Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A44CFD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N3764D · BOEING 737-800 · operated by DELTA AIR LINES INC

Hex
A44CFD
Octal
51046375
Decimal
10,767,613
Country
US
Tail
N3764D
Type
B738
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
533
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S A44CFD.

Country allocation

The ICAO 24-bit address A44CFD 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
DAL2419 - 12 2026-07-04
DAL1439 - 10 2026-07-17
DAL2613 Delta Air Lines 9 2026-07-25
DAL2508 Delta Air Lines 9 2026-07-24
DAL776 Delta Air Lines 8 2026-07-18
DAL2955 - 8 2026-07-05
DAL2824 - 8 2026-07-07
DAL1362 Delta Air Lines 8 2026-04-15
DAL1080 - 8 2026-06-26
DAL2290 - 7 2026-06-26
DAL1399 - 7 2026-07-16
DAL869 - 6 2026-07-11
DAL760 - 6 2026-07-14
DAL2406 Delta Air Lines 6 2026-04-19
DAL2393 - 6 2026-07-15
DAL2234 Delta Air Lines 6 2026-04-19
DAL1595 - 6 2026-06-27
DAL736 - 5 2026-06-18
DAL2956 Delta Air Lines 5 2026-07-22
DAL2922 Delta Air Lines 5 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2226 ATL → EWR Jul 26, 19:10 UTCJul 26, 21:05 UTC1h 55m
2026-07-26 DAL2526 MSY → ATL Jul 26, 14:50 UTCJul 26, 17:00 UTC2h 10m
2026-07-26 DAL2526 MSY → ATL Jul 26, 14:47 UTCJul 26, 17:01 UTC2h 14m
2026-07-26 DAL2536 MSP → PHL Jul 26, 11:12 UTCJul 26, 13:43 UTC2h 31m
2026-07-26 DAL2536 MSP → PHL Jul 26, 11:15 UTCJul 26, 13:35 UTC2h 20m
2026-07-25 DAL2336 ATL → TLH Jul 25, 21:30 UTCJul 25, 23:05 UTC1h 35m
2026-07-25 DAL2055 PDX → SEA Jul 25, 14:30 UTCJul 25, 17:50 UTC3h 20m
2026-07-25 DAL2613 ORD → LGA Jul 25, 02:21 UTCJul 25, 04:34 UTC2h 13m
2026-07-25 DAL2613 ORD → LGA Jul 25, 02:25 UTCJul 25, 04:35 UTC2h 10m
2026-07-24 DAL2613 ORD → LGA Jul 24, 22:30 UTCJul 25, 00:50 UTC2h 20m
2026-07-24 DAL2508 DTW → PWM Jul 24, 18:30 UTCJul 24, 20:35 UTC2h 5m
2026-07-24 DAL2508 DTW → PWM Jul 24, 14:40 UTCJul 24, 17:05 UTC2h 25m
2026-07-24 DAL2613 ORD → LGA Jul 24, 06:13 UTCJul 24, 08:18 UTC2h 5m
2026-07-24 DAL2613 ORD → LGA Jul 24, 06:15 UTCJul 24, 08:25 UTC2h 10m
2026-07-24 DAL2613 ORD → LGA Jul 24, 04:00 UTCJul 24, 04:35 UTC35m
2026-07-24 DAL2267 SFO → LAX Jul 24, 00:49 UTCJul 24, 01:44 UTC55m
2026-07-24 DAL2267 SFO → LAX Jul 24, 00:50 UTCJul 24, 01:50 UTC1h 0m
2026-07-23 DAL2267 SFO → LAX Jul 23, 22:35 UTCJul 23, 23:30 UTC55m
2026-07-23 DAL1715 DTW → SAT Jul 23, 19:50 UTCJul 23, 20:45 UTC55m
2026-07-23 DAL1715 DTW → SAT Jul 23, 17:40 UTCJul 23, 18:35 UTC55m
2026-07-23 DAL2534 SLC → PDX Jul 23, 12:25 UTCJul 23, 15:00 UTC2h 35m
2026-07-23 DAL2686 MSP → BWI Jul 23, 02:25 UTCJul 23, 04:55 UTC2h 30m
2026-07-22 DAL2830 MSP → DEN Jul 22, 22:30 UTCJul 23, 00:55 UTC2h 25m
2026-07-22 DAL2922 MSP → MSN Jul 22, 18:15 UTCJul 22, 20:10 UTC1h 55m
2026-07-22 DAL2922 MSP → MSN Jul 22, 14:50 UTCJul 22, 16:55 UTC2h 5m
2026-07-22 DAL2956 ATL → IND Jul 22, 02:00 UTCJul 22, 04:00 UTC2h 0m
2026-07-21 DAL1690 DTW → IAH Jul 21, 23:55 UTCJul 22, 00:55 UTC1h 0m
2026-07-21 DAL2249 PHX → MSP Jul 21, 19:40 UTCJul 21, 22:40 UTC3h 0m
2026-07-21 DAL2249 PHX → MSP Jul 21, 19:37 UTCJul 21, 22:31 UTC2h 54m
2026-07-20 DAL2377 SLC → ORD Jul 20, 20:50 UTCJul 20, 23:45 UTC2h 55m
2026-07-20 DAL2377 SLC → ORD Jul 20, 20:49 UTCJul 20, 23:43 UTC2h 54m
2026-07-20 DAL1971 BZN → SLC Jul 20, 18:19 UTCJul 20, 19:13 UTC54m
2026-07-20 DAL1971 - Jul 20, 16:15 UTCJul 20, 16:45 UTC30m
2026-07-20 DAL2876 - Jul 20, 11:30 UTCJul 20, 14:40 UTC3h 10m
2026-07-20 DAL2395 ATL → CVG Jul 20, 05:50 UTCJul 20, 06:45 UTC55m
2026-07-20 DAL2902 IAD → ATL Jul 20, 03:05 UTCJul 20, 04:20 UTC1h 15m
2026-07-20 DAL2902 IAD → ATL Jul 20, 00:15 UTCJul 20, 01:35 UTC1h 20m
2026-07-19 DAL3092 - Jul 19, 20:35 UTCJul 19, 21:15 UTC40m
2026-07-19 DAL3092 VPS → ATL Jul 19, 20:31 UTCJul 19, 21:26 UTC55m
2026-07-19 DAL3092 - Jul 19, 16:50 UTCJul 19, 17:30 UTC40m
2026-07-19 DAL3048 - Jul 19, 14:45 UTCJul 19, 15:35 UTC50m
2026-07-19 DAL3048 - Jul 19, 12:50 UTCJul 19, 13:35 UTC45m
2026-07-19 DAL2441 PHL → DTW Jul 19, 09:50 UTCJul 19, 10:55 UTC1h 5m
2026-07-18 DAL1679 CVG → TPA Jul 18, 23:10 UTCJul 19, 01:00 UTC1h 50m
2026-07-18 DAL1679 CVG → TPA Jul 18, 20:15 UTCJul 18, 22:05 UTC1h 50m
2026-07-18 DAL1603 RSW → CVG Jul 18, 16:30 UTCJul 18, 18:30 UTC2h 0m
2026-07-18 DAL2474 BOS → RSW Jul 18, 11:50 UTCJul 18, 14:45 UTC2h 55m
2026-07-18 DAL776 BOS → DEN Jul 18, 01:25 UTCJul 18, 04:05 UTC2h 41m
2026-07-18 DAL776 BOS → DEN Jul 18, 01:25 UTCJul 18, 04:36 UTC3h 11m
2026-07-17 DAL776 BOS → DEN Jul 17, 20:00 UTCJul 17, 22:45 UTC2h 45m

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 N3764D page for operator, model, and routing details .

Mode-S A44CFD frequently asked

What is Mode-S code A44CFD?
A44CFD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N3764D.
Where is Mode-S A44CFD registered?
Mode-S code A44CFD 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 A44CFD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A44CFD, octal 51046375, decimal 10,767,613.
What flights does A44CFD operate?
Mode-S A44CFD has broadcast 20 distinct callsigns, including DAL2419, DAL1439, DAL2613, DAL2508, DAL776.