Apparatus

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sensors Mode-S transponder

A68DD1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N521N · EMBRAER EMB-505 Phenom 300 · operated by TAYLOR AIR LLC

Hex
A68DD1
Octal
51506721
Decimal
10,915,281
Country
US
Tail
N521N
Type
E55P
No current signal · last broadcast 8h ago
Flights observed
216
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A68DD1.

Country allocation

The ICAO 24-bit address A68DD1 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
JTZ521 - 216 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 JTZ521 - Jul 21, 00:10 UTCJul 21, 01:20 UTC1h 10m
2026-07-20 JTZ521 - Jul 20, 22:30 UTCJul 20, 23:45 UTC1h 15m
2026-07-20 JTZ521 - Jul 20, 20:25 UTCJul 20, 21:50 UTC1h 25m
2026-07-20 JTZ521 - Jul 20, 18:05 UTCJul 20, 18:35 UTC30m
2026-07-20 JTZ521 - Jul 20, 16:15 UTCJul 20, 17:05 UTC50m
2026-07-19 JTZ521 - Jul 19, 18:40 UTCJul 19, 19:55 UTC1h 15m
2026-07-19 JTZ521 - Jul 19, 15:50 UTCJul 19, 16:30 UTC40m
2026-07-18 JTZ521 - Jul 18, 21:10 UTCJul 18, 22:25 UTC1h 15m
2026-07-18 JTZ521 - Jul 18, 18:10 UTCJul 18, 19:05 UTC55m
2026-07-18 JTZ521 - Jul 18, 16:40 UTCJul 18, 17:15 UTC35m
2026-07-18 JTZ521 - Jul 18, 13:45 UTCJul 18, 14:25 UTC40m
2026-07-18 JTZ521 - Jul 18, 00:00 UTCJul 18, 01:10 UTC1h 10m
2026-07-17 JTZ521 - Jul 17, 23:00 UTCJul 17, 23:14 UTC15m
2026-07-17 JTZ521 - Jul 17, 14:04 UTCJul 17, 15:15 UTC1h 10m
2026-07-17 JTZ521 - Jul 17, 00:40 UTCJul 17, 01:29 UTC50m
2026-07-16 JTZ521 - Jul 16, 22:49 UTCJul 16, 23:55 UTC1h 5m
2026-07-16 JTZ521 - Jul 16, 18:29 UTCJul 16, 19:40 UTC1h 10m
2026-07-15 JTZ521 - Jul 15, 15:50 UTCJul 15, 17:10 UTC1h 20m
2026-07-15 JTZ521 - Jul 15, 13:45 UTCJul 15, 14:15 UTC30m
2026-07-15 JTZ521 - Jul 15, 11:20 UTCJul 15, 12:50 UTC1h 30m
2026-07-14 JTZ521 - Jul 14, 19:50 UTCJul 14, 20:55 UTC1h 5m
2026-07-14 JTZ521 - Jul 14, 17:15 UTCJul 14, 18:05 UTC50m
2026-07-14 JTZ521 - Jul 14, 15:10 UTCJul 14, 16:20 UTC1h 10m
2026-07-13 JTZ521 - Jul 13, 22:50 UTCJul 14, 00:10 UTC1h 20m
2026-07-13 JTZ521 - Jul 13, 20:50 UTCJul 13, 21:40 UTC50m
2026-07-13 JTZ521 - Jul 13, 19:25 UTCJul 13, 20:05 UTC40m
2026-07-13 JTZ521 - Jul 13, 16:45 UTCJul 13, 17:00 UTC15m
2026-07-12 JTZ521 - Jul 12, 15:20 UTCJul 12, 17:05 UTC1h 45m
2026-07-11 JTZ521 - Jul 11, 20:15 UTCJul 11, 20:25 UTC10m
2026-07-11 JTZ521 - Jul 11, 17:15 UTCJul 11, 19:00 UTC1h 45m
2026-07-10 JTZ521 - Jul 10, 20:10 UTCJul 10, 20:45 UTC35m
2026-07-10 JTZ521 - Jul 10, 18:35 UTCJul 10, 18:50 UTC15m
2026-07-10 JTZ521 - Jul 10, 15:15 UTCJul 10, 17:25 UTC2h 10m
2026-07-10 JTZ521 - Jul 10, 12:00 UTCJul 10, 13:25 UTC1h 25m
2026-07-09 JTZ521 - Jul 9, 16:15 UTCJul 9, 17:40 UTC1h 25m
2026-07-09 JTZ521 PIE → OLV Jul 9, 13:55 UTCJul 9, 15:25 UTC1h 30m
2026-07-08 JTZ521 - Jul 8, 21:50 UTCJul 8, 22:40 UTC50m
2026-07-08 JTZ521 - Jul 8, 20:00 UTCJul 8, 20:20 UTC20m
2026-07-08 JTZ521 - Jul 8, 17:50 UTCJul 8, 18:50 UTC1h 0m
2026-07-08 JTZ521 - Jul 8, 16:00 UTCJul 8, 17:00 UTC1h 0m
2026-07-07 JTZ521 - Jul 7, 19:55 UTCJul 7, 21:05 UTC1h 10m
2026-07-07 JTZ521 - Jul 7, 16:15 UTCJul 7, 17:00 UTC45m
2026-07-07 JTZ521 - Jul 7, 14:15 UTCJul 7, 14:55 UTC40m
2026-07-06 JTZ521 - Jul 6, 19:35 UTCJul 6, 20:35 UTC1h 0m
2026-07-06 JTZ521 - Jul 6, 15:55 UTCJul 6, 17:15 UTC1h 20m
2026-07-06 JTZ521 - Jul 6, 13:10 UTCJul 6, 14:10 UTC1h 0m
2026-07-05 JTZ521 - Jul 5, 21:20 UTCJul 5, 23:45 UTC2h 25m
2026-07-05 JTZ521 - Jul 5, 16:25 UTCJul 5, 18:40 UTC2h 15m
2026-07-05 JTZ521 - Jul 5, 00:30 UTCJul 5, 01:15 UTC45m
2026-07-04 JTZ521 - Jul 4, 22:55 UTCJul 4, 23:40 UTC45m

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 N521N page for operator, model, and routing details .

Mode-S A68DD1 frequently asked

What is Mode-S code A68DD1?
A68DD1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N521N.
Where is Mode-S A68DD1 registered?
Mode-S code A68DD1 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 A68DD1 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A68DD1, octal 51506721, decimal 10,915,281.
What flights does A68DD1 operate?
Mode-S A68DD1 has broadcast 1 distinct callsign, including JTZ521.