Apparatus

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sensors Mode-S transponder

AC157D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N878QS · operated by AIR CBA LLC, AMGP LLC, ARROW EXTERMINATORS INC, COSTELLO CAPITAL LLC, DISCOVERY COMMUNICATIONS LLC, GA TRAVEL LLC

Hex
AC157D
Octal
53012575
Decimal
11,277,693
Country
US
Tail
N878QS
Type
C700
No current signal · last broadcast 5h ago
Flights observed
202
Distinct callsigns
2
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S AC157D.

Country allocation

The ICAO 24-bit address AC157D 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 2 distinct

Callsign Airline Flights Last seen
EJA878 - 183 2026-07-14
N878QS - 19 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 EJA878 - Jul 14, 22:20 UTCJul 14, 22:55 UTC34m
2026-07-14 N878QS - Jul 14, 17:10 UTCJul 14, 21:15 UTC4h 5m
2026-07-13 N878QS - Jul 13, 17:10 UTCJul 13, 23:05 UTC5h 55m
2026-07-13 EJA878 - Jul 13, 14:25 UTCJul 13, 15:10 UTC45m
2026-07-12 EJA878 - Jul 12, 22:35 UTCJul 13, 00:01 UTC1h 25m
2026-07-12 EJA878 - Jul 12, 20:40 UTCJul 12, 21:15 UTC35m
2026-07-12 EJA878 - Jul 12, 18:01 UTCJul 12, 18:45 UTC45m
2026-07-12 EJA878 - Jul 12, 15:30 UTCJul 12, 16:15 UTC45m
2026-07-12 EJA878 - Jul 12, 13:05 UTCJul 12, 13:55 UTC50m
2026-07-10 EJA878 - Jul 10, 18:35 UTCJul 10, 19:15 UTC40m
2026-06-28 EJA878 DAL → SBA Jun 28, 21:50 UTCJun 28, 22:55 UTC1h 5m
2026-06-28 EJA878 DAL → SBA Jun 28, 17:00 UTCJun 28, 20:25 UTC3h 25m
2026-06-28 EJA878 DAL → SBA Jun 28, 15:40 UTCJun 28, 15:55 UTC15m
2026-06-28 EJA878 DAL → SBA Jun 28, 13:34 UTCJun 28, 14:14 UTC40m
2026-06-24 EJA878 DAL → SBA Jun 24, 22:25 UTCJun 24, 23:20 UTC55m
2026-06-24 EJA878 DAL → SBA Jun 24, 20:20 UTCJun 24, 21:09 UTC50m
2026-06-24 EJA878 DAL → SBA Jun 24, 17:50 UTCJun 24, 18:15 UTC25m
2026-06-24 EJA878 DAL → SBA Jun 24, 03:15 UTCJun 24, 04:00 UTC45m
2026-06-23 EJA878 DAL → SBA Jun 23, 23:50 UTCJun 24, 00:40 UTC50m
2026-06-23 EJA878 DAL → SBA Jun 23, 21:49 UTCJun 23, 23:00 UTC1h 10m
2026-06-23 EJA878 DAL → SBA Jun 23, 18:10 UTCJun 23, 19:19 UTC1h 10m
2026-06-22 EJA878 DAL → SBA Jun 22, 23:29 UTCJun 23, 02:24 UTC2h 55m
2026-06-22 EJA878 DAL → SBA Jun 22, 17:29 UTCJun 22, 19:34 UTC2h 5m
2026-06-20 EJA878 DAL → SBA Jun 20, 21:05 UTCJun 20, 22:14 UTC1h 10m
2026-06-20 EJA878 DAL → SBA Jun 20, 17:59 UTCJun 20, 18:54 UTC55m
2026-06-20 EJA878 DAL → SBA Jun 20, 15:19 UTCJun 20, 16:59 UTC1h 40m
2026-06-20 EJA878 DAL → SBA Jun 20, 04:34 UTCJun 20, 04:59 UTC25m
2026-06-20 EJA878 DAL → SBA Jun 20, 02:14 UTCJun 20, 03:59 UTC1h 45m
2026-06-19 EJA878 DAL → SBA Jun 19, 22:19 UTCJun 20, 00:09 UTC1h 50m
2026-06-19 EJA878 DAL → SBA Jun 19, 13:29 UTCJun 19, 21:14 UTC7h 45m
2026-06-19 EJA878 DAL → SBA Jun 19, 00:05 UTCJun 19, 01:15 UTC1h 9m
2026-06-18 EJA878 DAL → SBA Jun 18, 22:30 UTCJun 18, 23:30 UTC1h 0m
2026-06-18 EJA878 DAL → SBA Jun 18, 18:20 UTCJun 18, 20:55 UTC2h 35m
2026-06-17 EJA878 DAL → SBA Jun 17, 22:50 UTCJun 18, 02:35 UTC3h 45m
2026-06-17 EJA878 DAL → SBA Jun 17, 14:55 UTCJun 17, 19:30 UTC4h 35m
2026-06-17 EJA878 DAL → SBA Jun 17, 00:25 UTCJun 17, 01:50 UTC1h 25m
2026-06-16 EJA878 DAL → SBA Jun 16, 21:05 UTCJun 16, 23:20 UTC2h 15m
2026-06-16 EJA878 DAL → SBA Jun 16, 18:55 UTCJun 16, 20:25 UTC1h 31m
2026-06-16 EJA878 DAL → SBA Jun 16, 15:30 UTCJun 16, 17:24 UTC1h 55m
2026-06-15 EJA878 DAL → SBA Jun 15, 23:54 UTCJun 16, 00:10 UTC15m
2026-06-15 EJA878 DAL → SBA Jun 15, 20:04 UTCJun 15, 22:59 UTC2h 55m
2026-06-15 EJA878 DAL → SBA Jun 15, 16:45 UTCJun 15, 17:30 UTC45m
2026-06-15 EJA878 DAL → SBA Jun 15, 12:45 UTCJun 15, 14:10 UTC1h 25m
2026-06-14 EJA878 DAL → SBA Jun 14, 23:15 UTCJun 15, 00:10 UTC55m
2026-06-14 EJA878 DAL → SBA Jun 14, 22:00 UTCJun 14, 22:35 UTC35m
2026-06-14 EJA878 DAL → SBA Jun 14, 18:05 UTCJun 14, 21:05 UTC3h 0m
2026-06-14 N878QS - Jun 14, 13:45 UTCJun 14, 16:15 UTC2h 30m
2026-06-13 N878QS - Jun 13, 13:05 UTCJun 13, 16:05 UTC3h 0m
2026-06-12 EJA878 DAL → SBA Jun 12, 20:30 UTCJun 12, 21:45 UTC1h 15m
2026-06-12 EJA878 DAL → SBA Jun 12, 18:20 UTCJun 12, 19:45 UTC1h 25m

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 N878QS page for operator, model, and routing details .

Mode-S AC157D frequently asked

What is Mode-S code AC157D?
AC157D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N878QS.
Where is Mode-S AC157D registered?
Mode-S code AC157D 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 AC157D broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC157D, octal 53012575, decimal 11,277,693.
What flights does AC157D operate?
Mode-S AC157D has broadcast 2 distinct callsigns, including EJA878, N878QS.