-07-21 UAL1154 IAD → CUN Jul 21, 12:40 UTCJul 21, 15:30 UTC2h 50m
2026-07-21 UAL2775 IAH → IAD Jul 21, 01:55 UTCJul 21, 04:35 UTC2h 40m
2026-07-20 UAL1468 SAL → IAH Jul 20, 20:15 UTCJul 20, 22:40 UTC2h 25m
2026-07-20 UAL1441 IAH → SAL Jul 20, 16:15 UTCJul 20, 16:40 UTC25m
2026-07-20 UAL1441 IAH → SAL Jul 20, 16:14 UTCJul 20, 18:36 UTC2h 22m
2026-07-20 UAL2314 - Jul 20, 11:55 UTCJul 20, 14:10 UTC2h 15m
2026-07-20 UAL2314 FLL → IAH Jul 20, 11:52 UTCJul 20, 14:00 UTC2h 8m
2026-07-20 UAL1230 YVR → SFO Jul 20, 04:50 UTCJul 20, 10:00 UTC5h 10m
2026-07-20 UAL2681 DEN → SFO Jul 20, 02:05 UTCJul 20, 03:10 UTC1h 5m
2026-07-19 UAL679 - Jul 19, 19:55 UTCJul 20, 00:05 UTC4h 10m
2026-07-19 UAL486 MCO → CLE Jul 19, 15:50 UTCJul 19, 17:50 UTC2h 0m
2026-07-19 UAL2636 - Jul 19, 12:15 UTCJul 19, 14:10 UTC1h 55m
2026-07-19 UAL1502 ORD → CLE Jul 19, 04:05 UTCJul 19, 04:50 UTC45m
2026-07-18 UAL2290 - Jul 18, 22:20 UTCJul 19, 00:30 UTC2h 10m
2026-07-18 UAL2290 EWR → ORD Jul 18, 20:21 UTCJul 19, 00:10 UTC3h 49m
2026-07-18 UAL1574 LAS → SFO Jul 18, 01:50 UTCJul 18, 04:40 UTC2h 51m
2026-07-17 UAL454 EWR → DFW Jul 17, 13:25 UTCJul 17, 16:24 UTC3h 0m
2026-07-17 UAL1652 YVR → EWR Jul 17, 06:50 UTCJul 17, 11:20 UTC4h 30m
2026-07-16 UAL1423 - Jul 16, 21:19 UTCJul 17, 02:45 UTC5h 25m
2026-07-16 UAL1340 - Jul 16, 19:30 UTCJul 16, 19:40 UTC10m
2026-07-16 UAL1340 - Jul 16, 16:15 UTCJul 16, 19:40 UTC3h 25m
2026-07-16 UAL1340 EWR → SFO Jul 16, 16:21 UTCJul 16, 19:13 UTC2h 52m
2026-07-16 UAL2438 - Jul 16, 11:30 UTCJul 16, 14:25 UTC2h 55m
2026-07-16 UAL402 DFW → EWR Jul 16, 00:30 UTCJul 16, 04:00 UTC3h 30m
2026-07-15 UAL2330 - Jul 15, 21:30 UTCJul 15, 22:35 UTC1h 5m
2026-07-15 UAL2330 ICT → DFW Jul 15, 21:41 UTCJul 15, 22:27 UTC46m
2026-07-15 UAL2330 EWR → ICT Jul 15, 17:10 UTCJul 15, 20:35 UTC3h 25m
2026-07-15 UAL1705 ATL → EWR Jul 15, 13:30 UTCJul 15, 15:15 UTC1h 45m
2026-07-15 UAL1012 - Jul 15, 10:35 UTCJul 15, 12:15 UTC1h 40m
2026-07-14 UAL402 DFW → EWR Jul 14, 22:10 UTCJul 15, 01:10 UTC2h 59m

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 N45440 page for operator, model, and routing details .

Mode-S A583F5 frequently asked

What is Mode-S code A583F5?
A583F5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N45440.
Where is Mode-S A583F5 registered?
Mode-S code A583F5 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 A583F5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A583F5, octal 51301765, decimal 10,847,221.
What flights does A583F5 operate?
Mode-S A583F5 has broadcast 20 distinct callsigns, including UAL2486, UAL2330, UAL1340, UAL658, UAL402.