Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A5F938

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N484UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A5F938
Octal
51374470
Decimal
10,877,240
Country
US
Tail
N484UA
Type
A320
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
453
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A5F938.

Country allocation

The ICAO 24-bit address A5F938 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
UAL557 United Airlines 9 2026-04-17
UAL1564 - 7 2026-07-17
UAL2329 United Airlines 6 2026-07-26
UAL1003 - 6 2026-07-14
UAL303 United Airlines 5 2026-07-22
UAL1554 - 5 2026-07-11
UAL658 United Airlines 4 2026-07-23
UAL561 United Airlines 4 2026-05-25
UAL473 United Airlines 4 2026-05-17
UAL455 United Airlines 4 2026-07-22
UAL2838 - 4 2026-06-27
UAL2745 United Airlines 4 2026-04-18
UAL2427 United Airlines 4 2026-07-24
UAL1762 United Airlines 4 2026-07-24
UAL1625 - 4 2026-07-12
UAL790 - 3 2026-07-12
UAL724 - 3 2026-06-28
UAL664 - 3 2026-07-21
UAL314 United Airlines 3 2026-07-26
UAL2684 United Airlines 3 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL314 DEN → EWR Jul 26, 19:50 UTCJul 26, 22:00 UTC2h 10m
2026-07-26 UAL1464 EWR → FLL Jul 26, 16:05 UTCJul 26, 18:30 UTC2h 25m
2026-07-26 UAL2329 RNO → SFO Jul 26, 12:20 UTCJul 26, 14:25 UTC2h 5m
2026-07-26 UAL1237 SFO → SEA Jul 26, 01:45 UTCJul 26, 03:45 UTC2h 0m
2026-07-26 UAL1237 SFO → SEA Jul 26, 01:39 UTCJul 26, 03:43 UTC2h 4m
2026-07-25 UAL625 BOS → ORD Jul 25, 21:10 UTCJul 25, 23:50 UTC2h 40m
2026-07-25 UAL2004 ORD → SFO Jul 25, 16:45 UTCJul 25, 19:20 UTC2h 35m
2026-07-25 UAL2004 ORD → SFO Jul 25, 16:35 UTCJul 25, 19:11 UTC2h 36m
2026-07-24 UAL1762 SDF → DEN Jul 24, 23:05 UTCJul 25, 02:00 UTC2h 55m
2026-07-24 UAL1762 SDF → DEN Jul 24, 22:42 UTCJul 25, 02:11 UTC3h 29m
2026-07-24 UAL2427 ORD → SXM Jul 24, 17:15 UTCJul 24, 19:00 UTC1h 45m
2026-07-24 UAL1857 BWI → ORD Jul 24, 12:56 UTCJul 24, 13:52 UTC56m
2026-07-24 UAL1857 BWI → ORD Jul 24, 12:45 UTCJul 24, 13:50 UTC1h 5m
2026-07-24 UAL1842 IAD → DEN Jul 24, 02:55 UTCJul 24, 04:05 UTC1h 10m
2026-07-23 UAL658 AUS → EWR Jul 23, 23:25 UTCJul 23, 23:55 UTC30m
2026-07-23 UAL658 AUS → EWR Jul 23, 22:30 UTCJul 23, 23:55 UTC1h 25m
2026-07-23 UAL658 AUS → EWR Jul 23, 22:29 UTCJul 23, 23:10 UTC41m
2026-07-23 UAL2298 SFO → PHX Jul 23, 20:00 UTCJul 23, 21:00 UTC1h 0m
2026-07-23 UAL1114 SFO → ORD Jul 23, 15:00 UTCJul 23, 16:55 UTC1h 55m
2026-07-23 UAL1673 CLE → ORD Jul 23, 01:15 UTCJul 23, 03:05 UTC1h 50m
2026-07-23 UAL1673 CLE → ORD Jul 23, 01:27 UTCJul 23, 03:00 UTC1h 33m
2026-07-22 UAL2738 IAD → EWR Jul 22, 22:00 UTCJul 22, 23:15 UTC1h 15m
2026-07-22 UAL2765 HND → SFO Jul 22, 19:15 UTCJul 22, 20:20 UTC1h 5m
2026-07-22 UAL455 ORD → MSN Jul 22, 16:10 UTCJul 22, 17:30 UTC1h 20m
2026-07-22 UAL1285 BDL → IAH Jul 22, 14:00 UTCJul 22, 15:00 UTC1h 0m
2026-07-22 UAL303 FLL → EWR Jul 22, 00:20 UTCJul 22, 01:45 UTC1h 25m
2026-07-21 UAL664 - Jul 21, 22:15 UTCJul 21, 23:15 UTC1h 0m
2026-07-21 UAL664 LAS → ORD Jul 21, 22:04 UTCJul 21, 23:14 UTC1h 10m
2026-07-21 UAL2180 - Jul 21, 19:20 UTCJul 21, 20:20 UTC1h 0m
2026-07-21 UAL2180 PIT → ORD Jul 21, 18:54 UTCJul 21, 20:04 UTC1h 10m
2026-07-21 UAL8271 ORD → SFO Jul 21, 16:01 UTCJul 21, 17:40 UTC1h 39m
2026-07-21 UAL8271 ORD → SFO Jul 21, 15:45 UTCJul 21, 18:00 UTC2h 15m
2026-07-21 UAL1857 BWI → ORD Jul 21, 12:55 UTCJul 21, 14:00 UTC1h 5m
2026-07-21 UAL1842 IAD → DEN Jul 21, 03:52 UTCJul 21, 05:04 UTC1h 12m
2026-07-21 UAL1842 IAD → DEN Jul 21, 03:50 UTCJul 21, 05:05 UTC1h 15m
2026-07-21 UAL303 FLL → EWR Jul 21, 00:50 UTCJul 21, 02:05 UTC1h 15m
2026-07-20 UAL664 - Jul 20, 21:35 UTCJul 20, 22:30 UTC55m
2026-07-20 UAL2605 - Jul 20, 18:35 UTCJul 20, 19:15 UTC40m
2026-07-20 UAL2807 ORD → ORF Jul 20, 16:15 UTCJul 20, 16:45 UTC30m
2026-07-20 UAL2807 ORD → ORF Jul 20, 16:16 UTCJul 20, 16:48 UTC32m
2026-07-20 UAL1338 LGA → ORD Jul 20, 13:25 UTCJul 20, 14:10 UTC45m
2026-07-20 UAL8126 - Jul 20, 01:05 UTCJul 20, 01:50 UTC45m
2026-07-19 UAL658 AUS → EWR Jul 19, 22:25 UTCJul 19, 23:15 UTC50m
2026-07-19 UAL2298 SFO → PHX Jul 19, 19:50 UTCJul 19, 21:10 UTC1h 20m
2026-07-19 UAL2298 SFO → PHX Jul 19, 20:03 UTCJul 19, 21:05 UTC1h 2m
2026-07-19 UAL2774 - Jul 19, 13:50 UTCJul 19, 15:30 UTC1h 40m
2026-07-19 UAL1627 - Jul 19, 00:00 UTCJul 19, 02:25 UTC2h 25m
2026-07-19 UAL1627 IAH → DCA Jul 19, 00:01 UTCJul 19, 02:21 UTC2h 20m
2026-07-18 UAL2263 EWR → FLL Jul 18, 20:35 UTCJul 18, 21:55 UTC1h 20m
2026-07-18 UAL2263 EWR → FLL Jul 18, 19:39 UTCJul 18, 21:51 UTC2h 12m

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 N484UA page for operator, model, and routing details .

Mode-S A5F938 frequently asked

What is Mode-S code A5F938?
A5F938 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N484UA.
Where is Mode-S A5F938 registered?
Mode-S code A5F938 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 A5F938 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5F938, octal 51374470, decimal 10,877,240.
What flights does A5F938 operate?
Mode-S A5F938 has broadcast 20 distinct callsigns, including UAL557, UAL1564, UAL2329, UAL1003, UAL303.