Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A449F1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N3759 · BOEING 737-800 · operated by DELTA AIR LINES INC

Hex
A449F1
Octal
51044761
Decimal
10,766,833
Country
US
Tail
N3759
Type
B738
Broadcasting now · callsign DAL1834 · 24,200 ft
Flights observed
454
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A449F1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A449F1 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
DAL1399 - 11 2026-07-12
DAL776 - 9 2026-07-04
DAL760 - 8 2026-07-08
DAL661 - 7 2026-07-14
DAL379 Delta Air Lines 7 2026-06-29
DAL2776 - 7 2026-07-04
DAL869 - 6 2026-07-07
DAL856 Delta Air Lines 6 2026-07-06
DAL846 - 6 2026-06-30
DAL687 Delta Air Lines 6 2026-04-13
DAL585 - 6 2026-07-15
DAL2496 Delta Air Lines 6 2026-05-31
DAL2106 Delta Air Lines 6 2026-07-26
DAL873 - 5 2026-06-30
DAL3160 - 5 2026-07-20
DAL2641 Delta Air Lines 5 2026-06-06
DAL2533 Delta Air Lines 5 2026-06-07
DAL2310 Delta Air Lines 5 2026-05-06
DAL2234 Delta Air Lines 5 2026-05-09
DAL2160 - 5 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2106 BDL → ATL Jul 26, 21:45 UTCJul 26, 22:15 UTC30m
2026-07-26 DAL2106 BDL → ATL Jul 26, 18:00 UTCJul 26, 20:20 UTC2h 20m
2026-07-26 DAL2339 SEA → SFO Jul 26, 13:05 UTCJul 26, 15:35 UTC2h 30m
2026-07-25 DAL2300 BDL → DTW Jul 25, 20:25 UTCJul 25, 22:55 UTC2h 30m
2026-07-25 DAL398 DFW → LGA Jul 25, 13:30 UTCJul 25, 16:40 UTC3h 10m
2026-07-24 DAL710 ATL → SFO Jul 24, 23:00 UTCJul 25, 02:40 UTC3h 40m
2026-07-24 DAL710 ATL → SFO Jul 24, 23:00 UTCJul 25, 02:43 UTC3h 43m
2026-07-24 DAL2239 MSY → BOS Jul 24, 19:45 UTCJul 24, 21:20 UTC1h 35m
2026-07-24 DAL2239 MSY → BOS Jul 24, 19:42 UTCJul 24, 21:23 UTC1h 41m
2026-07-24 DAL2055 PDX → SEA Jul 24, 14:35 UTCJul 24, 17:50 UTC3h 15m
2026-07-24 DAL1551 ATL → PHL Jul 24, 05:15 UTCJul 24, 07:10 UTC1h 55m
2026-07-24 DAL1551 ATL → PHL Jul 24, 05:10 UTCJul 24, 07:09 UTC1h 59m
2026-07-24 DAL2082 DTW → MSY Jul 24, 00:50 UTCJul 24, 04:00 UTC3h 10m
2026-07-23 DAL2939 MEM → ATL Jul 23, 22:05 UTCJul 23, 22:50 UTC45m
2026-07-23 DAL2020 RSW → BOS Jul 23, 18:25 UTCJul 23, 20:10 UTC1h 45m
2026-07-23 DAL2020 RSW → BOS Jul 23, 18:23 UTCJul 23, 20:01 UTC1h 38m
2026-07-23 DAL2020 RSW → BOS Jul 23, 15:20 UTCJul 23, 17:00 UTC1h 40m
2026-07-23 DAL1619 - Jul 23, 13:05 UTCJul 23, 13:35 UTC30m
2026-07-22 DAL2319 MCI → DTW Jul 22, 23:30 UTCJul 23, 00:05 UTC35m
2026-07-22 DAL2319 MCI → DTW Jul 22, 23:29 UTCJul 23, 00:01 UTC32m
2026-07-22 DAL3138 GNV → ATL Jul 22, 20:50 UTCJul 22, 22:00 UTC1h 10m
2026-07-22 DAL3138 GNV → ATL Jul 22, 20:50 UTCJul 22, 21:54 UTC1h 4m
2026-07-22 DAL2910 SNA → SEA Jul 22, 18:05 UTCJul 22, 19:10 UTC1h 5m
2026-07-22 DAL2987 - Jul 22, 13:45 UTCJul 22, 16:30 UTC2h 45m
2026-07-22 DAL1590 SEA → LAS Jul 22, 03:25 UTCJul 22, 04:15 UTC50m
2026-07-22 DAL1590 SEA → LAS Jul 22, 03:21 UTCJul 22, 04:15 UTC54m
2026-07-22 DAL2955 JFK → PBI Jul 22, 00:15 UTCJul 22, 02:25 UTC2h 10m
2026-07-21 DAL2419 ATL → BTV Jul 21, 19:30 UTCJul 21, 22:00 UTC2h 30m
2026-07-21 DAL2419 ATL → BTV Jul 21, 15:50 UTCJul 21, 18:20 UTC2h 30m
2026-07-21 DAL2616 ATL → TPA Jul 21, 04:35 UTCJul 21, 06:35 UTC2h 0m
2026-07-21 DAL2616 ATL → TPA Jul 21, 04:32 UTCJul 21, 06:33 UTC2h 1m
2026-07-21 DAL2861 ATL → CMH Jul 21, 00:45 UTCJul 21, 03:00 UTC2h 15m
2026-07-20 DAL2817 SLC → SEA Jul 20, 21:50 UTCJul 20, 23:25 UTC1h 35m
2026-07-20 DAL678 - Jul 20, 16:50 UTCJul 20, 20:00 UTC3h 10m
2026-07-20 DAL3160 ATL → CVG Jul 20, 14:20 UTCJul 20, 15:20 UTC1h 0m
2026-07-20 DAL3160 ATL → CVG Jul 20, 14:19 UTCJul 20, 15:19 UTC1h 0m
2026-07-19 DAL576 MEX → ATL Jul 19, 18:55 UTCJul 19, 21:50 UTC2h 55m
2026-07-19 DAL577 - Jul 19, 14:10 UTCJul 19, 17:05 UTC2h 55m
2026-07-18 DAL2878 SEA → SLC Jul 18, 20:15 UTCJul 19, 00:50 UTC4h 35m
2026-07-18 DAL2781 - Jul 18, 14:10 UTCJul 18, 18:10 UTC4h 0m
2026-07-18 DAL1436 - Jul 18, 10:40 UTCJul 18, 12:25 UTC1h 45m
2026-07-18 DAL2945 ATL → ATW Jul 18, 01:39 UTCJul 18, 03:30 UTC1h 51m
2026-07-17 DAL2337 - Jul 17, 19:35 UTCJul 17, 23:20 UTC3h 45m
2026-07-17 DAL1817 - Jul 17, 17:35 UTCJul 17, 17:44 UTC10m
2026-07-17 DAL1817 - Jul 17, 14:20 UTCJul 17, 16:59 UTC2h 40m
2026-07-17 DAL1436 - Jul 17, 11:00 UTCJul 17, 12:45 UTC1h 45m
2026-07-17 DAL2945 ATL → ATW Jul 17, 01:55 UTCJul 17, 03:34 UTC1h 40m
2026-07-16 DAL880 - Jul 16, 23:10 UTCJul 17, 00:45 UTC1h 35m
2026-07-16 DAL880 ATL → CLE Jul 16, 20:15 UTCJul 16, 21:35 UTC1h 20m
2026-07-16 DAL593 - Jul 16, 14:50 UTCJul 16, 17:40 UTC2h 50m

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 N3759 page for operator, model, and routing details .

Mode-S A449F1 frequently asked

What is Mode-S code A449F1?
A449F1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N3759.
Where is Mode-S A449F1 registered?
Mode-S code A449F1 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 A449F1 broadcasting right now?
Yes. Mode-S A449F1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A449F1, octal 51044761, decimal 10,766,833.
What flights does A449F1 operate?
Mode-S A449F1 has broadcast 20 distinct callsigns, including DAL1399, DAL776, DAL760, DAL661, DAL379.