Apparatus

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sensors Mode-S transponder

ABB537

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N85323 · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
ABB537
Octal
52732467
Decimal
11,253,047
Country
US
Tail
N85323
Type
E75L
No current signal · last broadcast Jul 26, 20:10 UTC
Flights observed
365
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Last known position

Most recent position reported by Mode-S ABB537.

Country allocation

The ICAO 24-bit address ABB537 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
ASH4004 Mesa Airlines 7 2026-07-21
ASH6303 Mesa Airlines 6 2026-05-26
ASH6271 Mesa Airlines 6 2026-05-18
ASH4000 Mesa Airlines 6 2026-05-18
ASH6295 Mesa Airlines 5 2026-07-25
ASH6151 Mesa Airlines 5 2026-07-26
ASH4010 Mesa Airlines 5 2026-05-22
ASH3982 Mesa Airlines 5 2026-07-26
ASH6329 Mesa Airlines 4 2026-07-25
ASH6310 Mesa Airlines 4 2026-05-25
ASH6276 Mesa Airlines 4 2026-07-24
ASH6236 Mesa Airlines 4 2026-07-24
ASH6235 Mesa Airlines 4 2026-05-25
ASH6219 Mesa Airlines 4 2026-05-17
ASH6173 Mesa Airlines 4 2026-07-18
ASH6128 Mesa Airlines 4 2026-05-11
ASH4077 Mesa Airlines 4 2026-05-06
ASH4067 Mesa Airlines 4 2026-05-22
ASH4063 - 4 2026-07-14
ASH4055 Mesa Airlines 4 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASH6151 IAH → LGA Jul 26, 18:20 UTCJul 26, 20:10 UTC1h 50m
2026-07-26 ASH3982 BTR → IAH Jul 26, 15:25 UTCJul 26, 17:15 UTC1h 50m
2026-07-26 ASH4051 IAH → MKE Jul 26, 11:40 UTCJul 26, 13:00 UTC1h 20m
2026-07-26 ASH6308 IAH → XNA Jul 26, 01:35 UTCJul 26, 02:45 UTC1h 10m
2026-07-25 ASH6329 IAH → ELP Jul 25, 21:25 UTCJul 25, 23:30 UTC2h 5m
2026-07-25 ASH6329 IAH → ELP Jul 25, 21:17 UTCJul 25, 23:31 UTC2h 14m
2026-07-25 ASH6295 TUL → IAH Jul 25, 17:50 UTCJul 25, 19:50 UTC2h 0m
2026-07-25 ASH6295 TUL → IAH Jul 25, 17:37 UTCJul 25, 19:48 UTC2h 11m
2026-07-24 ASH4001 IAH → BTR Jul 24, 22:50 UTCJul 24, 23:45 UTC55m
2026-07-24 ASH6322 IAH → MAF Jul 24, 19:55 UTCJul 24, 20:55 UTC1h 0m
2026-07-24 ASH6236 IAD → LGA Jul 24, 16:20 UTCJul 24, 18:25 UTC2h 5m
2026-07-24 ASH3988 IAD → SAV Jul 24, 12:45 UTCJul 24, 14:50 UTC2h 5m
2026-07-24 ASH6351 MAF → IAH Jul 24, 10:15 UTCJul 24, 11:20 UTC1h 5m
2026-07-24 ASH6276 IAD → CMH Jul 24, 03:20 UTCJul 24, 04:25 UTC1h 5m
2026-07-24 ASH3996 IAH → MCI Jul 24, 00:10 UTCJul 24, 01:15 UTC1h 5m
2026-07-23 ASH6334 IAH → OKC Jul 23, 21:45 UTCJul 23, 22:50 UTC1h 5m
2026-07-23 ASH6334 IAH → OKC Jul 23, 21:54 UTCJul 23, 22:47 UTC53m
2026-07-23 ASH4030 - Jul 23, 18:20 UTCJul 23, 20:10 UTC1h 50m
2026-07-23 ASH6122 - Jul 23, 15:10 UTCJul 23, 17:05 UTC1h 55m
2026-07-23 ASH4051 IAH → MKE Jul 23, 12:25 UTCJul 23, 13:40 UTC1h 15m
2026-07-23 ASH6308 IAH → XNA Jul 23, 02:05 UTCJul 23, 03:05 UTC1h 0m
2026-07-22 ASH6329 IAH → ELP Jul 22, 21:10 UTCJul 22, 23:15 UTC2h 5m
2026-07-22 ASH6295 TUL → IAH Jul 22, 17:55 UTCJul 22, 19:55 UTC2h 0m
2026-07-22 ASH6295 TUL → IAH Jul 22, 17:37 UTCJul 22, 19:52 UTC2h 15m
2026-07-22 ASH4066 IAD → LGA Jul 22, 14:55 UTCJul 22, 15:50 UTC55m
2026-07-21 ASH6150 BOS → IAD Jul 21, 23:40 UTCJul 22, 00:35 UTC55m
2026-07-21 ASH6150 BOS → IAD Jul 21, 23:42 UTCJul 22, 00:38 UTC56m
2026-07-21 ASH4004 SDF → IAD Jul 21, 21:40 UTCJul 21, 22:15 UTC35m
2026-07-21 ASH6118 COS → IAH Jul 21, 19:35 UTCJul 21, 20:05 UTC30m
2026-07-21 ASH6367 IAH → ELP Jul 21, 16:10 UTCJul 21, 18:05 UTC1h 55m
2026-07-21 ASH6312 IAH → CVG Jul 21, 12:40 UTCJul 21, 14:40 UTC2h 0m
2026-07-20 ASH4038 - Jul 20, 21:20 UTCJul 20, 23:05 UTC1h 45m
2026-07-20 ASH6139 IAH → CVG Jul 20, 17:50 UTCJul 20, 19:45 UTC1h 55m
2026-07-20 ASH6139 IAH → CVG Jul 20, 17:52 UTCJul 20, 19:45 UTC1h 53m
2026-07-20 ASH4066 IAD → LGA Jul 20, 14:55 UTCJul 20, 15:55 UTC1h 0m
2026-07-19 ASH6150 - Jul 19, 23:35 UTCJul 20, 00:25 UTC50m
2026-07-19 ASH4004 SDF → IAD Jul 19, 21:25 UTCJul 19, 21:58 UTC33m
2026-07-19 ASH4004 SDF → IAD Jul 19, 21:25 UTCJul 19, 22:00 UTC35m
2026-07-19 ASH6118 COS → IAH Jul 19, 19:35 UTCJul 19, 19:45 UTC10m
2026-07-19 ASH6118 COS → IAH Jul 19, 19:39 UTCJul 19, 20:04 UTC25m
2026-07-19 ASH6236 IAD → LGA Jul 19, 16:10 UTCJul 19, 18:15 UTC2h 5m
2026-07-19 ASH6236 IAD → LGA Jul 19, 16:13 UTCJul 19, 18:10 UTC1h 57m
2026-07-19 ASH3988 - Jul 19, 12:55 UTCJul 19, 13:45 UTC50m
2026-07-19 ASH3988 IAH → CLT Jul 19, 12:53 UTCJul 19, 15:03 UTC2h 10m
2026-07-19 ASH4019 BHM → IAH Jul 19, 10:10 UTCJul 19, 11:00 UTC50m
2026-07-19 ASH6248 - Jul 19, 02:50 UTCJul 19, 03:40 UTC50m
2026-07-19 ASH6273 - Jul 19, 00:20 UTCJul 19, 01:10 UTC50m
2026-07-19 ASH6273 MSY → IAH Jul 19, 00:28 UTCJul 19, 01:05 UTC37m
2026-07-18 ASH6173 BDL → IAD Jul 18, 22:15 UTCJul 18, 23:05 UTC50m
2026-07-18 ASH6367 - Jul 18, 16:00 UTCJul 18, 17:55 UTC1h 55m

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 N85323 page for operator, model, and routing details .

Mode-S ABB537 frequently asked

What is Mode-S code ABB537?
ABB537 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N85323.
Where is Mode-S ABB537 registered?
Mode-S code ABB537 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 ABB537 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABB537, octal 52732467, decimal 11,253,047.
What flights does ABB537 operate?
Mode-S ABB537 has broadcast 20 distinct callsigns, including ASH4004, ASH6303, ASH6271, ASH4000, ASH6295.