Apparatus

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sensors Mode-S transponder

A091B4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N136CG · LOCKHEED C-130 Hercules · operated by CSC DELAWARE TUST CO TRUSTEE

Hex
A091B4
Octal
50110664
Decimal
10,523,060
Country
US
Tail
N136CG
Type
C130
No current signal · last broadcast 2h ago
Flights observed
69
Distinct callsigns
2
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A091B4.

Country allocation

The ICAO 24-bit address A091B4 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
TKR136 - 66 2026-06-28
CUL136 - 3 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-28 TKR136 SBD → SBD Jun 28, 21:04 UTCJun 28, 21:24 UTC20m
2026-06-28 TKR136 - Jun 28, 02:44 UTCJun 28, 03:50 UTC1h 5m
2026-06-28 TKR136 - Jun 28, 00:55 UTCJun 28, 01:25 UTC30m
2026-06-23 TKR136 - Jun 23, 20:24 UTCJun 23, 20:44 UTC20m
2026-06-23 TKR136 - Jun 23, 18:10 UTCJun 23, 18:34 UTC25m
2026-06-22 TKR136 - Jun 22, 20:00 UTCJun 22, 21:30 UTC1h 30m
2026-06-22 TKR136 - Jun 22, 17:55 UTCJun 22, 18:19 UTC25m
2026-06-22 TKR136 - Jun 22, 01:05 UTCJun 22, 01:40 UTC35m
2026-06-21 TKR136 HIF → HIF Jun 21, 23:59 UTCJun 22, 00:40 UTC40m
2026-06-21 TKR136 - Jun 21, 23:00 UTCJun 21, 23:40 UTC40m
2026-06-21 TKR136 HIF → HIF Jun 21, 21:44 UTCJun 21, 22:24 UTC40m
2026-06-21 TKR136 - Jun 21, 20:34 UTCJun 21, 21:14 UTC40m
2026-06-21 TKR136 - Jun 21, 19:24 UTCJun 21, 20:05 UTC40m
2026-06-20 TKR136 - Jun 20, 02:49 UTCJun 20, 03:19 UTC30m
2026-06-19 TKR136 - Jun 19, 22:24 UTCJun 19, 23:09 UTC45m
2026-06-19 TKR136 - Jun 19, 21:39 UTCJun 19, 21:49 UTC10m
2026-06-19 TKR136 - Jun 19, 20:04 UTCJun 19, 20:29 UTC25m
2026-06-19 TKR136 - Jun 19, 18:39 UTCJun 19, 19:04 UTC25m
2026-06-18 TKR136 - Jun 18, 23:15 UTCJun 18, 23:35 UTC20m
2026-06-18 TKR136 - Jun 18, 03:35 UTCJun 18, 04:10 UTC35m
2026-06-18 TKR136 - Jun 18, 00:35 UTCJun 18, 01:05 UTC30m
2026-06-17 TKR136 - Jun 17, 19:45 UTCJun 17, 20:40 UTC55m
2026-06-17 TKR136 - Jun 17, 01:25 UTCJun 17, 01:50 UTC25m
2026-06-16 TKR136 COE → COE Jun 16, 23:25 UTCJun 16, 23:50 UTC25m
2026-06-16 TKR136 - Jun 16, 22:45 UTCJun 16, 23:05 UTC20m
2026-06-16 TKR136 - Jun 16, 20:55 UTCJun 16, 22:15 UTC1h 20m
2026-06-15 TKR136 - Jun 15, 23:09 UTCJun 16, 01:45 UTC2h 35m
2026-06-14 TKR136 - Jun 14, 23:59 UTCJun 15, 01:04 UTC1h 5m
2026-06-13 TKR136 - Jun 13, 23:15 UTCJun 13, 23:50 UTC35m
2026-06-13 TKR136 - Jun 13, 22:20 UTCJun 13, 22:45 UTC25m
2026-06-13 TKR136 - Jun 13, 21:25 UTCJun 13, 21:50 UTC25m
2026-06-13 TKR136 - Jun 13, 20:25 UTCJun 13, 20:55 UTC30m
2026-06-13 TKR136 - Jun 13, 19:15 UTCJun 13, 19:50 UTC35m
2026-06-12 TKR136 - Jun 12, 23:45 UTCJun 13, 00:10 UTC25m
2026-06-12 TKR136 - Jun 12, 20:10 UTCJun 12, 20:35 UTC25m
2026-06-12 TKR136 - Jun 12, 00:10 UTCJun 12, 00:35 UTC26m
2026-06-11 TKR136 - Jun 11, 20:35 UTCJun 11, 21:00 UTC25m
2026-06-11 TKR136 - Jun 11, 18:30 UTCJun 11, 18:55 UTC25m
2026-06-11 TKR136 - Jun 11, 17:10 UTCJun 11, 17:35 UTC25m
2026-06-11 TKR136 - Jun 11, 02:45 UTCJun 11, 03:10 UTC25m
2026-06-10 TKR136 - Jun 10, 23:15 UTCJun 10, 23:45 UTC30m
2026-06-10 TKR136 - Jun 10, 19:30 UTCJun 10, 20:20 UTC50m
2026-06-10 TKR136 - Jun 10, 17:25 UTCJun 10, 18:10 UTC45m
2026-06-06 TKR136 - Jun 6, 23:35 UTCJun 7, 00:34 UTC1h 0m
2026-06-06 TKR136 - Jun 6, 00:50 UTCJun 6, 01:00 UTC10m
2026-05-29 TKR136 - May 29, 00:40 UTCMay 29, 02:00 UTC1h 20m
2026-05-24 TKR136 - May 24, 21:05 UTCMay 24, 21:15 UTC10m
2026-05-24 TKR136 - May 24, 19:50 UTCMay 24, 20:00 UTC10m
2026-05-24 TKR136 - May 24, 00:15 UTCMay 24, 00:25 UTC10m
2026-05-23 TKR136 - May 23, 22:45 UTCMay 23, 23:10 UTC25m

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 N136CG page for operator, model, and routing details .

Mode-S A091B4 frequently asked

What is Mode-S code A091B4?
A091B4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N136CG.
Where is Mode-S A091B4 registered?
Mode-S code A091B4 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 A091B4 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A091B4, octal 50110664, decimal 10,523,060.
What flights does A091B4 operate?
Mode-S A091B4 has broadcast 2 distinct callsigns, including TKR136, CUL136.