Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A5F581

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N483UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A5F581
Octal
51372601
Decimal
10,876,289
Country
US
Tail
N483UA
Type
A320
Broadcasting now · callsign UAL291 · 36,000 ft
Flights observed
495
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 02:05 UTC

Current position

A5F581 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A5F581 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
UAL561 - 7 2026-07-12
UAL1803 - 6 2026-06-25
UAL1747 - 6 2026-06-29
UAL1515 - 6 2026-06-18
UAL1061 United Airlines 6 2026-07-21
UAL817 United Airlines 5 2026-05-11
UAL718 United Airlines 5 2026-05-12
UAL2847 - 5 2026-07-15
UAL1934 - 5 2026-07-18
UAL609 United Airlines 4 2026-07-23
UAL2481 - 4 2026-07-19
UAL2262 - 4 2026-06-17
UAL1946 United Airlines 4 2026-04-21
UAL1829 - 4 2026-07-15
UAL1823 - 4 2026-06-29
UAL1625 United Airlines 4 2026-07-21
UAL1488 - 4 2026-07-23
UAL1178 United Airlines 4 2026-07-20
UAL1109 - 4 2026-07-16
UAL1084 - 4 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2202 ORD → EWR Jul 26, 00:40 UTCJul 26, 01:55 UTC1h 15m
2026-07-24 UAL1193 IAH → SFO Jul 24, 23:20 UTCJul 25, 00:50 UTC1h 30m
2026-07-24 UAL1941 IAD → EWR Jul 24, 20:25 UTCJul 24, 21:50 UTC1h 25m
2026-07-24 UAL1114 SFO → ORD Jul 24, 15:00 UTCJul 24, 16:55 UTC1h 55m
2026-07-24 UAL1673 CLE → ORD Jul 24, 01:15 UTCJul 24, 03:00 UTC1h 45m
2026-07-23 UAL2738 IAD → EWR Jul 23, 21:48 UTCJul 23, 22:40 UTC52m
2026-07-23 UAL2738 IAD → EWR Jul 23, 21:45 UTCJul 23, 22:50 UTC1h 5m
2026-07-23 UAL2765 HND → SFO Jul 23, 18:25 UTCJul 23, 19:35 UTC1h 10m
2026-07-23 UAL2765 HND → SFO Jul 23, 18:24 UTCJul 23, 19:31 UTC1h 7m
2026-07-23 UAL609 EWR → RDU Jul 23, 15:10 UTCJul 23, 16:10 UTC1h 0m
2026-07-23 UAL1488 - Jul 23, 12:55 UTCJul 23, 13:45 UTC50m
2026-07-23 UAL303 FLL → EWR Jul 23, 00:05 UTCJul 23, 01:05 UTC1h 0m
2026-07-22 UAL303 FLL → EWR Jul 22, 23:57 UTCJul 23, 00:46 UTC49m
2026-07-22 UAL664 - Jul 22, 22:05 UTCJul 22, 23:00 UTC55m
2026-07-22 UAL1107 SAN → SFO Jul 22, 18:05 UTCJul 22, 19:10 UTC1h 5m
2026-07-22 UAL365 ORD → CVG Jul 22, 16:06 UTCJul 22, 16:35 UTC29m
2026-07-22 UAL365 - Jul 22, 15:55 UTCJul 22, 16:35 UTC40m
2026-07-22 UAL1338 LGA → ORD Jul 22, 13:10 UTCJul 22, 14:15 UTC1h 5m
2026-07-22 UAL2426 IAH → BOS Jul 22, 02:05 UTCJul 22, 02:55 UTC50m
2026-07-21 UAL1625 EWR → DEN Jul 21, 22:00 UTCJul 22, 00:20 UTC2h 20m
2026-07-21 UAL1061 SEA → SFO Jul 21, 17:15 UTCJul 21, 19:20 UTC2h 5m
2026-07-21 UAL2774 NRT → SFO Jul 21, 13:55 UTCJul 21, 15:50 UTC1h 55m
2026-07-20 UAL1369 - Jul 20, 23:55 UTCJul 21, 01:15 UTC1h 20m
2026-07-20 UAL1178 SMF → EWR Jul 20, 18:45 UTCJul 20, 21:25 UTC2h 40m
2026-07-20 UAL1972 ORD → SFO Jul 20, 14:15 UTCJul 20, 17:00 UTC2h 45m
2026-07-20 UAL451 YYC → ORD Jul 20, 11:10 UTCJul 20, 12:30 UTC1h 20m
2026-07-19 UAL2264 IAD → BNA Jul 19, 22:05 UTCJul 19, 23:35 UTC1h 30m
2026-07-19 UAL358 SFO → LAS Jul 19, 17:50 UTCJul 19, 20:45 UTC2h 55m
2026-07-19 UAL528 - Jul 19, 14:05 UTCJul 19, 15:55 UTC1h 50m
2026-07-19 UAL1008 - Jul 19, 10:25 UTCJul 19, 12:00 UTC1h 35m
2026-07-19 UAL2481 - Jul 19, 05:35 UTCJul 19, 06:50 UTC1h 15m
2026-07-19 UAL1084 - Jul 19, 03:25 UTCJul 19, 03:30 UTC5m
2026-07-19 UAL1084 - Jul 19, 02:30 UTCJul 19, 03:30 UTC1h 0m
2026-07-19 UAL1084 LAX → CLE Jul 19, 02:31 UTCJul 19, 03:09 UTC38m
2026-07-18 UAL1934 - Jul 18, 22:00 UTCJul 19, 00:30 UTC2h 30m
2026-07-18 UAL691 - Jul 18, 16:35 UTCJul 18, 18:05 UTC1h 30m
2026-07-18 UAL2174 - Jul 18, 13:20 UTCJul 18, 14:50 UTC1h 30m
2026-07-18 UAL1660 ANC → EWR Jul 18, 00:25 UTCJul 18, 04:15 UTC3h 51m
2026-07-17 UAL2164 DEN → SEA Jul 17, 20:15 UTCJul 17, 22:29 UTC2h 15m
2026-07-17 UAL502 - Jul 17, 15:44 UTCJul 17, 17:55 UTC2h 10m
2026-07-17 UAL1366 IAD → DEN Jul 17, 12:48 UTCJul 17, 14:05 UTC1h 17m
2026-07-17 UAL1366 IAD → DEN Jul 17, 12:50 UTCJul 17, 14:10 UTC1h 20m
2026-07-17 UAL1524 ORF → IAD Jul 17, 10:30 UTCJul 17, 11:04 UTC35m
2026-07-17 UAL2677 CLE → DEN Jul 17, 02:59 UTCJul 17, 03:39 UTC40m
2026-07-17 UAL1460 BNA → IAD Jul 17, 00:04 UTCJul 17, 01:25 UTC1h 20m
2026-07-16 UAL1109 DEN → BNA Jul 16, 20:09 UTCJul 16, 22:25 UTC2h 15m
2026-07-16 UAL502 - Jul 16, 15:40 UTCJul 16, 17:49 UTC2h 10m
2026-07-16 UAL1366 IAD → BNA Jul 16, 12:49 UTCJul 16, 14:10 UTC1h 20m
2026-07-16 UAL1524 ORF → IAD Jul 16, 10:20 UTCJul 16, 10:55 UTC35m
2026-07-16 UAL2677 IAD → ORF Jul 16, 02:55 UTCJul 16, 03:25 UTC30m

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 N483UA page for operator, model, and routing details .

Mode-S A5F581 frequently asked

What is Mode-S code A5F581?
A5F581 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N483UA.
Where is Mode-S A5F581 registered?
Mode-S code A5F581 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 A5F581 broadcasting right now?
Yes. Mode-S A5F581 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5F581, octal 51372601, decimal 10,876,289.
What flights does A5F581 operate?
Mode-S A5F581 has broadcast 20 distinct callsigns, including UAL561, UAL1803, UAL1747, UAL1515, UAL1061.