Apparatus

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sensors Mode-S transponder

A239E0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24202 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A239E0
Octal
50434740
Decimal
10,631,648
Country
US
Tail
N24202
Type
B738
Broadcasting now · callsign UAL1082 · 38,000 ft
Flights observed
314
Distinct callsigns
20
Country
US
Last broadcast
8m ago

Current position

A239E0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A239E0 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
UAL2637 United Airlines 5 2026-05-25
UAL766 United Airlines 4 2026-04-16
UAL2424 United Airlines 4 2026-04-26
UAL1325 United Airlines 4 2026-04-18
UAL1185 United Airlines 4 2026-06-05
UAL637 United Airlines 3 2026-04-13
UAL547 United Airlines 3 2026-06-05
UAL525 - 3 2026-07-11
UAL424 United Airlines 3 2026-06-09
UAL364 United Airlines 3 2026-05-16
UAL2745 United Airlines 3 2026-05-25
UAL2422 United Airlines 3 2026-04-17
UAL235 United Airlines 3 2026-04-26
UAL2272 United Airlines 3 2026-05-14
UAL1935 United Airlines 3 2026-06-12
UAL1592 United Airlines 3 2026-05-01
UAL1501 United Airlines 3 2026-06-03
UAL779 United Airlines 2 2026-05-30
UAL671 United Airlines 2 2026-05-22
UAL596 - 2 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1082 - Jul 14, 15:25 UTCJul 14, 16:00 UTC35m
2026-07-14 UAL2822 LGA → ORD Jul 14, 11:37 UTCJul 14, 13:21 UTC1h 44m
2026-07-14 UAL2822 LGA → ORD Jul 14, 11:45 UTCJul 14, 13:20 UTC1h 35m
2026-07-14 UAL1655 ORD → LGA Jul 14, 01:10 UTCJul 14, 02:55 UTC1h 45m
2026-07-13 UAL329 - Jul 13, 21:05 UTCJul 13, 23:00 UTC1h 55m
2026-07-13 UAL2418 - Jul 13, 16:20 UTCJul 13, 19:40 UTC3h 20m
2026-07-13 UAL596 LAS → DEN Jul 13, 12:44 UTCJul 13, 13:52 UTC1h 8m
2026-07-13 UAL596 LAS → DEN Jul 13, 12:30 UTCJul 13, 13:55 UTC1h 25m
2026-07-13 UAL1546 LAX → LAS Jul 13, 06:10 UTCJul 13, 07:01 UTC50m
2026-07-13 UAL1546 LAX → LAS Jul 13, 06:17 UTCJul 13, 07:01 UTC44m
2026-07-13 UAL2282 - Jul 13, 04:15 UTCJul 13, 04:55 UTC40m
2026-07-13 UAL751 SFO → LAS Jul 13, 01:25 UTCJul 13, 02:30 UTC1h 5m
2026-07-12 UAL1212 SFO → SFO Jul 12, 16:10 UTCJul 12, 23:35 UTC7h 25m
2026-07-12 UAL717 - Jul 12, 13:05 UTCJul 12, 14:05 UTC1h 0m
2026-07-12 UAL548 - Jul 12, 05:40 UTCJul 12, 06:30 UTC50m
2026-07-12 UAL2142 - Jul 12, 00:05 UTCJul 12, 04:30 UTC4h 25m
2026-07-11 UAL213 IAD → BNA Jul 11, 17:15 UTCJul 11, 18:40 UTC1h 25m
2026-07-11 UAL525 AUS → IAD Jul 11, 12:40 UTCJul 11, 15:40 UTC3h 0m
2026-07-11 UAL525 AUS → IAD Jul 11, 12:44 UTCJul 11, 15:38 UTC2h 54m
2026-07-11 UAL2332 OAK → AUS Jul 11, 00:40 UTCJul 11, 03:40 UTC3h 0m
2026-07-10 UAL1375 - Jul 10, 22:05 UTCJul 10, 23:05 UTC1h 0m
2026-07-10 UAL430 DEN → ONT Jul 10, 17:45 UTCJul 10, 19:35 UTC1h 50m
2026-07-10 UAL430 DEN → ONT Jul 10, 17:47 UTCJul 10, 19:39 UTC1h 52m
2026-07-10 UAL2853 - Jul 10, 14:05 UTCJul 10, 15:55 UTC1h 50m
2026-07-10 UAL1542 - Jul 10, 01:20 UTCJul 10, 01:55 UTC35m
2026-07-09 UAL1867 - Jul 9, 21:00 UTCJul 9, 22:55 UTC1h 55m
2026-07-09 UAL1919 - Jul 9, 17:35 UTCJul 9, 19:20 UTC1h 45m
2026-07-09 UAL1919 IAH → CZM Jul 9, 17:41 UTCJul 9, 19:20 UTC1h 39m
2026-07-09 UAL1957 - Jul 9, 12:05 UTCJul 9, 15:10 UTC3h 5m
2026-07-09 UAL2605 ORD → LGA Jul 9, 01:00 UTCJul 9, 02:40 UTC1h 40m
2026-07-08 UAL3890 - Jul 8, 20:25 UTCJul 8, 21:55 UTC1h 30m
2026-07-08 UAL3890 IAB → ORD Jul 8, 20:00 UTCJul 8, 21:35 UTC1h 35m
2026-06-23 UAL4195 - Jun 23, 15:55 UTCJun 23, 16:50 UTC55m
2026-06-19 UAL3892 IAD → EWR Jun 19, 02:59 UTCJun 19, 04:29 UTC1h 30m
2026-06-18 UAL2769 DEN → LAS Jun 18, 22:49 UTCJun 19, 00:46 UTC1h 57m
2026-06-18 UAL2769 DEN → LAS Jun 18, 23:00 UTCJun 19, 01:04 UTC2h 4m
2026-06-18 UAL1821 ORD → LGA Jun 18, 19:33 UTCJun 18, 21:10 UTC1h 37m
2026-06-18 UAL1821 ORD → LGA Jun 18, 19:35 UTCJun 18, 21:10 UTC1h 35m
2026-06-18 UAL1129 EWR → SEA Jun 18, 16:15 UTCJun 18, 16:55 UTC40m
2026-06-18 UAL466 - Jun 18, 14:01 UTCJun 18, 14:35 UTC35m
2026-06-18 UAL1778 IAD → ORD Jun 18, 10:30 UTCJun 18, 12:05 UTC1h 35m
2026-06-17 UAL376 AUS → IAD Jun 17, 22:15 UTCJun 18, 01:00 UTC2h 45m
2026-06-17 UAL2746 LAS → SFO Jun 17, 17:41 UTCJun 17, 20:22 UTC2h 41m
2026-06-17 UAL2746 LAS → SFO Jun 17, 17:30 UTCJun 17, 20:25 UTC2h 55m
2026-06-17 UAL525 IAD → AMM Jun 17, 12:50 UTCJun 17, 15:30 UTC2h 40m
2026-06-16 UAL2337 IAD → AUS Jun 16, 22:25 UTCJun 17, 01:20 UTC2h 55m
2026-06-16 UAL2337 IAD → AUS Jun 16, 22:24 UTCJun 17, 01:20 UTC2h 56m
2026-06-16 UAL1140 LAS → IAD Jun 16, 16:05 UTCJun 16, 20:05 UTC4h 1m
2026-06-16 UAL1764 IAD → LAS Jun 16, 00:24 UTCJun 16, 05:10 UTC4h 45m
2026-06-15 UAL2437 - Jun 15, 21:20 UTCJun 15, 22:40 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 N24202 page for operator, model, and routing details .

Mode-S A239E0 frequently asked

What is Mode-S code A239E0?
A239E0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24202.
Where is Mode-S A239E0 registered?
Mode-S code A239E0 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 A239E0 broadcasting right now?
Yes. Mode-S A239E0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A239E0, octal 50434740, decimal 10,631,648.
What flights does A239E0 operate?
Mode-S A239E0 has broadcast 20 distinct callsigns, including UAL2637, UAL766, UAL2424, UAL1325, UAL1185.