Apparatus

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sensors Mode-S transponder

A494EB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N39463 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A494EB
Octal
51112353
Decimal
10,786,027
Country
US
Tail
N39463
Type
B739
Broadcasting now · callsign UAL1850 · 7,050 ft
Flights observed
377
Distinct callsigns
20
Country
US
Last broadcast
37m ago

Current position

A494EB is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A494EB 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
UAL2690 - 5 2026-07-07
UAL493 United Airlines 4 2026-04-20
UAL2646 United Airlines 4 2026-04-16
UAL2155 - 4 2026-07-11
UAL1686 - 4 2026-07-10
UAL1416 United Airlines 4 2026-06-11
UAL703 United Airlines 3 2026-06-08
UAL662 United Airlines 3 2026-04-17
UAL444 United Airlines 3 2026-06-01
UAL2863 United Airlines 3 2026-05-17
UAL2827 United Airlines 3 2026-05-25
UAL2640 United Airlines 3 2026-06-14
UAL254 United Airlines 3 2026-07-04
UAL2375 United Airlines 3 2026-04-17
UAL2324 - 3 2026-06-28
UAL2294 - 3 2026-04-13
UAL2240 - 3 2026-07-12
UAL2136 United Airlines 3 2026-06-01
UAL2117 - 3 2026-06-16
UAL1912 United Airlines 3 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1850 - Jul 14, 15:40 UTCJul 14, 16:45 UTC1h 5m
2026-07-14 UAL2420 MSY → ORD Jul 14, 11:35 UTCJul 14, 13:40 UTC2h 5m
2026-07-14 UAL2042 IAD → MSY Jul 14, 01:15 UTCJul 14, 03:20 UTC2h 5m
2026-07-13 UAL2497 MSY → IAD Jul 13, 17:20 UTCJul 13, 19:25 UTC2h 5m
2026-07-13 UAL2253 IAD → MSY Jul 13, 12:55 UTCJul 13, 15:05 UTC2h 10m
2026-07-12 UAL8150 ORD → IAD Jul 12, 23:35 UTCJul 13, 01:01 UTC1h 25m
2026-07-12 UAL1393 IAD → ORD Jul 12, 20:10 UTCJul 12, 21:45 UTC1h 35m
2026-07-12 UAL2081 - Jul 12, 13:25 UTCJul 12, 18:05 UTC4h 40m
2026-07-12 UAL2240 - Jul 12, 01:05 UTCJul 12, 02:55 UTC1h 50m
2026-07-11 UAL1248 DEN → DEN Jul 11, 17:55 UTCJul 11, 23:35 UTC5h 40m
2026-07-11 UAL1765 - Jul 11, 12:45 UTCJul 11, 15:30 UTC2h 45m
2026-07-11 UAL2155 - Jul 11, 01:25 UTCJul 11, 03:55 UTC2h 30m
2026-07-11 UAL2155 DEN → PIT Jul 11, 00:40 UTCJul 11, 04:04 UTC3h 24m
2026-07-10 UAL1615 PHX → DEN Jul 10, 21:45 UTCJul 10, 23:05 UTC1h 20m
2026-07-10 UAL1686 DEN → PHX Jul 10, 18:50 UTCJul 10, 20:15 UTC1h 25m
2026-07-10 UAL557 - Jul 10, 16:05 UTCJul 10, 17:15 UTC1h 10m
2026-07-10 UAL557 BIL → DEN Jul 10, 16:02 UTCJul 10, 17:10 UTC1h 8m
2026-07-10 UAL1417 - Jul 10, 02:35 UTCJul 10, 03:40 UTC1h 5m
2026-07-09 UAL1092 - Jul 9, 20:45 UTCJul 10, 00:20 UTC3h 35m
2026-07-09 UAL1308 - Jul 9, 16:30 UTCJul 9, 19:00 UTC2h 30m
2026-07-09 UAL1308 DEN → PIT Jul 9, 16:36 UTCJul 9, 19:00 UTC2h 24m
2026-07-09 UAL1232 SLC → DEN Jul 9, 13:40 UTCJul 9, 14:35 UTC55m
2026-07-09 UAL8179 DEN → SLC Jul 9, 02:45 UTCJul 9, 03:50 UTC1h 5m
2026-07-08 UAL395 IAD → DEN Jul 8, 20:35 UTCJul 9, 00:45 UTC4h 10m
2026-07-08 UAL1421 - Jul 8, 16:30 UTCJul 8, 18:25 UTC1h 55m
2026-07-08 UAL1364 EWR → FLL Jul 8, 11:15 UTCJul 8, 13:45 UTC2h 30m
2026-07-08 UAL404C - Jul 8, 03:10 UTCJul 8, 06:00 UTC2h 50m
2026-07-07 UAL2690 - Jul 7, 18:35 UTCJul 7, 21:55 UTC3h 20m
2026-07-07 UAL2204 TPA → EWR Jul 7, 13:15 UTCJul 7, 15:20 UTC2h 5m
2026-07-07 UAL1312 - Jul 7, 00:15 UTCJul 7, 02:00 UTC1h 45m
2026-07-06 UAL2690 - Jul 6, 18:50 UTCJul 6, 22:05 UTC3h 15m
2026-07-06 UAL279 - Jul 6, 15:05 UTCJul 6, 17:25 UTC2h 20m
2026-07-05 UAL651 - Jul 5, 17:45 UTCJul 5, 20:05 UTC2h 20m
2026-07-05 UAL2301 ORD → EWR Jul 5, 14:25 UTCJul 5, 16:06 UTC1h 41m
2026-07-05 UAL2301 ORD → EWR Jul 5, 14:25 UTCJul 5, 16:05 UTC1h 40m
2026-07-05 UAL1778 - Jul 5, 10:35 UTCJul 5, 12:00 UTC1h 25m
2026-07-05 UAL8185 ORD → ROC Jul 5, 00:32 UTCJul 5, 01:23 UTC51m
2026-07-05 UAL8185 ORD → ROC Jul 5, 00:20 UTCJul 5, 01:30 UTC1h 10m
2026-07-04 UAL2179 MSY → ORD Jul 4, 19:10 UTCJul 4, 22:35 UTC3h 25m
2026-07-04 UAL1850 ORD → MSY Jul 4, 16:05 UTCJul 4, 17:55 UTC1h 50m
2026-07-04 UAL656 - Jul 4, 13:30 UTCJul 4, 14:15 UTC45m
2026-07-04 UAL656 CID → ORD Jul 4, 13:24 UTCJul 4, 14:07 UTC43m
2026-07-04 UAL1923 - Jul 4, 07:20 UTCJul 4, 07:55 UTC35m
2026-07-04 UAL1923 ORD → CID Jul 4, 07:33 UTCJul 4, 07:49 UTC16m
2026-07-04 UAL254 ORD → BOS Jul 4, 05:05 UTCJul 4, 05:25 UTC20m
2026-07-04 UAL254 ORD → BOS Jul 4, 02:53 UTCJul 4, 04:46 UTC1h 53m
2026-07-04 UAL254 ORD → BOS Jul 4, 03:05 UTCJul 4, 05:25 UTC2h 20m
2026-07-02 UAL1340 - Jul 2, 16:40 UTCJul 2, 19:40 UTC3h 0m
2026-07-02 UAL2438 - Jul 2, 11:15 UTCJul 2, 14:05 UTC2h 50m
2026-07-02 UAL2438 EWR → IAH Jul 2, 11:24 UTCJul 2, 14:01 UTC2h 37m

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 N39463 page for operator, model, and routing details .

Mode-S A494EB frequently asked

What is Mode-S code A494EB?
A494EB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N39463.
Where is Mode-S A494EB registered?
Mode-S code A494EB 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 A494EB broadcasting right now?
Yes. Mode-S A494EB is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A494EB, octal 51112353, decimal 10,786,027.
What flights does A494EB operate?
Mode-S A494EB has broadcast 20 distinct callsigns, including UAL2690, UAL493, UAL2646, UAL2155, UAL1686.