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sensors Mode-S transponder

AC045C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N87337 · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AC045C
Octal
53002134
Decimal
11,273,308
Country
US
Tail
N87337
Type
E75L
No current signal · last broadcast 13h ago
Flights observed
463
Distinct callsigns
20
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S AC045C.

Country allocation

The ICAO 24-bit address AC045C 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
ASH6173 Mesa Airlines 8 2026-06-18
ASH4011 - 8 2026-07-10
ASH6126 - 7 2026-06-18
ASH4013 - 7 2026-07-10
ASH4008 - 7 2026-07-12
ASH4001 - 7 2026-07-01
ASH6322 - 6 2026-07-06
ASH6186 - 6 2026-07-10
ASH4033 - 6 2026-07-02
ASH6258 Mesa Airlines 5 2026-05-25
ASH6254 - 5 2026-06-29
ASH6203 Mesa Airlines 5 2026-05-29
ASH4063 Mesa Airlines 5 2026-05-29
ASH4036 Mesa Airlines 5 2026-06-16
ASH3997 - 5 2026-07-05
ASH3981 Mesa Airlines 5 2026-05-29
ASH6366 - 4 2026-07-03
ASH6239 Mesa Airlines 4 2026-05-29
ASH6202 Mesa Airlines 4 2026-06-23
ASH6200 Mesa Airlines 4 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASH3236 - Jul 13, 12:45 UTCJul 13, 13:45 UTC1h 0m
2026-07-13 ASH3236 IAH → OKC Jul 13, 12:40 UTCJul 13, 13:40 UTC1h 0m
2026-07-12 ASH4008 - Jul 12, 11:40 UTCJul 12, 13:01 UTC1h 20m
2026-07-11 ASH6120 - Jul 11, 21:35 UTCJul 11, 22:55 UTC1h 20m
2026-07-11 ASH6299 - Jul 11, 16:25 UTCJul 11, 18:20 UTC1h 55m
2026-07-11 ASH6299 TYS → IAH Jul 11, 16:23 UTCJul 11, 18:18 UTC1h 55m
2026-07-11 ASH6115 - Jul 11, 13:20 UTCJul 11, 15:10 UTC1h 50m
2026-07-10 ASH4013 - Jul 10, 22:20 UTCJul 10, 23:50 UTC1h 30m
2026-07-10 ASH4013 BHM → IAH Jul 10, 22:26 UTCJul 10, 23:44 UTC1h 18m
2026-07-10 ASH6120 - Jul 10, 19:45 UTCJul 10, 21:05 UTC1h 21m
2026-07-10 ASH4011 - Jul 10, 17:05 UTCJul 10, 18:25 UTC1h 20m
2026-07-10 ASH4011 MAF → IAH Jul 10, 17:11 UTCJul 10, 18:15 UTC1h 4m
2026-07-10 ASH6186 - Jul 10, 14:45 UTCJul 10, 15:45 UTC1h 0m
2026-07-10 ASH6186 IAH → MAF Jul 10, 14:55 UTCJul 10, 15:46 UTC51m
2026-07-10 ASH4008 - Jul 10, 11:40 UTCJul 10, 13:00 UTC1h 20m
2026-07-10 ASH4022 - Jul 10, 01:10 UTCJul 10, 02:35 UTC1h 25m
2026-07-09 ASH6290 - Jul 9, 22:30 UTCJul 9, 23:45 UTC1h 15m
2026-07-09 ASH4062 - Jul 9, 19:45 UTCJul 9, 20:55 UTC1h 10m
2026-07-09 ASH4011 - Jul 9, 17:10 UTCJul 9, 18:20 UTC1h 10m
2026-07-09 ASH4011 MAF → IAH Jul 9, 17:11 UTCJul 9, 18:12 UTC1h 1m
2026-07-09 ASH6186 - Jul 9, 15:00 UTCJul 9, 16:00 UTC1h 0m
2026-07-09 ASH6186 IAH → MAF Jul 9, 15:00 UTCJul 9, 16:00 UTC1h 0m
2026-07-09 ASH4051 - Jul 9, 12:25 UTCJul 9, 13:35 UTC1h 10m
2026-07-09 ASH6308 - Jul 9, 01:40 UTCJul 9, 02:50 UTC1h 10m
2026-07-08 ASH4013 - Jul 8, 22:20 UTCJul 8, 23:40 UTC1h 20m
2026-07-08 ASH6120 - Jul 8, 19:50 UTCJul 8, 21:10 UTC1h 20m
2026-07-08 ASH6260 - Jul 8, 16:25 UTCJul 8, 17:30 UTC1h 5m
2026-07-08 ASH6263 - Jul 8, 12:25 UTCJul 8, 13:25 UTC1h 0m
2026-07-08 ASH4017 MAF → IAH Jul 8, 00:30 UTCJul 8, 01:35 UTC1h 5m
2026-07-07 ASH6233 - Jul 7, 22:15 UTCJul 7, 23:20 UTC1h 5m
2026-07-07 ASH6296 - Jul 7, 17:20 UTCJul 7, 19:50 UTC2h 30m
2026-07-07 ASH6296 RDU → IAH Jul 7, 17:27 UTCJul 7, 19:50 UTC2h 23m
2026-07-07 ASH6148 - Jul 7, 13:30 UTCJul 7, 15:55 UTC2h 25m
2026-07-07 ASH4031 - Jul 7, 11:35 UTCJul 7, 12:15 UTC40m
2026-07-07 ASH6138 - Jul 7, 01:15 UTCJul 7, 01:50 UTC35m
2026-07-07 ASH6138 IAH → CRP Jul 7, 01:08 UTCJul 7, 01:54 UTC46m
2026-07-06 ASH6322 - Jul 6, 19:55 UTCJul 6, 23:25 UTC3h 30m
2026-07-06 ASH6251 - Jul 6, 15:50 UTCJul 6, 18:30 UTC2h 40m
2026-07-06 ASH6137 - Jul 6, 13:45 UTCJul 6, 14:55 UTC1h 10m
2026-07-06 ASH4058 - Jul 6, 10:25 UTCJul 6, 11:30 UTC1h 5m
2026-07-06 ASH3995 IAD → DTW Jul 6, 04:33 UTCJul 6, 05:35 UTC1h 2m
2026-07-05 ASH6144 AUS → IAD Jul 5, 22:10 UTCJul 6, 01:15 UTC3h 5m
2026-07-05 ASH4068 IAD → AUS Jul 5, 17:35 UTCJul 5, 20:25 UTC2h 50m
2026-07-05 ASH3997 IND → IAD Jul 5, 15:30 UTCJul 5, 16:40 UTC1h 10m
2026-07-05 ASH4021 IAD → IND Jul 5, 13:20 UTCJul 5, 14:35 UTC1h 15m
2026-07-04 ASH6144 AUS → IAD Jul 4, 22:10 UTCJul 5, 01:15 UTC3h 5m
2026-07-04 ASH4068 IAD → AUS Jul 4, 17:25 UTCJul 4, 20:20 UTC2h 55m
2026-07-04 ASH4044 - Jul 4, 14:05 UTCJul 4, 15:15 UTC1h 10m
2026-07-03 ASH4016 - Jul 3, 22:55 UTCJul 4, 00:15 UTC1h 20m
2026-07-03 ASH6159 SDF → IAH Jul 3, 18:55 UTCJul 3, 20:10 UTC1h 15m

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 N87337 page for operator, model, and routing details .

Mode-S AC045C frequently asked

What is Mode-S code AC045C?
AC045C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N87337.
Where is Mode-S AC045C registered?
Mode-S code AC045C 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 AC045C broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC045C, octal 53002134, decimal 11,273,308.
What flights does AC045C operate?
Mode-S AC045C has broadcast 20 distinct callsigns, including ASH6173, ASH4011, ASH6126, ASH4013, ASH4008.