Apparatus

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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
Broadcasting now · callsign DAL2149 · 10,875 ft
Flights observed
434
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A491F1 is currently broadcasting. Map zoomed to live position.

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
DAL2419 - 12 2026-07-12
DAL2267 Delta Air Lines 10 2026-05-17
DAL716 Delta Air Lines 9 2026-06-20
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
DAL306 Delta Air Lines 6 2026-05-16
DAL2980 - 6 2026-07-10
DAL2259 Delta Air Lines 6 2026-05-14
DAL2196 - 6 2026-06-22
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
DAL760 - 5 2026-06-23
DAL2830 Delta Air Lines 5 2026-05-10
DAL2444 Delta Air Lines 5 2026-05-07
DAL2041 Delta Air Lines 5 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2149 - Jul 14, 00:40 UTCJul 14, 02:15 UTC1h 35m
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
2026-07-12 DAL2419 SEA → PHX Jul 12, 15:45 UTCJul 12, 18:15 UTC2h 30m
2026-07-12 DAL2616 - Jul 12, 04:25 UTCJul 12, 06:20 UTC1h 55m
2026-07-12 DAL2616 LAX → SEA Jul 12, 04:24 UTCJul 12, 06:20 UTC1h 56m
2026-07-12 DAL2861 SEA → LAX Jul 12, 01:05 UTCJul 12, 03:30 UTC2h 25m
2026-07-12 DAL2861 SEA → LAX Jul 12, 01:05 UTCJul 12, 03:26 UTC2h 21m
2026-07-11 DAL2817 SLC → SEA Jul 11, 21:30 UTCJul 11, 23:10 UTC1h 40m
2026-07-11 DAL1265 SEA → SLC Jul 11, 18:35 UTCJul 11, 20:10 UTC1h 35m
2026-07-11 DAL1570 PHX → SEA Jul 11, 14:05 UTCJul 11, 16:35 UTC2h 30m
2026-07-11 DAL2698 - Jul 11, 01:40 UTCJul 11, 04:05 UTC2h 25m
2026-07-10 DAL2880 LAS → SEA Jul 10, 22:14 UTCJul 11, 00:18 UTC2h 4m
2026-07-10 DAL2880 LAS → SEA Jul 10, 22:15 UTCJul 11, 00:15 UTC2h 0m
2026-07-10 DAL2880 SEA → LAS Jul 10, 18:25 UTCJul 10, 20:25 UTC2h 0m
2026-07-10 DAL2980 LAX → SEA Jul 10, 14:25 UTCJul 10, 16:40 UTC2h 15m
2026-07-10 DAL2980 LAX → SEA Jul 10, 14:24 UTCJul 10, 16:36 UTC2h 12m
2026-07-10 DAL2298 - Jul 10, 00:05 UTCJul 10, 03:55 UTC3h 50m
2026-07-09 DAL2368 - Jul 9, 18:30 UTCJul 9, 22:00 UTC3h 30m
2026-07-09 DAL2085 MSY → LAX Jul 9, 13:15 UTCJul 9, 16:40 UTC3h 25m
2026-07-09 DAL2085 MSY → LAX Jul 9, 13:15 UTCJul 9, 16:38 UTC3h 23m
2026-07-08 DAL2154 - Jul 8, 23:15 UTCJul 9, 02:35 UTC3h 20m
2026-07-08 DAL1696 LAS → LAX Jul 8, 20:20 UTCJul 8, 21:20 UTC1h 0m
2026-07-08 DAL1696 - Jul 8, 18:15 UTCJul 8, 18:55 UTC40m
2026-07-08 DAL1556 - Jul 8, 12:50 UTCJul 8, 16:25 UTC3h 35m
2026-07-07 DAL2377 SLC → ORD Jul 7, 21:50 UTCJul 8, 00:35 UTC2h 45m
2026-07-07 DAL9965 - Jul 7, 17:10 UTCJul 7, 20:25 UTC3h 15m
2026-07-07 DAL2291 - Jul 7, 00:10 UTCJul 7, 03:15 UTC3h 5m
2026-07-06 DAL1593 BNA → SLC Jul 6, 19:50 UTCJul 6, 22:45 UTC2h 55m
2026-07-06 DAL2214 SLC → BNA Jul 6, 15:30 UTCJul 6, 18:20 UTC2h 50m
2026-07-06 DAL2214 SLC → BNA Jul 6, 15:28 UTCJul 6, 18:22 UTC2h 54m
2026-07-04 DAL1838 PVR → SLC Jul 4, 22:45 UTCJul 5, 00:40 UTC1h 55m
2026-07-04 DAL1948 SLC → PVR Jul 4, 16:50 UTCJul 4, 18:15 UTC1h 25m
2026-07-04 DAL1948 SLC → PVR Jul 4, 16:50 UTCJul 4, 19:46 UTC2h 56m
2026-07-04 DAL2142 - Jul 4, 11:40 UTCJul 4, 14:55 UTC3h 15m
2026-07-04 DAL2142 CMH → SLC Jul 4, 11:36 UTCJul 4, 14:51 UTC3h 15m
2026-07-04 DAL1459 ATL → CMH Jul 4, 02:35 UTCJul 4, 03:45 UTC1h 10m
2026-07-04 DAL1459 ATL → CMH Jul 4, 02:35 UTCJul 4, 03:42 UTC1h 7m
2026-07-03 DAL1758 PTY → ATL Jul 3, 19:33 UTCJul 3, 23:19 UTC3h 46m
2026-07-03 DAL1759 ATL → ATL Jul 3, 14:30 UTCJul 3, 23:15 UTC8h 45m
2026-07-03 DAL1184 - Jul 3, 11:05 UTCJul 3, 12:45 UTC1h 40m
2026-07-03 DAL2423 ATL → OKC Jul 3, 02:55 UTCJul 3, 04:50 UTC1h 55m
2026-07-02 DAL2740 DEN → SEA Jul 2, 23:55 UTCJul 3, 01:25 UTC1h 30m
2026-07-02 DAL2738 ATL → ORD Jul 2, 20:15 UTCJul 2, 21:40 UTC1h 25m
2026-07-02 DAL1841 KIN → ATL Jul 2, 15:05 UTCJul 2, 16:45 UTC1h 40m
2026-07-02 DAL1841 KIN → ATL Jul 2, 14:08 UTCJul 2, 16:42 UTC2h 34m

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?
Yes. Mode-S A491F1 is currently airborne.
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, DAL2419, DAL2267, DAL716, DAL2880.