Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A850DC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N635FR · AIRBUS A-321neo · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A850DC
Octal
52050334
Decimal
11,030,748
Country
US
Tail
N635FR
Type
A21N
Broadcasting now · callsign FFT3241 · 5,875 ft
Flights observed
540
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Current position

A850DC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A850DC 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 20 distinct

Callsign Airline Flights Last seen
FFT4891 - 6 2026-07-12
FFT4427 - 6 2026-07-23
FFT3599 Frontier Airlines 6 2026-07-25
FFT1563 - 6 2026-07-12
FFT2871 Frontier Airlines 5 2026-05-27
FFT2636 - 5 2026-07-07
FFT2510 Frontier Airlines 5 2026-07-23
FFT2428 - 5 2026-07-16
FFT152 Frontier Airlines 5 2026-07-23
FFT1403 - 5 2026-07-22
FFT1177 Frontier Airlines 5 2026-07-26
FFT87 Frontier Airlines 4 2026-07-07
FFT70 Frontier Airlines 4 2026-07-25
FFT4916 Frontier Airlines 4 2026-05-27
FFT4732 Frontier Airlines 4 2026-05-28
FFT4545 Frontier Airlines 4 2026-07-26
FFT44 - 4 2026-07-07
FFT4144 Frontier Airlines 4 2026-04-25
FFT3450 - 4 2026-06-27
FFT3363 Frontier Airlines 4 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT1177 LAX → SEA Jul 26, 22:30 UTCJul 26, 23:00 UTC30m
2026-07-26 FFT1178 SEA → LAX Jul 26, 18:20 UTCJul 26, 20:50 UTC2h 30m
2026-07-26 FFT4545 DTW → PHX Jul 26, 13:25 UTCJul 26, 15:50 UTC2h 25m
2026-07-25 FFT3227 IAH → DEN Jul 25, 23:40 UTCJul 26, 01:35 UTC1h 55m
2026-07-25 FFT317 CUN → IAH Jul 25, 19:55 UTCJul 25, 21:40 UTC1h 45m
2026-07-25 FFT70 DEN → CUN Jul 25, 17:50 UTCJul 25, 18:15 UTC25m
2026-07-25 FFT70 DEN → CUN Jul 25, 14:50 UTCJul 25, 16:55 UTC2h 5m
2026-07-25 FFT3599 ATL → DEN Jul 25, 02:05 UTCJul 25, 04:40 UTC2h 35m
2026-07-24 FFT24 PUJ → ATL Jul 24, 15:50 UTCJul 24, 23:45 UTC7h 55m
2026-07-24 FFT4707 IAD → ATL Jul 24, 12:00 UTCJul 24, 13:40 UTC1h 40m
2026-07-24 FFT3692 ATL → IAD Jul 24, 01:50 UTCJul 24, 03:15 UTC1h 25m
2026-07-23 FFT152 CUN → ATL Jul 23, 20:45 UTCJul 23, 22:50 UTC2h 5m
2026-07-23 FFT153 ATL → CUN Jul 23, 17:15 UTCJul 23, 19:25 UTC2h 10m
2026-07-23 FFT4427 - Jul 23, 13:35 UTCJul 23, 15:00 UTC1h 25m
2026-07-23 FFT2510 TPA → GRR Jul 23, 09:45 UTCJul 23, 11:10 UTC1h 25m
2026-07-23 FFT2509 BWI → ATL Jul 23, 03:05 UTCJul 23, 04:20 UTC1h 15m
2026-07-22 FFT3068 IAH → BWI Jul 22, 21:55 UTCJul 23, 00:30 UTC2h 35m
2026-07-22 FFT1495 PHL → FLL Jul 22, 17:10 UTCJul 22, 19:15 UTC2h 5m
2026-07-22 FFT1496 FLL → PHL Jul 22, 13:30 UTCJul 22, 15:50 UTC2h 20m
2026-07-22 FFT1403 - Jul 22, 11:10 UTCJul 22, 11:50 UTC40m
2026-07-21 FFT3227 IAH → DEN Jul 21, 23:35 UTCJul 22, 01:35 UTC2h 0m
2026-07-21 FFT317 CUN → IAH Jul 21, 19:15 UTCJul 21, 21:10 UTC1h 55m
2026-07-21 FFT70 DEN → CUN Jul 21, 14:05 UTCJul 21, 17:35 UTC3h 30m
2026-07-21 FFT4369 TYS → DEN Jul 21, 00:25 UTCJul 21, 02:50 UTC2h 25m
2026-07-20 FFT2374 TPA → PHL Jul 20, 20:40 UTCJul 20, 22:55 UTC2h 15m
2026-07-20 FFT4639 - Jul 20, 16:25 UTCJul 20, 19:00 UTC2h 35m
2026-07-20 FFT1918 DEN → CLE Jul 20, 12:05 UTCJul 20, 14:35 UTC2h 30m
2026-07-20 FFT3599 ATL → DEN Jul 20, 01:15 UTCJul 20, 03:45 UTC2h 30m
2026-07-19 FFT152 CUN → ATL Jul 19, 20:20 UTCJul 19, 22:35 UTC2h 15m
2026-07-19 FFT153 ATL → CUN Jul 19, 16:20 UTCJul 19, 18:40 UTC2h 20m
2026-07-19 FFT4427 BWI → ATL Jul 19, 12:40 UTCJul 19, 14:00 UTC1h 20m
2026-07-19 FFT4427 BWI → ATL Jul 19, 12:49 UTCJul 19, 14:02 UTC1h 13m
2026-07-19 FFT2510 TPA → GRR Jul 19, 09:35 UTCJul 19, 11:00 UTC1h 25m
2026-07-18 FFT4474 STL → ATL Jul 18, 22:25 UTCJul 19, 00:15 UTC1h 50m
2026-07-18 FFT7 - Jul 18, 16:10 UTCJul 18, 19:35 UTC3h 25m
2026-07-18 FFT239 - Jul 18, 13:30 UTCJul 18, 13:40 UTC10m
2026-07-18 FFT239 SJU → PUJ Jul 18, 13:35 UTCJul 18, 14:00 UTC25m
2026-07-18 FFT240 - Jul 18, 02:19 UTCJul 18, 02:35 UTC15m
2026-07-18 FFT241 - Jul 18, 00:00 UTCJul 18, 00:10 UTC10m
2026-07-17 FFT38 PUJ → SJU Jul 17, 21:20 UTCJul 17, 21:30 UTC10m
2026-07-17 FFT6 - Jul 17, 15:20 UTCJul 17, 17:05 UTC1h 45m
2026-07-17 FFT4473 ATL → STL Jul 17, 12:45 UTCJul 17, 13:55 UTC1h 10m
2026-07-17 FFT4797 - Jul 17, 10:30 UTCJul 17, 11:20 UTC50m
2026-07-17 FFT1670 ATL → RDU Jul 17, 03:14 UTCJul 17, 04:20 UTC1h 5m
2026-07-16 FFT4702 - Jul 16, 23:20 UTCJul 17, 01:35 UTC2h 15m
2026-07-16 FFT4211 ATL → AUS Jul 16, 20:00 UTCJul 16, 21:50 UTC1h 50m
2026-07-16 FFT1407 - Jul 16, 16:25 UTCJul 16, 18:00 UTC1h 35m
2026-07-16 FFT1408 - Jul 16, 13:20 UTCJul 16, 15:00 UTC1h 40m
2026-07-16 FFT2428 LAS → ATL Jul 16, 08:00 UTCJul 16, 11:34 UTC3h 35m
2026-07-16 FFT3417 SAT → LAS Jul 16, 03:40 UTCJul 16, 06:05 UTC2h 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 N635FR page for operator, model, and routing details .

Mode-S A850DC frequently asked

What is Mode-S code A850DC?
A850DC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N635FR.
Where is Mode-S A850DC registered?
Mode-S code A850DC 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 A850DC broadcasting right now?
Yes. Mode-S A850DC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A850DC, octal 52050334, decimal 11,030,748.
What flights does A850DC operate?
Mode-S A850DC has broadcast 20 distinct callsigns, including FFT4891, FFT4427, FFT3599, FFT1563, FFT2871.