Apparatus

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sensors Mode-S transponder

A2452F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24519 · operated by UNITED AIRLINES INC

Hex
A2452F
Octal
50442457
Decimal
10,634,543
Country
US
Tail
N24519
Type
A21N
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
413
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S A2452F.

Country allocation

The ICAO 24-bit address A2452F 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
UAL789 United Airlines 5 2026-06-04
UAL647 United Airlines 5 2026-04-26
UAL2494 - 5 2026-07-10
UAL2361 - 5 2026-06-18
UAL2113 - 5 2026-06-18
UAL2106 - 5 2026-06-24
UAL2088 - 5 2026-07-19
UAL1740 - 5 2026-07-10
UAL1686 United Airlines 5 2026-05-14
UAL1667 United Airlines 5 2026-04-15
UAL1659 - 5 2026-04-15
UAL1430 - 5 2026-06-17
UAL800 - 4 2026-06-16
UAL2481 - 4 2026-07-03
UAL2455 United Airlines 4 2026-06-02
UAL2440 - 4 2026-07-09
UAL2061 United Airlines 4 2026-06-13
UAL1996 United Airlines 4 2026-07-19
UAL1970 United Airlines 4 2026-04-25
UAL1958 United Airlines 4 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1013 DEN → LAX Jul 26, 18:15 UTCJul 26, 20:05 UTC1h 50m
2026-07-26 UAL526 AMM → IAD Jul 26, 13:55 UTCJul 26, 16:00 UTC2h 5m
2026-07-26 UAL1672 DEN → SFO Jul 26, 08:40 UTCJul 26, 11:55 UTC3h 15m
2026-07-25 UAL1875 FLL → EWR Jul 25, 21:20 UTCJul 26, 00:35 UTC3h 15m
2026-07-25 UAL2825 ORD → PHL Jul 25, 16:25 UTCJul 25, 18:10 UTC1h 45m
2026-07-25 UAL2034 IAH → SFO Jul 25, 13:00 UTCJul 25, 14:30 UTC1h 30m
2026-07-25 UAL2034 IAH → SFO Jul 25, 13:03 UTCJul 25, 14:29 UTC1h 26m
2026-07-24 UAL1338 LGA → ORD Jul 24, 13:00 UTCJul 24, 13:45 UTC45m
2026-07-24 UAL1338 LGA → ORD Jul 24, 13:07 UTCJul 24, 13:38 UTC31m
2026-07-24 UAL2426 IAH → BOS Jul 24, 01:10 UTCJul 24, 01:55 UTC45m
2026-07-23 UAL2835 SEA → ORD Jul 23, 18:15 UTCJul 23, 22:05 UTC3h 50m
2026-07-23 UAL341 EWR → BOS Jul 23, 12:25 UTCJul 23, 16:15 UTC3h 50m
2026-07-20 UAL609 - Jul 20, 15:10 UTCJul 20, 16:05 UTC55m
2026-07-20 UAL1488 - Jul 20, 13:10 UTCJul 20, 14:00 UTC50m
2026-07-19 UAL2088 - Jul 19, 22:40 UTCJul 20, 00:40 UTC2h 0m
2026-07-19 UAL2088 - Jul 19, 20:15 UTCJul 19, 20:25 UTC10m
2026-07-19 UAL2088 SJU → ORD Jul 19, 20:10 UTCJul 20, 00:23 UTC4h 13m
2026-07-19 UAL1996 ORD → SJU Jul 19, 14:10 UTCJul 19, 18:15 UTC4h 5m
2026-07-19 UAL1193 - Jul 19, 05:20 UTCJul 19, 05:25 UTC5m
2026-07-19 UAL1193 DCA → ORD Jul 19, 03:35 UTCJul 19, 05:25 UTC1h 50m
2026-07-19 UAL1193 DCA → ORD Jul 19, 03:31 UTCJul 19, 05:04 UTC1h 33m
2026-07-19 UAL1314 EWR → JAX Jul 19, 00:25 UTCJul 19, 01:55 UTC1h 30m
2026-07-19 UAL1314 EWR → JAX Jul 19, 00:38 UTCJul 19, 01:49 UTC1h 11m
2026-07-18 UAL2197 - Jul 18, 00:15 UTCJul 18, 02:25 UTC2h 10m
2026-07-18 UAL2197 IAH → ORD Jul 18, 00:12 UTCJul 18, 02:06 UTC1h 54m
2026-07-17 UAL2451 - Jul 17, 20:44 UTCJul 17, 22:49 UTC2h 5m
2026-07-17 UAL2466 MCO → ORD Jul 17, 15:10 UTCJul 17, 17:30 UTC2h 20m
2026-07-17 UAL284 - Jul 17, 11:04 UTCJul 17, 13:15 UTC2h 10m
2026-07-16 UAL1625 AUS → ORD Jul 16, 23:05 UTCJul 17, 01:25 UTC2h 20m
2026-07-16 UAL1061 - Jul 16, 18:29 UTCJul 16, 21:05 UTC2h 35m
2026-07-14 UAL2616 IAH → ORD Jul 14, 13:40 UTCJul 14, 16:30 UTC2h 50m
2026-07-14 UAL2813 - Jul 14, 01:35 UTCJul 14, 03:40 UTC2h 5m
2026-07-13 UAL2497 IAD → ORD Jul 13, 22:05 UTCJul 13, 23:35 UTC1h 30m
2026-07-13 UAL2794 ORD → IAD Jul 13, 19:20 UTCJul 13, 20:45 UTC1h 25m
2026-07-13 UAL580 - Jul 13, 12:15 UTCJul 13, 16:00 UTC3h 45m
2026-07-13 UAL2060 - Jul 13, 03:10 UTCJul 13, 06:35 UTC3h 25m
2026-07-13 UAL2060 ORD → LAX Jul 13, 03:03 UTCJul 13, 06:34 UTC3h 31m
2026-07-12 UAL675 DEN → ORD Jul 12, 23:05 UTCJul 13, 01:05 UTC2h 0m
2026-07-12 UAL2802 ORD → DEN Jul 12, 18:59 UTCJul 12, 20:41 UTC1h 42m
2026-07-12 UAL2802 ORD → DEN Jul 12, 18:45 UTCJul 12, 20:45 UTC2h 0m
2026-07-12 UAL2089 - Jul 12, 14:01 UTCJul 12, 16:05 UTC2h 5m
2026-07-12 UAL2089 - Jul 12, 11:45 UTCJul 12, 11:55 UTC10m
2026-07-12 UAL695 - Jul 12, 00:05 UTCJul 12, 00:30 UTC25m
2026-07-11 UAL695 - Jul 11, 20:10 UTCJul 11, 22:30 UTC2h 20m
2026-07-11 UAL2618 SEA → ORD Jul 11, 14:05 UTCJul 11, 17:35 UTC3h 30m
2026-07-10 UAL1801 ORD → SEA Jul 10, 22:20 UTCJul 11, 02:15 UTC3h 55m
2026-07-10 UAL2494 RSW → ORD Jul 10, 16:30 UTCJul 10, 19:10 UTC2h 40m
2026-07-10 UAL1740 ORD → RSW Jul 10, 13:00 UTCJul 10, 15:15 UTC2h 15m
2026-07-09 UAL706 LAS → ORD Jul 9, 21:40 UTCJul 10, 00:45 UTC3h 5m
2026-07-09 UAL2440 - Jul 9, 16:30 UTCJul 9, 19:55 UTC3h 25m

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 N24519 page for operator, model, and routing details .

Mode-S A2452F frequently asked

What is Mode-S code A2452F?
A2452F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24519.
Where is Mode-S A2452F registered?
Mode-S code A2452F 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 A2452F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2452F, octal 50442457, decimal 10,634,543.
What flights does A2452F operate?
Mode-S A2452F has broadcast 20 distinct callsigns, including UAL789, UAL647, UAL2494, UAL2361, UAL2113.