Apparatus

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sensors Mode-S transponder

A0956B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N137CG · BOEING 737-300 · operated by CSC DELAWARE TRUST CO TRUSTEE

Hex
A0956B
Octal
50112553
Decimal
10,524,011
Country
US
Tail
N137CG
Type
B733
No current signal · last broadcast 17d ago
Flights observed
182
Distinct callsigns
2
Country
US
Last broadcast
17d ago

Last known position

Most recent position reported by Mode-S A0956B.

Country allocation

The ICAO 24-bit address A0956B 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
TKR137 - 180 2026-07-26
CUL137 - 2 2026-04-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TKR137 - Jul 26, 21:30 UTCJul 26, 21:45 UTC15m
2026-07-26 TKR137 - Jul 26, 19:15 UTCJul 26, 20:00 UTC45m
2026-07-26 TKR137 - Jul 26, 18:00 UTCJul 26, 18:45 UTC45m
2026-07-26 TKR137 - Jul 26, 03:25 UTCJul 26, 03:40 UTC15m
2026-07-26 TKR137 - Jul 26, 02:30 UTCJul 26, 02:45 UTC15m
2026-07-26 TKR137 - Jul 26, 00:25 UTCJul 26, 01:20 UTC55m
2026-07-25 TKR137 - Jul 25, 23:10 UTCJul 25, 23:50 UTC40m
2026-07-25 TKR137 - Jul 25, 20:45 UTCJul 25, 22:40 UTC1h 55m
2026-07-25 TKR137 - Jul 25, 18:30 UTCJul 25, 20:00 UTC1h 30m
2026-07-25 TKR137 - Jul 25, 02:35 UTCJul 25, 03:00 UTC25m
2026-07-24 TKR137 - Jul 24, 23:50 UTCJul 25, 01:45 UTC1h 55m
2026-07-24 TKR137 - Jul 24, 20:50 UTCJul 24, 23:15 UTC2h 25m
2026-07-24 TKR137 - Jul 24, 02:00 UTCJul 24, 02:55 UTC55m
2026-07-24 TKR137 - Jul 24, 00:05 UTCJul 24, 00:15 UTC10m
2026-07-23 TKR137 - Jul 23, 22:50 UTCJul 23, 23:05 UTC15m
2026-07-20 TKR137 - Jul 20, 02:00 UTCJul 20, 02:20 UTC20m
2026-07-19 TKR137 - Jul 19, 21:45 UTCJul 19, 21:55 UTC10m
2026-07-19 TKR137 - Jul 19, 21:05 UTCJul 19, 21:20 UTC15m
2026-07-19 TKR137 - Jul 19, 19:20 UTCJul 19, 19:30 UTC10m
2026-07-19 TKR137 - Jul 19, 17:05 UTCJul 19, 17:20 UTC15m
2026-07-19 TKR137 - Jul 19, 16:30 UTCJul 19, 16:45 UTC15m
2026-07-19 TKR137 - Jul 19, 03:40 UTCJul 19, 03:55 UTC15m
2026-07-19 TKR137 - Jul 19, 03:05 UTCJul 19, 03:20 UTC15m
2026-07-19 TKR137 - Jul 19, 02:30 UTCJul 19, 02:40 UTC10m
2026-07-19 TKR137 RDD → RDD Jul 19, 01:40 UTCJul 19, 02:00 UTC20m
2026-07-19 TKR137 - Jul 19, 01:05 UTCJul 19, 01:20 UTC15m
2026-07-19 TKR137 - Jul 19, 00:30 UTCJul 19, 00:45 UTC15m
2026-07-18 TKR137 - Jul 18, 23:40 UTCJul 19, 00:00 UTC20m
2026-07-18 TKR137 - Jul 18, 22:35 UTCJul 18, 23:20 UTC45m
2026-07-18 TKR137 MFR → RDD Jul 18, 21:15 UTCJul 18, 22:10 UTC55m
2026-07-18 TKR137 MFR → MFR Jul 18, 17:05 UTCJul 18, 17:40 UTC35m
2026-07-18 TKR137 - Jul 18, 03:35 UTCJul 18, 04:20 UTC45m
2026-07-18 TKR137 RDM → RDM Jul 18, 02:40 UTCJul 18, 03:05 UTC26m
2026-07-18 TKR137 RDM → RDM Jul 18, 01:15 UTCJul 18, 02:09 UTC55m
2026-07-18 TKR137 - Jul 18, 00:35 UTCJul 18, 00:45 UTC10m
2026-07-17 TKR137 - Jul 17, 23:10 UTCJul 17, 23:50 UTC40m
2026-07-17 TKR137 - Jul 17, 21:55 UTCJul 17, 22:35 UTC40m
2026-07-17 TKR137 - Jul 17, 20:20 UTCJul 17, 20:40 UTC20m
2026-07-17 TKR137 - Jul 17, 03:30 UTCJul 17, 04:29 UTC1h 0m
2026-07-17 TKR137 - Jul 17, 01:05 UTCJul 17, 01:25 UTC20m
2026-07-16 TKR137 - Jul 16, 23:59 UTCJul 17, 00:14 UTC15m
2026-07-16 TKR137 - Jul 16, 22:49 UTCJul 16, 23:15 UTC25m
2026-07-16 TKR137 - Jul 16, 20:00 UTCJul 16, 22:15 UTC2h 15m
2026-07-16 TKR137 - Jul 16, 18:29 UTCJul 16, 19:25 UTC55m
2026-07-16 TKR137 - Jul 16, 03:35 UTCJul 16, 03:55 UTC20m
2026-07-16 TKR137 MFR → MFR Jul 16, 02:10 UTCJul 16, 03:15 UTC1h 5m
2026-07-16 TKR137 - Jul 16, 00:20 UTCJul 16, 00:30 UTC10m
2026-07-15 TKR137 - Jul 15, 23:35 UTCJul 15, 23:50 UTC15m
2026-07-15 TKR137 - Jul 15, 22:45 UTCJul 15, 23:00 UTC15m
2026-07-15 TKR137 - Jul 15, 02:55 UTCJul 15, 03:15 UTC20m

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 N137CG page for operator, model, and routing details .

Mode-S A0956B frequently asked

What is Mode-S code A0956B?
A0956B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N137CG.
Where is Mode-S A0956B registered?
Mode-S code A0956B 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 A0956B broadcasting right now?
No active broadcast right now. Last signal was 17d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0956B, octal 50112553, decimal 10,524,011.
What flights does A0956B operate?
Mode-S A0956B has broadcast 2 distinct callsigns, including TKR137, CUL137.