Apparatus

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sensors Mode-S transponder

A5EE13

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N481UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A5EE13
Octal
51367023
Decimal
10,874,387
Country
US
Tail
N481UA
Type
A320
No current signal · last broadcast 6d ago
Flights observed
383
Distinct callsigns
20
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A5EE13.

Country allocation

The ICAO 24-bit address A5EE13 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
UAL2447 - 5 2026-06-15
UAL2329 United Airlines 5 2026-06-18
UAL1438 United Airlines 5 2026-06-05
UAL579 United Airlines 4 2026-06-05
UAL2850 - 4 2026-07-04
UAL2101 United Airlines 4 2026-04-25
UAL1639 United Airlines 4 2026-05-19
UAL1550 United Airlines 4 2026-05-17
UAL1235 United Airlines 4 2026-06-11
UAL8190 - 3 2026-06-22
UAL645 - 3 2026-07-06
UAL516 United Airlines 3 2026-05-09
UAL429 United Airlines 3 2026-05-24
UAL304 United Airlines 3 2026-06-01
UAL2817 United Airlines 3 2026-06-16
UAL2366 United Airlines 3 2026-06-03
UAL2274 United Airlines 3 2026-04-15
UAL2265 - 3 2026-06-27
UAL2262 - 3 2026-06-26
UAL2157 United Airlines 3 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-07 UAL3898 - Jul 7, 21:20 UTCJul 7, 22:55 UTC1h 35m
2026-07-06 UAL2437 - Jul 6, 21:20 UTCJul 6, 22:45 UTC1h 25m
2026-07-06 UAL2180 DEN → SFO Jul 6, 18:20 UTCJul 6, 19:25 UTC1h 5m
2026-07-06 UAL2771 ORD → PIT Jul 6, 16:01 UTCJul 6, 16:41 UTC40m
2026-07-06 UAL2771 ORD → PIT Jul 6, 15:45 UTCJul 6, 16:45 UTC1h 0m
2026-07-06 UAL1857 - Jul 6, 12:55 UTCJul 6, 14:20 UTC1h 25m
2026-07-06 UAL645 DEN → FSD Jul 6, 00:05 UTCJul 6, 01:15 UTC1h 10m
2026-07-05 UAL645 TPA → DEN Jul 5, 23:51 UTCJul 6, 01:09 UTC1h 18m
2026-07-05 UAL1790 EWR → MYR Jul 5, 20:20 UTCJul 5, 22:20 UTC2h 0m
2026-07-05 UAL1578 IAH → LAX Jul 5, 17:55 UTCJul 5, 18:26 UTC31m
2026-07-05 UAL1578 IAH → LAX Jul 5, 17:45 UTCJul 5, 18:30 UTC45m
2026-07-05 UAL1808 CHS → EWR Jul 5, 12:10 UTCJul 5, 15:50 UTC3h 40m
2026-07-04 UAL283 - Jul 4, 16:15 UTCJul 4, 19:30 UTC3h 15m
2026-07-04 UAL2850 - Jul 4, 02:25 UTCJul 4, 03:20 UTC55m
2026-07-04 UAL1613 EWR → FLL Jul 4, 00:05 UTCJul 4, 00:30 UTC25m
2026-07-03 UAL2279 PDX → SFO Jul 3, 20:50 UTCJul 3, 22:10 UTC1h 20m
2026-07-03 UAL1301 SFO → PDX Jul 3, 17:30 UTCJul 3, 18:55 UTC1h 25m
2026-07-03 UAL1808 CHS → EWR Jul 3, 12:15 UTCJul 3, 16:00 UTC3h 45m
2026-07-03 UAL1808 CHS → EWR Jul 3, 12:18 UTCJul 3, 16:00 UTC3h 42m
2026-07-03 UAL648 SFO → MSP Jul 3, 00:45 UTCJul 3, 04:00 UTC3h 15m
2026-07-03 UAL648 EWR → SFO Jul 3, 00:53 UTCJul 3, 03:56 UTC3h 3m
2026-07-02 UAL2305 SBA → SFO Jul 2, 22:55 UTCJul 2, 23:40 UTC45m
2026-07-02 UAL671 DEN → SBA Jul 2, 17:35 UTCJul 2, 19:45 UTC2h 10m
2026-07-02 UAL2383 - Jul 2, 12:50 UTCJul 2, 16:00 UTC3h 10m
2026-07-02 UAL8171 DEN → RDU Jul 2, 00:05 UTCJul 2, 03:00 UTC2h 55m
2026-07-01 UAL1942 EUG → DEN Jul 1, 20:25 UTCJul 1, 22:30 UTC2h 5m
2026-07-01 UAL790 - Jul 1, 18:05 UTCJul 1, 19:10 UTC1h 5m
2026-07-01 UAL336 DEN → SFO Jul 1, 03:30 UTCJul 1, 17:00 UTC13h 30m
2026-06-30 UAL1322 DEN → DEN Jun 30, 20:00 UTCJul 1, 02:20 UTC6h 20m
2026-06-30 UAL1505 SEA → DEN Jun 30, 16:25 UTCJun 30, 18:30 UTC2h 5m
2026-06-30 UAL1482 DEN → SEA Jun 30, 12:10 UTCJun 30, 14:30 UTC2h 20m
2026-06-30 UAL1035 SJC → DEN Jun 30, 01:50 UTCJun 30, 03:55 UTC2h 5m
2026-06-29 UAL1883 SFO → SJD Jun 29, 22:05 UTCJun 30, 00:25 UTC2h 20m
2026-06-29 UAL248 DFW → DEN Jun 29, 19:05 UTCJun 29, 20:35 UTC1h 30m
2026-06-29 UAL355 DEN → DFW Jun 29, 16:10 UTCJun 29, 17:40 UTC1h 30m
2026-06-29 UAL724 - Jun 29, 13:24 UTCJun 29, 14:39 UTC1h 15m
2026-06-29 UAL333 - Jun 29, 01:44 UTCJun 29, 03:10 UTC1h 25m
2026-06-28 UAL720 - Jun 28, 21:10 UTCJun 29, 00:00 UTC2h 50m
2026-06-28 UAL2787 - Jun 28, 17:25 UTCJun 28, 19:49 UTC2h 25m
2026-06-28 UAL2838 - Jun 28, 14:19 UTCJun 28, 15:34 UTC1h 15m
2026-06-28 UAL2838 OMA → DEN Jun 28, 14:31 UTCJun 28, 15:34 UTC1h 3m
2026-06-27 UAL692 - Jun 27, 21:29 UTCJun 28, 00:09 UTC2h 40m
2026-06-27 UAL1613 EWR → FLL Jun 27, 18:39 UTCJun 27, 19:59 UTC1h 20m
2026-06-27 UAL2265 SFO → PDX Jun 27, 15:45 UTCJun 27, 17:09 UTC1h 25m
2026-06-27 UAL2265 SFO → PDX Jun 27, 15:44 UTCJun 27, 17:03 UTC1h 19m
2026-06-27 UAL2340 ORD → MCO Jun 27, 13:32 UTCJun 27, 14:23 UTC51m
2026-06-27 UAL2340 ORD → MCO Jun 27, 13:40 UTCJun 27, 14:25 UTC45m
2026-06-27 UAL8166 SFO → JAC Jun 27, 05:59 UTCJun 27, 06:44 UTC45m
2026-06-27 UAL2850 - Jun 27, 04:09 UTCJun 27, 05:04 UTC55m
2026-06-27 UAL2850 RNO → SFO Jun 27, 03:37 UTCJun 27, 04:57 UTC1h 20m

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 N481UA page for operator, model, and routing details .

Mode-S A5EE13 frequently asked

What is Mode-S code A5EE13?
A5EE13 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N481UA.
Where is Mode-S A5EE13 registered?
Mode-S code A5EE13 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 A5EE13 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5EE13, octal 51367023, decimal 10,874,387.
What flights does A5EE13 operate?
Mode-S A5EE13 has broadcast 20 distinct callsigns, including UAL2447, UAL2329, UAL1438, UAL579, UAL2850.