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sensors Mode-S transponder

AC537F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N89349 · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AC537F
Octal
53051577
Decimal
11,293,567
Country
US
Tail
N89349
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
585
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AC537F.

Country allocation

The ICAO 24-bit address AC537F 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
ASH6296 - 10 2026-07-02
ASH6201 - 9 2026-07-18
ASH6148 - 9 2026-07-02
ASH6134 Mesa Airlines 7 2026-07-26
ASH6123 - 7 2026-07-10
ASH4017 Mesa Airlines 7 2026-07-21
ASH6353 - 6 2026-07-14
ASH6299 - 6 2026-06-29
ASH6233 Mesa Airlines 6 2026-07-20
ASH6206 - 6 2026-07-19
ASH6188 - 6 2026-07-10
ASH6177 - 6 2026-07-13
ASH4051 Mesa Airlines 6 2026-06-09
ASH4049 Mesa Airlines 6 2026-05-31
ASH4040 Mesa Airlines 6 2026-07-24
ASH6367 Mesa Airlines 5 2026-07-23
ASH6308 Mesa Airlines 5 2026-06-09
ASH6298 Mesa Airlines 5 2026-07-21
ASH6278 - 5 2026-07-18
ASH6266 Mesa Airlines 5 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASH4036 IAH → PHL Jul 26, 21:15 UTCJul 26, 21:45 UTC30m
2026-07-26 ASH6134 IAH → CMH Jul 26, 17:40 UTCJul 26, 20:05 UTC2h 25m
2026-07-26 ASH3994 CHS → IAH Jul 26, 14:25 UTCJul 26, 15:50 UTC1h 25m
2026-07-26 ASH4009 SAT → IAH Jul 26, 01:30 UTCJul 26, 02:35 UTC1h 5m
2026-07-25 ASH4036 IAH → PHL Jul 25, 21:25 UTCJul 25, 23:40 UTC2h 15m
2026-07-25 ASH6134 IAH → CMH Jul 25, 17:40 UTCJul 25, 20:00 UTC2h 20m
2026-07-25 ASH4029 IAD → CLT Jul 25, 13:40 UTCJul 25, 15:40 UTC2h 0m
2026-07-25 ASH6126 IAD → MCI Jul 25, 01:05 UTCJul 25, 02:55 UTC1h 50m
2026-07-24 ASH4038 IAH → TUL Jul 24, 21:15 UTCJul 24, 23:20 UTC2h 5m
2026-07-24 ASH6139 IAH → CVG Jul 24, 17:45 UTCJul 24, 19:40 UTC1h 55m
2026-07-24 ASH6139 IAH → CVG Jul 24, 17:52 UTCJul 24, 19:41 UTC1h 49m
2026-07-24 ASH4042 TUL → IAH Jul 24, 13:45 UTCJul 24, 15:55 UTC2h 10m
2026-07-24 ASH4040 IAH → CRP Jul 24, 01:35 UTCJul 24, 03:35 UTC2h 0m
2026-07-23 ASH4013 IAH → DTW Jul 23, 22:20 UTCJul 23, 23:45 UTC1h 25m
2026-07-23 ASH4013 IAH → DTW Jul 23, 22:26 UTCJul 23, 23:51 UTC1h 25m
2026-07-23 ASH6120 LGA → IAH Jul 23, 19:35 UTCJul 23, 21:00 UTC1h 25m
2026-07-23 ASH6367 IAH → ELP Jul 23, 16:00 UTCJul 23, 18:00 UTC2h 0m
2026-07-23 ASH6312 IAH → CVG Jul 23, 12:35 UTCJul 23, 14:35 UTC2h 0m
2026-07-22 ASH3985 IAD → ATL Jul 22, 19:35 UTCJul 22, 20:20 UTC45m
2026-07-22 ASH4024 BWI → IAH Jul 22, 17:35 UTCJul 22, 18:15 UTC40m
2026-07-22 ASH6255 IAD → IND Jul 22, 14:45 UTCJul 22, 15:45 UTC1h 0m
2026-07-22 ASH6255 IAD → IND Jul 22, 14:54 UTCJul 22, 15:51 UTC57m
2026-07-22 ASH6178 IAD → LGA Jul 22, 12:35 UTCJul 22, 13:30 UTC55m
2026-07-22 ASH6178 IAD → LGA Jul 22, 12:43 UTCJul 22, 13:34 UTC51m
2026-07-21 ASH4032 IAH → DFW Jul 21, 23:15 UTCJul 22, 01:30 UTC2h 15m
2026-07-21 ASH6131 - Jul 21, 19:55 UTCJul 21, 22:20 UTC2h 25m
2026-07-21 ASH6298 IAH → MSY Jul 21, 15:00 UTCJul 21, 16:45 UTC1h 45m
2026-07-21 ASH3234 - Jul 21, 12:10 UTCJul 21, 14:00 UTC1h 50m
2026-07-21 ASH4017 MAF → IAH Jul 21, 00:15 UTCJul 21, 01:25 UTC1h 10m
2026-07-20 ASH6233 MAF → IAH Jul 20, 21:45 UTCJul 20, 22:50 UTC1h 5m
2026-07-20 ASH6233 MAF → IAH Jul 20, 21:54 UTCJul 20, 23:04 UTC1h 10m
2026-07-20 ASH6281 PHX → IAH Jul 20, 19:20 UTCJul 20, 20:05 UTC45m
2026-07-20 ASH6202 LGA → IAH Jul 20, 17:30 UTCJul 20, 18:05 UTC35m
2026-07-20 ASH6202 LGA → IAH Jul 20, 17:30 UTCJul 20, 18:04 UTC34m
2026-07-20 ASH6223 PHX → IAH Jul 20, 13:35 UTCJul 20, 15:25 UTC1h 50m
2026-07-20 ASH4021 IAD → IND Jul 20, 03:00 UTCJul 20, 04:20 UTC1h 20m
2026-07-19 ASH6165 SAV → IAD Jul 19, 23:20 UTCJul 20, 00:55 UTC1h 35m
2026-07-19 ASH6165 SAV → IAD Jul 19, 23:19 UTCJul 20, 00:52 UTC1h 33m
2026-07-19 ASH6355 - Jul 19, 20:10 UTCJul 19, 22:10 UTC2h 0m
2026-07-19 ASH4011 - Jul 19, 17:00 UTCJul 19, 18:10 UTC1h 10m
2026-07-19 ASH6186 - Jul 19, 14:55 UTCJul 19, 16:00 UTC1h 5m
2026-07-19 ASH6298 - Jul 19, 11:30 UTCJul 19, 13:15 UTC1h 45m
2026-07-19 ASH6298 TYS → IAH Jul 19, 11:33 UTCJul 19, 13:15 UTC1h 42m
2026-07-19 ASH6206 - Jul 19, 01:20 UTCJul 19, 03:10 UTC1h 50m
2026-07-19 ASH6206 IAH → TYS Jul 19, 01:21 UTCJul 19, 03:10 UTC1h 49m
2026-07-18 ASH4001 - Jul 18, 22:25 UTCJul 18, 23:35 UTC1h 10m
2026-07-18 ASH4001 MAF → IAH Jul 18, 22:27 UTCJul 18, 23:30 UTC1h 3m
2026-07-18 ASH6322 - Jul 18, 19:55 UTCJul 18, 21:00 UTC1h 5m
2026-07-18 ASH6278 - Jul 18, 17:00 UTCJul 18, 17:35 UTC35m
2026-07-18 ASH6201 - Jul 18, 15:00 UTCJul 18, 15:35 UTC35m

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 N89349 page for operator, model, and routing details .

Mode-S AC537F frequently asked

What is Mode-S code AC537F?
AC537F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N89349.
Where is Mode-S AC537F registered?
Mode-S code AC537F 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 AC537F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC537F, octal 53051577, decimal 11,293,567.
What flights does AC537F operate?
Mode-S AC537F has broadcast 20 distinct callsigns, including ASH6296, ASH6201, ASH6148, ASH6134, ASH6123.