Apparatus

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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
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
624
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A23675.

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 CommutAir 13 2026-07-26
UCA4288 - 9 2026-07-15
UCA4237 CommutAir 9 2026-07-26
UCA4825 - 7 2026-07-09
UCA4329 - 7 2026-07-01
UCA4229 - 7 2026-07-18
UCA4905 CommutAir 6 2026-06-06
UCA4870 - 6 2026-06-26
UCA4845 CommutAir 6 2026-06-10
UCA4838 CommutAir 6 2026-07-24
UCA4828 - 6 2026-07-09
UCA4813 CommutAir 6 2026-07-01
UCA4362 - 6 2026-07-16
UCA4344 CommutAir 6 2026-06-26
UCA4326 - 6 2026-07-10
UCA4304 - 6 2026-07-15
UCA4945 - 5 2026-07-14
UCA4929 CommutAir 5 2026-07-22
UCA4901 - 5 2026-07-19
UCA4892 CommutAir 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4902 IAD → PHL Jul 26, 20:15 UTCJul 26, 21:15 UTC1h 0m
2026-07-26 UCA4237 IAH → MFE Jul 26, 18:00 UTCJul 26, 19:01 UTC1h 1m
2026-07-26 UCA4350 PWM → IAD Jul 26, 16:15 UTCJul 26, 17:00 UTC45m
2026-07-26 UCA4350 PWM → IAD Jul 26, 16:17 UTCJul 26, 16:59 UTC42m
2026-07-26 UCA4917 IAH → LRD Jul 26, 13:45 UTCJul 26, 15:05 UTC1h 20m
2026-07-26 UCA4987 IAH → ICT Jul 26, 01:35 UTCJul 26, 02:55 UTC1h 20m
2026-07-25 UCA4303 PNS → IAH Jul 25, 22:05 UTCJul 25, 23:15 UTC1h 10m
2026-07-25 UCA4869 IAD → BTV Jul 25, 19:35 UTCJul 25, 20:45 UTC1h 10m
2026-07-25 UCA4869 IAD → BTV Jul 25, 19:39 UTCJul 25, 20:47 UTC1h 8m
2026-07-25 UCA4830 LIT → IAH Jul 25, 17:15 UTCJul 25, 18:15 UTC1h 0m
2026-07-25 UCA4830 LIT → IAH Jul 25, 17:13 UTCJul 25, 18:23 UTC1h 10m
2026-07-25 UCA4371 IAD → BDL Jul 25, 14:55 UTCJul 25, 15:40 UTC45m
2026-07-25 UCA4852 SGF → IAH Jul 25, 11:50 UTCJul 25, 13:20 UTC1h 30m
2026-07-24 UCA4867 TUL → IAH Jul 24, 22:15 UTCJul 24, 23:25 UTC1h 10m
2026-07-24 UCA4838 IAH → ELP Jul 24, 19:55 UTCJul 24, 20:55 UTC1h 0m
2026-07-24 UCA4301 ICT → IAH Jul 24, 17:55 UTCJul 24, 19:00 UTC1h 5m
2026-07-24 UCA4357 LRD → IAH Jul 24, 14:50 UTCJul 24, 15:45 UTC55m
2026-07-24 UCA4892 IAH → LRD Jul 24, 03:10 UTCJul 24, 03:55 UTC45m
2026-07-24 UCA4892 IAH → LRD Jul 24, 02:57 UTCJul 24, 03:56 UTC59m
2026-07-23 UCA4357 LRD → IAH Jul 23, 15:15 UTCJul 23, 16:10 UTC55m
2026-07-23 UCA4285 IAH → MFE Jul 23, 00:15 UTCJul 23, 01:05 UTC50m
2026-07-22 UCA4365 IAD → BDL Jul 22, 22:00 UTCJul 22, 23:00 UTC1h 0m
2026-07-22 UCA4929 LBB → IAH Jul 22, 19:50 UTCJul 22, 20:35 UTC45m
2026-07-22 UCA4338 IAD → CMH Jul 22, 17:20 UTCJul 22, 18:35 UTC1h 15m
2026-07-22 UCA4297 IAD → PVD Jul 22, 14:50 UTCJul 22, 16:00 UTC1h 10m
2026-07-22 UCA4226 LRD → IAH Jul 22, 12:25 UTCJul 22, 13:30 UTC1h 5m
2026-07-22 UCA4226 LRD → IAH Jul 22, 12:33 UTCJul 22, 13:20 UTC47m
2026-07-22 UCA4892 IAH → LRD Jul 22, 03:05 UTCJul 22, 03:55 UTC50m
2026-07-21 UCA4376 IAD → BTV Jul 21, 14:55 UTCJul 21, 15:55 UTC1h 0m
2026-07-21 UCA4355 IAD → PVD Jul 21, 13:00 UTCJul 21, 13:55 UTC55m
2026-07-21 UCA4248 HRL → IAH Jul 21, 10:45 UTCJul 21, 11:40 UTC55m
2026-07-21 UCA4919 - Jul 21, 01:45 UTCJul 21, 02:35 UTC50m
2026-07-21 UCA4919 IAH → HRL Jul 21, 01:53 UTCJul 21, 02:31 UTC38m
2026-07-20 UCA4348 - Jul 20, 22:30 UTCJul 20, 23:10 UTC40m
2026-07-20 UCA4814 PVD → IAD Jul 20, 20:20 UTCJul 20, 21:05 UTC45m
2026-07-20 UCA4237 IAH → MFE Jul 20, 17:15 UTCJul 20, 18:00 UTC45m
2026-07-20 UCA4237 IAH → MFE Jul 20, 17:25 UTCJul 20, 18:18 UTC53m
2026-07-20 UCA4350 PWM → IAD Jul 20, 15:15 UTCJul 20, 15:55 UTC40m
2026-07-20 UCA4350 PWM → IAD Jul 20, 15:27 UTCJul 20, 15:57 UTC30m
2026-07-20 UCA4318 - Jul 20, 12:30 UTCJul 20, 13:20 UTC50m
2026-07-20 UCA4334 IAH → JAN Jul 20, 00:02 UTCJul 20, 00:54 UTC52m
2026-07-19 UCA4334 - Jul 19, 23:55 UTCJul 20, 00:35 UTC40m
2026-07-19 UCA4379 - Jul 19, 21:40 UTCJul 19, 22:30 UTC50m
2026-07-19 UCA4366 - Jul 19, 19:45 UTCJul 19, 20:30 UTC45m
2026-07-19 UCA4237 IAH → MFE Jul 19, 17:20 UTCJul 19, 18:05 UTC45m
2026-07-19 UCA4237 IAH → MFE Jul 19, 17:25 UTCJul 19, 18:01 UTC36m
2026-07-19 UCA4350 PWM → IAD Jul 19, 15:20 UTCJul 19, 16:05 UTC45m
2026-07-19 UCA4299 HSV → IAH Jul 19, 11:55 UTCJul 19, 13:20 UTC1h 25m
2026-07-19 UCA4901 - Jul 19, 02:40 UTCJul 19, 04:05 UTC1h 25m
2026-07-19 UCA4810 ORF → IAD Jul 19, 00:45 UTCJul 19, 01:25 UTC40m

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?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
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, UCA4288, UCA4237, UCA4825, UCA4329.