Apparatus

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sensors Mode-S transponder

A24C73

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24702 · BOEING 737-700 · operated by UNITED AIRLINES INC

Hex
A24C73
Octal
50446163
Decimal
10,636,403
Country
US
Tail
N24702
Type
B737
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
226
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A24C73.

Country allocation

The ICAO 24-bit address A24C73 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
UAL1905 United Airlines 8 2026-06-18
UAL1288 - 8 2026-07-11
UAL378 United Airlines 7 2026-07-17
UAL2747 United Airlines 6 2026-04-17
UAL2243 - 6 2026-07-11
UAL382 - 5 2026-07-19
UAL374 United Airlines 5 2026-07-19
UAL1746 - 5 2026-07-11
UAL780 United Airlines 4 2026-07-25
UAL752 - 4 2026-07-12
UAL471 United Airlines 4 2026-07-25
UAL449 United Airlines 4 2026-06-13
UAL2860 - 4 2026-07-11
UAL2684 United Airlines 4 2026-07-21
UAL1888 - 4 2026-07-17
UAL1862 - 4 2026-07-20
UAL768 - 3 2026-07-20
UAL654 - 3 2026-07-12
UAL541 United Airlines 3 2026-06-13
UAL358 United Airlines 3 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1869 SFO → IAD Jul 26, 22:10 UTCJul 26, 22:45 UTC35m
2026-07-26 UAL2607 DFW → EWR Jul 26, 19:30 UTCJul 26, 20:05 UTC35m
2026-07-26 UAL2066 ORD → PHL Jul 26, 17:20 UTCJul 26, 17:55 UTC35m
2026-07-26 UAL2639 IAD → BDL Jul 26, 12:35 UTCJul 26, 15:15 UTC2h 40m
2026-07-25 UAL2116 IAH → SFO Jul 25, 22:30 UTCJul 26, 01:10 UTC2h 40m
2026-07-25 UAL780 IAD → LAS Jul 25, 19:10 UTCJul 25, 20:05 UTC55m
2026-07-25 UAL780 IAD → LAS Jul 25, 19:12 UTCJul 25, 20:01 UTC49m
2026-07-25 UAL1709 EWR → MCO Jul 25, 17:00 UTCJul 25, 17:55 UTC55m
2026-07-25 UAL471 IAD → BOS Jul 25, 12:20 UTCJul 25, 15:25 UTC3h 5m
2026-07-24 UAL1869 SFO → IAD Jul 24, 23:05 UTCJul 25, 02:00 UTC2h 55m
2026-07-24 UAL2264 DEN → MCO Jul 24, 15:30 UTCJul 24, 19:10 UTC3h 40m
2026-07-23 UAL2410 MSY → SFO Jul 23, 22:40 UTCJul 24, 02:55 UTC4h 15m
2026-07-23 UAL780 IAD → LAS Jul 23, 19:30 UTCJul 23, 20:20 UTC50m
2026-07-23 UAL1709 EWR → MCO Jul 23, 17:25 UTCJul 23, 18:15 UTC50m
2026-07-23 UAL204 BOS → IAD Jul 23, 12:35 UTCJul 23, 15:50 UTC3h 15m
2026-07-22 UAL1822 SAN → ORD Jul 22, 22:40 UTCJul 23, 02:10 UTC3h 30m
2026-07-22 UAL358 SFO → LAS Jul 22, 17:50 UTCJul 22, 20:20 UTC2h 30m
2026-07-22 UAL528 ORD → DFW Jul 22, 14:05 UTCJul 22, 15:55 UTC1h 50m
2026-07-21 UAL2684 PHL → ORD Jul 21, 10:40 UTCJul 21, 12:30 UTC1h 50m
2026-07-21 UAL1557 OGG → SFO Jul 21, 01:00 UTCJul 21, 02:15 UTC1h 15m
2026-07-20 UAL1989 - Jul 20, 21:05 UTCJul 20, 22:00 UTC55m
2026-07-20 UAL1781 EWR → CHS Jul 20, 18:50 UTCJul 20, 19:45 UTC55m
2026-07-20 UAL1862 - Jul 20, 13:25 UTCJul 20, 17:05 UTC3h 40m
2026-07-20 UAL768 - Jul 20, 01:35 UTCJul 20, 05:10 UTC3h 35m
2026-07-19 UAL1884 EWR → RSW Jul 19, 22:55 UTCJul 20, 00:15 UTC1h 20m
2026-07-19 UAL1928 IAH → MSY Jul 19, 20:20 UTCJul 19, 21:15 UTC55m
2026-07-19 UAL374 EWR → PBI Jul 19, 17:20 UTCJul 19, 19:00 UTC1h 40m
2026-07-19 UAL382 ORD → DCA Jul 19, 14:55 UTCJul 19, 16:10 UTC1h 15m
2026-07-19 UAL2072 EWR → ATL Jul 19, 01:50 UTCJul 19, 04:25 UTC2h 35m
2026-07-18 UAL1955 ORD → SLC Jul 18, 18:35 UTCJul 18, 21:30 UTC2h 55m
2026-07-17 UAL378 ORD → EWR Jul 17, 23:14 UTCJul 18, 17:10 UTC17h 56m
2026-07-17 UAL1888 DCA → ORD Jul 17, 19:49 UTCJul 17, 21:50 UTC2h 0m
2026-07-17 UAL1888 DCA → ORD Jul 17, 19:22 UTCJul 17, 21:37 UTC2h 15m
2026-07-17 UAL1381 - Jul 17, 15:44 UTCJul 17, 17:15 UTC1h 30m
2026-07-17 UAL2638 DCA → ORD Jul 17, 11:39 UTCJul 17, 13:05 UTC1h 25m
2026-07-17 UAL8150 ORD → DCA Jul 17, 01:59 UTCJul 17, 03:30 UTC1h 30m
2026-07-16 UAL2059 ROC → ORD Jul 16, 22:06 UTCJul 16, 23:46 UTC1h 40m
2026-07-16 UAL2059 - Jul 16, 22:25 UTCJul 17, 00:04 UTC1h 40m
2026-07-16 UAL8139 ORD → ROC Jul 16, 19:20 UTCJul 16, 20:29 UTC1h 10m
2026-07-16 UAL374 DCA → ORD Jul 16, 16:25 UTCJul 16, 18:10 UTC1h 45m
2026-07-16 UAL382 - Jul 16, 13:34 UTCJul 16, 15:05 UTC1h 30m
2026-07-16 UAL2684 - Jul 16, 10:45 UTCJul 16, 12:25 UTC1h 40m
2026-07-16 UAL1557 - Jul 16, 02:50 UTCJul 16, 04:05 UTC1h 15m
2026-07-15 UAL2357 - Jul 15, 14:35 UTCJul 15, 23:50 UTC9h 15m
2026-07-15 UAL1793 DCA → ORD Jul 15, 10:40 UTCJul 15, 12:05 UTC1h 25m
2026-07-15 UAL456 ORD → DCA Jul 15, 00:55 UTCJul 15, 02:20 UTC1h 25m
2026-07-14 UAL456 AUS → ORD Jul 14, 18:20 UTCJul 14, 20:35 UTC2h 15m
2026-07-14 UAL1688 ORD → AUS Jul 14, 14:38 UTCJul 14, 17:21 UTC2h 43m
2026-07-14 UAL1688 ORD → AUS Jul 14, 14:30 UTCJul 14, 17:25 UTC2h 55m
2026-07-14 UAL2684 - Jul 14, 10:35 UTCJul 14, 12:00 UTC1h 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 N24702 page for operator, model, and routing details .

Mode-S A24C73 frequently asked

What is Mode-S code A24C73?
A24C73 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24702.
Where is Mode-S A24C73 registered?
Mode-S code A24C73 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 A24C73 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A24C73, octal 50446163, decimal 10,636,403.
What flights does A24C73 operate?
Mode-S A24C73 has broadcast 20 distinct callsigns, including UAL1905, UAL1288, UAL378, UAL2747, UAL2243.