Apparatus

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sensors Mode-S transponder

A55D6A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N445CH · AIRBUS HELICOPTERS EC-145 · operated by EGLESTON CHILDRENS HOSPITAL AT EMORY UNIV INC DBA, CHILDRENS HEALTHCARE OF ATLANTA AT EGLESTON

Hex
A55D6A
Octal
51256552
Decimal
10,837,354
Country
US
Tail
N445CH
Type
EC45
Broadcasting now · callsign N445CH · 1,900 ft
Flights observed
257
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 04:20 UTC

Current position

A55D6A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A55D6A 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 1 distinct

Callsign Airline Flights Last seen
N445CH - 257 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N445CH - Jul 26, 03:50 UTCJul 26, 04:15 UTC25m
2026-07-26 N445CH - Jul 26, 03:20 UTCJul 26, 03:45 UTC25m
2026-07-26 N445CH - Jul 26, 02:20 UTCJul 26, 02:45 UTC25m
2026-07-25 N445CH - Jul 25, 19:50 UTCJul 25, 20:00 UTC10m
2026-07-24 N445CH - Jul 24, 15:30 UTCJul 24, 15:35 UTC5m
2026-07-23 N445CH - Jul 23, 16:00 UTCJul 23, 16:55 UTC55m
2026-07-23 N445CH - Jul 23, 15:05 UTCJul 23, 15:25 UTC20m
2026-07-21 N445CH - Jul 21, 22:00 UTCJul 21, 22:50 UTC50m
2026-07-21 N445CH - Jul 21, 19:45 UTCJul 21, 20:25 UTC40m
2026-07-20 N445CH - Jul 20, 07:10 UTCJul 20, 08:10 UTC1h 0m
2026-07-20 N445CH - Jul 20, 06:20 UTCJul 20, 06:35 UTC15m
2026-07-19 N445CH - Jul 19, 13:25 UTCJul 19, 13:40 UTC15m
2026-07-19 N445CH - Jul 19, 12:30 UTCJul 19, 12:40 UTC10m
2026-07-18 N445CH - Jul 18, 11:05 UTCJul 18, 11:35 UTC30m
2026-07-18 N445CH - Jul 18, 09:55 UTCJul 18, 10:25 UTC30m
2026-07-18 N445CH - Jul 18, 00:55 UTCJul 18, 02:00 UTC1h 5m
2026-07-17 N445CH - Jul 17, 04:39 UTCJul 17, 06:15 UTC1h 35m
2026-07-16 N445CH - Jul 16, 09:30 UTCJul 16, 09:45 UTC15m
2026-07-16 N445CH - Jul 16, 01:15 UTCJul 16, 01:25 UTC10m
2026-07-16 N445CH - Jul 16, 00:35 UTCJul 16, 00:45 UTC10m
2026-07-15 N445CH - Jul 15, 20:40 UTCJul 15, 20:55 UTC15m
2026-07-15 N445CH - Jul 15, 19:40 UTCJul 15, 20:00 UTC20m
2026-07-12 N445CH - Jul 12, 19:50 UTCJul 12, 21:25 UTC1h 35m
2026-07-12 N445CH - Jul 12, 03:40 UTCJul 12, 04:30 UTC50m
2026-07-12 N445CH - Jul 12, 02:50 UTCJul 12, 03:05 UTC15m
2026-07-12 N445CH - Jul 12, 01:00 UTCJul 12, 01:55 UTC55m
2026-07-11 N445CH - Jul 11, 23:15 UTCJul 11, 23:40 UTC25m
2026-07-11 N445CH - Jul 11, 16:45 UTCJul 11, 17:15 UTC30m
2026-07-11 N445CH - Jul 11, 15:00 UTCJul 11, 15:45 UTC45m
2026-07-11 N445CH - Jul 11, 14:00 UTCJul 11, 14:20 UTC20m
2026-07-11 N445CH - Jul 11, 12:55 UTCJul 11, 13:15 UTC20m
2026-07-11 N445CH - Jul 11, 06:35 UTCJul 11, 07:35 UTC1h 0m
2026-07-11 N445CH - Jul 11, 05:40 UTCJul 11, 05:55 UTC15m
2026-07-11 N445CH - Jul 11, 04:45 UTCJul 11, 05:05 UTC20m
2026-07-11 N445CH - Jul 11, 04:30 UTCJul 11, 04:40 UTC10m
2026-07-11 N445CH - Jul 11, 03:25 UTCJul 11, 03:40 UTC15m
2026-07-11 N445CH - Jul 11, 00:30 UTCJul 11, 01:25 UTC55m
2026-07-10 N445CH - Jul 10, 22:50 UTCJul 10, 23:25 UTC35m
2026-07-10 N445CH - Jul 10, 06:05 UTCJul 10, 06:25 UTC20m
2026-07-10 N445CH - Jul 10, 05:15 UTCJul 10, 05:30 UTC15m
2026-07-10 N445CH - Jul 10, 04:25 UTCJul 10, 04:35 UTC10m
2026-07-09 N445CH - Jul 9, 18:05 UTCJul 9, 19:00 UTC55m
2026-07-09 N445CH - Jul 9, 16:40 UTCJul 9, 17:05 UTC25m
2026-07-09 N445CH - Jul 9, 04:50 UTCJul 9, 06:35 UTC1h 45m
2026-07-08 N445CH - Jul 8, 05:45 UTCJul 8, 06:50 UTC1h 5m
2026-07-08 N445CH - Jul 8, 04:45 UTCJul 8, 05:05 UTC20m
2026-07-08 N445CH - Jul 8, 03:15 UTCJul 8, 04:15 UTC1h 0m
2026-07-08 N445CH - Jul 8, 02:10 UTCJul 8, 02:30 UTC20m
2026-07-06 N445CH - Jul 6, 23:55 UTCJul 7, 01:25 UTC1h 30m
2026-07-05 N445CH - Jul 5, 09:45 UTCJul 5, 11:15 UTC1h 30m

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 N445CH page for operator, model, and routing details .

Mode-S A55D6A frequently asked

What is Mode-S code A55D6A?
A55D6A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N445CH.
Where is Mode-S A55D6A registered?
Mode-S code A55D6A 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 A55D6A broadcasting right now?
Yes. Mode-S A55D6A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55D6A, octal 51256552, decimal 10,837,354.
What flights does A55D6A operate?
Mode-S A55D6A has broadcast 1 distinct callsign, including N445CH.