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sensors Mode-S transponder

A23675

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24128 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A23675
Octal
50433165
Decimal
10,630,773
Country
US
Tail
N24128
Type
E45X
Broadcasting now · callsign UCA4945 · 16,950 ft
Flights observed
538
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A23675 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A23675 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
UCA4350 - 8 2026-07-13
UCA4825 - 7 2026-07-09
UCA4329 - 7 2026-07-01
UCA4288 CommutAir 7 2026-06-14
UCA4905 CommutAir 6 2026-06-06
UCA4870 - 6 2026-06-26
UCA4845 CommutAir 6 2026-06-10
UCA4828 - 6 2026-07-09
UCA4813 CommutAir 6 2026-07-01
UCA4344 CommutAir 6 2026-06-26
UCA4326 - 6 2026-07-10
UCA4838 CommutAir 5 2026-06-19
UCA4343 CommutAir 5 2026-05-21
UCA4304 CommutAir 5 2026-06-01
UCA4264 - 5 2026-07-09
UCA4238 CommutAir 5 2026-06-01
UCA4232 - 5 2026-07-13
UCA5004 - 4 2026-07-09
UCA4986 - 4 2026-07-14
UCA4974 - 4 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UCA4925 - Jul 14, 18:50 UTCJul 14, 20:00 UTC1h 10m
2026-07-14 UCA4930 IAD → MHT Jul 14, 16:35 UTCJul 14, 17:45 UTC1h 10m
2026-07-14 UCA4974 - Jul 14, 14:35 UTCJul 14, 15:00 UTC25m
2026-07-14 UCA4986 - Jul 14, 12:55 UTCJul 14, 13:20 UTC25m
2026-07-13 UCA4351 HSV → IAD Jul 13, 23:55 UTCJul 14, 01:25 UTC1h 30m
2026-07-13 UCA4946 - Jul 13, 21:15 UTCJul 13, 22:55 UTC1h 40m
2026-07-13 UCA4237 - Jul 13, 19:20 UTCJul 13, 20:20 UTC1h 0m
2026-07-13 UCA4350 - Jul 13, 15:35 UTCJul 13, 16:25 UTC50m
2026-07-13 UCA4232 - Jul 13, 12:35 UTCJul 13, 13:25 UTC50m
2026-07-13 UCA4232 HRL → IAH Jul 13, 12:31 UTCJul 13, 13:26 UTC55m
2026-07-13 UCA4919 - Jul 13, 01:50 UTCJul 13, 02:30 UTC40m
2026-07-12 UCA4246 - Jul 12, 22:25 UTCJul 12, 23:25 UTC1h 0m
2026-07-12 UCA4273 - Jul 12, 19:55 UTCJul 12, 20:50 UTC55m
2026-07-12 UCA4378 - Jul 12, 17:20 UTCJul 12, 18:40 UTC1h 20m
2026-07-12 UCA4358 - Jul 12, 15:01 UTCJul 12, 16:20 UTC1h 20m
2026-07-12 UCA4226 - Jul 12, 12:35 UTCJul 12, 13:30 UTC55m
2026-07-12 UCA4285 - Jul 12, 00:01 UTCJul 12, 00:55 UTC55m
2026-07-11 UCA4365 - Jul 11, 21:55 UTCJul 11, 22:50 UTC55m
2026-07-11 UCA4365 BRO → IAH Jul 11, 22:03 UTCJul 11, 22:46 UTC43m
2026-07-11 UCA4929 - Jul 11, 19:45 UTCJul 11, 20:30 UTC45m
2026-07-11 UCA4878 - Jul 11, 16:15 UTCJul 11, 17:20 UTC1h 5m
2026-07-10 UCA4323 - Jul 10, 22:00 UTCJul 10, 22:55 UTC55m
2026-07-10 UCA4326 - Jul 10, 19:35 UTCJul 10, 20:25 UTC50m
2026-07-10 UCA4336 - Jul 10, 17:55 UTCJul 10, 18:45 UTC50m
2026-07-10 UCA4336 IAH → BTR Jul 10, 17:32 UTCJul 10, 18:46 UTC1h 14m
2026-07-10 UCA4373 - Jul 10, 14:40 UTCJul 10, 15:45 UTC1h 5m
2026-07-09 UCA5004 - Jul 9, 23:30 UTCJul 10, 00:20 UTC50m
2026-07-09 UCA5004 IAH → GPT Jul 9, 23:42 UTCJul 10, 00:35 UTC53m
2026-07-09 UCA4377 - Jul 9, 21:10 UTCJul 9, 21:50 UTC40m
2026-07-09 UCA4825 - Jul 9, 19:35 UTCJul 9, 20:20 UTC45m
2026-07-09 UCA4245 - Jul 9, 17:20 UTCJul 9, 18:05 UTC45m
2026-07-09 UCA4347 - Jul 9, 15:10 UTCJul 9, 15:50 UTC40m
2026-07-09 UCA4264 - Jul 9, 12:40 UTCJul 9, 13:30 UTC50m
2026-07-09 UCA4828 - Jul 9, 02:50 UTCJul 9, 03:30 UTC40m
2026-07-09 UCA4828 IAH → BTR Jul 9, 02:56 UTCJul 9, 03:31 UTC35m
2026-07-08 UCA4339 - Jul 8, 20:50 UTCJul 9, 01:05 UTC4h 15m
2026-07-07 UCA4301 - Jul 7, 12:20 UTCJul 7, 13:15 UTC55m
2026-07-07 UCA4296 - Jul 7, 01:30 UTCJul 7, 02:30 UTC1h 0m
2026-07-07 UCA4296 IAH → LIT Jul 7, 01:28 UTCJul 7, 02:39 UTC1h 11m
2026-07-06 UCA4303 - Jul 6, 22:00 UTCJul 6, 23:20 UTC1h 20m
2026-07-06 UCA4869 - Jul 6, 19:50 UTCJul 6, 20:55 UTC1h 5m
2026-07-06 UCA4300 - Jul 6, 17:20 UTCJul 6, 18:20 UTC1h 0m
2026-07-06 UCA4300 LBB → IAH Jul 6, 17:09 UTCJul 6, 18:20 UTC1h 11m
2026-07-06 UCA4261 - Jul 6, 14:55 UTCJul 6, 15:45 UTC50m
2026-07-06 UCA4301 - Jul 6, 12:35 UTCJul 6, 13:30 UTC55m
2026-07-06 UCA4296 - Jul 6, 02:55 UTCJul 6, 03:50 UTC55m
2026-07-06 UCA4339 - Jul 6, 00:15 UTCJul 6, 01:35 UTC1h 20m
2026-07-05 UCA4275 - Jul 5, 19:35 UTCJul 5, 20:25 UTC50m
2026-07-05 UCA4275 IAH → ELP Jul 5, 19:39 UTCJul 5, 21:06 UTC1h 27m
2026-07-05 UCA4822 - Jul 5, 16:30 UTCJul 5, 17:50 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 N24128 page for operator, model, and routing details .

Mode-S A23675 frequently asked

What is Mode-S code A23675?
A23675 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24128.
Where is Mode-S A23675 registered?
Mode-S code A23675 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 A23675 broadcasting right now?
Yes. Mode-S A23675 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23675, octal 50433165, decimal 10,630,773.
What flights does A23675 operate?
Mode-S A23675 has broadcast 20 distinct callsigns, including UCA4350, UCA4825, UCA4329, UCA4288, UCA4905.