Apparatus

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sensors Mode-S transponder

A245FB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24573 · operated by UNITED AIRLINES INC

Hex
A245FB
Octal
50442773
Decimal
10,634,747
Country
US
Tail
N24573
Broadcasting now · callsign UAL1233 · 32,750 ft
Flights observed
82
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Current position

A245FB is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A245FB 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
UAL2361 United Airlines 4 2026-07-20
UAL1998 - 3 2026-07-14
UAL1755 - 3 2026-07-11
UAL8197 - 2 2026-07-19
UAL792 United Airlines 2 2026-07-26
UAL617 United Airlines 2 2026-07-22
UAL534 United Airlines 2 2026-07-21
UAL531 United Airlines 2 2026-07-19
UAL530 - 2 2026-07-21
UAL459 United Airlines 2 2026-07-17
UAL4214 - 2 2026-07-01
UAL2610 United Airlines 2 2026-07-26
UAL2430 - 2 2026-07-09
UAL2113 United Airlines 2 2026-07-20
UAL1994 United Airlines 2 2026-07-21
UAL1792 - 2 2026-07-09
UAL1531 United Airlines 2 2026-07-25
UAL1411 United Airlines 2 2026-07-21
UAL1356 United Airlines 2 2026-07-22
UAL800 - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL598 EWR → CLE Jul 26, 17:45 UTCJul 26, 20:55 UTC3h 10m
2026-07-26 UAL792 LAX → EWR Jul 26, 12:33 UTCJul 26, 15:47 UTC3h 14m
2026-07-26 UAL792 LAX → EWR Jul 26, 12:30 UTCJul 26, 15:45 UTC3h 15m
2026-07-26 UAL1924 SAN → SFO Jul 26, 06:10 UTCJul 26, 09:00 UTC2h 51m
2026-07-26 UAL2610 IAD → PDX Jul 26, 02:05 UTCJul 26, 03:55 UTC1h 50m
2026-07-26 UAL2610 IAD → PDX Jul 26, 02:03 UTCJul 26, 03:50 UTC1h 47m
2026-07-25 UAL374 EWR → PBI Jul 25, 20:15 UTCJul 25, 23:55 UTC3h 40m
2026-07-25 UAL1069 SFO → LAX Jul 25, 14:05 UTCJul 25, 17:40 UTC3h 35m
2026-07-25 UAL1531 ORD → CMH Jul 25, 01:50 UTCJul 25, 05:25 UTC3h 35m
2026-07-25 UAL1531 ORD → CMH Jul 25, 01:58 UTCJul 25, 05:23 UTC3h 25m
2026-07-24 UAL2497 ORD → BOS Jul 24, 22:30 UTCJul 25, 00:10 UTC1h 40m
2026-07-24 UAL2794 GUM → SFO Jul 24, 18:55 UTCJul 24, 20:15 UTC1h 20m
2026-07-24 UAL1525 RDU → EWR Jul 24, 14:30 UTCJul 24, 16:50 UTC2h 20m
2026-07-24 UAL2295 PHX → EWR Jul 24, 11:10 UTCJul 24, 12:40 UTC1h 30m
2026-07-23 UAL2320 TPA → EWR Jul 23, 23:30 UTCJul 24, 02:35 UTC3h 5m
2026-07-23 UAL777 RSW → EWR Jul 23, 18:00 UTCJul 23, 21:15 UTC3h 15m
2026-07-23 UAL2315 BOS → ORD Jul 23, 13:50 UTCJul 23, 15:55 UTC2h 5m
2026-07-23 UAL1974 SFO → LAX Jul 23, 02:25 UTCJul 23, 04:35 UTC2h 10m
2026-07-22 UAL617 DEN → ORD Jul 22, 20:14 UTCJul 22, 21:59 UTC1h 45m
2026-07-22 UAL617 DEN → ORD Jul 22, 20:05 UTCJul 22, 22:05 UTC2h 0m
2026-07-22 UAL662 EWR → DFW Jul 22, 14:00 UTCJul 22, 18:15 UTC4h 15m
2026-07-22 UAL1356 SJC → DEN Jul 22, 00:10 UTCJul 22, 03:25 UTC3h 15m
2026-07-21 UAL1411 SFO → EWR Jul 21, 20:10 UTCJul 21, 22:35 UTC2h 25m
2026-07-21 UAL1994 SFO → PDX Jul 21, 14:55 UTCJul 21, 18:45 UTC3h 50m
2026-07-21 UAL530 - Jul 21, 10:50 UTCJul 21, 13:05 UTC2h 15m
2026-07-21 UAL534 HNL → LAX Jul 21, 00:40 UTCJul 21, 02:15 UTC1h 35m
2026-07-20 UAL2113 EWR → ATL Jul 20, 18:15 UTCJul 20, 22:05 UTC3h 50m
2026-07-20 UAL2361 SFO → IAH Jul 20, 12:33 UTCJul 20, 15:55 UTC3h 22m
2026-07-20 UAL2361 SFO → IAH Jul 20, 12:25 UTCJul 20, 16:00 UTC3h 35m
2026-07-20 UAL352 IAD → BOS Jul 20, 01:05 UTCJul 20, 03:00 UTC1h 55m
2026-07-19 UAL1351 SEA → DEN Jul 19, 20:15 UTCJul 19, 22:45 UTC2h 30m
2026-07-19 UAL2099 ORD → SEA Jul 19, 14:40 UTCJul 19, 18:35 UTC3h 55m
2026-07-19 UAL729 - Jul 19, 09:00 UTCJul 19, 12:55 UTC3h 55m
2026-07-19 UAL531 EWR → PBI Jul 19, 05:43 UTCJul 19, 07:23 UTC1h 40m
2026-07-19 UAL531 EWR → PBI Jul 19, 05:40 UTCJul 19, 07:30 UTC1h 50m
2026-07-19 UAL8197 - Jul 19, 00:40 UTCJul 19, 04:15 UTC3h 35m
2026-07-18 UAL8197 EWR → DEN Jul 18, 22:30 UTCJul 19, 04:20 UTC5h 50m
2026-07-18 UAL1423 DEN → EWR Jul 18, 17:10 UTCJul 18, 20:40 UTC3h 30m
2026-07-18 UAL670 - Jul 18, 10:45 UTCJul 18, 14:15 UTC3h 30m
2026-07-18 UAL2613 DEN → EWR Jul 18, 00:29 UTCJul 18, 03:45 UTC3h 16m
2026-07-17 UAL540 PDX → DEN Jul 17, 20:15 UTCJul 17, 22:25 UTC2h 10m
2026-07-17 UAL1506 DEN → SFO Jul 17, 16:44 UTCJul 17, 18:44 UTC2h 0m
2026-07-17 UAL459 ORD → LAS Jul 17, 12:15 UTCJul 17, 14:24 UTC2h 10m
2026-07-17 UAL459 ORD → LAS Jul 17, 12:11 UTCJul 17, 14:20 UTC2h 9m
2026-07-17 UAL498 DEN → PDX Jul 17, 02:10 UTCJul 17, 04:20 UTC2h 10m
2026-07-16 UAL333 SEA → DEN Jul 16, 22:10 UTCJul 17, 00:25 UTC2h 15m
2026-07-16 UAL1424 DEN → SEA Jul 16, 17:35 UTCJul 16, 19:55 UTC2h 20m
2026-07-16 UAL647 BOS → DEN Jul 16, 12:00 UTCJul 16, 15:55 UTC3h 55m
2026-07-16 UAL1356 DEN → BOS Jul 16, 00:45 UTCJul 16, 04:10 UTC3h 25m
2026-07-15 UAL1411 PDX → DEN Jul 15, 20:20 UTCJul 15, 22:50 UTC2h 30m

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 N24573 page for operator, model, and routing details .

Mode-S A245FB frequently asked

What is Mode-S code A245FB?
A245FB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24573.
Where is Mode-S A245FB registered?
Mode-S code A245FB 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 A245FB broadcasting right now?
Yes. Mode-S A245FB is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A245FB, octal 50442773, decimal 10,634,747.
What flights does A245FB operate?
Mode-S A245FB has broadcast 20 distinct callsigns, including UAL2361, UAL1998, UAL1755, UAL8197, UAL792.