Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A491F1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N394DA · BOEING 737-800 · operated by DELTA AIR LINES INC

Hex
A491F1
Octal
51110761
Decimal
10,785,265
Country
US
Tail
N394DA
Type
B738
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
477
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S A491F1.

Country allocation

The ICAO 24-bit address A491F1 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
DAL2905 Delta Air Lines 16 2026-05-03
DAL716 Delta Air Lines 12 2026-07-22
DAL2419 - 12 2026-07-12
DAL2267 Delta Air Lines 10 2026-05-17
DAL2880 - 9 2026-07-10
DAL922 - 8 2026-06-27
DAL853 Delta Air Lines 8 2026-05-09
DAL2449 Delta Air Lines 7 2026-06-05
DAL751 Delta Air Lines 6 2026-07-23
DAL398 - 6 2026-07-20
DAL306 Delta Air Lines 6 2026-05-16
DAL2980 - 6 2026-07-10
DAL2259 Delta Air Lines 6 2026-05-14
DAL2239 - 6 2026-07-16
DAL2196 - 6 2026-06-22
DAL2055 - 6 2026-07-15
DAL1841 Delta Air Lines 6 2026-07-02
DAL1514 - 6 2026-06-25
DAL1399 Delta Air Lines 6 2026-05-19
DAL1398 - 6 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2824 MSY → ATL Jul 26, 20:05 UTCJul 26, 21:50 UTC1h 45m
2026-07-26 DAL2273 BOS → RDU Jul 26, 15:50 UTCJul 26, 18:45 UTC2h 55m
2026-07-26 DAL2273 BOS → RDU Jul 26, 15:47 UTCJul 26, 18:42 UTC2h 55m
2026-07-26 DAL1526 ATL → DTW Jul 26, 12:40 UTCJul 26, 13:50 UTC1h 10m
2026-07-26 DAL1582 MSP → CHS Jul 26, 04:05 UTCJul 26, 05:25 UTC1h 20m
2026-07-25 DAL1951 SJD → SLC Jul 25, 21:25 UTCJul 25, 23:20 UTC1h 55m
2026-07-25 DAL1952 SLC → SJD Jul 25, 16:35 UTCJul 25, 18:15 UTC1h 40m
2026-07-25 DAL1952 SLC → SJD Jul 25, 16:33 UTCJul 25, 19:19 UTC2h 46m
2026-07-25 DAL2876 CVG → SLC Jul 25, 11:35 UTCJul 25, 14:50 UTC3h 15m
2026-07-24 DAL1679 CVG → TPA Jul 24, 22:35 UTCJul 25, 00:20 UTC1h 45m
2026-07-24 DAL1679 CVG → TPA Jul 24, 19:30 UTCJul 24, 21:05 UTC1h 35m
2026-07-24 DAL1603 PBI → ATL Jul 24, 16:10 UTCJul 24, 18:05 UTC1h 55m
2026-07-24 DAL2474 BOS → RSW Jul 24, 11:50 UTCJul 24, 14:40 UTC2h 50m
2026-07-24 DAL522 ATL → LGA Jul 24, 02:25 UTCJul 24, 05:05 UTC2h 40m
2026-07-24 DAL522 ATL → LGA Jul 24, 02:21 UTCJul 24, 05:04 UTC2h 43m
2026-07-23 DAL2321 MKE → DTW Jul 23, 22:45 UTCJul 24, 01:15 UTC2h 30m
2026-07-23 DAL751 MSP → SEA Jul 23, 17:40 UTCJul 23, 20:50 UTC3h 10m
2026-07-23 DAL751 MSP → SEA Jul 23, 12:20 UTCJul 23, 16:10 UTC3h 50m
2026-07-23 DAL2336 - Jul 23, 00:00 UTCJul 23, 01:25 UTC1h 25m
2026-07-22 DAL2226 ATL → EWR Jul 22, 19:45 UTCJul 22, 22:00 UTC2h 15m
2026-07-22 DAL2526 MSY → ATL Jul 22, 15:40 UTCJul 22, 18:05 UTC2h 25m
2026-07-22 DAL2526 MSY → ATL Jul 22, 15:39 UTCJul 22, 18:13 UTC2h 34m
2026-07-22 DAL2536 MSP → PHL Jul 22, 11:15 UTCJul 22, 13:55 UTC2h 40m
2026-07-22 DAL2536 MSP → PHL Jul 22, 11:10 UTCJul 22, 13:53 UTC2h 43m
2026-07-22 DAL716 BOS → ATL Jul 22, 00:05 UTCJul 22, 03:15 UTC3h 10m
2026-07-21 DAL751 LGA → DEN Jul 21, 12:00 UTCJul 21, 15:50 UTC3h 50m
2026-07-20 DAL716 BOS → ATL Jul 20, 23:35 UTCJul 21, 02:45 UTC3h 10m
2026-07-20 DAL716 BOS → ATL Jul 20, 18:10 UTCJul 20, 21:45 UTC3h 35m
2026-07-20 DAL398 DEN → LGA Jul 20, 13:30 UTCJul 20, 16:40 UTC3h 10m
2026-07-20 DAL398 DEN → LGA Jul 20, 13:29 UTCJul 20, 16:39 UTC3h 10m
2026-07-19 DAL457 JFK → DEN Jul 19, 21:40 UTCJul 20, 01:15 UTC3h 35m
2026-07-16 DAL9965 LGA → JFK Jul 16, 16:49 UTCJul 16, 17:05 UTC15m
2026-07-16 DAL2239 - Jul 16, 14:35 UTCJul 16, 15:25 UTC50m
2026-07-15 DAL2239 - Jul 15, 20:10 UTCJul 15, 21:50 UTC1h 40m
2026-07-15 DAL2239 ORD → PIT Jul 15, 20:07 UTCJul 15, 21:50 UTC1h 43m
2026-07-15 DAL2055 SEA → ORD Jul 15, 14:56 UTCJul 15, 18:21 UTC3h 25m
2026-07-15 DAL2055 SEA → ORD Jul 15, 15:00 UTCJul 15, 18:30 UTC3h 30m
2026-07-15 DAL2613 - Jul 15, 02:35 UTCJul 15, 04:40 UTC2h 5m
2026-07-14 DAL2613 SEA → SAN Jul 14, 22:25 UTCJul 15, 01:00 UTC2h 34m
2026-07-14 DAL2508 - Jul 14, 18:25 UTCJul 14, 20:30 UTC2h 5m
2026-07-14 DAL2508 SAN → SEA Jul 14, 18:22 UTCJul 14, 20:37 UTC2h 15m
2026-07-14 DAL2508 SEA → SAN Jul 14, 14:20 UTCJul 14, 17:00 UTC2h 40m
2026-07-14 DAL2998 SLC → SEA Jul 14, 05:05 UTCJul 14, 06:35 UTC1h 30m
2026-07-14 DAL2149 - Jul 14, 00:40 UTCJul 14, 03:35 UTC2h 55m
2026-07-13 DAL2149 SLC → CVG Jul 13, 19:45 UTCJul 13, 22:55 UTC3h 10m
2026-07-13 DAL1447 - Jul 13, 17:00 UTCJul 13, 18:05 UTC1h 5m
2026-07-13 DAL1447 - Jul 13, 14:20 UTCJul 13, 15:30 UTC1h 10m
2026-07-13 DAL1590 LAS → SLC Jul 13, 03:01 UTCJul 13, 03:55 UTC55m
2026-07-12 DAL2955 SEA → LAS Jul 12, 23:30 UTCJul 13, 01:40 UTC2h 10m
2026-07-12 DAL2419 PHX → SEA Jul 12, 19:30 UTCJul 12, 21:55 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 N394DA page for operator, model, and routing details .

Mode-S A491F1 frequently asked

What is Mode-S code A491F1?
A491F1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N394DA.
Where is Mode-S A491F1 registered?
Mode-S code A491F1 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 A491F1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A491F1, octal 51110761, decimal 10,785,265.
What flights does A491F1 operate?
Mode-S A491F1 has broadcast 20 distinct callsigns, including DAL2905, DAL716, DAL2419, DAL2267, DAL2880.